26457b7135
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13790 ec53bebd-3082-4978-b11e-865c3cabbd6b
455 lines
11 KiB
C
455 lines
11 KiB
C
/*
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* Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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RCSID("$Id$");
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#include "krb5-v4compat.h"
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static krb5_error_code
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check_ticket_flags(TicketFlags f)
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{
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return 0; /* maybe add some more tests here? */
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}
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/* include this here, to avoid dependencies on libkrb */
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static const int _tkt_lifetimes[TKTLIFENUMFIXED] = {
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38400, 41055, 43894, 46929, 50174, 53643, 57352, 61318,
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65558, 70091, 74937, 80119, 85658, 91581, 97914, 104684,
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111922, 119661, 127935, 136781, 146239, 156350, 167161, 178720,
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191077, 204289, 218415, 233517, 249664, 266926, 285383, 305116,
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326213, 348769, 372885, 398668, 426234, 455705, 487215, 520904,
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556921, 595430, 636601, 680618, 727680, 777995, 831789, 889303,
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950794, 1016537, 1086825, 1161973, 1242318, 1328218, 1420057, 1518247,
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1623226, 1735464, 1855462, 1983758, 2120925, 2267576, 2424367, 2592000
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};
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int
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_krb5_krb_time_to_life(time_t start, time_t end)
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{
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int i;
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time_t life = end - start;
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if (life > MAXTKTLIFETIME || life <= 0)
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return 0;
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#if 0
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if (krb_no_long_lifetimes)
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return (life + 5*60 - 1)/(5*60);
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#endif
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if (end >= NEVERDATE)
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return TKTLIFENOEXPIRE;
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if (life < _tkt_lifetimes[0])
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return (life + 5*60 - 1)/(5*60);
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for (i=0; i<TKTLIFENUMFIXED; i++)
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if (life <= _tkt_lifetimes[i])
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return i + TKTLIFEMINFIXED;
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return 0;
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}
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time_t
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_krb5_krb_life_to_time(int start, int life_)
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{
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unsigned char life = (unsigned char) life_;
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#if 0
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if (krb_no_long_lifetimes)
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return start + life*5*60;
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#endif
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if (life == TKTLIFENOEXPIRE)
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return NEVERDATE;
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if (life < TKTLIFEMINFIXED)
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return start + life*5*60;
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if (life > TKTLIFEMAXFIXED)
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return start + MAXTKTLIFETIME;
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return start + _tkt_lifetimes[life - TKTLIFEMINFIXED];
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}
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/*
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* Get the name of the krb4 credentials cache, will use `tkfile' as
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* the name if that is passed in. `cc' must be free()ed by caller,
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*/
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static krb5_error_code
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get_krb4_cc_name(const char *tkfile, char **cc)
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{
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*cc = NULL;
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if(tkfile == NULL) {
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char *path;
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if(!issuid()) {
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path = getenv("KRBTKFILE");
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if (path)
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*cc = strdup(path);
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}
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if(*cc == NULL)
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if (asprintf(cc, "%s%u", TKT_ROOT, (unsigned)getuid()) < 0)
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return errno;
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} else {
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*cc = strdup(tkfile);
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if (*cc == NULL)
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return ENOMEM;
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}
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return 0;
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}
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/*
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* Write a Kerberos 4 ticket file
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*/
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#define KRB5_TF_LCK_RETRY_COUNT 50
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#define KRB5_TF_LCK_RETRY 1
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static krb5_error_code
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write_v4_cc(krb5_context context, const char *tkfile,
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krb5_storage *sp, int append)
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{
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krb5_error_code ret;
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struct stat sb;
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krb5_data data;
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char *path;
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int fd, i;
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ret = get_krb4_cc_name(tkfile, &path);
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if (ret) {
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krb5_set_error_string(context,
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"krb5_krb_tf_setup: failed getting "
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"the krb4 credentials cache name");
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return ret;
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}
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fd = open(path, O_WRONLY|O_CREAT, 0600);
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if (fd < 0) {
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free(path);
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krb5_set_error_string(context,
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"krb5_krb_tf_setup: error opening file %s",
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path);
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return errno;
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}
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if (fstat(fd, &sb) != 0 || !S_ISREG(sb.st_mode)) {
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free(path);
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close(fd);
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krb5_set_error_string(context,
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"krb5_krb_tf_setup: tktfile %s is not a file",
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path);
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return KRB5_FCC_PERM;
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}
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for (i = 0; i < KRB5_TF_LCK_RETRY_COUNT; i++) {
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if (flock(fd, LOCK_EX | LOCK_NB) < 0) {
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sleep(KRB5_TF_LCK_RETRY);
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} else
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break;
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}
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if (i == KRB5_TF_LCK_RETRY_COUNT) {
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free(path);
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close(fd);
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krb5_set_error_string(context,
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"krb5_krb_tf_setup: failed to lock %s",
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path);
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return KRB5_FCC_PERM;
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}
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if (!append) {
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ret = ftruncate(fd, 0);
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if (ret < 0) {
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flock(fd, LOCK_UN);
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free(path);
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close(fd);
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krb5_set_error_string(context,
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"krb5_krb_tf_setup: failed to truncate %s",
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path);
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return KRB5_FCC_PERM;
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}
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}
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ret = lseek(fd, 0L, SEEK_END);
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if (ret < 0) {
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ret = errno;
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flock(fd, LOCK_UN);
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free(path);
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close(fd);
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return ret;
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}
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krb5_storage_to_data(sp, &data);
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ret = write(fd, data.data, data.length);
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if (ret != data.length)
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ret = KRB5_CC_IO;
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krb5_free_data_contents(context, &data);
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flock(fd, LOCK_UN);
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free(path);
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close(fd);
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return 0;
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}
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krb5_error_code
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_krb5_krb_tf_setup(krb5_context context,
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struct credentials *v4creds,
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const char *tkfile,
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int append)
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{
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krb5_error_code ret;
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krb5_storage *sp;
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sp = krb5_storage_emem();
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if (sp == NULL)
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return ENOMEM;
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krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_HOST);
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krb5_storage_set_eof_code(sp, KRB5_CC_IO);
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krb5_clear_error_string(context);
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if (!append) {
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ret = krb5_store_stringz(sp, v4creds->pname);
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if (ret < 0)
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goto error;
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ret = krb5_store_stringz(sp, v4creds->pinst);
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if (ret < 0)
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goto error;
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}
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/* cred */
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ret = krb5_store_stringz(sp, v4creds->service);
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if (ret < 0)
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goto error;
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ret = krb5_store_stringz(sp, v4creds->instance);
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if (ret < 0)
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goto error;
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ret = krb5_store_stringz(sp, v4creds->realm);
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if (ret < 0)
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goto error;
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ret = krb5_storage_write(sp, v4creds->session, 8);
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if (ret != 8) {
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ret = KRB5_CC_IO;
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goto error;
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}
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ret = krb5_store_int32(sp, v4creds->lifetime);
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if (ret)
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goto error;
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ret = krb5_store_int32(sp, v4creds->kvno);
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if (ret)
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goto error;
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ret = krb5_store_int32(sp, v4creds->ticket_st.length);
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if (ret)
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goto error;
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ret = krb5_storage_write(sp, v4creds->ticket_st.dat,
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v4creds->ticket_st.length);
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if (ret != v4creds->ticket_st.length) {
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ret = KRB5_CC_IO;
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goto error;
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}
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ret = krb5_store_int32(sp, v4creds->issue_date);
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if (ret)
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goto error;
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ret = write_v4_cc(context, tkfile, sp, append);
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error:
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krb5_storage_free(sp);
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return ret;
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}
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krb5_error_code
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_krb5_krb_dest_tkt(krb5_context context, const char *tkfile)
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{
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krb5_error_code ret;
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char *path;
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ret = get_krb4_cc_name(tkfile, &path);
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if (ret) {
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krb5_set_error_string(context,
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"krb5_krb_tf_setup: failed getting "
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"the krb4 credentials cache name");
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return ret;
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}
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if (unlink(path) < 0) {
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ret = errno;
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krb5_set_error_string(context,
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"krb5_krb_dest_tkt failed removing the cache "
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"with error %s", strerror(ret));
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}
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free(path);
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return ret;
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}
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/* Convert the v5 credentials in `in_cred' to v4-dito in `v4creds'.
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* This is done by sending them to the 524 function in the KDC. If
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* `in_cred' doesn't contain a DES session key, then a new one is
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* gotten from the KDC and stored in the cred cache `ccache'.
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*/
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krb5_error_code
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krb524_convert_creds_kdc(krb5_context context,
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krb5_creds *in_cred,
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struct credentials *v4creds)
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{
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krb5_error_code ret;
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krb5_data reply;
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krb5_storage *sp;
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int32_t tmp;
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krb5_data ticket;
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char realm[REALM_SZ];
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krb5_creds *v5_creds = in_cred;
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ret = check_ticket_flags(v5_creds->flags.b);
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if(ret)
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goto out2;
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{
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krb5_krbhst_handle handle;
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ret = krb5_krbhst_init(context,
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krb5_principal_get_realm(context,
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v5_creds->server),
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KRB5_KRBHST_KRB524,
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&handle);
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if (ret)
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goto out2;
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ret = krb5_sendto (context,
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&v5_creds->ticket,
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handle,
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&reply);
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krb5_krbhst_free(context, handle);
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if (ret)
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goto out2;
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}
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sp = krb5_storage_from_mem(reply.data, reply.length);
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if(sp == NULL) {
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ret = ENOMEM;
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krb5_set_error_string (context, "malloc: out of memory");
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goto out2;
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}
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krb5_ret_int32(sp, &tmp);
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ret = tmp;
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if(ret == 0) {
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memset(v4creds, 0, sizeof(*v4creds));
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ret = krb5_ret_int32(sp, &tmp);
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if(ret)
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goto out;
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v4creds->kvno = tmp;
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ret = krb5_ret_data(sp, &ticket);
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if(ret)
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goto out;
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v4creds->ticket_st.length = ticket.length;
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memcpy(v4creds->ticket_st.dat, ticket.data, ticket.length);
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krb5_data_free(&ticket);
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ret = krb5_524_conv_principal(context,
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v5_creds->server,
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v4creds->service,
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v4creds->instance,
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v4creds->realm);
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if(ret)
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goto out;
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v4creds->issue_date = v5_creds->times.starttime;
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v4creds->lifetime = _krb5_krb_time_to_life(v4creds->issue_date,
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v5_creds->times.endtime);
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ret = krb5_524_conv_principal(context, v5_creds->client,
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v4creds->pname,
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v4creds->pinst,
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realm);
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if(ret)
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goto out;
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memcpy(v4creds->session, v5_creds->session.keyvalue.data, 8);
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} else {
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krb5_set_error_string(context, "converting credentials: %s",
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krb5_get_err_text(context, ret));
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}
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out:
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krb5_storage_free(sp);
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krb5_data_free(&reply);
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out2:
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if (v5_creds != in_cred)
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krb5_free_creds (context, v5_creds);
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return ret;
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}
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krb5_error_code
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krb524_convert_creds_kdc_ccache(krb5_context context,
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krb5_ccache ccache,
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krb5_creds *in_cred,
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struct credentials *v4creds)
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{
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krb5_error_code ret;
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krb5_creds *v5_creds = in_cred;
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krb5_keytype keytype;
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keytype = v5_creds->session.keytype;
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if (keytype != ENCTYPE_DES_CBC_CRC) {
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/* MIT krb524d doesn't like nothing but des-cbc-crc tickets,
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so go get one */
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krb5_creds template;
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memset (&template, 0, sizeof(template));
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template.session.keytype = ENCTYPE_DES_CBC_CRC;
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ret = krb5_copy_principal (context, in_cred->client, &template.client);
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if (ret) {
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krb5_free_cred_contents (context, &template);
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return ret;
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}
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ret = krb5_copy_principal (context, in_cred->server, &template.server);
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if (ret) {
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krb5_free_cred_contents (context, &template);
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return ret;
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}
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ret = krb5_get_credentials (context, 0, ccache,
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&template, &v5_creds);
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krb5_free_cred_contents (context, &template);
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if (ret)
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return ret;
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}
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ret = krb524_convert_creds_kdc(context, v5_creds, v4creds);
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if (v5_creds != in_cred)
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krb5_free_creds (context, v5_creds);
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return ret;
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}
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