/*
- * $Source$
- * $Author$
+ * lib/krb5/krb/get_in_tkt.c
*
- * Copyright 1990 by the Massachusetts Institute of Technology.
+ * Copyright 1990,1991 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
*
- * For copying and distribution information, please see the file
- * <krb5/copyright.h>.
+ * 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 M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission. Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is" without express
+ * or implied warranty.
+ *
*
* krb5_get_in_tkt()
*/
-#if !defined(lint) && !defined(SABER)
-static char rcsid_get_in_tkt_c[] =
-"$Id$";
-#endif /* !lint & !SABER */
+#include <string.h>
-#include <krb5/copyright.h>
-#include <krb5/krb5.h>
-#include <krb5/asn1.h>
-#include <krb5/libos-proto.h>
-#include <krb5/ext-proto.h>
+#include "k5-int.h"
/*
All-purpose initial ticket routine, usually called via
Attempts to get an initial ticket for creds->client to use server
creds->server, (realm is taken from creds->client), with options
- options, requesting encryption type etype, and using
- creds->times.starttime, creds->times.endtime, creds->times.renew_till
- as from, till, and rtime. creds->times.renew_till is ignored unless
- the RENEWABLE option is requested.
+ options, and using creds->times.starttime, creds->times.endtime,
+ creds->times.renew_till as from, till, and rtime.
+ creds->times.renew_till is ignored unless the RENEWABLE option is requested.
key_proc is called to fill in the key to be used for decryption.
keyseed is passed on to key_proc.
*/
-extern krb5_deltat krb5_clockskew;
-#define in_clock_skew(date) (abs((date)-request.nonce) < krb5_clockskew)
-
/* some typedef's for the function args to make things look a bit cleaner */
-/* widen this prototype if need be */
-#include <krb5/widen.h>
-typedef krb5_error_code (*git_key_proc) PROTOTYPE((const krb5_keytype,
- krb5_keyblock **,
+typedef krb5_error_code (*git_key_proc) PROTOTYPE((krb5_context,
+ const krb5_enctype,
+ krb5_data *,
krb5_const_pointer,
- krb5_pa_data **));
-#include <krb5/narrow.h>
+ krb5_keyblock **));
-typedef krb5_error_code (*git_decrypt_proc) PROTOTYPE((const krb5_keyblock *,
+typedef krb5_error_code (*git_decrypt_proc) PROTOTYPE((krb5_context,
+ const krb5_keyblock *,
krb5_const_pointer,
krb5_kdc_rep * ));
-krb5_error_code
-krb5_get_in_tkt(DECLARG(const krb5_flags, options),
- DECLARG(krb5_address * const *, addrs),
- DECLARG(const krb5_enctype, etype),
- DECLARG(const krb5_keytype, keytype),
- DECLARG(git_key_proc, key_proc),
- DECLARG(krb5_const_pointer, keyseed),
- DECLARG(git_decrypt_proc, decrypt_proc),
- DECLARG(krb5_const_pointer, decryptarg),
- DECLARG(krb5_creds *, creds),
- DECLARG(krb5_ccache, ccache))
-OLDDECLARG(const krb5_flags, options)
-OLDDECLARG(krb5_address * const *, addrs)
-OLDDECLARG(const krb5_enctype, etype)
-OLDDECLARG(const krb5_keytype, keytype)
-OLDDECLARG(git_key_proc, key_proc)
-OLDDECLARG(krb5_const_pointer, keyseed)
-OLDDECLARG(git_decrypt_proc, decrypt_proc)
-OLDDECLARG(krb5_const_pointer, decryptarg)
-OLDDECLARG(krb5_creds *, creds)
-OLDDECLARG(krb5_ccache, ccache)
+
+static krb5_error_code make_preauth_list PROTOTYPE((krb5_context,
+ krb5_preauthtype *,
+ int, krb5_pa_data ***));
+/*
+ * This function sends a request to the KDC, and gets back a response;
+ * the response is parsed into ret_err_reply or ret_as_reply if the
+ * reponse is a KRB_ERROR or a KRB_AS_REP packet. If it is some other
+ * unexpected response, an error is returned.
+ */
+static krb5_error_code
+send_as_request(context, request, time_now, ret_err_reply, ret_as_reply,
+ use_master)
+ krb5_context context;
+ krb5_kdc_req *request;
+ krb5_timestamp *time_now;
+ krb5_error ** ret_err_reply;
+ krb5_kdc_rep ** ret_as_reply;
+ int use_master;
{
- krb5_kdc_req request;
- krb5_kdc_rep *as_reply;
- krb5_error *err_reply;
+ krb5_kdc_rep *as_reply = 0;
krb5_error_code retval;
krb5_data *packet;
krb5_data reply;
- krb5_keyblock *decrypt_key;
- krb5_enctype etypes[1];
- krb5_timestamp time_now;
-
- request.msg_type = KRB5_AS_REQ;
-
- /* AS_REQ has no pre-authentication. */
- request.padata = 0;
-
- request.kdc_options = options;
- request.client = creds->client;
- request.server = creds->server;
-
- request.from = creds->times.starttime;
- request.till = creds->times.endtime;
- request.rtime = creds->times.renew_till;
- if (retval = krb5_timeofday(&time_now))
- return(retval);
+ char k4_version; /* same type as *(krb5_data::data) */
- /* XXX we know they are the same size... */
- request.nonce = (krb5_int32) time_now;
+ reply.data = 0;
+
+ if ((retval = krb5_timeofday(context, time_now)))
+ goto cleanup;
- etypes[0] = etype;
- request.etype = etypes;
- request.netypes = 1;
- request.addresses = (krb5_address **) addrs;
- request.second_ticket = 0;
- request.authorization_data.ciphertext.length = 0;
- request.authorization_data.ciphertext.data = 0;
- request.unenc_authdata = 0;
+ /*
+ * XXX we know they are the same size... and we should do
+ * something better than just the current time
+ */
+ request->nonce = (krb5_int32) *time_now;
/* encode & send to KDC */
- if (retval = encode_krb5_as_req(&request, &packet))
- return(retval);
- retval = krb5_sendto_kdc(packet, krb5_princ_realm(creds->client), &reply);
- krb5_free_data(packet);
+ if ((retval = encode_krb5_as_req(request, &packet)) != 0)
+ goto cleanup;
+
+ k4_version = packet->data[0];
+ retval = krb5_sendto_kdc(context, packet,
+ krb5_princ_realm(context, request->client),
+ &reply, use_master);
+ krb5_free_data(context, packet);
if (retval)
- return(retval);
+ goto cleanup;
/* now decode the reply...could be error or as_rep */
-
if (krb5_is_krb_error(&reply)) {
- if (retval = decode_krb5_error(&reply, &err_reply))
- return retval; /* some other reply--??? */
- /* it was an error */
-
- if ((err_reply->ctime != request.nonce) ||
- !krb5_principal_compare(err_reply->server, request.server) ||
- !krb5_principal_compare(err_reply->client, request.client))
- retval = KRB5_KDCREP_MODIFIED;
+ krb5_error *err_reply;
+
+ if ((retval = decode_krb5_error(&reply, &err_reply)))
+ /* some other error code--??? */
+ goto cleanup;
+
+ if (ret_err_reply)
+ *ret_err_reply = err_reply;
else
- retval = err_reply->error + ERROR_TABLE_BASE_krb5;
+ krb5_free_error(context, err_reply);
+ goto cleanup;
+ }
+
+ /*
+ * Check to make sure it isn't a V4 reply.
+ */
+ if (!krb5_is_as_rep(&reply)) {
+/* these are in <kerberosIV/prot.h> as well but it isn't worth including. */
+#define V4_KRB_PROT_VERSION 4
+#define V4_AUTH_MSG_ERR_REPLY (5<<1)
+ /* check here for V4 reply */
+ unsigned int t_switch;
+
+ /* From v4 g_in_tkt.c: This used to be
+ switch (pkt_msg_type(rpkt) & ~1) {
+ but SCO 3.2v4 cc compiled that incorrectly. */
+ t_switch = reply.data[1];
+ t_switch &= ~1;
- /* XXX somehow make error msg text available to application? */
+ if (t_switch == V4_AUTH_MSG_ERR_REPLY
+ && (reply.data[0] == V4_KRB_PROT_VERSION
+ || reply.data[0] == k4_version)) {
+ retval = KRB5KRB_AP_ERR_V4_REPLY;
+ } else {
+ retval = KRB5KRB_AP_ERR_MSG_TYPE;
+ }
+ goto cleanup;
+ }
+
+ /* It must be a KRB_AS_REP message, or an bad returned packet */
+ if ((retval = decode_krb5_as_rep(&reply, &as_reply)))
+ /* some other error code ??? */
+ goto cleanup;
- krb5_free_error(err_reply);
- return retval;
+ if (as_reply->msg_type != KRB5_AS_REP) {
+ retval = KRB5KRB_AP_ERR_MSG_TYPE;
+ krb5_free_kdc_rep(context, as_reply);
+ goto cleanup;
}
- if (!krb5_is_as_rep(&reply))
- return KRB5KRB_AP_ERR_MSG_TYPE;
- if (retval = decode_krb5_as_rep(&reply, &as_reply))
- return retval; /* some other reply--??? */
+ if (ret_as_reply)
+ *ret_as_reply = as_reply;
+ else
+ krb5_free_kdc_rep(context, as_reply);
- if (as_reply->msg_type != KRB5_AS_REP)
- return KRB5KRB_AP_ERR_MSG_TYPE;
+cleanup:
+ if (reply.data)
+ free(reply.data);
+ return retval;
+}
- /* it was a kdc_rep--decrypt & check */
+static krb5_error_code
+decrypt_as_reply(context, request, as_reply, key_proc, keyseed, key,
+ decrypt_proc, decryptarg)
+ krb5_context context;
+ krb5_kdc_req *request;
+ krb5_kdc_rep *as_reply;
+ git_key_proc key_proc;
+ krb5_const_pointer keyseed;
+ krb5_keyblock * key;
+ git_decrypt_proc decrypt_proc;
+ krb5_const_pointer decryptarg;
+{
+ krb5_error_code retval;
+ krb5_keyblock * decrypt_key = 0;
+ krb5_data salt;
+
+ if (as_reply->enc_part2)
+ return 0;
- /* generate the key */
- if (retval = (*key_proc)(keytype, &decrypt_key, keyseed,
- as_reply->padata)) {
- krb5_free_kdc_rep(as_reply);
- return retval;
- }
+ if (key)
+ decrypt_key = key;
+ else {
+ if ((retval = krb5_principal2salt(context, request->client, &salt)))
+ return(retval);
- retval = (*decrypt_proc)(decrypt_key, decryptarg, as_reply);
- memset((char *)decrypt_key->contents, 0, decrypt_key->length);
- krb5_free_keyblock(decrypt_key);
- if (retval) {
- krb5_free_kdc_rep(as_reply);
- return retval;
+ retval = (*key_proc)(context, as_reply->enc_part.enctype,
+ &salt, keyseed, &decrypt_key);
+ krb5_xfree(salt.data);
+ if (retval)
+ goto cleanup;
}
+
+ if ((retval = (*decrypt_proc)(context, decrypt_key, decryptarg, as_reply)))
+ goto cleanup;
+
+cleanup:
+ if (!key && decrypt_key)
+ krb5_free_keyblock(context, decrypt_key);
+ return (retval);
+}
+static krb5_error_code
+verify_as_reply(context, time_now, request, as_reply)
+ krb5_context context;
+ krb5_timestamp time_now;
+ krb5_kdc_req *request;
+ krb5_kdc_rep *as_reply;
+{
+ krb5_error_code retval;
+
/* check the contents for sanity: */
if (!as_reply->enc_part2->times.starttime)
as_reply->enc_part2->times.starttime =
as_reply->enc_part2->times.authtime;
- if (!krb5_principal_compare(as_reply->client, request.client)
- || !krb5_principal_compare(as_reply->enc_part2->server, request.server)
- || !krb5_principal_compare(as_reply->ticket->server, request.server)
- || (request.nonce != as_reply->enc_part2->nonce)
+
+ if (!krb5_principal_compare(context, as_reply->client, request->client)
+ || !krb5_principal_compare(context, as_reply->enc_part2->server, request->server)
+ || !krb5_principal_compare(context, as_reply->ticket->server, request->server)
+ || (request->nonce != as_reply->enc_part2->nonce)
/* XXX check for extraneous flags */
- /* XXX || (!krb5_addresses_compare(addrs, as_reply->enc_part2->caddrs)) */
- || ((request.from == 0) &&
- !in_clock_skew(as_reply->enc_part2->times.starttime))
- || ((request.from != 0) &&
- (request.from != as_reply->enc_part2->times.starttime))
- || ((request.till != 0) &&
- (as_reply->enc_part2->times.endtime > request.till))
- || ((request.kdc_options & KDC_OPT_RENEWABLE) &&
- (request.rtime != 0) &&
- (as_reply->enc_part2->times.renew_till > request.rtime))
- || ((request.kdc_options & KDC_OPT_RENEWABLE_OK) &&
+ /* XXX || (!krb5_addresses_compare(context, addrs, as_reply->enc_part2->caddrs)) */
+ || ((request->kdc_options & KDC_OPT_POSTDATED) &&
+ (request->from != 0) &&
+ (request->from != as_reply->enc_part2->times.starttime))
+ || ((request->till != 0) &&
+ (as_reply->enc_part2->times.endtime > request->till))
+ || ((request->kdc_options & KDC_OPT_RENEWABLE) &&
+ (request->rtime != 0) &&
+ (as_reply->enc_part2->times.renew_till > request->rtime))
+ || ((request->kdc_options & KDC_OPT_RENEWABLE_OK) &&
(as_reply->enc_part2->flags & KDC_OPT_RENEWABLE) &&
- (request.till != 0) &&
- (as_reply->enc_part2->times.renew_till > request.till))
- ) {
- memset((char *)as_reply->enc_part2->session->contents, 0,
- as_reply->enc_part2->session->length);
- krb5_free_kdc_rep(as_reply);
+ (request->till != 0) &&
+ (as_reply->enc_part2->times.renew_till > request->till))
+ )
return KRB5_KDCREP_MODIFIED;
+
+ if (context->library_options & KRB5_LIBOPT_SYNC_KDCTIME) {
+ retval = krb5_set_real_time(context,
+ as_reply->enc_part2->times.authtime, 0);
+ if (retval)
+ return retval;
+ } else {
+ if ((request->from == 0) &&
+ (labs(as_reply->enc_part2->times.starttime - time_now)
+ > context->clockskew))
+ return (KRB5_KDCREP_SKEW);
}
+ return 0;
+}
+
+static krb5_error_code
+stash_as_reply(context, time_now, request, as_reply, creds, ccache)
+ krb5_context context;
+ krb5_timestamp time_now;
+ krb5_kdc_req *request;
+ krb5_kdc_rep *as_reply;
+ krb5_creds * creds;
+ krb5_ccache ccache;
+{
+ krb5_error_code retval;
+ krb5_data * packet;
+ krb5_principal client;
+ krb5_principal server;
+
+ client = NULL;
+ server = NULL;
+
+ if (!creds->client)
+ if (retval = krb5_copy_principal(context, as_reply->client, &client))
+ goto cleanup;
+
+ if (!creds->server)
+ if (retval = krb5_copy_principal(context, as_reply->enc_part2->server,
+ &server))
+ goto cleanup;
- /* XXX issue warning if as_reply->enc_part2->key_exp is nearby */
-
/* fill in the credentials */
- if (retval = krb5_copy_keyblock(as_reply->enc_part2->session,
- &creds->keyblock)) {
- memset((char *)as_reply->enc_part2->session->contents, 0,
- as_reply->enc_part2->session->length);
- krb5_free_kdc_rep(as_reply);
- return retval;
- }
-#define cleanup_key() {memset((char *)creds->keyblock.contents, 0,\
- creds->keyblock.length); \
- free((char *)creds->keyblock.contents); \
- creds->keyblock.contents = 0; \
- creds->keyblock.length = 0;}
+ if ((retval = krb5_copy_keyblock_contents(context,
+ as_reply->enc_part2->session,
+ &creds->keyblock)))
+ goto cleanup;
creds->times = as_reply->enc_part2->times;
creds->is_skey = FALSE; /* this is an AS_REQ, so cannot
be encrypted in skey */
creds->ticket_flags = as_reply->enc_part2->flags;
- if (retval = krb5_copy_addresses(as_reply->enc_part2->caddrs,
- &creds->addresses)) {
- cleanup_key();
- return retval;
- }
+ if ((retval = krb5_copy_addresses(context, as_reply->enc_part2->caddrs,
+ &creds->addresses)))
+ goto cleanup;
+
creds->second_ticket.length = 0;
creds->second_ticket.data = 0;
- retval = encode_krb5_ticket(as_reply->ticket, &packet);
- krb5_free_kdc_rep(as_reply);
- if (retval) {
- krb5_free_address(creds->addresses);
- cleanup_key();
- return retval;
- }
+ if ((retval = encode_krb5_ticket(as_reply->ticket, &packet)))
+ goto cleanup;
+
creds->ticket = *packet;
- free((char *) packet);
+ krb5_xfree(packet);
/* store it in the ccache! */
- if (retval = krb5_cc_store_cred(ccache, creds)) {
- /* clean up the pieces */
- free((char *)creds->ticket.data);
- krb5_free_address(creds->addresses);
- cleanup_key();
- return retval;
+ if (ccache)
+ if ((retval = krb5_cc_store_cred(context, ccache, creds)))
+ goto cleanup;
+
+ if (!creds->client)
+ creds->client = client;
+ if (!creds->server)
+ creds->server = server;
+
+cleanup:
+ if (retval) {
+ if (client)
+ krb5_free_principal(context, client);
+ if (server)
+ krb5_free_principal(context, server);
+ if (creds->keyblock.contents) {
+ memset((char *)creds->keyblock.contents, 0,
+ creds->keyblock.length);
+ krb5_xfree(creds->keyblock.contents);
+ creds->keyblock.contents = 0;
+ creds->keyblock.length = 0;
+ }
+ if (creds->ticket.data) {
+ krb5_xfree(creds->ticket.data);
+ creds->ticket.data = 0;
+ }
+ if (creds->addresses) {
+ krb5_free_addresses(context, creds->addresses);
+ creds->addresses = 0;
+ }
+ }
+ return (retval);
+}
+
+static krb5_error_code
+make_preauth_list(context, ptypes, nptypes, ret_list)
+ krb5_context context;
+ krb5_preauthtype * ptypes;
+ int nptypes;
+ krb5_pa_data *** ret_list;
+{
+ krb5_preauthtype * ptypep;
+ krb5_pa_data ** preauthp;
+ krb5_pa_data ** preauth_to_use;
+ int i;
+
+ if (nptypes < 0) {
+ for (nptypes=0, ptypep = ptypes; *ptypep; ptypep++, nptypes++)
+ ;
+ }
+
+ /* allocate space for a NULL to terminate the list */
+
+ if ((preauthp =
+ (krb5_pa_data **) malloc((nptypes+1)*sizeof(krb5_pa_data *))) == NULL)
+ return(ENOMEM);
+
+ for (i=0; i<nptypes; i++) {
+ if ((preauthp[i] =
+ (krb5_pa_data *) malloc(sizeof(krb5_pa_data))) == NULL) {
+ for (; i>=0; i++)
+ free(preauthp[i]);
+ free(preauthp);
+ return (ENOMEM);
+ }
+ preauthp[i]->magic = KV5M_PA_DATA;
+ preauthp[i]->pa_type = ptypes[i];
+ preauthp[i]->length = 0;
+ preauthp[i]->contents = 0;
+ }
+
+ /* fill in the terminating NULL */
+
+ preauthp[nptypes] = NULL;
+
+ *ret_list = preauthp;
+ return 0;
+}
+
+#define MAX_IN_TKT_LOOPS 16
+
+KRB5_DLLIMP krb5_error_code KRB5_CALLCONV
+krb5_get_in_tkt(context, options, addrs, ktypes, ptypes, key_proc, keyseed,
+ decrypt_proc, decryptarg, creds, ccache, ret_as_reply)
+ krb5_context context;
+ const krb5_flags options;
+ krb5_address FAR * const FAR * addrs;
+ krb5_enctype FAR * ktypes;
+ krb5_preauthtype FAR * ptypes;
+ git_key_proc key_proc;
+ krb5_const_pointer keyseed;
+ git_decrypt_proc decrypt_proc;
+ krb5_const_pointer decryptarg;
+ krb5_creds FAR * creds;
+ krb5_ccache ccache;
+ krb5_kdc_rep FAR * FAR * ret_as_reply;
+{
+ krb5_error_code retval;
+ krb5_timestamp time_now;
+ krb5_keyblock * decrypt_key = 0;
+ krb5_kdc_req request;
+ krb5_pa_data **padata = 0;
+ krb5_error * err_reply;
+ krb5_kdc_rep * as_reply = 0;
+ krb5_pa_data ** preauth_to_use = 0;
+ int loopcount = 0;
+ krb5_int32 do_more = 0;
+
+ if (! krb5_realm_compare(context, creds->client, creds->server))
+ return KRB5_IN_TKT_REALM_MISMATCH;
+
+ if (ret_as_reply)
+ *ret_as_reply = 0;
+
+ /*
+ * Set up the basic request structure
+ */
+ request.magic = KV5M_KDC_REQ;
+ request.msg_type = KRB5_AS_REQ;
+ request.addresses = 0;
+ request.ktype = 0;
+ request.padata = 0;
+ if (addrs)
+ request.addresses = (krb5_address **) addrs;
+ else
+ if ((retval = krb5_os_localaddr(context, &request.addresses)))
+ goto cleanup;
+ request.kdc_options = options;
+ request.client = creds->client;
+ request.server = creds->server;
+ request.from = creds->times.starttime;
+ request.till = creds->times.endtime;
+ request.rtime = creds->times.renew_till;
+ if ((retval = krb5_get_default_in_tkt_ktypes(context, &request.ktype)))
+ goto cleanup;
+ for (request.nktypes = 0;request.ktype[request.nktypes];request.nktypes++);
+ if (ktypes) {
+ int i, req, next = 0;
+ for (req = 0; ktypes[req]; req++) {
+ if (ktypes[req] == request.ktype[next]) {
+ next++;
+ continue;
+ }
+ for (i = next + 1; i < request.nktypes; i++)
+ if (ktypes[req] == request.ktype[i]) {
+ /* Found the enctype we want, but not in the
+ position we want. Move it, but keep the old
+ one from the desired slot around in case it's
+ later in our requested-ktypes list. */
+ krb5_enctype t;
+ t = request.ktype[next];
+ request.ktype[next] = request.ktype[i];
+ request.ktype[i] = t;
+ next++;
+ break;
+ }
+ /* If we didn't find it, don't do anything special, just
+ drop it. */
+ }
+ request.ktype[next] = 0;
+ request.nktypes = next;
+ }
+ request.authorization_data.ciphertext.length = 0;
+ request.authorization_data.ciphertext.data = 0;
+ request.unenc_authdata = 0;
+ request.second_ticket = 0;
+
+ /*
+ * If a list of preauth types are passed in, convert it to a
+ * preauth_to_use list.
+ */
+ if (ptypes) {
+ retval = make_preauth_list(context, ptypes, -1, &preauth_to_use);
+ if (retval)
+ goto cleanup;
+ }
+
+ while (1) {
+ if (loopcount++ > MAX_IN_TKT_LOOPS) {
+ retval = KRB5_GET_IN_TKT_LOOP;
+ goto cleanup;
+ }
+
+ if ((retval = krb5_obtain_padata(context, preauth_to_use, key_proc,
+ keyseed, creds, &request)) != 0)
+ goto cleanup;
+ if (preauth_to_use)
+ krb5_free_pa_data(context, preauth_to_use);
+ preauth_to_use = 0;
+
+ err_reply = 0;
+ as_reply = 0;
+ if ((retval = send_as_request(context, &request, &time_now, &err_reply,
+ &as_reply, NULL)))
+ goto cleanup;
+
+ if (err_reply) {
+ if (err_reply->error == KDC_ERR_PREAUTH_REQUIRED &&
+ err_reply->e_data.length > 0) {
+ retval = decode_krb5_padata_sequence(&err_reply->e_data,
+ &preauth_to_use);
+ krb5_free_error(context, err_reply);
+ if (retval)
+ goto cleanup;
+ continue;
+ } else {
+ retval = err_reply->error + ERROR_TABLE_BASE_krb5;
+ krb5_free_error(context, err_reply);
+ goto cleanup;
+ }
+ } else if (!as_reply) {
+ retval = KRB5KRB_AP_ERR_MSG_TYPE;
+ goto cleanup;
+ }
+ if ((retval = krb5_process_padata(context, &request, as_reply,
+ key_proc, keyseed, decrypt_proc,
+ &decrypt_key, creds,
+ &do_more)) != 0)
+ goto cleanup;
+
+ if (!do_more)
+ break;
+ }
+
+ if ((retval = decrypt_as_reply(context, &request, as_reply, key_proc,
+ keyseed, decrypt_key, decrypt_proc,
+ decryptarg)))
+ goto cleanup;
+
+ if ((retval = verify_as_reply(context, time_now, &request, as_reply)))
+ goto cleanup;
+
+ if ((retval = stash_as_reply(context, time_now, &request, as_reply,
+ creds, ccache)))
+ goto cleanup;
+
+cleanup:
+ if (request.ktype)
+ free(request.ktype);
+ if (!addrs && request.addresses)
+ krb5_free_addresses(context, request.addresses);
+ if (request.padata)
+ krb5_free_pa_data(context, request.padata);
+ if (padata)
+ krb5_free_pa_data(context, padata);
+ if (preauth_to_use)
+ krb5_free_pa_data(context, preauth_to_use);
+ if (decrypt_key)
+ krb5_free_keyblock(context, decrypt_key);
+ if (as_reply) {
+ if (ret_as_reply)
+ *ret_as_reply = as_reply;
+ else
+ krb5_free_kdc_rep(context, as_reply);
+ }
+ return (retval);
+}
+
+/* begin libdefaults parsing code. This should almost certainly move
+ somewhere else, but I don't know where the correct somewhere else
+ is yet. */
+
+/* XXX Duplicating this is annoying; try to work on a better way.*/
+static char *conf_yes[] = {
+ "y", "yes", "true", "t", "1", "on",
+ 0,
+};
+
+static char *conf_no[] = {
+ "n", "no", "false", "nil", "0", "off",
+ 0,
+};
+
+int
+_krb5_conf_boolean(s)
+ char *s;
+{
+ char **p;
+
+ for(p=conf_yes; *p; p++) {
+ if (!strcasecmp(*p,s))
+ return 1;
}
+
+ for(p=conf_no; *p; p++) {
+ if (!strcasecmp(*p,s))
+ return 0;
+ }
+
+ /* Default to "no" */
return 0;
}
+static krb5_error_code
+krb5_libdefault_string(context, realm, option, ret_value)
+ krb5_context context;
+ const krb5_data *realm;
+ const char *option;
+ char **ret_value;
+{
+ profile_t profile;
+ const char *names[5];
+ char **nameval = NULL;
+ krb5_error_code retval;
+ char realmstr[1024];
+ char **cpp;
+
+ if (realm->length > sizeof(realmstr)-1)
+ return(EINVAL);
+
+ strncpy(realmstr, realm->data, realm->length);
+ realmstr[realm->length] = '\0';
+
+ if (!context || (context->magic != KV5M_CONTEXT))
+ return KV5M_CONTEXT;
+
+ profile = context->profile;
+
+ names[0] = "libdefaults";
+
+ /*
+ * Try number one:
+ *
+ * [libdefaults]
+ * REALM = {
+ * option = <boolean>
+ * }
+ */
+
+ names[1] = realmstr;
+ names[2] = option;
+ names[3] = 0;
+ retval = profile_get_values(profile, names, &nameval);
+ if (retval == 0 && nameval && nameval[0])
+ goto goodbye;
+
+ /*
+ * Try number two:
+ *
+ * [libdefaults]
+ * option = <boolean>
+ */
+
+ names[1] = option;
+ names[2] = 0;
+ retval = profile_get_values(profile, names, &nameval);
+ if (retval == 0 && nameval && nameval[0])
+ goto goodbye;
+
+goodbye:
+ if (!nameval)
+ return(ENOENT);
+
+ if (!nameval[0]) {
+ retval = ENOENT;
+ } else {
+ *ret_value = malloc(strlen(nameval[0]) + 1);
+ if (!*ret_value)
+ retval = ENOMEM;
+ else
+ strcpy(*ret_value, nameval[0]);
+ }
+
+ profile_free_list(nameval);
+
+ return retval;
+}
+
+/* not static so verify_init_creds() can call it */
+/* as well as the DNS code */
+
+krb5_error_code
+krb5_libdefault_boolean(context, realm, option, ret_value)
+ krb5_context context;
+ const char *option;
+ const krb5_data *realm;
+ int *ret_value;
+{
+ char *string = NULL;
+ krb5_error_code retval;
+
+ retval = krb5_libdefault_string(context, realm, option, &string);
+
+ if (retval)
+ return(retval);
+
+ *ret_value = _krb5_conf_boolean(string);
+ free(string);
+
+ return(0);
+}
+
+KRB5_DLLIMP krb5_error_code KRB5_CALLCONV
+krb5_get_init_creds(context, creds, client, prompter, prompter_data,
+ start_time, in_tkt_service, options, gak_fct, gak_data,
+ use_master, as_reply)
+ 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_fct;
+ void *gak_data;
+ int use_master;
+ krb5_kdc_rep **as_reply;
+{
+ krb5_error_code ret;
+ krb5_kdc_req request;
+ krb5_pa_data **padata;
+ int tempint;
+ char *tempstr;
+ krb5_deltat renew_life;
+ int loopcount;
+ krb5_data salt;
+ krb5_keyblock as_key;
+ krb5_error *err_reply;
+ krb5_kdc_rep *local_as_reply;
+ krb5_timestamp time_now;
+ krb5_enctype etype = 0;
+
+ /* initialize everything which will be freed at cleanup */
+
+ request.server = NULL;
+ request.ktype = NULL;
+ request.addresses = NULL;
+ request.padata = NULL;
+ padata = NULL;
+ as_key.length = 0;
+ salt.length = 0;
+ salt.data = NULL;
+
+ local_as_reply = 0;
+
+ /*
+ * Set up the basic request structure
+ */
+ request.magic = KV5M_KDC_REQ;
+ request.msg_type = KRB5_AS_REQ;
+
+ /* request.padata is filled in later */
+
+ request.kdc_options = 0;
+
+ /* forwardable */
+
+ if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE))
+ tempint = options->forwardable;
+ else if ((ret = krb5_libdefault_boolean(context, &client->realm,
+ "forwardable", &tempint)) == 0)
+ ;
+ else
+ tempint = 0;
+ if (tempint)
+ request.kdc_options |= KDC_OPT_FORWARDABLE;
+
+ /* proxiable */
+
+ if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE))
+ tempint = options->proxiable;
+ else if ((ret = krb5_libdefault_boolean(context, &client->realm,
+ "proxiable", &tempint)) == 0)
+ ;
+ else
+ tempint = 0;
+ if (tempint)
+ request.kdc_options |= KDC_OPT_PROXIABLE;
+
+ /* renewable */
+
+ if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE)) {
+ renew_life = options->renew_life;
+ } else if ((ret = krb5_libdefault_string(context, &client->realm,
+ "renew_lifetime", &tempstr))
+ == 0) {
+ if (ret = krb5_string_to_deltat(tempstr, &renew_life)) {
+ free(tempstr);
+ goto cleanup;
+ }
+ } else {
+ renew_life = 0;
+ }
+ if (renew_life > 0)
+ request.kdc_options |= KDC_OPT_RENEWABLE;
+
+ /* allow_postdate */
+
+ if (start_time > 0)
+ request.kdc_options |= (KDC_OPT_ALLOW_POSTDATE|KDC_OPT_POSTDATED);
+
+ /* client */
+
+ request.client = client;
+
+ if (in_tkt_service) {
+ /* this is ugly, because so are the data structures involved. I'm
+ in the library, so I'm going to manipulate the data structures
+ directly, otherwise, it will be worse. */
+
+ if (ret = krb5_parse_name(context, in_tkt_service, &request.server))
+ goto cleanup;
+
+ /* stuff the client realm into the server principal.
+ realloc if necessary */
+ if (request.server->realm.length < request.client->realm.length)
+ if ((request.server->realm.data =
+ (char *) realloc(request.server->realm.data,
+ request.client->realm.length)) == NULL) {
+ ret = ENOMEM;
+ goto cleanup;
+ }
+
+ request.server->realm.length = request.client->realm.length;
+ memcpy(request.server->realm.data, request.client->realm.data,
+ request.client->realm.length);
+ } else {
+ if (ret = krb5_build_principal_ext(context, &request.server,
+ request.client->realm.length,
+ request.client->realm.data,
+ KRB5_TGS_NAME_SIZE,
+ KRB5_TGS_NAME,
+ request.client->realm.length,
+ request.client->realm.data,
+ 0))
+ goto cleanup;
+ }
+
+ if (ret = krb5_timeofday(context, &request.from))
+ goto cleanup;
+ request.from += start_time;
+
+ request.till = request.from;
+ if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_TKT_LIFE))
+ request.till += options->tkt_life;
+ else
+ request.till += 10*60*60; /* this used to be hardcoded in kinit.c */
+
+ if (renew_life > 0) {
+ request.rtime = request.from;
+ request.rtime += renew_life;
+ } else {
+ request.rtime = 0;
+ }
+
+ /* nonce is filled in by send_as_request */
+
+ if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST)) {
+ request.ktype = options->etype_list;
+ request.nktypes = options->etype_list_length;
+ } else if ((ret = krb5_get_default_in_tkt_ktypes(context,
+ &request.ktype)) == 0) {
+ for (request.nktypes = 0;
+ request.ktype[request.nktypes];
+ request.nktypes++)
+ ;
+ } else {
+ /* there isn't any useful default here. ret is set from above */
+ goto cleanup;
+ }
+
+ if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST)) {
+ request.addresses = options->address_list;
+ }
+ /* it would be nice if this parsed out an address list, but
+ that would be work. */
+ else if (((ret = krb5_libdefault_boolean(context, &client->realm,
+ "noaddresses", &tempint)) == 0)
+ && tempint) {
+ ;
+ } else {
+ if ((ret = krb5_os_localaddr(context, &request.addresses)))
+ goto cleanup;
+ }
+
+ request.authorization_data.ciphertext.length = 0;
+ request.authorization_data.ciphertext.data = 0;
+ request.unenc_authdata = 0;
+ request.second_ticket = 0;
+
+ /* set up the other state. */
+
+ if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST)) {
+ if (ret = make_preauth_list(context, options->preauth_list,
+ options->preauth_list_length,
+ &padata))
+ goto cleanup;
+ }
+
+ /* the salt is allocated from somewhere, unless it is from the caller,
+ then it is a reference */
+
+ if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_SALT)) {
+ salt = *options->salt;
+ } else {
+ salt.length = -1;
+ salt.data = NULL;
+ }
+
+ /* now, loop processing preauth data and talking to the kdc */
+
+ for (loopcount = 0; loopcount < MAX_IN_TKT_LOOPS; loopcount++) {
+ if (request.padata) {
+ krb5_free_pa_data(context, request.padata);
+ request.padata = NULL;
+ }
+
+ if (ret = krb5_do_preauth(context, &request,
+ padata, &request.padata,
+ &salt, &etype, &as_key, prompter,
+ prompter_data, gak_fct, gak_data))
+ goto cleanup;
+
+ if (padata) {
+ krb5_free_pa_data(context, padata);
+ padata = 0;
+ }
+
+ err_reply = 0;
+ local_as_reply = 0;
+ if ((ret = send_as_request(context, &request, &time_now, &err_reply,
+ &local_as_reply, use_master)))
+ goto cleanup;
+
+ if (err_reply) {
+ if (err_reply->error == KDC_ERR_PREAUTH_REQUIRED &&
+ err_reply->e_data.length > 0) {
+ ret = decode_krb5_padata_sequence(&err_reply->e_data,
+ &padata);
+ krb5_free_error(context, err_reply);
+ if (ret)
+ goto cleanup;
+ } else {
+ ret = err_reply->error + ERROR_TABLE_BASE_krb5;
+ krb5_free_error(context, err_reply);
+ goto cleanup;
+ }
+ } else if (local_as_reply) {
+ break;
+ } else {
+ ret = KRB5KRB_AP_ERR_MSG_TYPE;
+ goto cleanup;
+ }
+ }
+
+ if (loopcount == MAX_IN_TKT_LOOPS) {
+ ret = KRB5_GET_IN_TKT_LOOP;
+ goto cleanup;
+ }
+
+ /* process any preauth data in the as_reply */
+
+ if (ret = krb5_do_preauth(context, &request,
+ local_as_reply->padata, &padata,
+ &salt, &etype, &as_key, prompter,
+ prompter_data, gak_fct, gak_data))
+ goto cleanup;
+
+ /* XXX if there's padata on output, something is wrong, but it's
+ not obviously an error */
+
+ /* XXX For 1.1.1 and prior KDC's, when SAM is used w/ USE_SAD_AS_KEY,
+ the AS_REP comes back encrypted in the user's longterm key
+ instead of in the SAD. If there was a SAM preauth, there
+ will be an as_key here which will be the SAD. If that fails,
+ use the gak_fct to get the password, and try again. */
+
+ /* XXX because etypes are handled poorly (particularly wrt SAM,
+ where the etype is fixed by the kdc), we may want to try
+ decrypt_as_reply twice. If there's an as_key available, try
+ it. If decrypting the as_rep fails, or if there isn't an
+ as_key at all yet, then use the gak_fct to get one, and try
+ again. */
+
+ if (as_key.length)
+ ret = decrypt_as_reply(context, NULL, local_as_reply, NULL,
+ NULL, &as_key, krb5_kdc_rep_decrypt_proc,
+ NULL);
+ else
+ ret = -1;
+
+ if (ret) {
+ /* if we haven't get gotten a key, get it now */
+
+ if (ret = ((*gak_fct)(context, request.client,
+ local_as_reply->enc_part.enctype,
+ prompter, prompter_data, &salt,
+ &as_key, gak_data)))
+ goto cleanup;
+
+ if (ret = decrypt_as_reply(context, NULL, local_as_reply, NULL,
+ NULL, &as_key, krb5_kdc_rep_decrypt_proc,
+ NULL))
+ goto cleanup;
+ }
+
+ if (ret = verify_as_reply(context, time_now, &request, local_as_reply))
+ goto cleanup;
+
+ /* XXX this should be inside stash_as_reply, but as long as
+ get_in_tkt is still around using that arg as an in/out, I can't
+ do that */
+ memset(creds, 0, sizeof(*creds));
+
+ if (ret = stash_as_reply(context, time_now, &request, local_as_reply,
+ creds, NULL))
+ goto cleanup;
+
+ /* success */
+
+ ret = 0;
+
+cleanup:
+ if (request.server)
+ krb5_free_principal(context, request.server);
+ if (request.ktype &&
+ (!(options && (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST))))
+ free(request.ktype);
+ if (request.addresses &&
+ (!(options &&
+ (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST))))
+ krb5_free_addresses(context, request.addresses);
+ if (padata)
+ krb5_free_pa_data(context, padata);
+ if (request.padata)
+ krb5_free_pa_data(context, request.padata);
+ if (as_key.length)
+ krb5_free_keyblock_contents(context, &as_key);
+ if (salt.data &&
+ (!(options && (options->flags & KRB5_GET_INIT_CREDS_OPT_SALT))))
+ krb5_xfree(salt.data);
+ if (as_reply)
+ *as_reply = local_as_reply;
+ else if (local_as_reply)
+ krb5_free_kdc_rep(context, local_as_reply);
+
+ return(ret);
+}
projects / krb5.git / blobdiff