[krb5.git] / src / include / k5-int.h

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * Copyright (C) 1989,1990,1991,1992,1993,1994,1995,2000,2001, 2003,2006,2007,2008,2009 by the Massachusetts Institute of Technology,
 * Cambridge, MA, USA.  All Rights Reserved.
 *
 * This software is being provided to you, the LICENSEE, by the
 * Massachusetts Institute of Technology (M.I.T.) under the following
 * license.  By obtaining, using and/or copying this software, you agree
 * that you have read, understood, and will comply with these terms and
 * conditions:
 *
 * Export of this software from the United States of America may
 * require a specific license from the United States Government.
 * It is the responsibility of any person or organization contemplating
 * export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify and distribute
 * this software and its documentation for any purpose and without fee or
 * royalty is hereby granted, provided that you agree to comply with the
 * following copyright notice and statements, including the disclaimer, and
 * that the same appear on ALL copies of the software and documentation,
 * including modifications that you make for internal use or for
 * distribution:
 *
 * THIS SOFTWARE IS PROVIDED "AS IS", AND M.I.T. MAKES NO REPRESENTATIONS
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 * THE LICENSED SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
 * PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
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 * Furthermore if you modify this software you must label
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/*
 * Copyright (C) 1998 by the FundsXpress, INC.
 *
 * All rights reserved.
 *
 * Export of this software from the United States of America may require
 * a specific license from the United States Government.  It is the
 * responsibility of any person or organization contemplating export to
 * obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of FundsXpress. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  FundsXpress makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

/*
 * This prototype for k5-int.h (Krb5 internals include file)
 * includes the user-visible definitions from krb5.h and then
 * includes other definitions that are not user-visible but are
 * required for compiling Kerberos internal routines.
 *
 * John Gilmore, Cygnus Support, Sat Jan 21 22:45:52 PST 1995
 */

#ifndef _KRB5_INT_H
#define _KRB5_INT_H

#ifdef KRB5_GENERAL__
#error krb5.h included before k5-int.h
#endif /* KRB5_GENERAL__ */

#include "osconf.h"

#if defined(__MACH__) && defined(__APPLE__)
#       include <TargetConditionals.h>
#    if TARGET_RT_MAC_CFM
#       error "Use KfM 4.0 SDK headers for CFM compilation."
#    endif
#endif

/*
 * Begin "k5-config.h"
 */
#ifndef KRB5_CONFIG__
#define KRB5_CONFIG__

/*
 * Machine-type definitions: PC Clone 386 running Microloss Windows
 */

#if defined(_MSDOS) || defined(_WIN32)
#include "win-mac.h"

/* Kerberos Windows initialization file */
#define KERBEROS_INI    "kerberos.ini"
#define INI_FILES       "Files"
#define INI_KRB_CCACHE  "krb5cc"        /* Location of the ccache */
#define INI_KRB5_CONF   "krb5.ini"      /* Location of krb5.conf file */
#define ANSI_STDIO
#define DISABLE_TRACING
#endif

#include "autoconf.h"

#ifndef KRB5_SYSTYPES__
#define KRB5_SYSTYPES__

#ifdef HAVE_SYS_TYPES_H         /* From autoconf.h */
#include <sys/types.h>
#else /* HAVE_SYS_TYPES_H */
typedef unsigned long   u_long;
typedef unsigned int    u_int;
typedef unsigned short  u_short;
typedef unsigned char   u_char;
#endif /* HAVE_SYS_TYPES_H */
#endif /* KRB5_SYSTYPES__ */


#include "k5-platform.h"
#include "k5-trace.h"
/* not used in krb5.h (yet) */
typedef UINT64_TYPE krb5_ui_8;
typedef INT64_TYPE krb5_int64;


#define DEFAULT_PWD_STRING1 "Enter password"
#define DEFAULT_PWD_STRING2 "Re-enter password for verification"

#define KRB5_KDB_MAX_LIFE       (60*60*24) /* one day */
#define KRB5_KDB_MAX_RLIFE      (60*60*24*7) /* one week */
#define KRB5_KDB_EXPIRATION     2145830400 /* Thu Jan  1 00:00:00 2038 UTC */

/*
 * Windows requires a different api interface to each function. Here
 * just define it as NULL.
 */
#ifndef KRB5_CALLCONV
#define KRB5_CALLCONV
#define KRB5_CALLCONV_C
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif

/* #define KRB5_OLD_CRYPTO is done in krb5.h */

#endif /* KRB5_CONFIG__ */

/*
 * End "k5-config.h"
 */

/*
 * After loading the configuration definitions, load the Kerberos definitions.
 */
#include <errno.h>
#include "krb5.h"
#include <krb5/plugin.h>
#include "profile.h"

#include "port-sockets.h"
#include "socket-utils.h"

/* Get mutex support; currently used only for the replay cache.  */
#include "k5-thread.h"

/* Get error info support.  */
#include "k5-err.h"

/* Get string buffer support. */
#include "k5-buf.h"

/* cofiguration variables */
#define KRB5_CONF_ACL_FILE                       "acl_file"
#define KRB5_CONF_ADMIN_KEYTAB                   "admin_keytab"
#define KRB5_CONF_ADMIN_SERVER                   "admin_server"
#define KRB5_CONF_ALLOW_WEAK_CRYPTO              "allow_weak_crypto"
#define KRB5_CONF_AP_REQ_CHECKSUM_TYPE           "ap_req_checksum_type"
#define KRB5_CONF_AUTH_TO_LOCAL                  "auth_to_local"
#define KRB5_CONF_AUTH_TO_LOCAL_NAMES            "auth_to_local_names"
#define KRB5_CONF_CANONICALIZE                   "canonicalize"
#define KRB5_CONF_CCACHE_TYPE                    "ccache_type"
#define KRB5_CONF_CLOCKSKEW                      "clockskew"
#define KRB5_CONF_DATABASE_NAME                  "database_name"
#define KRB5_CONF_DB_MODULE_DIR                  "db_module_dir"
#define KRB5_CONF_DB_MODULES                     "db_modules"
#define KRB5_CONF_DEFAULT                        "default"
#define KRB5_CONF_DEFAULT_REALM                  "default_realm"
#define KRB5_CONF_DEFAULT_DOMAIN                 "default_domain"
#define KRB5_CONF_DEFAULT_TKT_ENCTYPES           "default_tkt_enctypes"
#define KRB5_CONF_DEFAULT_TGS_ENCTYPES           "default_tgs_enctypes"
#define KRB5_CONF_DEFAULT_KEYTAB_NAME            "default_keytab_name"
#define KRB5_CONF_DEFAULT_PRINCIPAL_EXPIRATION   "default_principal_expiration"
#define KRB5_CONF_DEFAULT_PRINCIPAL_FLAGS        "default_principal_flags"
#define KRB5_CONF_DICT_FILE                   "dict_file"
#define KRB5_CONF_DISABLE                     "disable"
#define KRB5_CONF_DISABLE_LAST_SUCCESS        "disable_last_success"
#define KRB5_CONF_DISABLE_LOCKOUT             "disable_lockout"
#define KRB5_CONF_DNS_LOOKUP_KDC              "dns_lookup_kdc"
#define KRB5_CONF_DNS_LOOKUP_REALM            "dns_lookup_realm"
#define KRB5_CONF_DNS_FALLBACK                "dns_fallback"
#define KRB5_CONF_DOMAIN_REALM                "domain_realm"
#define KRB5_CONF_ENABLE_ONLY                 "enable_only"
#define KRB5_CONF_EXTRA_ADDRESSES             "extra_addresses"
#define KRB5_CONF_FORWARDABLE                 "forwardable"
#define KRB5_CONF_HOST_BASED_SERVICES         "host_based_services"
#define KRB5_CONF_IPROP_ENABLE                "iprop_enable"
#define KRB5_CONF_IPROP_MASTER_ULOGSIZE       "iprop_master_ulogsize"
#define KRB5_CONF_IPROP_PORT                  "iprop_port"
#define KRB5_CONF_IPROP_SLAVE_POLL            "iprop_slave_poll"
#define KRB5_CONF_IPROP_LOGFILE               "iprop_logfile"
#define KRB5_CONF_K5LOGIN_AUTHORITATIVE       "k5login_authoritative"
#define KRB5_CONF_K5LOGIN_DIRECTORY           "k5login_directory"
#define KRB5_CONF_KADMIND_PORT                "kadmind_port"
#define KRB5_CONF_KRB524_SERVER               "krb524_server"
#define KRB5_CONF_KDC                         "kdc"
#define KRB5_CONF_KDCDEFAULTS                 "kdcdefaults"
#define KRB5_CONF_KDC_PORTS                   "kdc_ports"
#define KRB5_CONF_KDC_TCP_PORTS               "kdc_tcp_ports"
#define KRB5_CONF_MAX_DGRAM_REPLY_SIZE        "kdc_max_dgram_reply_size"
#define KRB5_CONF_KDC_DEFAULT_OPTIONS         "kdc_default_options"
#define KRB5_CONF_KDC_TIMESYNC                "kdc_timesync"
#define KRB5_CONF_KDC_REQ_CHECKSUM_TYPE       "kdc_req_checksum_type"
#define KRB5_CONF_KEY_STASH_FILE              "key_stash_file"
#define KRB5_CONF_KPASSWD_PORT                "kpasswd_port"
#define KRB5_CONF_KPASSWD_SERVER              "kpasswd_server"
#define KRB5_CONF_LDAP_KDC_DN                 "ldap_kdc_dn"
#define KRB5_CONF_LDAP_KADMIN_DN              "ldap_kadmind_dn"
#define KRB5_CONF_LDAP_SERVICE_PASSWORD_FILE  "ldap_service_password_file"
#define KRB5_CONF_LDAP_ROOT_CERTIFICATE_FILE  "ldap_root_certificate_file"
#define KRB5_CONF_LDAP_SERVERS                "ldap_servers"
#define KRB5_CONF_LDAP_CONNS_PER_SERVER       "ldap_conns_per_server"
#define KRB5_CONF_LIBDEFAULTS                 "libdefaults"
#define KRB5_CONF_LOGGING                     "logging"
#define KRB5_CONF_MASTER_KEY_NAME             "master_key_name"
#define KRB5_CONF_MASTER_KEY_TYPE             "master_key_type"
#define KRB5_CONF_MASTER_KDC                  "master_kdc"
#define KRB5_CONF_MAX_LIFE                    "max_life"
#define KRB5_CONF_MAX_RENEWABLE_LIFE          "max_renewable_life"
#define KRB5_CONF_MODULE                      "module"
#define KRB5_CONF_NOADDRESSES                 "noaddresses"
#define KRB5_CONF_NO_HOST_REFERRAL            "no_host_referral"
#define KRB5_CONF_PERMITTED_ENCTYPES          "permitted_enctypes"
#define KRB5_CONF_PLUGINS                     "plugins"
#define KRB5_CONF_PREAUTH_MODULE_DIR          "preauth_module_dir"
#define KRB5_CONF_PREFERRED_PREAUTH_TYPES     "preferred_preauth_types"
#define KRB5_CONF_PROXIABLE                   "proxiable"
#define KRB5_CONF_RDNS                        "rdns"
#define KRB5_CONF_REALMS                      "realms"
#define KRB5_CONF_REALM_TRY_DOMAINS           "realm_try_domains"
#define KRB5_CONF_REJECT_BAD_TRANSIT          "reject_bad_transit"
#define KRB5_CONF_RENEW_LIFETIME              "renew_lifetime"
#define KRB5_CONF_RESTRICT_ANONYMOUS_TO_TGT   "restrict_anonymous_to_tgt"
#define KRB5_CONF_SAFE_CHECKSUM_TYPE          "safe_checksum_type"
#define KRB5_CONF_SUPPORTED_ENCTYPES          "supported_enctypes"
#define KRB5_CONF_TICKET_LIFETIME             "ticket_lifetime"
#define KRB5_CONF_UDP_PREFERENCE_LIMIT        "udp_preference_limit"
#define KRB5_CONF_VERIFY_AP_REQ_NOFAIL        "verify_ap_req_nofail"
#define KRB5_CONF_V4_INSTANCE_CONVERT         "v4_instance_convert"
#define KRB5_CONF_V4_REALM                    "v4_realm"
#define KRB5_CONF_ASTERISK                    "*"
#define KRB5_CONF_FAST_AVAIL                  "fast_avail"

/* Error codes used in KRB_ERROR protocol messages.
   Return values of library routines are based on a different error table
   (which allows non-ambiguous error codes between subsystems) */

/* KDC errors */
#define KDC_ERR_NONE                    0 /* No error */
#define KDC_ERR_NAME_EXP                1 /* Client's entry in DB expired */
#define KDC_ERR_SERVICE_EXP             2 /* Server's entry in DB expired */
#define KDC_ERR_BAD_PVNO                3 /* Requested pvno not supported */
#define KDC_ERR_C_OLD_MAST_KVNO         4 /* C's key encrypted in old master */
#define KDC_ERR_S_OLD_MAST_KVNO         5 /* S's key encrypted in old master */
#define KDC_ERR_C_PRINCIPAL_UNKNOWN     6 /* Client not found in Kerberos DB */
#define KDC_ERR_S_PRINCIPAL_UNKNOWN     7 /* Server not found in Kerberos DB */
#define KDC_ERR_PRINCIPAL_NOT_UNIQUE    8 /* Multiple entries in Kerberos DB */
#define KDC_ERR_NULL_KEY                9 /* The C or S has a null key */
#define KDC_ERR_CANNOT_POSTDATE         10 /* Tkt ineligible for postdating */
#define KDC_ERR_NEVER_VALID             11 /* Requested starttime > endtime */
#define KDC_ERR_POLICY                  12 /* KDC policy rejects request */
#define KDC_ERR_BADOPTION               13 /* KDC can't do requested opt. */
#define KDC_ERR_ENCTYPE_NOSUPP          14 /* No support for encryption type */
#define KDC_ERR_SUMTYPE_NOSUPP          15 /* No support for checksum type */
#define KDC_ERR_PADATA_TYPE_NOSUPP      16 /* No support for padata type */
#define KDC_ERR_TRTYPE_NOSUPP           17 /* No support for transited type */
#define KDC_ERR_CLIENT_REVOKED          18 /* C's creds have been revoked */
#define KDC_ERR_SERVICE_REVOKED         19 /* S's creds have been revoked */
#define KDC_ERR_TGT_REVOKED             20 /* TGT has been revoked */
#define KDC_ERR_CLIENT_NOTYET           21 /* C not yet valid */
#define KDC_ERR_SERVICE_NOTYET          22 /* S not yet valid */
#define KDC_ERR_KEY_EXP                 23 /* Password has expired */
#define KDC_ERR_PREAUTH_FAILED          24 /* Preauthentication failed */
#define KDC_ERR_PREAUTH_REQUIRED        25 /* Additional preauthentication */
                                           /* required */
#define KDC_ERR_SERVER_NOMATCH          26 /* Requested server and */
                                           /* ticket don't match*/
#define KDC_ERR_MUST_USE_USER2USER      27 /* Server principal valid for */
                                           /*   user2user only */
#define KDC_ERR_PATH_NOT_ACCEPTED       28 /* KDC policy rejected transited */
                                           /*   path */
#define KDC_ERR_SVC_UNAVAILABLE         29 /* A service is not
                                            * available that is
                                            * required to process the
                                            * request */
/* Application errors */
#define KRB_AP_ERR_BAD_INTEGRITY 31     /* Decrypt integrity check failed */
#define KRB_AP_ERR_TKT_EXPIRED  32      /* Ticket expired */
#define KRB_AP_ERR_TKT_NYV      33      /* Ticket not yet valid */
#define KRB_AP_ERR_REPEAT       34      /* Request is a replay */
#define KRB_AP_ERR_NOT_US       35      /* The ticket isn't for us */
#define KRB_AP_ERR_BADMATCH     36      /* Ticket/authenticator don't match */
#define KRB_AP_ERR_SKEW         37      /* Clock skew too great */
#define KRB_AP_ERR_BADADDR      38      /* Incorrect net address */
#define KRB_AP_ERR_BADVERSION   39      /* Protocol version mismatch */
#define KRB_AP_ERR_MSG_TYPE     40      /* Invalid message type */
#define KRB_AP_ERR_MODIFIED     41      /* Message stream modified */
#define KRB_AP_ERR_BADORDER     42      /* Message out of order */
#define KRB_AP_ERR_BADKEYVER    44      /* Key version is not available */
#define KRB_AP_ERR_NOKEY        45      /* Service key not available */
#define KRB_AP_ERR_MUT_FAIL     46      /* Mutual authentication failed */
#define KRB_AP_ERR_BADDIRECTION 47      /* Incorrect message direction */
#define KRB_AP_ERR_METHOD       48      /* Alternative authentication */
                                        /* method required */
#define KRB_AP_ERR_BADSEQ       49      /* Incorrect sequence numnber */
                                        /* in message */
#define KRB_AP_ERR_INAPP_CKSUM  50      /* Inappropriate type of */
                                        /* checksum in message */
#define KRB_AP_PATH_NOT_ACCEPTED 51     /* Policy rejects transited path */
#define KRB_ERR_RESPONSE_TOO_BIG 52     /* Response too big for UDP, */
                                        /*   retry with TCP */

/* other errors */
#define KRB_ERR_GENERIC         60      /* Generic error (description */
                                        /* in e-text) */
#define KRB_ERR_FIELD_TOOLONG   61      /* Field is too long for impl. */

/* PKINIT server-reported errors */
#define KDC_ERR_CLIENT_NOT_TRUSTED              62 /* client cert not trusted */
#define KDC_ERR_KDC_NOT_TRUSTED                 63
#define KDC_ERR_INVALID_SIG                     64 /* client signature verify failed */
#define KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED  65 /* invalid Diffie-Hellman parameters */
#define KDC_ERR_CERTIFICATE_MISMATCH            66
#define KRB_AP_ERR_NO_TGT                       67
#define KDC_ERR_WRONG_REALM                     68
#define KRB_AP_ERR_USER_TO_USER_REQUIRED        69
#define KDC_ERR_CANT_VERIFY_CERTIFICATE         70 /* client cert not verifiable to */
                                                   /* trusted root cert */
#define KDC_ERR_INVALID_CERTIFICATE             71 /* client cert had invalid signature */
#define KDC_ERR_REVOKED_CERTIFICATE             72 /* client cert was revoked */
#define KDC_ERR_REVOCATION_STATUS_UNKNOWN       73 /* client cert revoked, reason unknown */
#define KDC_ERR_REVOCATION_STATUS_UNAVAILABLE   74
#define KDC_ERR_CLIENT_NAME_MISMATCH            75 /* mismatch between client cert and */
                                                   /* principal name */
#define KDC_ERR_INCONSISTENT_KEY_PURPOSE        77 /* bad extended key use */
#define KDC_ERR_DIGEST_IN_CERT_NOT_ACCEPTED     78 /* bad digest algorithm in client cert */
#define KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED    79 /* missing paChecksum in PA-PK-AS-REQ */
#define KDC_ERR_DIGEST_IN_SIGNED_DATA_NOT_ACCEPTED 80 /* bad digest algorithm in SignedData */
#define KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED 81
#define KRB_AP_ERR_IAKERB_KDC_NOT_FOUND         85 /* The IAKERB proxy could
not find a KDC */
#define KRB_AP_ERR_IAKERB_KDC_NO_RESPONSE       86 /* The KDC did not respond
to the IAKERB proxy */

/*
 * This structure is returned in the e-data field of the KRB-ERROR
 * message when the error calling for an alternative form of
 * authentication is returned, KRB_AP_METHOD.
 */
typedef struct _krb5_alt_method {
    krb5_magic      magic;
    krb5_int32      method;
    unsigned int    length;
    krb5_octet      *data;
} krb5_alt_method;

/*
 * A null-terminated array of this structure is returned by the KDC as
 * the data part of the ETYPE_INFO preauth type.  It informs the
 * client which encryption types are supported.
 * The  same data structure is used by both etype-info and etype-info2
 * but s2kparams must be null when encoding etype-info.
 */
typedef struct _krb5_etype_info_entry {
    krb5_magic      magic;
    krb5_enctype    etype;
    unsigned int    length;
    krb5_octet      *salt;
    krb5_data s2kparams;
} krb5_etype_info_entry;

/*
 *  This is essentially -1 without sign extension which can screw up
 *  comparisons on 64 bit machines. If the length is this value, then
 *  the salt data is not present. This is to distinguish between not
 *  being set and being of 0 length.
 */
#define KRB5_ETYPE_NO_SALT VALID_UINT_BITS

typedef krb5_etype_info_entry ** krb5_etype_info;

/* RFC 4537 */
typedef struct _krb5_etype_list {
    int             length;
    krb5_enctype    *etypes;
} krb5_etype_list;

/*
 * a sam_challenge is returned for alternate preauth
 */
/*
  SAMFlags ::= BIT STRING {
  use-sad-as-key[0],
  send-encrypted-sad[1],
  must-pk-encrypt-sad[2]
  }
*/
/*
  PA-SAM-CHALLENGE ::= SEQUENCE {
  sam-type[0]                 INTEGER,
  sam-flags[1]                SAMFlags,
  sam-type-name[2]            GeneralString OPTIONAL,
  sam-track-id[3]             GeneralString OPTIONAL,
  sam-challenge-label[4]      GeneralString OPTIONAL,
  sam-challenge[5]            GeneralString OPTIONAL,
  sam-response-prompt[6]      GeneralString OPTIONAL,
  sam-pk-for-sad[7]           EncryptionKey OPTIONAL,
  sam-nonce[8]                INTEGER OPTIONAL,
  sam-cksum[9]                Checksum OPTIONAL
  }
*/
/* sam_type values -- informational only */
#define PA_SAM_TYPE_ENIGMA     1   /*  Enigma Logic */
#define PA_SAM_TYPE_DIGI_PATH  2   /*  Digital Pathways */
#define PA_SAM_TYPE_SKEY_K0    3   /*  S/key where  KDC has key 0 */
#define PA_SAM_TYPE_SKEY       4   /*  Traditional S/Key */
#define PA_SAM_TYPE_SECURID    5   /*  Security Dynamics */
#define PA_SAM_TYPE_CRYPTOCARD 6   /*  CRYPTOCard */
#if 1 /* XXX need to figure out who has which numbers assigned */
#define PA_SAM_TYPE_ACTIVCARD_DEC  6   /*  ActivCard decimal mode */
#define PA_SAM_TYPE_ACTIVCARD_HEX  7   /*  ActivCard hex mode */
#define PA_SAM_TYPE_DIGI_PATH_HEX  8   /*  Digital Pathways hex mode */
#endif
#define PA_SAM_TYPE_EXP_BASE    128 /* experimental */
#define PA_SAM_TYPE_GRAIL               (PA_SAM_TYPE_EXP_BASE+0) /* testing */
#define PA_SAM_TYPE_SECURID_PREDICT     (PA_SAM_TYPE_EXP_BASE+1) /* special */

typedef struct _krb5_predicted_sam_response {
    krb5_magic      magic;
    krb5_keyblock   sam_key;
    krb5_flags      sam_flags; /* Makes key munging easier */
    krb5_timestamp  stime;  /* time on server, for replay detection */
    krb5_int32      susec;
    krb5_principal  client;
    krb5_data       msd;    /* mechanism specific data */
} krb5_predicted_sam_response;

typedef struct _krb5_sam_challenge {
    krb5_magic      magic;
    krb5_int32      sam_type; /* information */
    krb5_flags      sam_flags; /* KRB5_SAM_* values */
    krb5_data       sam_type_name;
    krb5_data       sam_track_id;
    krb5_data       sam_challenge_label;
    krb5_data       sam_challenge;
    krb5_data       sam_response_prompt;
    krb5_data       sam_pk_for_sad;
    krb5_int32      sam_nonce;
    krb5_checksum   sam_cksum;
} krb5_sam_challenge;

typedef struct _krb5_sam_key {  /* reserved for future use */
    krb5_magic      magic;
    krb5_keyblock   sam_key;
} krb5_sam_key;

typedef struct _krb5_enc_sam_response_enc {
    krb5_magic      magic;
    krb5_int32      sam_nonce;
    krb5_timestamp  sam_timestamp;
    krb5_int32      sam_usec;
    krb5_data       sam_sad;
} krb5_enc_sam_response_enc;

typedef struct _krb5_sam_response {
    krb5_magic      magic;
    krb5_int32      sam_type; /* informational */
    krb5_flags      sam_flags; /* KRB5_SAM_* values */
    krb5_data       sam_track_id; /* copied */
    krb5_enc_data   sam_enc_key; /* krb5_sam_key - future use */
    krb5_enc_data   sam_enc_nonce_or_ts; /* krb5_enc_sam_response_enc */
    krb5_int32      sam_nonce;
    krb5_timestamp  sam_patimestamp;
} krb5_sam_response;

typedef struct _krb5_sam_challenge_2 {
    krb5_data       sam_challenge_2_body;
    krb5_checksum   **sam_cksum;            /* Array of checksums */
} krb5_sam_challenge_2;

typedef struct _krb5_sam_challenge_2_body {
    krb5_magic      magic;
    krb5_int32      sam_type; /* information */
    krb5_flags      sam_flags; /* KRB5_SAM_* values */
    krb5_data       sam_type_name;
    krb5_data       sam_track_id;
    krb5_data       sam_challenge_label;
    krb5_data       sam_challenge;
    krb5_data       sam_response_prompt;
    krb5_data       sam_pk_for_sad;
    krb5_int32      sam_nonce;
    krb5_enctype    sam_etype;
} krb5_sam_challenge_2_body;

typedef struct _krb5_sam_response_2 {
    krb5_magic      magic;
    krb5_int32      sam_type; /* informational */
    krb5_flags      sam_flags; /* KRB5_SAM_* values */
    krb5_data       sam_track_id; /* copied */
    krb5_enc_data   sam_enc_nonce_or_sad; /* krb5_enc_sam_response_enc */
    krb5_int32      sam_nonce;
} krb5_sam_response_2;

typedef struct _krb5_enc_sam_response_enc_2 {
    krb5_magic      magic;
    krb5_int32      sam_nonce;
    krb5_data       sam_sad;
} krb5_enc_sam_response_enc_2;

/*
 * Keep the pkinit definitions in a separate file so that the plugin
 * only has to include k5-int-pkinit.h rather than k5-int.h
 */

#include "k5-int-pkinit.h"

#include <stdlib.h>
#include <string.h>

#ifndef HAVE_STRDUP
extern char *strdup (const char *);
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#ifdef TIME_WITH_SYS_TIME
#include <time.h>
#endif
#else
#include <time.h>
#endif

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>                   /* struct stat, stat() */
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>                  /* MAXPATHLEN */
#endif

#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>                   /* prototypes for file-related
                                           syscalls; flags for open &
                                           friends */
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#include <stdio.h>

#include "k5-gmt_mktime.h"

struct addrlist;
struct sendto_callback_info;

/* libos.spec */
krb5_error_code krb5_lock_file(krb5_context, int, int);
krb5_error_code krb5_unlock_file(krb5_context, int);
krb5_error_code krb5_sendto_kdc(krb5_context, const krb5_data *,
                                const krb5_data *, krb5_data *, int *, int);

krb5_error_code krb5_get_krbhst(krb5_context, const krb5_data *, char *** );
krb5_error_code krb5_free_krbhst(krb5_context, char * const * );
krb5_error_code krb5_create_secure_file(krb5_context, const char * pathname);
krb5_error_code krb5_sync_disk_file(krb5_context, FILE *fp);

krb5_error_code krb5int_init_context_kdc(krb5_context *);

krb5_error_code krb5_os_init_context(krb5_context, krb5_boolean);

void krb5_os_free_context(krb5_context);

/* This function is needed by KfM's KerberosPreferences API
 * because it needs to be able to specify "secure" */
krb5_error_code
os_get_default_config_files(profile_filespec_t **pfiles, krb5_boolean secure);

krb5_error_code
krb5_os_hostaddr(krb5_context, const char *, krb5_address ***);

krb5_error_code
krb5int_get_domain_realm_mapping(krb5_context , const char *, char ***);

/* N.B.: You need to include fake-addrinfo.h *before* k5-int.h if you're
   going to use this structure.  */
struct addrlist {
    struct {
#ifdef FAI_DEFINED
        struct addrinfo *ai;
#else
        struct undefined_addrinfo *ai;
#endif
        void (*freefn)(void *);
        void *data;
    } *addrs;
    size_t naddrs;
    size_t space;
};
#define ADDRLIST_INIT { 0, 0, 0 }
extern void krb5int_free_addrlist(struct addrlist *);
extern int krb5int_grow_addrlist(struct addrlist *, int);
extern int krb5int_add_host_to_list(struct addrlist *, const char *,
                                    int, int, int, int);

#include <krb5/locate_plugin.h>
krb5_error_code
krb5int_locate_server(krb5_context, const krb5_data *realm,
                      struct addrlist *, enum locate_service_type svc,
                      int sockettype, int family);

struct derived_key {
    krb5_data constant;
    krb5_key dkey;
    struct derived_key *next;
};

/* Internal structure of an opaque key identifier */
struct krb5_key_st {
    krb5_keyblock keyblock;
    int refcount;
    struct derived_key *derived;
    /*
     * Cache of data private to the cipher implementation, which we
     * don't want to have to recompute for every operation.  This may
     * include key schedules, iteration counts, etc.
     *
     * The cipher implementation is responsible for setting this up
     * whenever needed, and the enc_provider key_cleanup method must
     * then be provided to dispose of it.
     */
    void *cache;
};

/* new encryption provider api */

struct krb5_enc_provider {
    /* keybytes is the input size to make_key;
       keylength is the output size */
    size_t block_size, keybytes, keylength;

    krb5_error_code (*encrypt)(krb5_key key, const krb5_data *cipher_state,
                               krb5_crypto_iov *data, size_t num_data);

    krb5_error_code (*decrypt)(krb5_key key, const krb5_data *cipher_state,
                               krb5_crypto_iov *data, size_t num_data);

    /* May be NULL if the cipher is not used for a cbc-mac checksum. */
    krb5_error_code (*cbc_mac)(krb5_key key, const krb5_crypto_iov *data,
                               size_t num_data, const krb5_data *ivec,
                               krb5_data *output);

    krb5_error_code (*make_key)(const krb5_data *randombits,
                                krb5_keyblock *key);

    krb5_error_code (*init_state)(const krb5_keyblock *key,
                                  krb5_keyusage keyusage,
                                  krb5_data *out_state);
    krb5_error_code (*free_state)(krb5_data *state);

    /* May be NULL if there is no key-derived data cached.  */
    void (*key_cleanup)(krb5_key key);
};

struct krb5_hash_provider {
    char hash_name[8];
    size_t hashsize, blocksize;

    krb5_error_code (*hash)(const krb5_crypto_iov *data, size_t num_data,
                            krb5_data *output);
};

/*
 * in here to deal with stuff from lib/crypto
 */

void krb5int_nfold(unsigned int inbits, const unsigned char *in,
                   unsigned int outbits, unsigned char *out);

krb5_error_code krb5int_hmac(const struct krb5_hash_provider *hash,
                             krb5_key key, const krb5_crypto_iov *data,
                             size_t num_data, krb5_data *output);

krb5_error_code
krb5int_hmac_keyblock(const struct krb5_hash_provider *hash,
                      const krb5_keyblock *keyblock,
                      const krb5_crypto_iov *data, size_t num_data,
                      krb5_data *output);

krb5_error_code krb5int_pbkdf2_hmac_sha1(const krb5_data *, unsigned long,
                                         const krb5_data *, const krb5_data *);

/* These crypto functions are used by GSSAPI via the accessor. */

krb5_error_code
krb5int_arcfour_gsscrypt(const krb5_keyblock *keyblock, krb5_keyusage usage,
                         const krb5_data *kd_data, krb5_crypto_iov *data,
                         size_t num_data);

/*
 * Attempt to zero memory in a way that compilers won't optimize out.
 *
 * This mechanism should work even for heap storage about to be freed,
 * or automatic storage right before we return from a function.
 *
 * Then, even if we leak uninitialized memory someplace, or UNIX
 * "core" files get created with world-read access, some of the most
 * sensitive data in the process memory will already be safely wiped.
 *
 * We're not going so far -- yet -- as to try to protect key data that
 * may have been written into swap space....
 */
#ifdef _WIN32
# define zap(ptr, len) SecureZeroMemory(ptr, len)
#elif defined(__GNUC__)
static inline void zap(void *ptr, size_t len)
{
    memset(ptr, 0, len);
    /*
     * Some versions of gcc have gotten clever enough to eliminate a
     * memset call right before the block in question is released.
     * This (empty) asm requires it to assume that we're doing
     * something interesting with the stored (zero) value, so the
     * memset can't be eliminated.
     *
     * An optimizer that looks at assembly or object code may not be
     * fooled, and may still cause the memset to go away.  Address
     * that problem if and when we encounter it.
     *
     * This also may not be enough if free() does something
     * interesting like purge memory locations from a write-back cache
     * that hasn't written back the zero bytes yet.  A memory barrier
     * instruction would help in that case.
     */
    asm volatile ("" : : "g" (ptr), "g" (len));
}
#else
/* Use a function from libkrb5support to defeat inlining. */
# define zap(ptr, len) krb5int_zap(ptr, len)
#endif

/* Convenience function: zap and free ptr if it is non-NULL. */
static inline void
zapfree(void *ptr, size_t len)
{
    if (ptr != NULL) {
        zap(ptr, len);
        free(ptr);
    }
}

/* A definition of init_state for DES based encryption systems.
 * sets up an 8-byte IV of all zeros
 */

krb5_error_code
krb5int_des_init_state(const krb5_keyblock *key, krb5_keyusage keyusage,
                       krb5_data *new_state);

/*
 * normally to free a cipher_state you can just memset the length to zero and
 * free it.
 */
krb5_error_code krb5int_default_free_state(krb5_data *state);


/*
 * Combine two keys (normally used by the hardware preauth mechanism)
 */
krb5_error_code
krb5int_c_combine_keys(krb5_context context, krb5_keyblock *key1,
                       krb5_keyblock *key2, krb5_keyblock *outkey);

void krb5int_c_free_keyblock(krb5_context, krb5_keyblock *key);
void krb5int_c_free_keyblock_contents(krb5_context, krb5_keyblock *);
krb5_error_code krb5int_c_init_keyblock(krb5_context, krb5_enctype enctype,
                                        size_t length, krb5_keyblock **out);
krb5_error_code krb5int_c_copy_keyblock(krb5_context context,
                                        const krb5_keyblock *from,
                                        krb5_keyblock **to);
krb5_error_code krb5int_c_copy_keyblock_contents(krb5_context context,
                                                 const krb5_keyblock *from,
                                                 krb5_keyblock *to);

/*
 * Internal - for cleanup.
 */
extern void krb5int_prng_cleanup(void);
extern void krb5int_crypto_impl_cleanup(void);


#ifdef KRB5_OLD_CRYPTO
/* old provider api */

krb5_error_code krb5_crypto_os_localaddr(krb5_address ***);

krb5_error_code krb5_crypto_us_timeofday(krb5_int32 *, krb5_int32 *);

#endif /* KRB5_OLD_CRYPTO */

/* this helper fct is in libkrb5, but it makes sense declared here. */

krb5_error_code
krb5_encrypt_keyhelper(krb5_context context, krb5_key key,
                       krb5_keyusage keyusage, const krb5_data *plain,
                       krb5_enc_data *cipher);

/*
 * End "los-proto.h"
 */

typedef struct _krb5_os_context {
    krb5_magic              magic;
    krb5_int32              time_offset;
    krb5_int32              usec_offset;
    krb5_int32              os_flags;
    char *                  default_ccname;
} *krb5_os_context;

/*
 * Flags for the os_flags field
 *
 * KRB5_OS_TOFFSET_VALID means that the time offset fields are valid.
 * The intention is that this facility to correct the system clocks so
 * that they reflect the "real" time, for systems where for some
 * reason we can't set the system clock.  Instead we calculate the
 * offset between the system time and real time, and store the offset
 * in the os context so that we can correct the system clock as necessary.
 *
 * KRB5_OS_TOFFSET_TIME means that the time offset fields should be
 * returned as the time by the krb5 time routines.  This should only
 * be used for testing purposes (obviously!)
 */
#define KRB5_OS_TOFFSET_VALID   1
#define KRB5_OS_TOFFSET_TIME    2

/* lock mode flags */
#define KRB5_LOCKMODE_SHARED    0x0001
#define KRB5_LOCKMODE_EXCLUSIVE 0x0002
#define KRB5_LOCKMODE_DONTBLOCK 0x0004
#define KRB5_LOCKMODE_UNLOCK    0x0008

/*
 * Define our view of the size of a DES key.
 */
#define KRB5_MIT_DES_KEYSIZE            8
#define KRB5_MIT_DES3_KEYSIZE           24
#define KRB5_MIT_DES3_KEY_BYTES         21

/*
 * Check if des_int.h has been included before us.  If so, then check to see
 * that our view of the DES key size is the same as des_int.h's.
 */
#ifdef  MIT_DES_KEYSIZE
#if     MIT_DES_KEYSIZE != KRB5_MIT_DES_KEYSIZE
error(MIT_DES_KEYSIZE does not equal KRB5_MIT_DES_KEYSIZE)
#endif  /* MIT_DES_KEYSIZE != KRB5_MIT_DES_KEYSIZE */
#endif  /* MIT_DES_KEYSIZE */

/*
 * Begin "preauth.h"
 *
 * (Originally written by Glen Machin at Sandia Labs.)
 */
/*
 * Sandia National Laboratories also makes no representations about the
 * suitability of the modifications, or additions to this software for
 * any purpose.  It is provided "as is" without express or implied warranty.
 *
 */
#ifndef KRB5_PREAUTH__
#define KRB5_PREAUTH__

#include <krb5/preauth_plugin.h>

#define CLIENT_ROCK_MAGIC 0x4352434b
/* This structure is passed into the client preauth functions and passed
 * back to the "get_data_proc" function so that it can locate the
 * requested information.  It is opaque to the plugin code and can be
 * expanded in the future as new types of requests are defined which
 * may require other things to be passed through. */
struct krb5int_fast_request_state;
typedef struct _krb5_preauth_client_rock {
    krb5_magic      magic;
    krb5_enctype *etype;
    struct krb5int_fast_request_state *fast_state;
} krb5_preauth_client_rock;

/* This structure lets us keep track of all of the modules which are loaded,
 * turning the list of modules and their lists of implemented preauth types
 * into a single list which we can walk easily. */
typedef struct _krb5_preauth_context {
    int n_modules;
    struct _krb5_preauth_context_module {
        /* Which of the possibly more than one preauth types which the
         * module supports we're using at this point in the list. */
        krb5_preauthtype pa_type;
        /* Encryption types which the client claims to support -- we
         * copy them directly into the krb5_kdc_req structure during
         * krb5_preauth_prepare_request(). */
        krb5_enctype *enctypes;
        /* The plugin's per-plugin context and a function to clear it. */
        void *plugin_context;
        preauth_client_plugin_fini_proc client_fini;
        /* The module's table, and some of its members, copied here for
         * convenience when we populated the list. */
        struct krb5plugin_preauth_client_ftable_v1 *ftable;
        const char *name;
        int flags, use_count;
        preauth_client_process_proc client_process;
        preauth_client_tryagain_proc client_tryagain;
        preauth_client_supply_gic_opts_proc client_supply_gic_opts;
        preauth_client_request_init_proc client_req_init;
        preauth_client_request_fini_proc client_req_fini;
        /* The per-request context which the client_req_init() function
         * might allocate, which we'll need to clean up later by
         * calling the client_req_fini() function. */
        void *request_context;
        /* A pointer to the request_context pointer.  All modules within
         * a plugin will point at the request_context of the first
         * module within the plugin. */
        void **request_context_pp;
    } *modules;
} krb5_preauth_context;

typedef struct _krb5_pa_enc_ts {
    krb5_timestamp      patimestamp;
    krb5_int32          pausec;
} krb5_pa_enc_ts;

typedef struct _krb5_pa_for_user {
    krb5_principal      user;
    krb5_checksum       cksum;
    krb5_data           auth_package;
} krb5_pa_for_user;

typedef struct _krb5_s4u_userid {
    krb5_int32          nonce;
    krb5_principal      user;
    krb5_data           subject_cert;
    krb5_flags          options;
} krb5_s4u_userid;

#define KRB5_S4U_OPTS_CHECK_LOGON_HOURS         0x40000000 /* check logon hour restrictions */
#define KRB5_S4U_OPTS_USE_REPLY_KEY_USAGE       0x20000000 /* sign with usage 27 instead of 26 */

typedef struct _krb5_pa_s4u_x509_user {
    krb5_s4u_userid     user_id;
    krb5_checksum       cksum;
} krb5_pa_s4u_x509_user;

enum {
    KRB5_FAST_ARMOR_AP_REQUEST = 0x1
};

typedef struct _krb5_fast_armor {
    krb5_int32 armor_type;
    krb5_data armor_value;
} krb5_fast_armor;
typedef struct _krb5_fast_armored_req {
    krb5_magic magic;
    krb5_fast_armor *armor;
    krb5_checksum req_checksum;
    krb5_enc_data enc_part;
} krb5_fast_armored_req;

typedef struct _krb5_fast_req {
    krb5_magic magic;
    krb5_flags fast_options;
    /* padata from req_body is used*/
    krb5_kdc_req *req_body;
} krb5_fast_req;

/* Bits 0-15 are critical in fast options.*/
#define UNSUPPORTED_CRITICAL_FAST_OPTIONS 0x00ff
#define KRB5_FAST_OPTION_HIDE_CLIENT_NAMES 0x01

typedef struct _krb5_fast_finished {
    krb5_timestamp timestamp;
    krb5_int32 usec;
    krb5_principal client;
    krb5_checksum ticket_checksum;
} krb5_fast_finished;

typedef struct _krb5_fast_response {
    krb5_magic magic;
    krb5_pa_data **padata;
    krb5_keyblock *strengthen_key;
    krb5_fast_finished *finished;
    krb5_int32 nonce;
} krb5_fast_response;

typedef struct _krb5_ad_kdcissued {
    krb5_checksum ad_checksum;
    krb5_principal i_principal;
    krb5_authdata **elements;
} krb5_ad_kdcissued;

typedef struct _krb5_ad_signedpath_data {
    krb5_principal client;
    krb5_timestamp authtime;
    krb5_principal *delegated;
    krb5_pa_data **method_data;
    krb5_authdata **authorization_data;
} krb5_ad_signedpath_data;

typedef struct _krb5_ad_signedpath {
    krb5_enctype enctype;
    krb5_checksum checksum;
    krb5_principal *delegated;
    krb5_pa_data **method_data;
} krb5_ad_signedpath;

typedef struct _krb5_iakerb_header {
    krb5_data target_realm;
    krb5_data *cookie;
} krb5_iakerb_header;

typedef struct _krb5_iakerb_finished {
    krb5_checksum checksum;
} krb5_iakerb_finished;

typedef krb5_error_code
(*krb5_preauth_obtain_proc)(krb5_context, krb5_pa_data *,
                            krb5_etype_info, krb5_keyblock *,
                            krb5_error_code (*)(krb5_context,
                                                const krb5_enctype,
                                                krb5_data *,
                                                krb5_const_pointer,
                                                krb5_keyblock **),
                            krb5_const_pointer, krb5_creds *,
                            krb5_kdc_req *, krb5_pa_data **);

typedef krb5_error_code
(*krb5_preauth_process_proc)(krb5_context, krb5_pa_data *, krb5_kdc_req *,
                             krb5_kdc_rep *,
                             krb5_error_code (*)(krb5_context,
                                                 const krb5_enctype,
                                                 krb5_data *,
                                                 krb5_const_pointer,
                                                 krb5_keyblock **),
                             krb5_const_pointer,
                             krb5_error_code (*)(krb5_context,
                                                 const krb5_keyblock *,
                                                 krb5_const_pointer,
                                                 krb5_kdc_rep * ),
                             krb5_keyblock **, krb5_creds *, krb5_int32 *,
                             krb5_int32 *);

typedef struct _krb5_preauth_ops {
    krb5_magic magic;
    int     type;
    int flags;
    krb5_preauth_obtain_proc    obtain;
    krb5_preauth_process_proc   process;
} krb5_preauth_ops;

krb5_pa_data *
krb5int_find_pa_data(krb5_context, krb5_pa_data *const *, krb5_preauthtype);
/* Does not return a copy; original padata sequence responsible for freeing*/

void krb5_free_etype_info(krb5_context, krb5_etype_info);

/*
 * Preauthentication property flags
 */
#define KRB5_PREAUTH_FLAGS_ENCRYPT      0x00000001
#define KRB5_PREAUTH_FLAGS_HARDWARE     0x00000002

#endif /* KRB5_PREAUTH__ */
/*
 * End "preauth.h"
 */

/*
 * Extending the krb5_get_init_creds_opt structure.  The original
 * krb5_get_init_creds_opt structure is defined publicly.  The
 * new extended version is private.  The original interface
 * assumed a pre-allocated structure which was passed to
 * krb5_get_init_creds_init().  The new interface assumes that
 * the caller will call krb5_get_init_creds_alloc() and
 * krb5_get_init_creds_free().
 *
 * Callers MUST NOT call krb5_get_init_creds_init() after allocating an
 * opts structure using krb5_get_init_creds_alloc().  To do so will
 * introduce memory leaks.  Unfortunately, there is no way to enforce
 * this behavior.
 *
 * Two private flags are added for backward compatibility.
 * KRB5_GET_INIT_CREDS_OPT_EXTENDED says that the structure was allocated
 * with the new krb5_get_init_creds_opt_alloc() function.
 * KRB5_GET_INIT_CREDS_OPT_SHADOWED is set to indicate that the extended
 * structure is a shadow copy of an original krb5_get_init_creds_opt
 * structure.
 * If KRB5_GET_INIT_CREDS_OPT_SHADOWED is set after a call to
 * krb5int_gic_opt_to_opte(), the resulting extended structure should be
 * freed (using krb5_get_init_creds_free).  Otherwise, the original
 * structure was already extended and there is no need to free it.
 */

#define KRB5_GET_INIT_CREDS_OPT_EXTENDED 0x80000000
#define KRB5_GET_INIT_CREDS_OPT_SHADOWED 0x40000000

#define krb5_gic_opt_is_extended(s)                                     \
    ((s) && ((s)->flags & KRB5_GET_INIT_CREDS_OPT_EXTENDED) ? 1 : 0)
#define krb5_gic_opt_is_shadowed(s)                                     \
    ((s) && ((s)->flags & KRB5_GET_INIT_CREDS_OPT_SHADOWED) ? 1 : 0)


typedef struct _krb5_gic_opt_private {
    int num_preauth_data;
    krb5_gic_opt_pa_data *preauth_data;
    char * fast_ccache_name;
    krb5_ccache out_ccache;
    krb5_flags fast_flags;
    krb5_expire_callback_func expire_cb;
    void *expire_data;
} krb5_gic_opt_private;

/*
 * On the Mac, ensure that the layout of krb5_gic_opt_ext matches that
 * of krb5_get_init_creds_opt.
 */
#if TARGET_OS_MAC
#    pragma pack(push,2)
#endif

typedef struct _krb5_gic_opt_ext {
    krb5_flags flags;
    krb5_deltat tkt_life;
    krb5_deltat renew_life;
    int forwardable;
    int proxiable;
    krb5_enctype *etype_list;
    int etype_list_length;
    krb5_address **address_list;
    krb5_preauthtype *preauth_list;
    int preauth_list_length;
    krb5_data *salt;
    /*
     * Do not change anything above this point in this structure.
     * It is identical to the public krb5_get_init_creds_opt structure.
     * New members must be added below.
     */
    krb5_gic_opt_private *opt_private;
} krb5_gic_opt_ext;

#if TARGET_OS_MAC
#    pragma pack(pop)
#endif

krb5_error_code
krb5int_gic_opt_to_opte(krb5_context context, krb5_get_init_creds_opt *opt,
                        krb5_gic_opt_ext **opte, unsigned int force,
                        const char *where);

krb5_error_code
krb5int_copy_data_contents(krb5_context, const krb5_data *, krb5_data *);

krb5_error_code
krb5int_copy_data_contents_add0(krb5_context, const krb5_data *, krb5_data *);

krb5_error_code
krb5int_copy_creds_contents(krb5_context, const krb5_creds *, krb5_creds *);

typedef krb5_error_code
(*krb5_gic_get_as_key_fct)(krb5_context, krb5_principal, krb5_enctype,
                           krb5_prompter_fct, void *prompter_data,
                           krb5_data *salt, krb5_data *s2kparams,
                           krb5_keyblock *as_key, void *gak_data);

krb5_error_code KRB5_CALLCONV
krb5int_get_init_creds(krb5_context context, krb5_creds *creds,
                       krb5_principal client, krb5_prompter_fct prompter,
                       void *prompter_data, krb5_deltat start_time,
                       char *in_tkt_service, krb5_get_init_creds_opt *options,
                       krb5_gic_get_as_key_fct gak, void *gak_data,
                       int *master, krb5_kdc_rep **as_reply);

krb5_error_code
krb5int_populate_gic_opt (krb5_context, krb5_get_init_creds_opt **,
                          krb5_flags options, krb5_address *const *addrs,
                          krb5_enctype *ktypes,
                          krb5_preauthtype *pre_auth_types, krb5_creds *creds);


krb5_error_code KRB5_CALLCONV
krb5_do_preauth(krb5_context context, krb5_kdc_req *request,
                krb5_data *encoded_request_body,
                krb5_data *encoded_previous_request, krb5_pa_data **in_padata,
                krb5_pa_data ***out_padata, krb5_data *salt,
                krb5_data *s2kparams, krb5_enctype *etype,
                krb5_keyblock *as_key, krb5_prompter_fct prompter,
                void *prompter_data, krb5_gic_get_as_key_fct gak_fct,
                void *gak_data, krb5_preauth_client_rock *get_data_rock,
                krb5_gic_opt_ext *opte);

krb5_error_code KRB5_CALLCONV
krb5_do_preauth_tryagain(krb5_context context, krb5_kdc_req *request,
                         krb5_data *encoded_request_body,
                         krb5_data *encoded_previous_request,
                         krb5_pa_data **in_padata, krb5_pa_data ***out_padata,
                         krb5_error *err_reply,
                         krb5_data *salt, krb5_data *s2kparams,
                         krb5_enctype *etype, krb5_keyblock *as_key,
                         krb5_prompter_fct prompter, void *prompter_data,
                         krb5_gic_get_as_key_fct gak_fct, void *gak_data,
                         krb5_preauth_client_rock *get_data_rock,
                         krb5_gic_opt_ext *opte);

void KRB5_CALLCONV krb5_init_preauth_context(krb5_context);
void KRB5_CALLCONV krb5_free_preauth_context(krb5_context);
void KRB5_CALLCONV krb5_clear_preauth_context_use_counts(krb5_context);
void KRB5_CALLCONV krb5_preauth_prepare_request(krb5_context,
                                                krb5_gic_opt_ext *,
                                                krb5_kdc_req *);
void KRB5_CALLCONV krb5_preauth_request_context_init(krb5_context);
void KRB5_CALLCONV krb5_preauth_request_context_fini(krb5_context);

void KRB5_CALLCONV
krb5_free_sam_challenge(krb5_context, krb5_sam_challenge *);

void KRB5_CALLCONV
krb5_free_sam_challenge_2(krb5_context, krb5_sam_challenge_2 *);

void KRB5_CALLCONV
krb5_free_sam_challenge_2_body(krb5_context, krb5_sam_challenge_2_body *);

void KRB5_CALLCONV
krb5_free_sam_response(krb5_context, krb5_sam_response *);

void KRB5_CALLCONV
krb5_free_sam_response_2(krb5_context, krb5_sam_response_2 *);

void KRB5_CALLCONV
krb5_free_predicted_sam_response(krb5_context, krb5_predicted_sam_response *);

void KRB5_CALLCONV
krb5_free_enc_sam_response_enc(krb5_context, krb5_enc_sam_response_enc *);

void KRB5_CALLCONV
krb5_free_enc_sam_response_enc_2(krb5_context, krb5_enc_sam_response_enc_2 *);

void KRB5_CALLCONV
krb5_free_sam_challenge_contents(krb5_context, krb5_sam_challenge *);

void KRB5_CALLCONV
krb5_free_sam_challenge_2_contents(krb5_context, krb5_sam_challenge_2 *);

void KRB5_CALLCONV
krb5_free_sam_challenge_2_body_contents(krb5_context,
                                        krb5_sam_challenge_2_body *);

void KRB5_CALLCONV
krb5_free_sam_response_contents(krb5_context, krb5_sam_response *);

void KRB5_CALLCONV
krb5_free_sam_response_2_contents(krb5_context, krb5_sam_response_2 *);

void KRB5_CALLCONV
krb5_free_predicted_sam_response_contents(krb5_context,
                                          krb5_predicted_sam_response * );

void KRB5_CALLCONV
krb5_free_enc_sam_response_enc_contents(krb5_context,
                                        krb5_enc_sam_response_enc * );

void KRB5_CALLCONV
krb5_free_enc_sam_response_enc_2_contents(krb5_context,
                                          krb5_enc_sam_response_enc_2 * );

void KRB5_CALLCONV
krb5_free_pa_enc_ts(krb5_context, krb5_pa_enc_ts *);

void KRB5_CALLCONV
krb5_free_pa_for_user(krb5_context, krb5_pa_for_user *);

void KRB5_CALLCONV
krb5_free_s4u_userid_contents(krb5_context, krb5_s4u_userid *);

void KRB5_CALLCONV
krb5_free_pa_s4u_x509_user(krb5_context, krb5_pa_s4u_x509_user *);

void KRB5_CALLCONV
krb5_free_pa_svr_referral_data(krb5_context, krb5_pa_svr_referral_data *);

void KRB5_CALLCONV
krb5_free_pa_server_referral_data(krb5_context,
                                  krb5_pa_server_referral_data * );

void KRB5_CALLCONV
krb5_free_pa_pac_req(krb5_context, krb5_pa_pac_req * );

void KRB5_CALLCONV
krb5_free_etype_list(krb5_context, krb5_etype_list * );

void KRB5_CALLCONV krb5_free_fast_armor(krb5_context, krb5_fast_armor *);
void KRB5_CALLCONV krb5_free_fast_armored_req(krb5_context,
                                              krb5_fast_armored_req *);
void KRB5_CALLCONV krb5_free_fast_req(krb5_context, krb5_fast_req *);
void KRB5_CALLCONV krb5_free_fast_finished(krb5_context, krb5_fast_finished *);
void KRB5_CALLCONV krb5_free_fast_response(krb5_context, krb5_fast_response *);
void KRB5_CALLCONV krb5_free_ad_kdcissued(krb5_context, krb5_ad_kdcissued *);
void KRB5_CALLCONV krb5_free_ad_signedpath(krb5_context, krb5_ad_signedpath *);
void KRB5_CALLCONV krb5_free_iakerb_header(krb5_context, krb5_iakerb_header *);
void KRB5_CALLCONV krb5_free_iakerb_finished(krb5_context,
                                             krb5_iakerb_finished *);

/* #include "krb5/wordsize.h" -- comes in through base-defs.h. */
#include "com_err.h"
#include "k5-plugin.h"

#include <krb5/authdata_plugin.h>

struct _krb5_authdata_context {
    krb5_magic magic;
    int n_modules;
    struct _krb5_authdata_context_module {
        krb5_authdatatype ad_type;
        void *plugin_context;
        authdata_client_plugin_fini_proc client_fini;
        krb5_flags flags;
        krb5plugin_authdata_client_ftable_v0 *ftable;
        authdata_client_request_init_proc client_req_init;
        authdata_client_request_fini_proc client_req_fini;
        const char *name;
        void *request_context;
        void **request_context_pp;
    } *modules;
    struct plugin_dir_handle plugins;
};

typedef struct _krb5_authdata_context *krb5_authdata_context;

void KRB5_CALLCONV
krb5int_free_data_list(krb5_context context, krb5_data *data);

krb5_error_code KRB5_CALLCONV
krb5_authdata_context_init(krb5_context kcontext,
                           krb5_authdata_context *pcontext);

void KRB5_CALLCONV
krb5_authdata_context_free(krb5_context kcontext,
                           krb5_authdata_context context);

krb5_error_code KRB5_CALLCONV
krb5_authdata_export_authdata(krb5_context kcontext,
                              krb5_authdata_context context, krb5_flags usage,
                              krb5_authdata ***pauthdata);

krb5_error_code KRB5_CALLCONV
krb5_authdata_get_attribute_types(krb5_context kcontext,
                                  krb5_authdata_context context,
                                  krb5_data **attrs);

krb5_error_code KRB5_CALLCONV
krb5_authdata_get_attribute(krb5_context kcontext,
                            krb5_authdata_context context,
                            const krb5_data *attribute,
                            krb5_boolean *authenticated,
                            krb5_boolean *complete, krb5_data *value,
                            krb5_data *display_value, int *more);

krb5_error_code KRB5_CALLCONV
krb5_authdata_set_attribute(krb5_context kcontext,
                            krb5_authdata_context context,
                            krb5_boolean complete, const krb5_data *attribute,
                            const krb5_data *value);

krb5_error_code KRB5_CALLCONV
krb5_authdata_delete_attribute(krb5_context kcontext,
                               krb5_authdata_context context,
                               const krb5_data *attribute);

krb5_error_code KRB5_CALLCONV
krb5_authdata_import_attributes(krb5_context kcontext,
                                krb5_authdata_context context,
                                krb5_flags usage, const krb5_data *attributes);

krb5_error_code KRB5_CALLCONV
krb5_authdata_export_attributes(krb5_context kcontext,
                                krb5_authdata_context context,
                                krb5_flags usage, krb5_data **pattributes);

krb5_error_code KRB5_CALLCONV
krb5_authdata_export_internal(krb5_context kcontext,
                              krb5_authdata_context context,
                              krb5_boolean restrict_authenticated,
                              const char *module, void **ptr);

krb5_error_code KRB5_CALLCONV
krb5_authdata_context_copy(krb5_context kcontext, krb5_authdata_context src,
                           krb5_authdata_context *dst);

krb5_error_code KRB5_CALLCONV
krb5_authdata_free_internal(krb5_context kcontext,
                            krb5_authdata_context context, const char *module,
                            void *ptr);

/*** Plugin framework ***/

/*
 * This framework can be used to create pluggable interfaces.  Not all existing
 * pluggable interface use this framework, but new ones should.  A new
 * pluggable interface entails:
 *
 * - An interface ID definition in the list of #defines below.
 *
 * - A name in the interface_names array in lib/krb5/krb/plugins.c.
 *
 * - An installed public header file in include/krb5.  The public header should
 *   include <krb5/plugin.h> and should declare a vtable structure for each
 *   supported major version of the interface.
 *
 * - A consumer API implementation, located within the code unit which makes
 *   use of the pluggable interface.  The consumer API should consist of:
 *
 *   . An interface-specific handle type which contains a vtable structure for
 *     the module (or a union of several such structures, if there are multiple
 *     supported major versions) and, optionally, resource data bound to the
 *     handle.
 *
 *   . An interface-specific loader function which creates a handle or list of
 *     handles.  A list of handles would be created if the interface is a
 *     one-to-many interface where the consumer wants to consult all available
 *     modules; a single handle would be created for an interface where the
 *     consumer wants to consult a specific module.  The loader function should
 *     use k5_plugin_load or k5_plugin_load_all to produce one or a list of
 *     vtable initializer functions, and should use those functions to fill in
 *     the vtable structure for the module (if necessary, trying each supported
 *     major version starting from the most recent).  The loader function can
 *     also bind resource data into the handle based on caller arguments, if
 *     appropriate.
 *
 *   . For each plugin method, a wrapper function which accepts a krb5_context,
 *     a plugin handle, and the method arguments.  Wrapper functions should
 *     invoke the method function contained in the handle's vtable.
 *
 * - Possibly, built-in implementations of the interface, also located within
 *   the code unit which makes use of the interface.  Built-in implementations
 *   must be registered with k5_plugin_register before the first call to
 *   k5_plugin_load or k5_plugin_load_all.
 *
 * A pluggable interface should have one or more currently supported major
 * versions, starting at 1.  Each major version should have a current minor
 * version, also starting at 1.  If new methods are added to a vtable, the
 * minor version should be incremented and the vtable stucture should document
 * where each minor vtable version ends.  If method signatures for a vtable are
 * changed, the major version should be incremented.
 *
 * Plugin module implementations (either built-in or dynamically loaded) should
 * define a function named <interfacename>_<modulename>_initvt, matching the
 * signature of krb5_plugin_initvt_fn as declared in include/krb5/plugin.h.
 * The initvt function should check the given maj_ver argument against its own
 * supported major versions, cast the vtable pointer to the appropriate
 * interface-specific vtable type, and fill in the vtable methods, stopping as
 * appropriate for the given min_ver.  Memory for the vtable structure is
 * allocated by the caller, not by the module.
 *
 * Dynamic plugin modules are registered with the framework through the
 * [plugins] section of the profile, as described in the admin documentation
 * and krb5.conf man page.
 */

/*
 * A linked list entry mapping a module name to a module initvt function.  The
 * entry may also include a dynamic object handle so that it can be released
 * when the context is destroyed.
 */
struct plugin_mapping {
    char *modname;
    krb5_plugin_initvt_fn module;
    struct plugin_file_handle *dyn_handle;
    struct plugin_mapping *next;
};

/* Holds krb5_context information about each pluggable interface. */
struct plugin_interface {
    struct plugin_mapping *modules;
    krb5_boolean configured;
};

/* A list of plugin interface IDs.  Make sure to increment
 * PLUGIN_NUM_INTERFACES when a new interface is added. */
#define PLUGIN_INTERFACE_PWQUAL 0
#define PLUGIN_INTERFACE_KADM5_HOOK 1
#define PLUGIN_NUM_INTERFACES   2

/* Retrieve the plugin module of type interface_id and name modname,
 * storing the result into module. */
krb5_error_code
k5_plugin_load(krb5_context context, int interface_id, const char *modname,
               krb5_plugin_initvt_fn *module);

/* Retrieve all plugin modules of type interface_id, storing the result
 * into modules.  Free the result with k5_plugin_free_handles. */
krb5_error_code
k5_plugin_load_all(krb5_context context, int interface_id,
                   krb5_plugin_initvt_fn **modules);

/* Release a module list allocated by k5_plugin_load_all. */
void
k5_plugin_free_modules(krb5_context context, krb5_plugin_initvt_fn *modules);

/* Register a plugin module of type interface_id and name modname. */
krb5_error_code
k5_plugin_register(krb5_context context, int interface_id, const char *modname,
                   krb5_plugin_initvt_fn module);

/* Destroy the module state within context; used by krb5_free_context. */
void
k5_plugin_free_context(krb5_context context);

struct _kdb5_dal_handle;        /* private, in kdb5.h */
typedef struct _kdb5_dal_handle kdb5_dal_handle;
struct _kdb_log_context;
struct _krb5_context {
    krb5_magic      magic;
    krb5_enctype    *in_tkt_etypes;
    krb5_enctype    *tgs_etypes;
    struct _krb5_os_context os_context;
    char            *default_realm;
    profile_t       profile;
    kdb5_dal_handle *dal_handle;
    int             ser_ctx_count;
    void            *ser_ctx;
    /* allowable clock skew */
    krb5_deltat     clockskew;
    krb5_cksumtype  kdc_req_sumtype;
    krb5_cksumtype  default_ap_req_sumtype;
    krb5_cksumtype  default_safe_sumtype;
    krb5_flags      kdc_default_options;
    krb5_flags      library_options;
    krb5_boolean    profile_secure;
    int             fcc_default_format;
    krb5_prompt_type *prompt_types;
    /* Message size above which we'll try TCP first in send-to-kdc
       type code.  Aside from the 2**16 size limit, we put no
       absolute limit on the UDP packet size.  */
    int             udp_pref_limit;

    /* Use the config-file ktypes instead of app-specified?  */
    krb5_boolean    use_conf_ktypes;

#ifdef KRB5_DNS_LOOKUP
    krb5_boolean    profile_in_memory;
#endif /* KRB5_DNS_LOOKUP */

    /* locate_kdc module stuff */
    struct plugin_dir_handle libkrb5_plugins;
    struct krb5plugin_service_locate_ftable *vtbl;
    void (**locate_fptrs)(void);

    /* preauth module stuff */
    struct plugin_dir_handle preauth_plugins;
    krb5_preauth_context *preauth_context;

    /* error detail info */
    struct errinfo err;

    /* For Sun iprop code; does this really have to be here?  */
    struct _kdb_log_context *kdblog_context;

    krb5_boolean allow_weak_crypto;

    krb5_trace_callback trace_callback;
    void *trace_callback_data;

    struct plugin_interface plugins[PLUGIN_NUM_INTERFACES];
};

/* could be used in a table to find an etype and initialize a block */


#define KRB5_LIBOPT_SYNC_KDCTIME        0x0001

/* internal message representations */

typedef struct _krb5_safe {
    krb5_magic magic;
    krb5_data user_data;                /* user data */
    krb5_timestamp timestamp;           /* client time, optional */
    krb5_int32 usec;                    /* microsecond portion of time,
                                           optional */
    krb5_ui_4 seq_number;               /* sequence #, optional */
    krb5_address *s_address;    /* sender address */
    krb5_address *r_address;    /* recipient address, optional */
    krb5_checksum *checksum;    /* data integrity checksum */
} krb5_safe;

typedef struct _krb5_priv {
    krb5_magic magic;
    krb5_enc_data enc_part;             /* encrypted part */
} krb5_priv;

typedef struct _krb5_priv_enc_part {
    krb5_magic magic;
    krb5_data user_data;                /* user data */
    krb5_timestamp timestamp;           /* client time, optional */
    krb5_int32 usec;                    /* microsecond portion of time, opt. */
    krb5_ui_4 seq_number;               /* sequence #, optional */
    krb5_address *s_address;    /* sender address */
    krb5_address *r_address;    /* recipient address, optional */
} krb5_priv_enc_part;

void KRB5_CALLCONV krb5_free_safe(krb5_context, krb5_safe *);
void KRB5_CALLCONV krb5_free_priv(krb5_context, krb5_priv *);
void KRB5_CALLCONV krb5_free_priv_enc_part(krb5_context, krb5_priv_enc_part *);

/*
 * Begin "asn1.h"
 */
#ifndef KRB5_ASN1__
#define KRB5_ASN1__

/* ASN.1 encoding knowledge; KEEP IN SYNC WITH ASN.1 defs! */
/* here we use some knowledge of ASN.1 encodings */
/*
  Ticket is APPLICATION 1.
  Authenticator is APPLICATION 2.
  AS_REQ is APPLICATION 10.
  AS_REP is APPLICATION 11.
  TGS_REQ is APPLICATION 12.
  TGS_REP is APPLICATION 13.
  AP_REQ is APPLICATION 14.
  AP_REP is APPLICATION 15.
  KRB_SAFE is APPLICATION 20.
  KRB_PRIV is APPLICATION 21.
  KRB_CRED is APPLICATION 22.
  EncASRepPart is APPLICATION 25.
  EncTGSRepPart is APPLICATION 26.
  EncAPRepPart is APPLICATION 27.
  EncKrbPrivPart is APPLICATION 28.
  EncKrbCredPart is APPLICATION 29.
  KRB_ERROR is APPLICATION 30.
*/
/* allow either constructed or primitive encoding, so check for bit 6
   set or reset */
#define krb5int_is_app_tag(dat,tag)                     \
    ((dat != NULL) && (dat)->length &&                  \
     ((((dat)->data[0] & ~0x20) == ((tag) | 0x40))))
#define krb5_is_krb_ticket(dat)               krb5int_is_app_tag(dat, 1)
#define krb5_is_krb_authenticator(dat)        krb5int_is_app_tag(dat, 2)
#define krb5_is_as_req(dat)                   krb5int_is_app_tag(dat, 10)
#define krb5_is_as_rep(dat)                   krb5int_is_app_tag(dat, 11)
#define krb5_is_tgs_req(dat)                  krb5int_is_app_tag(dat, 12)
#define krb5_is_tgs_rep(dat)                  krb5int_is_app_tag(dat, 13)
#define krb5_is_ap_req(dat)                   krb5int_is_app_tag(dat, 14)
#define krb5_is_ap_rep(dat)                   krb5int_is_app_tag(dat, 15)
#define krb5_is_krb_safe(dat)                 krb5int_is_app_tag(dat, 20)
#define krb5_is_krb_priv(dat)                 krb5int_is_app_tag(dat, 21)
#define krb5_is_krb_cred(dat)                 krb5int_is_app_tag(dat, 22)
#define krb5_is_krb_enc_as_rep_part(dat)      krb5int_is_app_tag(dat, 25)
#define krb5_is_krb_enc_tgs_rep_part(dat)     krb5int_is_app_tag(dat, 26)
#define krb5_is_krb_enc_ap_rep_part(dat)      krb5int_is_app_tag(dat, 27)
#define krb5_is_krb_enc_krb_priv_part(dat)    krb5int_is_app_tag(dat, 28)
#define krb5_is_krb_enc_krb_cred_part(dat)    krb5int_is_app_tag(dat, 29)
#define krb5_is_krb_error(dat)                krb5int_is_app_tag(dat, 30)

/*************************************************************************
 * Prototypes for krb5_encode.c
 *************************************************************************/

/*
  krb5_error_code encode_krb5_structure(const krb5_structure *rep,
  krb5_data **code);
  modifies  *code
  effects   Returns the ASN.1 encoding of *rep in **code.
  Returns ASN1_MISSING_FIELD if a required field is emtpy in *rep.
  Returns ENOMEM if memory runs out.
*/

krb5_error_code
encode_krb5_authenticator(const krb5_authenticator *rep, krb5_data **code);

krb5_error_code
encode_krb5_ticket(const krb5_ticket *rep, krb5_data **code);

krb5_error_code
encode_krb5_enc_tkt_part(const krb5_enc_tkt_part *rep, krb5_data **code);

krb5_error_code
encode_krb5_enc_kdc_rep_part(const krb5_enc_kdc_rep_part *rep,
                             krb5_data **code);

/* yes, the translation is identical to that used for KDC__REP */
krb5_error_code
encode_krb5_as_rep(const krb5_kdc_rep *rep, krb5_data **code);

/* yes, the translation is identical to that used for KDC__REP */
krb5_error_code
encode_krb5_tgs_rep(const krb5_kdc_rep *rep, krb5_data **code);

krb5_error_code
encode_krb5_ap_req(const krb5_ap_req *rep, krb5_data **code);

krb5_error_code
encode_krb5_ap_rep(const krb5_ap_rep *rep, krb5_data **code);

krb5_error_code
encode_krb5_ap_rep_enc_part(const krb5_ap_rep_enc_part *rep, krb5_data **code);

krb5_error_code
encode_krb5_as_req(const krb5_kdc_req *rep, krb5_data **code);

krb5_error_code
encode_krb5_tgs_req(const krb5_kdc_req *rep, krb5_data **code);

krb5_error_code
encode_krb5_kdc_req_body(const krb5_kdc_req *rep, krb5_data **code);

krb5_error_code
encode_krb5_safe(const krb5_safe *rep, krb5_data **code);

struct krb5_safe_with_body {
    krb5_safe *safe;
    krb5_data *body;
};
krb5_error_code
encode_krb5_safe_with_body(const struct krb5_safe_with_body *rep,
                           krb5_data **code);

krb5_error_code
encode_krb5_priv(const krb5_priv *rep, krb5_data **code);

krb5_error_code
encode_krb5_enc_priv_part(const krb5_priv_enc_part *rep, krb5_data **code);

krb5_error_code
encode_krb5_cred(const krb5_cred *rep, krb5_data **code);
krb5_error_code
encode_krb5_checksum(const krb5_checksum *, krb5_data **);

krb5_error_code
encode_krb5_enc_cred_part(const krb5_cred_enc_part *rep, krb5_data **code);

krb5_error_code
encode_krb5_error(const krb5_error *rep, krb5_data **code);

krb5_error_code
encode_krb5_authdata(krb5_authdata *const *rep, krb5_data **code);

krb5_error_code
encode_krb5_authdata_elt(const krb5_authdata *rep, krb5_data **code);

krb5_error_code
encode_krb5_pwd_sequence(const passwd_phrase_element *rep, krb5_data **code);

krb5_error_code
encode_krb5_pwd_data(const krb5_pwd_data *rep, krb5_data **code);

krb5_error_code
encode_krb5_padata_sequence(krb5_pa_data *const *rep, krb5_data **code);

krb5_error_code
encode_krb5_alt_method(const krb5_alt_method *, krb5_data **code);

krb5_error_code
encode_krb5_etype_info(krb5_etype_info_entry *const *, krb5_data **code);

krb5_error_code
encode_krb5_etype_info2(krb5_etype_info_entry *const *, krb5_data **code);

krb5_error_code
encode_krb5_pa_enc_ts(const krb5_pa_enc_ts *, krb5_data **);

krb5_error_code
encode_krb5_sam_challenge(const krb5_sam_challenge * , krb5_data **);

krb5_error_code
encode_krb5_sam_key(const krb5_sam_key * , krb5_data **);

krb5_error_code
encode_krb5_enc_sam_response_enc(const krb5_enc_sam_response_enc *,
                                 krb5_data **);

krb5_error_code
encode_krb5_sam_response(const krb5_sam_response *, krb5_data **);

krb5_error_code
encode_krb5_sam_challenge_2(const krb5_sam_challenge_2 * , krb5_data **);

krb5_error_code
encode_krb5_sam_challenge_2_body(const krb5_sam_challenge_2_body *,
                                 krb5_data **);

krb5_error_code
encode_krb5_enc_sam_response_enc_2(const krb5_enc_sam_response_enc_2 *,
                                   krb5_data **);

krb5_error_code
encode_krb5_sam_response_2(const krb5_sam_response_2 * , krb5_data **);

krb5_error_code
encode_krb5_predicted_sam_response(const krb5_predicted_sam_response *,
                                   krb5_data **);

struct krb5_setpw_req {
    krb5_principal target;
    krb5_data password;
};
krb5_error_code
encode_krb5_setpw_req(const struct krb5_setpw_req *rep, krb5_data **code);

krb5_error_code
encode_krb5_pa_for_user(const krb5_pa_for_user *, krb5_data **);

krb5_error_code
encode_krb5_s4u_userid(const krb5_s4u_userid *, krb5_data **);

krb5_error_code
encode_krb5_pa_s4u_x509_user(const krb5_pa_s4u_x509_user *, krb5_data **);

krb5_error_code
encode_krb5_pa_svr_referral_data(const krb5_pa_svr_referral_data *,
                                 krb5_data **);

krb5_error_code
encode_krb5_pa_server_referral_data(const krb5_pa_server_referral_data *,
                                    krb5_data **);

krb5_error_code
encode_krb5_pa_pac_req(const krb5_pa_pac_req *, krb5_data **);

krb5_error_code
encode_krb5_etype_list(const krb5_etype_list * , krb5_data **);

krb5_error_code
encode_krb5_pa_fx_fast_request(const krb5_fast_armored_req *, krb5_data **);

krb5_error_code
encode_krb5_fast_req(const krb5_fast_req *, krb5_data **);

krb5_error_code
encode_krb5_pa_fx_fast_reply(const krb5_enc_data *, krb5_data **);

krb5_error_code
encode_krb5_iakerb_header(const krb5_iakerb_header *, krb5_data **);

krb5_error_code
encode_krb5_iakerb_finished(const krb5_iakerb_finished *, krb5_data **);

krb5_error_code
encode_krb5_fast_response(const krb5_fast_response *, krb5_data **);

krb5_error_code
encode_krb5_ad_kdcissued(const krb5_ad_kdcissued *, krb5_data **);

krb5_error_code
encode_krb5_ad_signedpath(const krb5_ad_signedpath *, krb5_data **);

krb5_error_code
encode_krb5_ad_signedpath_data(const krb5_ad_signedpath_data *, krb5_data **);

/*************************************************************************
 * End of prototypes for krb5_encode.c
 *************************************************************************/

krb5_error_code
decode_krb5_sam_challenge(const krb5_data *, krb5_sam_challenge **);

krb5_error_code
decode_krb5_enc_sam_key(const krb5_data *, krb5_sam_key **);

krb5_error_code
decode_krb5_enc_sam_response_enc(const krb5_data *,
                                 krb5_enc_sam_response_enc **);

krb5_error_code
decode_krb5_sam_response(const krb5_data *, krb5_sam_response **);

krb5_error_code
decode_krb5_predicted_sam_response(const krb5_data *,
                                   krb5_predicted_sam_response **);

krb5_error_code
decode_krb5_sam_challenge_2(const krb5_data *, krb5_sam_challenge_2 **);

krb5_error_code
decode_krb5_sam_challenge_2_body(const krb5_data *,
                                 krb5_sam_challenge_2_body **);

krb5_error_code
decode_krb5_enc_sam_response_enc_2(const krb5_data *,
                                   krb5_enc_sam_response_enc_2 **);

krb5_error_code
decode_krb5_sam_response_2(const krb5_data *, krb5_sam_response_2 **);


/*************************************************************************
 * Prototypes for krb5_decode.c
 *************************************************************************/
/*
  krb5_error_code decode_krb5_structure(const krb5_data *code,
  krb5_structure **rep);

  requires  Expects **rep to not have been allocated;
  a new *rep is allocated regardless of the old value.
  effects   Decodes *code into **rep.
  Returns ENOMEM if memory is exhausted.
  Returns asn1 and krb5 errors.
*/

krb5_error_code
decode_krb5_authenticator(const krb5_data *code, krb5_authenticator **rep);

krb5_error_code
decode_krb5_ticket(const krb5_data *code, krb5_ticket **rep);

krb5_error_code
decode_krb5_encryption_key(const krb5_data *output, krb5_keyblock **rep);

krb5_error_code
decode_krb5_enc_tkt_part(const krb5_data *output, krb5_enc_tkt_part **rep);

krb5_error_code
decode_krb5_enc_kdc_rep_part(const krb5_data *output,
                             krb5_enc_kdc_rep_part **rep);

krb5_error_code
decode_krb5_as_rep(const krb5_data *output, krb5_kdc_rep **rep);

krb5_error_code
decode_krb5_tgs_rep(const krb5_data *output, krb5_kdc_rep **rep);

krb5_error_code
decode_krb5_ap_req(const krb5_data *output, krb5_ap_req **rep);

krb5_error_code
decode_krb5_ap_rep(const krb5_data *output, krb5_ap_rep **rep);

krb5_error_code
decode_krb5_ap_rep_enc_part(const krb5_data *output,
                            krb5_ap_rep_enc_part **rep);

krb5_error_code
decode_krb5_as_req(const krb5_data *output, krb5_kdc_req **rep);

krb5_error_code
decode_krb5_tgs_req(const krb5_data *output, krb5_kdc_req **rep);

krb5_error_code
decode_krb5_kdc_req_body(const krb5_data *output, krb5_kdc_req **rep);

krb5_error_code
decode_krb5_safe(const krb5_data *output, krb5_safe **rep);

krb5_error_code
decode_krb5_safe_with_body(const krb5_data *output, krb5_safe **rep,
                           krb5_data *body);

krb5_error_code
decode_krb5_priv(const krb5_data *output, krb5_priv **rep);

krb5_error_code
decode_krb5_enc_priv_part(const krb5_data *output, krb5_priv_enc_part **rep);
krb5_error_code
decode_krb5_checksum(const krb5_data *, krb5_checksum **);

krb5_error_code
decode_krb5_cred(const krb5_data *output, krb5_cred **rep);

krb5_error_code
decode_krb5_enc_cred_part(const krb5_data *output, krb5_cred_enc_part **rep);

krb5_error_code
decode_krb5_error(const krb5_data *output, krb5_error **rep);

krb5_error_code
decode_krb5_authdata(const krb5_data *output, krb5_authdata ***rep);

krb5_error_code
decode_krb5_pwd_sequence(const krb5_data *output, passwd_phrase_element **rep);

krb5_error_code
decode_krb5_pwd_data(const krb5_data *output, krb5_pwd_data **rep);

krb5_error_code
decode_krb5_padata_sequence(const krb5_data *output, krb5_pa_data ***rep);

krb5_error_code
decode_krb5_alt_method(const krb5_data *output, krb5_alt_method **rep);

krb5_error_code
decode_krb5_etype_info(const krb5_data *output, krb5_etype_info_entry ***rep);

krb5_error_code
decode_krb5_etype_info2(const krb5_data *output, krb5_etype_info_entry ***rep);

krb5_error_code
decode_krb5_enc_data(const krb5_data *output, krb5_enc_data **rep);

krb5_error_code
decode_krb5_pa_enc_ts(const krb5_data *output, krb5_pa_enc_ts **rep);

krb5_error_code
decode_krb5_sam_key(const krb5_data *, krb5_sam_key **);

krb5_error_code
decode_krb5_setpw_req(const krb5_data *, krb5_data **, krb5_principal *);

krb5_error_code
decode_krb5_pa_for_user(const krb5_data *, krb5_pa_for_user **);

krb5_error_code
decode_krb5_pa_s4u_x509_user(const krb5_data *, krb5_pa_s4u_x509_user **);

krb5_error_code
decode_krb5_pa_svr_referral_data(const krb5_data *,
                                 krb5_pa_svr_referral_data **);

krb5_error_code
decode_krb5_pa_server_referral_data(const krb5_data *,
                                    krb5_pa_server_referral_data **);

krb5_error_code
decode_krb5_pa_pac_req(const krb5_data *, krb5_pa_pac_req **);

krb5_error_code
decode_krb5_etype_list(const krb5_data *, krb5_etype_list **);

krb5_error_code
decode_krb5_pa_fx_fast_request(const krb5_data *, krb5_fast_armored_req **);

krb5_error_code
decode_krb5_fast_req(const krb5_data *, krb5_fast_req **);

krb5_error_code
decode_krb5_pa_fx_fast_reply(const krb5_data *, krb5_enc_data **);

krb5_error_code
decode_krb5_fast_response(const krb5_data *, krb5_fast_response **);

krb5_error_code
decode_krb5_ad_kdcissued(const krb5_data *, krb5_ad_kdcissued **);

krb5_error_code
decode_krb5_ad_signedpath(const krb5_data *, krb5_ad_signedpath **);

krb5_error_code
decode_krb5_iakerb_header(const krb5_data *, krb5_iakerb_header **);

krb5_error_code
decode_krb5_iakerb_finished(const krb5_data *, krb5_iakerb_finished **);

struct _krb5_key_data;          /* kdb.h */

struct ldap_seqof_key_data {
    krb5_int32 mkvno;           /* Master key version number */
    struct _krb5_key_data *key_data;
    krb5_int16 n_key_data;
};
typedef struct ldap_seqof_key_data ldap_seqof_key_data;

krb5_error_code
krb5int_ldap_encode_sequence_of_keys(const ldap_seqof_key_data *val,
                                     krb5_data **code);

krb5_error_code
krb5int_ldap_decode_sequence_of_keys(krb5_data *in,
                                     ldap_seqof_key_data **rep);

/*************************************************************************
 * End of prototypes for krb5_decode.c
 *************************************************************************/

#endif /* KRB5_ASN1__ */
/*
 * End "asn1.h"
 */


/*
 * Internal krb5 library routines
 */
krb5_error_code
krb5_encrypt_tkt_part(krb5_context, const krb5_keyblock *, krb5_ticket *);

krb5_error_code
krb5_encode_kdc_rep(krb5_context, krb5_msgtype, const krb5_enc_kdc_rep_part *,
                    int using_subkey, const krb5_keyblock *, krb5_kdc_rep *,
                    krb5_data ** );

krb5_boolean
krb5int_auth_con_chkseqnum(krb5_context ctx, krb5_auth_context ac,
                           krb5_ui_4 in_seq);
/*
 * [De]Serialization Handle and operations.
 */
struct __krb5_serializer {
    krb5_magic          odtype;
    krb5_error_code     (*sizer) (krb5_context,
                                  krb5_pointer,
                                  size_t *);
    krb5_error_code     (*externalizer) (krb5_context,
                                         krb5_pointer,
                                         krb5_octet **,
                                         size_t *);
    krb5_error_code     (*internalizer) (krb5_context,
                                         krb5_pointer *,
                                         krb5_octet **,
                                         size_t *);
};
typedef const struct __krb5_serializer * krb5_ser_handle;
typedef struct __krb5_serializer krb5_ser_entry;

krb5_ser_handle krb5_find_serializer(krb5_context, krb5_magic);
krb5_error_code krb5_register_serializer(krb5_context, const krb5_ser_entry *);

/* Determine the external size of a particular opaque structure */
krb5_error_code KRB5_CALLCONV
krb5_size_opaque(krb5_context, krb5_magic, krb5_pointer, size_t *);

/* Serialize the structure into a buffer */
krb5_error_code KRB5_CALLCONV
krb5_externalize_opaque(krb5_context, krb5_magic, krb5_pointer, krb5_octet **,
                        size_t *);

/* Deserialize the structure from a buffer */
krb5_error_code KRB5_CALLCONV
krb5_internalize_opaque(krb5_context, krb5_magic, krb5_pointer *,
                        krb5_octet **, size_t *);

/* Serialize data into a buffer */
krb5_error_code
krb5_externalize_data(krb5_context, krb5_pointer, krb5_octet **, size_t *);
/*
 * Initialization routines.
 */

/* Initialize serialization for krb5_[os_]context */
krb5_error_code KRB5_CALLCONV krb5_ser_context_init(krb5_context);

/* Initialize serialization for krb5_auth_context */
krb5_error_code KRB5_CALLCONV krb5_ser_auth_context_init(krb5_context);

/* Initialize serialization for krb5_keytab */
krb5_error_code KRB5_CALLCONV krb5_ser_keytab_init(krb5_context);

/* Initialize serialization for krb5_ccache */
krb5_error_code KRB5_CALLCONV krb5_ser_ccache_init(krb5_context);

/* Initialize serialization for krb5_rcache */
krb5_error_code KRB5_CALLCONV krb5_ser_rcache_init(krb5_context);

/* [De]serialize 4-byte integer */
krb5_error_code KRB5_CALLCONV
krb5_ser_pack_int32(krb5_int32, krb5_octet **, size_t *);

krb5_error_code KRB5_CALLCONV
krb5_ser_unpack_int32(krb5_int32 *, krb5_octet **, size_t *);

/* [De]serialize 8-byte integer */
krb5_error_code KRB5_CALLCONV
krb5_ser_pack_int64(krb5_int64, krb5_octet **, size_t *);

krb5_error_code KRB5_CALLCONV
krb5_ser_unpack_int64(krb5_int64 *, krb5_octet **, size_t *);

/* [De]serialize byte string */
krb5_error_code KRB5_CALLCONV
krb5_ser_pack_bytes(krb5_octet *, size_t, krb5_octet **, size_t *);

krb5_error_code KRB5_CALLCONV
krb5_ser_unpack_bytes(krb5_octet *, size_t, krb5_octet **, size_t *);

krb5_error_code KRB5_CALLCONV
krb5int_cc_default(krb5_context, krb5_ccache *);

krb5_error_code KRB5_CALLCONV
krb5_cc_retrieve_cred_default(krb5_context, krb5_ccache, krb5_flags,
                              krb5_creds *, krb5_creds *);

krb5_boolean KRB5_CALLCONV
krb5_creds_compare(krb5_context in_context, krb5_creds *in_creds,
                   krb5_creds *in_compare_creds);

void
krb5int_set_prompt_types(krb5_context, krb5_prompt_type *);

krb5_error_code
krb5int_generate_and_save_subkey(krb5_context, krb5_auth_context,
                                 krb5_keyblock * /* Old keyblock, not new!  */,
                                 krb5_enctype);

/* set and change password helpers */

krb5_error_code
krb5int_mk_chpw_req(krb5_context context, krb5_auth_context auth_context,
                    krb5_data *ap_req, char *passwd, krb5_data *packet);

krb5_error_code
krb5int_rd_chpw_rep(krb5_context context, krb5_auth_context auth_context,
                    krb5_data *packet, int *result_code,
                    krb5_data *result_data);

krb5_error_code KRB5_CALLCONV
krb5_chpw_result_code_string(krb5_context context, int result_code,
                             char **result_codestr);

krb5_error_code
krb5int_mk_setpw_req(krb5_context context, krb5_auth_context auth_context,
                     krb5_data *ap_req, krb5_principal targetprinc,
                     char *passwd, krb5_data *packet);

krb5_error_code
krb5int_rd_setpw_rep(krb5_context context, krb5_auth_context auth_context,
                     krb5_data *packet, int *result_code,
                     krb5_data *result_data);

krb5_error_code
krb5int_setpw_result_code_string(krb5_context context, int result_code,
                                 const char **result_codestr);

struct srv_dns_entry {
    struct srv_dns_entry *next;
    int priority;
    int weight;
    unsigned short port;
    char *host;
};
#ifdef KRB5_DNS_LOOKUP

#define MAX_DNS_NAMELEN (15*(MAXHOSTNAMELEN + 1)+1)

krb5_error_code
krb5int_make_srv_query_realm(const krb5_data *realm,
                             const char *service,
                             const char *protocol,
                             struct srv_dns_entry **answers);
void krb5int_free_srv_dns_data(struct srv_dns_entry *);
#endif

/* value to use when requesting a keytab entry and KVNO doesn't matter */
#define IGNORE_VNO 0
/* value to use when requesting a keytab entry and enctype doesn't matter */
#define IGNORE_ENCTYPE 0

/*
 * Convenience function for structure magic number
 */
#define KRB5_VERIFY_MAGIC(structure,magic_number)                       \
    if ((structure)->magic != (magic_number)) return (magic_number);

/* to keep lint happy */
#define krb5_xfree(val) free((char *)(val))

/* To keep happy libraries which are (for now) accessing internal stuff */

/* Make sure to increment by one when changing the struct */
#define KRB5INT_ACCESS_STRUCT_VERSION 16

#ifndef ANAME_SZ
struct ktext;                   /* from krb.h, for krb524 support */
#endif
typedef struct _krb5int_access {
    /* crypto stuff */
    krb5_error_code (*arcfour_gsscrypt)(const krb5_keyblock *keyblock,
                                        krb5_keyusage usage,
                                        const krb5_data *kd_data,
                                        krb5_crypto_iov *data,
                                        size_t num_data);

    krb5_error_code (*auth_con_get_subkey_enctype)(krb5_context,
                                                   krb5_auth_context,
                                                   krb5_enctype *);
    /* service location and communication */
    krb5_error_code (*sendto_udp)(krb5_context, const krb5_data *msg,
                                  const struct addrlist *,
                                  struct sendto_callback_info *,
                                  krb5_data *reply, struct sockaddr *,
                                  socklen_t *, struct sockaddr *,
                                  socklen_t *, int *,
                                  int (*msg_handler)(krb5_context,
                                                     const krb5_data *,
                                                     void *),
                                  void *msg_handler_data);
    krb5_error_code (*add_host_to_list)(struct addrlist *lp,
                                        const char *hostname,
                                        int port, int secport,
                                        int socktype, int family);
    void (*free_addrlist)(struct addrlist *);

    krb5_error_code (*make_srv_query_realm)(const krb5_data *realm,
                                            const char *service,
                                            const char *protocol,
                                            struct srv_dns_entry **answers);
    void (*free_srv_dns_data)(struct srv_dns_entry *);
    int (*use_dns_kdc)(krb5_context);
    krb5_error_code (*clean_hostname)(krb5_context, const char *, char *,
                                      size_t);

    krb5_error_code (*mandatory_cksumtype)(krb5_context, krb5_enctype,
                                           krb5_cksumtype *);
    krb5_error_code (KRB5_CALLCONV *ser_pack_int64)(krb5_int64, krb5_octet **,
                                                    size_t *);
    krb5_error_code (KRB5_CALLCONV *ser_unpack_int64)(krb5_int64 *,
                                                      krb5_octet **, size_t *);

    /* Used for KDB LDAP back end.  */
    krb5_error_code
    (*asn1_ldap_encode_sequence_of_keys)(const ldap_seqof_key_data *val,
                                         krb5_data **code);

    krb5_error_code
    (*asn1_ldap_decode_sequence_of_keys)(krb5_data *in,
                                         ldap_seqof_key_data **);

    /* Used for encrypted challenge fast factor*/
    krb5_error_code (*encode_enc_data)(const krb5_enc_data *, krb5_data **);
    krb5_error_code (*decode_enc_data)(const krb5_data *, krb5_enc_data **);
    void (*free_enc_data)(krb5_context, krb5_enc_data *);
    krb5_error_code (*encode_enc_ts)(const krb5_pa_enc_ts *, krb5_data **);
    krb5_error_code (*decode_enc_ts)(const krb5_data *, krb5_pa_enc_ts **);
    void (*free_enc_ts)(krb5_context, krb5_pa_enc_ts *);
    krb5_error_code
    (*encrypt_helper)(krb5_context, const krb5_keyblock *, krb5_keyusage,
                      const krb5_data *, krb5_enc_data *);

    /*
     * pkinit asn.1 encode/decode functions
     */
    krb5_error_code
    (*encode_krb5_auth_pack)(const krb5_auth_pack *rep, krb5_data **code);

    krb5_error_code
    (*encode_krb5_auth_pack_draft9)(const krb5_auth_pack_draft9 *rep,
                                    krb5_data **code);

    krb5_error_code
    (*encode_krb5_kdc_dh_key_info)(const krb5_kdc_dh_key_info *rep,
                                   krb5_data **code);

    krb5_error_code
    (*encode_krb5_pa_pk_as_rep)(const krb5_pa_pk_as_rep *rep,
                                krb5_data **code);

    krb5_error_code
    (*encode_krb5_pa_pk_as_rep_draft9)(const krb5_pa_pk_as_rep_draft9 *rep,
                                       krb5_data **code);

    krb5_error_code
    (*encode_krb5_pa_pk_as_req)(const krb5_pa_pk_as_req *rep,
                                krb5_data **code);

    krb5_error_code
    (*encode_krb5_pa_pk_as_req_draft9)(const krb5_pa_pk_as_req_draft9 *rep,
                                       krb5_data **code);

    krb5_error_code
    (*encode_krb5_reply_key_pack)(const krb5_reply_key_pack *,
                                  krb5_data **code);

    krb5_error_code
    (*encode_krb5_reply_key_pack_draft9)(const krb5_reply_key_pack_draft9 *,
                                         krb5_data **code);

    krb5_error_code
    (*encode_krb5_td_dh_parameters)(const krb5_algorithm_identifier **,
                                    krb5_data **code);

    krb5_error_code
    (*encode_krb5_td_trusted_certifiers)(const
                                         krb5_external_principal_identifier **,
                                         krb5_data **code);

    krb5_error_code
    (*encode_krb5_typed_data)(const krb5_typed_data **, krb5_data **code);

    krb5_error_code
    (*decode_krb5_auth_pack)(const krb5_data *, krb5_auth_pack **);

    krb5_error_code
    (*decode_krb5_auth_pack_draft9)(const krb5_data *,
                                    krb5_auth_pack_draft9 **);

    krb5_error_code
    (*decode_krb5_pa_pk_as_req)(const krb5_data *, krb5_pa_pk_as_req **);

    krb5_error_code
    (*decode_krb5_pa_pk_as_req_draft9)(const krb5_data *,
                                       krb5_pa_pk_as_req_draft9 **);

    krb5_error_code
    (*decode_krb5_pa_pk_as_rep)(const krb5_data *, krb5_pa_pk_as_rep **);

    krb5_error_code
    (*decode_krb5_pa_pk_as_rep_draft9)(const krb5_data *,
                                       krb5_pa_pk_as_rep_draft9 **);

    krb5_error_code
    (*decode_krb5_kdc_dh_key_info)(const krb5_data *, krb5_kdc_dh_key_info **);

    krb5_error_code
    (*decode_krb5_principal_name)(const krb5_data *, krb5_principal_data **);

    krb5_error_code
    (*decode_krb5_reply_key_pack)(const krb5_data *, krb5_reply_key_pack **);

    krb5_error_code
    (*decode_krb5_reply_key_pack_draft9)(const krb5_data *,
                                         krb5_reply_key_pack_draft9 **);

    krb5_error_code
    (*decode_krb5_td_dh_parameters)(const krb5_data *,
                                    krb5_algorithm_identifier ***);

    krb5_error_code
    (*decode_krb5_td_trusted_certifiers)(const krb5_data *,
                                         krb5_external_principal_identifier
                                         ***);

    krb5_error_code
    (*decode_krb5_typed_data)(const krb5_data *, krb5_typed_data ***);

    krb5_error_code
    (*decode_krb5_as_req)(const krb5_data *output, krb5_kdc_req **rep);

    krb5_error_code
    (*encode_krb5_kdc_req_body)(const krb5_kdc_req *rep, krb5_data **code);

    void
    (KRB5_CALLCONV *free_kdc_req)(krb5_context, krb5_kdc_req * );
    void
    (*set_prompt_types)(krb5_context, krb5_prompt_type *);

    krb5_error_code
    (*encode_krb5_authdata_elt)(const krb5_authdata *rep, krb5_data **code);

    /* Exported for testing only!  */
    krb5_error_code
    (*encode_krb5_sam_response_2)(const krb5_sam_response_2 *rep,
                                  krb5_data **code);
    krb5_error_code
    (*encode_krb5_enc_sam_response_enc_2)(const
                                          krb5_enc_sam_response_enc_2 *rep,
                                          krb5_data **code);
} krb5int_access;

#define KRB5INT_ACCESS_VERSION                                          \
    (((krb5_int32)((sizeof(krb5int_access) & 0xFFFF) |                  \
                   (KRB5INT_ACCESS_STRUCT_VERSION << 16))) & 0xFFFFFFFF)

krb5_error_code KRB5_CALLCONV
krb5int_accessor(krb5int_access*, krb5_int32);

/* Ick -- some krb524 and krb4 support placed in the krb5 library,
   because AFS (and potentially other applications?) use the krb4
   object as an opaque token, which (in some implementations) is not
   in fact a krb4 ticket, so we don't want to drag in the krb4 support
   just to enable this.  */

#define KRB524_SERVICE "krb524"
#define KRB524_PORT 4444

/* temporary -- this should be under lib/krb5/ccache somewhere */

struct _krb5_ccache {
    krb5_magic magic;
    const struct _krb5_cc_ops *ops;
    krb5_pointer data;
};

/*
 * Per-type ccache cursor.
 */
struct krb5_cc_ptcursor_s {
    const struct _krb5_cc_ops *ops;
    krb5_pointer data;
};
typedef struct krb5_cc_ptcursor_s *krb5_cc_ptcursor;

struct _krb5_cc_ops {
    krb5_magic magic;
    char *prefix;
    const char * (KRB5_CALLCONV *get_name)(krb5_context, krb5_ccache);
    krb5_error_code (KRB5_CALLCONV *resolve)(krb5_context, krb5_ccache *,
                                             const char *);
    krb5_error_code (KRB5_CALLCONV *gen_new)(krb5_context, krb5_ccache *);
    krb5_error_code (KRB5_CALLCONV *init)(krb5_context, krb5_ccache,
                                          krb5_principal);
    krb5_error_code (KRB5_CALLCONV *destroy)(krb5_context, krb5_ccache);
    krb5_error_code (KRB5_CALLCONV *close)(krb5_context, krb5_ccache);
    krb5_error_code (KRB5_CALLCONV *store)(krb5_context, krb5_ccache,
                                           krb5_creds *);
    krb5_error_code (KRB5_CALLCONV *retrieve)(krb5_context, krb5_ccache,
                                              krb5_flags, krb5_creds *,
                                              krb5_creds *);
    krb5_error_code (KRB5_CALLCONV *get_princ)(krb5_context, krb5_ccache,
                                               krb5_principal *);
    krb5_error_code (KRB5_CALLCONV *get_first)(krb5_context, krb5_ccache,
                                               krb5_cc_cursor *);
    krb5_error_code (KRB5_CALLCONV *get_next)(krb5_context, krb5_ccache,
                                              krb5_cc_cursor *, krb5_creds *);
    krb5_error_code (KRB5_CALLCONV *end_get)(krb5_context, krb5_ccache,
                                             krb5_cc_cursor *);
    krb5_error_code (KRB5_CALLCONV *remove_cred)(krb5_context, krb5_ccache,
                                                 krb5_flags, krb5_creds *);
    krb5_error_code (KRB5_CALLCONV *set_flags)(krb5_context, krb5_ccache,
                                               krb5_flags);
    krb5_error_code (KRB5_CALLCONV *get_flags)(krb5_context, krb5_ccache,
                                               krb5_flags *);
    krb5_error_code (KRB5_CALLCONV *ptcursor_new)(krb5_context,
                                                  krb5_cc_ptcursor *);
    krb5_error_code (KRB5_CALLCONV *ptcursor_next)(krb5_context,
                                                   krb5_cc_ptcursor,
                                                   krb5_ccache *);
    krb5_error_code (KRB5_CALLCONV *ptcursor_free)(krb5_context,
                                                   krb5_cc_ptcursor *);
    krb5_error_code (KRB5_CALLCONV *move)(krb5_context, krb5_ccache,
                                          krb5_ccache);
    krb5_error_code (KRB5_CALLCONV *lastchange)(krb5_context,
                                                krb5_ccache, krb5_timestamp *);
    krb5_error_code (KRB5_CALLCONV *wasdefault)(krb5_context, krb5_ccache,
                                                krb5_timestamp *);
    krb5_error_code (KRB5_CALLCONV *lock)(krb5_context, krb5_ccache);
    krb5_error_code (KRB5_CALLCONV *unlock)(krb5_context, krb5_ccache);
};

extern const krb5_cc_ops *krb5_cc_dfl_ops;

krb5_error_code
krb5int_cc_os_default_name(krb5_context context, char **name);

typedef struct _krb5_donot_replay {
    krb5_magic magic;
    krb5_ui_4 hash;
    char *server;                       /* null-terminated */
    char *client;                       /* null-terminated */
    char *msghash;                      /* null-terminated */
    krb5_int32 cusec;
    krb5_timestamp ctime;
} krb5_donot_replay;

krb5_error_code krb5_rc_default(krb5_context, krb5_rcache *);
krb5_error_code krb5_rc_resolve_type(krb5_context, krb5_rcache *,char *);
krb5_error_code krb5_rc_resolve_full(krb5_context, krb5_rcache *,char *);
char *krb5_rc_get_type(krb5_context, krb5_rcache);
char *krb5_rc_default_type(krb5_context);
char *krb5_rc_default_name(krb5_context);
krb5_error_code krb5_auth_to_rep(krb5_context, krb5_tkt_authent *,
                                 krb5_donot_replay *);
krb5_error_code krb5_rc_hash_message(krb5_context context,
                                     const krb5_data *message, char **out);

krb5_error_code KRB5_CALLCONV
krb5_rc_initialize(krb5_context, krb5_rcache, krb5_deltat);

krb5_error_code KRB5_CALLCONV
krb5_rc_recover_or_initialize(krb5_context, krb5_rcache,krb5_deltat);

krb5_error_code KRB5_CALLCONV
krb5_rc_recover(krb5_context, krb5_rcache);

krb5_error_code KRB5_CALLCONV
krb5_rc_destroy(krb5_context, krb5_rcache);

krb5_error_code KRB5_CALLCONV
krb5_rc_close(krb5_context, krb5_rcache);

krb5_error_code KRB5_CALLCONV
krb5_rc_store(krb5_context, krb5_rcache, krb5_donot_replay *);

krb5_error_code KRB5_CALLCONV
krb5_rc_expunge(krb5_context, krb5_rcache);

krb5_error_code KRB5_CALLCONV
krb5_rc_get_lifespan(krb5_context, krb5_rcache,krb5_deltat *);

char *KRB5_CALLCONV
krb5_rc_get_name(krb5_context, krb5_rcache);

krb5_error_code KRB5_CALLCONV
krb5_rc_resolve(krb5_context, krb5_rcache, char *);

/*
 * This structure was exposed and used in macros in krb5 1.2, so do not
 * change its ABI.
 */
typedef struct _krb5_kt_ops {
    krb5_magic magic;
    char *prefix;

    /* routines always present */
    krb5_error_code (KRB5_CALLCONV *resolve)(krb5_context, const char *,
                                             krb5_keytab *);
    krb5_error_code (KRB5_CALLCONV *get_name)(krb5_context, krb5_keytab,
                                              char *, unsigned int);
    krb5_error_code (KRB5_CALLCONV *close)(krb5_context, krb5_keytab);
    krb5_error_code (KRB5_CALLCONV *get)(krb5_context, krb5_keytab,
                                         krb5_const_principal, krb5_kvno,
                                         krb5_enctype, krb5_keytab_entry *);
    krb5_error_code (KRB5_CALLCONV *start_seq_get)(krb5_context, krb5_keytab,
                                                   krb5_kt_cursor *);
    krb5_error_code (KRB5_CALLCONV *get_next)(krb5_context, krb5_keytab,
                                              krb5_keytab_entry *,
                                              krb5_kt_cursor *);
    krb5_error_code (KRB5_CALLCONV *end_get)(krb5_context, krb5_keytab,
                                             krb5_kt_cursor *);
    /* routines to be included on extended version (write routines) */
    krb5_error_code (KRB5_CALLCONV *add)(krb5_context, krb5_keytab,
                                         krb5_keytab_entry *);
    krb5_error_code (KRB5_CALLCONV *remove)(krb5_context, krb5_keytab,
                                            krb5_keytab_entry *);

    /* Handle for serializer */
    const krb5_ser_entry *serializer;
} krb5_kt_ops;

extern const krb5_kt_ops krb5_kt_dfl_ops;

extern krb5_error_code krb5int_translate_gai_error(int);

/* Not sure it's ready for exposure just yet.  */
extern krb5_error_code
krb5int_c_mandatory_cksumtype(krb5_context, krb5_enctype, krb5_cksumtype *);

extern int krb5int_crypto_init (void);
extern int krb5int_prng_init(void);
extern int krb5int_crypto_impl_init(void);

/*
 * Referral definitions, debugging hooks, and subfunctions.
 */
#define        KRB5_REFERRAL_MAXHOPS    10
/* #define DEBUG_REFERRALS */

#ifdef DEBUG_REFERRALS
void krb5int_dbgref_dump_principal(char *, krb5_principal);
#endif

/* Common hostname-parsing code. */
krb5_error_code KRB5_CALLCONV
krb5int_clean_hostname(krb5_context, const char *, char *, size_t);

krb5_error_code
krb5int_aes_encrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
                    size_t num_data);

krb5_error_code
krb5int_aes_decrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
                    size_t num_data);

krb5_error_code
krb5int_camellia_cbc_mac(krb5_key key, const krb5_crypto_iov *data,
                         size_t num_data, const krb5_data *iv,
                         krb5_data *output);

#if 0
/*
 * There are no IANA assignments for these enctypes or cksumtypes yet.  They
 * must be defined to local-use negative numbers at build time for Camellia
 * support to function at the moment.  If one is defined, they should all be
 * defined.  When IANA assignments exist, these definitions should move to the
 * appropriate places in krb5.hin and all CAMELLIA conditional code should be
 * made unconditional.
 *
 * The present code is experimental and may not be compatible with the
 * standardized version.
 */
#define ENCTYPE_CAMELLIA128_CTS_CMAC -XXX /* Camellia CTS mode, 128-bit key */
#define ENCTYPE_CAMELLIA256_CTS_CMAC -YYY /* Camellia CTS mode, 256-bit key */
#define CKSUMTYPE_CMAC_CAMELLIA128 -XXX   /* CMAC, 128-bit Camellia key */
#define CKSUMTYPE_CMAC_CAMELLIA256 -YYY   /* CMAC, 256-bit Camellia key */
#endif

#ifdef ENCTYPE_CAMELLIA128_CTS_CMAC
#define CAMELLIA
#endif

struct _krb5_kt {       /* should move into k5-int.h */
    krb5_magic magic;
    const struct _krb5_kt_ops *ops;
    krb5_pointer data;
};

krb5_error_code krb5_set_default_in_tkt_ktypes(krb5_context,
                                               const krb5_enctype *);

krb5_error_code krb5_get_default_in_tkt_ktypes(krb5_context, krb5_enctype **);

krb5_error_code krb5_set_default_tgs_ktypes(krb5_context,
                                            const krb5_enctype *);

krb5_error_code KRB5_CALLCONV
krb5_get_tgs_ktypes(krb5_context, krb5_const_principal, krb5_enctype **);

void KRB5_CALLCONV krb5_free_ktypes(krb5_context, krb5_enctype *);

krb5_boolean krb5_is_permitted_enctype(krb5_context, krb5_enctype);

typedef struct
{
    krb5_enctype *etype;
    krb5_boolean *etype_ok;
    krb5_int32 etype_count;
} krb5_etypes_permitted;

krb5_boolean krb5_is_permitted_enctype_ext(krb5_context,
                                           krb5_etypes_permitted *);

krb5_boolean KRB5_CALLCONV krb5int_c_weak_enctype(krb5_enctype);

krb5_error_code krb5_kdc_rep_decrypt_proc(krb5_context, const krb5_keyblock *,
                                          krb5_const_pointer, krb5_kdc_rep *);
krb5_error_code KRB5_CALLCONV krb5_decrypt_tkt_part(krb5_context,
                                                    const krb5_keyblock *,
                                                    krb5_ticket * );

krb5_error_code krb5_get_cred_via_tkt(krb5_context, krb5_creds *, krb5_flags,
                                      krb5_address *const *, krb5_creds *,
                                      krb5_creds **);

krb5_error_code KRB5_CALLCONV krb5_copy_addr(krb5_context,
                                             const krb5_address *,
                                             krb5_address **);

void krb5_init_ets(krb5_context);
void krb5_free_ets(krb5_context);
krb5_error_code krb5_generate_subkey(krb5_context, const krb5_keyblock *,
                                     krb5_keyblock **);
krb5_error_code krb5_generate_subkey_extended(krb5_context,
                                              const krb5_keyblock *,
                                              krb5_enctype, krb5_keyblock **);
krb5_error_code krb5_generate_seq_number(krb5_context, const krb5_keyblock *,
                                         krb5_ui_4 *);

krb5_error_code KRB5_CALLCONV krb5_kt_register(krb5_context,
                                               const struct _krb5_kt_ops *);

krb5_error_code krb5_principal2salt_norealm(krb5_context, krb5_const_principal,
                                            krb5_data *);

unsigned int KRB5_CALLCONV krb5_get_notification_message(void);

/* chk_trans.c */
krb5_error_code krb5_check_transited_list(krb5_context, const krb5_data *trans,
                                          const krb5_data *realm1,
                                          const krb5_data *realm2);

/* free_rtree.c */
void krb5_free_realm_tree(krb5_context, krb5_principal *);

void KRB5_CALLCONV krb5_free_authenticator_contents(krb5_context,
                                                    krb5_authenticator *);

void KRB5_CALLCONV krb5_free_address(krb5_context, krb5_address *);

void KRB5_CALLCONV krb5_free_enc_tkt_part(krb5_context, krb5_enc_tkt_part *);

void KRB5_CALLCONV krb5_free_tickets(krb5_context, krb5_ticket **);
void KRB5_CALLCONV krb5_free_kdc_req(krb5_context, krb5_kdc_req *);
void KRB5_CALLCONV krb5_free_kdc_rep(krb5_context, krb5_kdc_rep *);
void KRB5_CALLCONV krb5_free_last_req(krb5_context, krb5_last_req_entry **);
void KRB5_CALLCONV krb5_free_enc_kdc_rep_part(krb5_context,
                                              krb5_enc_kdc_rep_part *);
void KRB5_CALLCONV krb5_free_ap_req(krb5_context, krb5_ap_req *);
void KRB5_CALLCONV krb5_free_ap_rep(krb5_context, krb5_ap_rep *);
void KRB5_CALLCONV krb5_free_cred(krb5_context, krb5_cred *);
void KRB5_CALLCONV krb5_free_cred_enc_part(krb5_context, krb5_cred_enc_part *);
void KRB5_CALLCONV krb5_free_pa_data(krb5_context, krb5_pa_data **);
void KRB5_CALLCONV krb5_free_tkt_authent(krb5_context, krb5_tkt_authent *);
void KRB5_CALLCONV krb5_free_pwd_data(krb5_context, krb5_pwd_data *);
void KRB5_CALLCONV krb5_free_pwd_sequences(krb5_context,
                                           passwd_phrase_element **);
void KRB5_CALLCONV krb5_free_passwd_phrase_element(krb5_context,
                                                   passwd_phrase_element *);
void KRB5_CALLCONV krb5_free_alt_method(krb5_context, krb5_alt_method *);
void KRB5_CALLCONV krb5_free_enc_data(krb5_context, krb5_enc_data *);
krb5_error_code krb5_set_config_files(krb5_context, const char **);

krb5_error_code KRB5_CALLCONV krb5_get_default_config_files(char ***filenames);

void KRB5_CALLCONV krb5_free_config_files(char **filenames);

krb5_error_code krb5int_find_authdata(krb5_context context,
                                      krb5_authdata *const *ticket_authdata,
                                      krb5_authdata *const *ap_req_authdata,
                                      krb5_authdatatype ad_type,
                                      krb5_authdata ***results);

krb5_error_code krb5_rd_req_decoded(krb5_context, krb5_auth_context *,
                                    const krb5_ap_req *, krb5_const_principal,
                                    krb5_keytab, krb5_flags *, krb5_ticket **);

krb5_error_code krb5_rd_req_decoded_anyflag(krb5_context, krb5_auth_context *,
                                            const krb5_ap_req *,
                                            krb5_const_principal, krb5_keytab,
                                            krb5_flags *, krb5_ticket **);

krb5_error_code KRB5_CALLCONV
krb5_cc_register(krb5_context, const krb5_cc_ops *, krb5_boolean );

krb5_error_code krb5_walk_realm_tree(krb5_context, const krb5_data *,
                                     const krb5_data *, krb5_principal **,
                                     int);

krb5_error_code
krb5_auth_con_set_safe_cksumtype(krb5_context, krb5_auth_context,
                                 krb5_cksumtype);

krb5_error_code krb5_auth_con_setivector(krb5_context, krb5_auth_context,
                                         krb5_pointer);

krb5_error_code krb5_auth_con_getivector(krb5_context, krb5_auth_context,
                                         krb5_pointer *);

krb5_error_code krb5_auth_con_setpermetypes(krb5_context, krb5_auth_context,
                                            const krb5_enctype *);

krb5_error_code krb5_auth_con_getpermetypes(krb5_context, krb5_auth_context,
                                            krb5_enctype **);

krb5_error_code krb5_auth_con_get_subkey_enctype(krb5_context context,
                                                 krb5_auth_context,
                                                 krb5_enctype *);

krb5_error_code
krb5_auth_con_get_authdata_context(krb5_context context,
                                   krb5_auth_context auth_context,
                                   krb5_authdata_context *ad_context);

krb5_error_code
krb5_auth_con_set_authdata_context(krb5_context context,
                                   krb5_auth_context auth_context,
                                   krb5_authdata_context ad_context);

krb5_error_code KRB5_CALLCONV
krb5int_server_decrypt_ticket_keyblock(krb5_context context,
                                       const krb5_keyblock *key,
                                       krb5_ticket  *ticket);

krb5_error_code krb5_read_message(krb5_context, krb5_pointer, krb5_data *);
krb5_error_code krb5_write_message(krb5_context, krb5_pointer, krb5_data *);
krb5_error_code krb5int_write_messages(krb5_context, krb5_pointer, krb5_data *,
                                       int);
int krb5_net_read(krb5_context, int , char *, int);
int krb5_net_write(krb5_context, int , const char *, int);

krb5_error_code KRB5_CALLCONV krb5_get_realm_domain(krb5_context,
                                                    const char *, char ** );

krb5_error_code krb5_gen_portaddr(krb5_context, const krb5_address *,
                                  krb5_const_pointer, krb5_address **);

krb5_error_code krb5_gen_replay_name(krb5_context, const krb5_address *,
                                     const char *, char **);
krb5_error_code krb5_make_fulladdr(krb5_context, krb5_address *,
                                   krb5_address *, krb5_address *);

krb5_error_code krb5_set_debugging_time(krb5_context, krb5_timestamp,
                                        krb5_int32);
krb5_error_code krb5_use_natural_time(krb5_context);
krb5_error_code krb5_set_time_offsets(krb5_context, krb5_timestamp,
                                      krb5_int32);
krb5_error_code krb5int_check_clockskew(krb5_context, krb5_timestamp);
/*
 * The realm iterator functions
 */

krb5_error_code KRB5_CALLCONV
krb5_realm_iterator_create(krb5_context context, void **iter_p);

krb5_error_code KRB5_CALLCONV
krb5_realm_iterator(krb5_context context, void **iter_p, char **ret_realm);

void KRB5_CALLCONV
krb5_realm_iterator_free(krb5_context context, void **iter_p);

void KRB5_CALLCONV krb5_free_realm_string(krb5_context context, char *str);

/* Internal principal function used by KIM to avoid code duplication */
krb5_error_code KRB5_CALLCONV
krb5int_build_principal_alloc_va(krb5_context context,
                                 krb5_principal *princ,
                                 unsigned int rlen,
                                 const char *realm,
                                 const char *first,
                                 va_list ap);

/* Some data comparison and conversion functions.  */
static inline int
data_eq(krb5_data d1, krb5_data d2)
{
    return (d1.length == d2.length
            && !memcmp(d1.data, d2.data, d1.length));
}

static inline krb5_data
make_data(void *data, unsigned int len)
{
    krb5_data d;

    d.magic = KV5M_DATA;
    d.data = (char *) data;
    d.length = len;
    return d;
}

static inline krb5_data
empty_data()
{
    return make_data(NULL, 0);
}

static inline krb5_data
string2data(char *str)
{
    return make_data(str, strlen(str));
}

static inline krb5_error_code
alloc_data(krb5_data *data, unsigned int len)
{
    /* Allocate at least one byte since zero-byte allocs may return NULL. */
    char *ptr = (char *) calloc((len > 0) ? len : 1, 1);

    if (ptr == NULL)
        return ENOMEM;
    data->magic = KV5M_DATA;
    data->data = ptr;
    data->length = len;
    return 0;
}

static inline int
data_eq_string (krb5_data d, char *s)
{
    return data_eq(d, string2data(s));
}

static inline int
authdata_eq(krb5_authdata a1, krb5_authdata a2)
{
    return (a1.ad_type == a2.ad_type
            && a1.length == a2.length
            && !memcmp(a1.contents, a2.contents, a1.length));
}

/* Allocate zeroed memory; set *code to 0 on success or ENOMEM on failure. */
static inline void *
k5alloc(size_t len, krb5_error_code *code)
{
    void *ptr;

    /* Allocate at least one byte since zero-byte allocs may return NULL. */
    ptr = calloc((len > 0) ? len : 1, 1);
    *code = (ptr == NULL) ? ENOMEM : 0;
    return ptr;
}

krb5_error_code KRB5_CALLCONV
krb5int_pac_sign(krb5_context context,
                 krb5_pac pac,
                 krb5_timestamp authtime,
                 krb5_const_principal principal,
                 const krb5_keyblock *server_key,
                 const krb5_keyblock *privsvr_key,
                 krb5_data *data);

krb5_error_code KRB5_CALLCONV
krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
                              krb5_ccache ccache,
                              krb5_creds *in_creds,
                              krb5_data *cert,
                              krb5_creds **out_creds);

krb5_error_code KRB5_CALLCONV
krb5_get_credentials_for_proxy(krb5_context context,
                               krb5_flags options,
                               krb5_ccache ccache,
                               krb5_creds *in_creds,
                               krb5_ticket *evidence_tkt,
                               krb5_creds **out_creds);

krb5_error_code KRB5_CALLCONV
krb5int_get_authdata_containee_types(krb5_context context,
                                     const krb5_authdata *container,
                                     unsigned int *nad_types,
                                     krb5_authdatatype **ad_types);

krb5_error_code krb5int_parse_enctype_list(krb5_context context, char *profstr,
                                           krb5_enctype *default_list,
                                           krb5_enctype **result);

#ifdef DEBUG_ERROR_LOCATIONS
#define krb5_set_error_message(ctx, code, ...)                          \
    krb5_set_error_message_fl(ctx, code, __FILE__, __LINE__, __VA_ARGS__)
#endif

#ifndef DISABLE_TRACING
/* Do not use these functions directly; see k5-trace.h. */
void krb5int_init_trace(krb5_context context);
void krb5int_trace(krb5_context context, const char *fmt, ...);
#endif

#endif /* _KRB5_INT_H */