/*
* lib/krb5/krb/get_in_tkt.c
*
- * Copyright 1990,1991 by the Massachusetts Institute of Technology.
+ * Copyright 1990,1991, 2003 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* 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. M.I.T. makes no representations about the suitability of
+ * 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()
*/
+#include <string.h>
+
#include "k5-int.h"
+#include "int-proto.h"
+#include "os-proto.h"
/*
All-purpose initial ticket routine, usually called via
*/
-extern krb5_deltat krb5_clockskew;
-#define in_clock_skew(date) (labs((date)-request.nonce) < krb5_clockskew)
-
/* some typedef's for the function args to make things look a bit cleaner */
-typedef krb5_error_code (*git_key_proc) PROTOTYPE((krb5_context,
+typedef krb5_error_code (*git_key_proc) (krb5_context,
const krb5_enctype,
krb5_data *,
krb5_const_pointer,
- krb5_keyblock **));
+ krb5_keyblock **);
-typedef krb5_error_code (*git_decrypt_proc) PROTOTYPE((krb5_context,
+typedef krb5_error_code (*git_decrypt_proc) (krb5_context,
const krb5_keyblock *,
krb5_const_pointer,
- krb5_kdc_rep * ));
-krb5_error_code
-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 * const * addrs;
- krb5_enctype * ktypes;
- krb5_preauthtype * ptypes;
- git_key_proc key_proc;
- krb5_const_pointer keyseed;
- git_decrypt_proc decrypt_proc;
- krb5_const_pointer decryptarg;
- krb5_creds * creds;
- krb5_ccache ccache;
- krb5_kdc_rep ** ret_as_reply;
+ krb5_kdc_rep * );
+
+static krb5_error_code make_preauth_list (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(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_enctype enctype, ktype;
- krb5_kdc_req request;
krb5_kdc_rep *as_reply = 0;
- krb5_error *err_reply;
krb5_error_code retval;
- krb5_data *packet;
+ krb5_data *packet = 0;
krb5_data reply;
- krb5_keyblock *decrypt_key = 0;
- krb5_timestamp time_now;
-/* krb5_pa_data *padata; */
- krb5_pa_data **preauth_to_use = 0;
- int f_salt = 0, use_salt = 0;
- krb5_data salt;
char k4_version; /* same type as *(krb5_data::data) */
-
- if (! krb5_realm_compare(context, creds->client, creds->server))
- return KRB5_IN_TKT_REALM_MISMATCH;
-
- if (ret_as_reply)
- *ret_as_reply = 0;
-
- request.msg_type = KRB5_AS_REQ;
- if (!addrs)
- krb5_os_localaddr(context, &request.addresses);
- else
- request.addresses = (krb5_address **) addrs;
+ int tcp_only = 0;
reply.data = 0;
-
- if (1) {
- decrypt_key = 0;
- request.padata = 0;
- } else {
- /* Pre authentication is not yet supported */
-
- /*
- * First, we get the user's key. We assume we will need
- * it for the pre-authentication. Actually, this could
- * possibly not be the case, but it's usually true.
- *
- * XXX Problem here: if we're doing preauthentication,
- * we're getting the key before we get the KDC hit as to
- * which salting algorithm to use; hence, we're using the
- * default. But if we're changing salts, because of a
- * realm renaming, or some such, this won't work.
- */
-/* retval = (*key_proc)(context, enctype, &decrypt_key, keyseed, 0); */
- if (retval)
- return retval;
- request.padata = (krb5_pa_data **) malloc(sizeof(krb5_pa_data *)
- * 2);
- if (!request.padata) {
- retval = ENOMEM;
- goto cleanup;
- }
-
- /* retval = krb5_obtain_padata(context, ptypes[0], creds->client,
- request.addresses, decrypt_key,
- &padata); */
- if (retval)
- goto cleanup;
-/* request.padata[0] = padata; */
- request.padata[1] = 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(context, &time_now)))
- goto cleanup;
-
- /* XXX we know they are the same size... */
- request.nonce = (krb5_int32) time_now;
-
- if (ktypes)
- request.ktype = ktypes;
- else
- krb5_get_default_in_tkt_ktypes(context, &request.ktype);
- for (request.nktypes = 0;request.ktype[request.nktypes];request.nktypes++);
- request.authorization_data.ciphertext.length = 0;
- request.authorization_data.ciphertext.data = 0;
- request.unenc_authdata = 0;
- request.second_ticket = 0;
-
- if ((retval = krb5_timeofday(context, &time_now)))
+ if ((retval = krb5_timeofday(context, time_now)))
goto cleanup;
- /* XXX we know they are the same size... */
- request.nonce = (krb5_int32) time_now;
+ /*
+ * 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 */
- retval = encode_krb5_as_req(&request, &packet);
- if (!ktypes)
- free(request.ktype);
- if (retval)
- goto cleanup;
+ if ((retval = encode_krb5_as_req(request, &packet)) != 0)
+ goto cleanup;
k4_version = packet->data[0];
+send_again:
retval = krb5_sendto_kdc(context, packet,
- krb5_princ_realm(context, creds->client), &reply);
- krb5_free_data(context, packet);
+ krb5_princ_realm(context, request->client),
+ &reply, use_master, tcp_only);
if (retval)
goto cleanup;
/* now decode the reply...could be error or as_rep */
-
if (krb5_is_krb_error(&reply)) {
+ krb5_error *err_reply;
+
if ((retval = decode_krb5_error(&reply, &err_reply)))
/* some other error code--??? */
goto cleanup;
- 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);
- /* XXX we need to actually do something with the info */
- krb5_free_pa_data(context, preauth_to_use);
- }
-
- retval = err_reply->error + ERROR_TABLE_BASE_krb5;
-
- /* XXX somehow make error msg text available to application? */
-
- krb5_free_error(context, err_reply);
+ if (ret_err_reply) {
+ if (err_reply->error == KRB_ERR_RESPONSE_TOO_BIG
+ && tcp_only == 0) {
+ tcp_only = 1;
+ krb5_free_error(context, err_reply);
+ free(reply.data);
+ reply.data = 0;
+ goto send_again;
+ }
+ *ret_err_reply = err_reply;
+ } else
+ 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
}
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;
if (as_reply->msg_type != KRB5_AS_REP) {
retval = KRB5KRB_AP_ERR_MSG_TYPE;
+ krb5_free_kdc_rep(context, as_reply);
goto cleanup;
}
- /* Encryption type, enctype, */
- enctype = as_reply->ticket->enc_part.enctype;
-
- /* and salt */
- if (as_reply->padata) {
- krb5_pa_data **ptr;
-
- for (ptr = as_reply->padata; *ptr; ptr++) {
- if ((*ptr)->pa_type == KRB5_PADATA_PW_SALT) {
- /* use KDC-supplied salt, instead of default */
- salt.data = (char *)(*ptr)->contents;
- salt.length = (*ptr)->length;
- use_salt = 1;
- break;
- }
- }
- }
- if (!use_salt) {
- /* need to use flattened principal */
- if ((retval = krb5_principal2salt(context, creds->client, &salt)))
- return(retval);
- f_salt = 1;
- }
+ if (ret_as_reply)
+ *ret_as_reply = as_reply;
+ else
+ krb5_free_kdc_rep(context, as_reply);
- /* it was a kdc_rep--decrypt & check */
- /* Generate the key, if we haven't done so already. */
- if (!decrypt_key) {
- if ((retval = (*key_proc)(context, enctype, & salt, keyseed,
- &decrypt_key)))
- goto cleanup;
+cleanup:
+ if (packet)
+ krb5_free_data(context, packet);
+ if (reply.data)
+ free(reply.data);
+ return retval;
+}
+
+static krb5_error_code
+decrypt_as_reply(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;
+
+ if (key)
+ decrypt_key = key;
+ else {
+ if ((retval = krb5_principal2salt(context, request->client, &salt)))
+ 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;
- krb5_free_keyblock(context, decrypt_key);
- decrypt_key = 0;
+cleanup:
+ if (!key && decrypt_key)
+ krb5_free_keyblock(context, decrypt_key);
+ return (retval);
+}
+
+static krb5_error_code
+verify_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(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)
+
+ 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(context, addrs, as_reply->enc_part2->caddrs)) */
- || ((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) &&
+ || ((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))
- ) {
- retval = KRB5_KDCREP_MODIFIED;
- goto cleanup;
- }
- if ((request.from == 0) &&
- !in_clock_skew(as_reply->enc_part2->times.starttime)) {
- retval = KRB5_KDCREP_SKEW;
- goto cleanup;
+ (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);
}
-
- if (context->library_options & KRB5_LIBOPT_SYNC_KDCTIME)
- krb5_set_time_offsets(context,
- as_reply->enc_part2->times.authtime - time_now,
- 0);
+ return 0;
+}
+
+static krb5_error_code
+stash_as_reply(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_contents(context,
as_reply->enc_part2->session,
creds->ticket_flags = as_reply->enc_part2->flags;
if ((retval = krb5_copy_addresses(context, as_reply->enc_part2->caddrs,
&creds->addresses)))
- goto cred_cleanup;
+ goto cleanup;
creds->second_ticket.length = 0;
creds->second_ticket.data = 0;
if ((retval = encode_krb5_ticket(as_reply->ticket, &packet)))
- goto cred_cleanup;
+ goto cleanup;
creds->ticket = *packet;
krb5_xfree(packet);
/* store it in the ccache! */
- if (ccache) {
- if ((retval = krb5_cc_store_cred(context, ccache, creds)))
- goto cred_cleanup;
+ 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);
+}
- if (ret_as_reply) {
- *ret_as_reply = as_reply;
- as_reply = 0;
+static krb5_error_code
+make_preauth_list(krb5_context context,
+ krb5_preauthtype * ptypes,
+ int nptypes,
+ krb5_pa_data *** ret_list)
+{
+ krb5_preauthtype * ptypep;
+ krb5_pa_data ** preauthp;
+ 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;
+}
- retval = 0;
+#define MAX_IN_TKT_LOOPS 16
+
+krb5_error_code KRB5_CALLCONV
+krb5_get_in_tkt(krb5_context context,
+ const krb5_flags options,
+ krb5_address * const * addrs,
+ krb5_enctype * ktypes,
+ krb5_preauthtype * ptypes,
+ git_key_proc key_proc,
+ krb5_const_pointer keyseed,
+ git_decrypt_proc decrypt_proc,
+ krb5_const_pointer decryptarg,
+ krb5_creds * creds,
+ krb5_ccache ccache,
+ krb5_kdc_rep ** 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, 0)))
+ 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 = (krb5_error_code) 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 (f_salt)
- krb5_xfree(salt.data);
- if (as_reply)
- krb5_free_kdc_rep(context, as_reply);
- if (reply.data)
- free(reply.data);
- if (decrypt_key)
- krb5_free_keyblock(context, decrypt_key);
- if (request.padata)
- free(request.padata);
- if (!addrs)
+ if (request.ktype)
+ free(request.ktype);
+ if (!addrs && request.addresses)
krb5_free_addresses(context, request.addresses);
- return retval;
+ 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 const char *const conf_yes[] = {
+ "y", "yes", "true", "t", "1", "on",
+ 0,
+};
+
+static const char *const conf_no[] = {
+ "n", "no", "false", "nil", "0", "off",
+ 0,
+};
+
+int
+_krb5_conf_boolean(const char *s)
+{
+ const char *const *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(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];
+
+ 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(krb5_context context, const krb5_data *realm,
+ const char *option, 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_error_code KRB5_CALLCONV
+krb5_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_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_data s2kparams;
+ 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 */
+
+ s2kparams.data = NULL;
+ s2kparams.length = 0;
+ 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;
+
/*
- * Clean up left over mess in credentials structure, in case of
- * error
+ * Set up the basic request structure
*/
-cred_cleanup:
- 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;
+ 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 (creds->ticket.data) {
- krb5_xfree(creds->ticket.data);
- creds->ticket.data = 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 (creds->addresses) {
- krb5_free_addresses(context, creds->addresses);
- creds->addresses = 0;
+
+ 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;
}
- goto cleanup;
-}
+ /* 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 == 1)) {
+ ;
+ } 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 = SALT_TYPE_AFS_LENGTH;
+ 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, &s2kparams, &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 = (krb5_error_code) 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, &s2kparams, &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, &s2kparams,
+ &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