several new kerberos related libraries and applications to FreeBSD: o kgetcred(1) allows one to manually get a ticket for a particular service. o kf(1) securily forwards ticket to another host through an authenticated and encrypted stream. o kcc(1) is an umbrella program around klist(1), kswitch(1), kgetcred(1) and other user kerberos operations. klist and kswitch are just symlinks to kcc(1) now. o kswitch(1) allows you to easily switch between kerberos credentials if you're running KCM. o hxtool(1) is a certificate management tool to use with PKINIT. o string2key(1) maps a password into key. o kdigest(8) is a userland tool to access the KDC's digest interface. o kimpersonate(8) creates a "fake" ticket for a service. We also now install manpages for some lirbaries that were not installed before, libheimntlm and libhx509. - The new HEIMDAL version no longer supports Kerberos 4. All users are recommended to switch to Kerberos 5. - Weak ciphers are now disabled by default. To enable DES support (used by telnet(8)), use "allow_weak_crypto" option in krb5.conf. - libtelnet, pam_ksu and pam_krb5 are now compiled with error on warnings disabled due to the function they use (krb5_get_err_text(3)) being deprecated. I plan to work on this next. - Heimdal's KDC now require sqlite to operate. We use the bundled version and install it as libheimsqlite. If some other FreeBSD components will require it in the future we can rename it to libbsdsqlite and use for these components as well. - This is not a latest Heimdal version, the new one was released while I was working on the update. I will update it to 1.5.2 soon, as it fixes some important bugs and security issues.
397 lines
10 KiB
C
397 lines
10 KiB
C
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/*
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* Copyright (c) 1997 - 2001, 2003 - 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 "hdb_locl.h"
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/*
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* free all the memory used by (len, keys)
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*/
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void
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hdb_free_keys (krb5_context context, int len, Key *keys)
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{
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int i;
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for (i = 0; i < len; i++) {
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free(keys[i].mkvno);
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keys[i].mkvno = NULL;
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if (keys[i].salt != NULL) {
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free_Salt(keys[i].salt);
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free(keys[i].salt);
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keys[i].salt = NULL;
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}
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krb5_free_keyblock_contents(context, &keys[i].key);
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}
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free (keys);
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}
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/*
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* for each entry in `default_keys' try to parse it as a sequence
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* of etype:salttype:salt, syntax of this if something like:
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* [(des|des3|etype):](pw-salt|afs3)[:string], if etype is omitted it
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* means all etypes, and if string is omitted is means the default
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* string (for that principal). Additional special values:
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* v5 == pw-salt, and
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* v4 == des:pw-salt:
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* afs or afs3 == des:afs3-salt
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*/
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static const krb5_enctype des_etypes[] = {
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ETYPE_DES_CBC_MD5,
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ETYPE_DES_CBC_MD4,
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ETYPE_DES_CBC_CRC
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};
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static const krb5_enctype all_etypes[] = {
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ETYPE_AES256_CTS_HMAC_SHA1_96,
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ETYPE_ARCFOUR_HMAC_MD5,
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ETYPE_DES3_CBC_SHA1
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};
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static krb5_error_code
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parse_key_set(krb5_context context, const char *key,
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krb5_enctype **ret_enctypes, size_t *ret_num_enctypes,
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krb5_salt *salt, krb5_principal principal)
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{
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const char *p;
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char buf[3][256];
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int num_buf = 0;
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int i, num_enctypes = 0;
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krb5_enctype e;
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const krb5_enctype *enctypes = NULL;
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krb5_error_code ret;
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p = key;
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*ret_enctypes = NULL;
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*ret_num_enctypes = 0;
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/* split p in a list of :-separated strings */
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for(num_buf = 0; num_buf < 3; num_buf++)
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if(strsep_copy(&p, ":", buf[num_buf], sizeof(buf[num_buf])) == -1)
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break;
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salt->saltvalue.data = NULL;
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salt->saltvalue.length = 0;
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for(i = 0; i < num_buf; i++) {
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if(enctypes == NULL && num_buf > 1) {
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/* this might be a etype specifier */
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/* XXX there should be a string_to_etypes handling
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special cases like `des' and `all' */
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if(strcmp(buf[i], "des") == 0) {
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enctypes = des_etypes;
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num_enctypes = sizeof(des_etypes)/sizeof(des_etypes[0]);
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} else if(strcmp(buf[i], "des3") == 0) {
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e = ETYPE_DES3_CBC_SHA1;
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enctypes = &e;
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num_enctypes = 1;
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} else {
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ret = krb5_string_to_enctype(context, buf[i], &e);
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if (ret == 0) {
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enctypes = &e;
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num_enctypes = 1;
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} else
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return ret;
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}
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continue;
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}
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if(salt->salttype == 0) {
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/* interpret string as a salt specifier, if no etype
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is set, this sets default values */
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/* XXX should perhaps use string_to_salttype, but that
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interface sucks */
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if(strcmp(buf[i], "pw-salt") == 0) {
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if(enctypes == NULL) {
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enctypes = all_etypes;
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num_enctypes = sizeof(all_etypes)/sizeof(all_etypes[0]);
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}
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salt->salttype = KRB5_PW_SALT;
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} else if(strcmp(buf[i], "afs3-salt") == 0) {
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if(enctypes == NULL) {
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enctypes = des_etypes;
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num_enctypes = sizeof(des_etypes)/sizeof(des_etypes[0]);
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}
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salt->salttype = KRB5_AFS3_SALT;
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}
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continue;
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}
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{
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/* if there is a final string, use it as the string to
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salt with, this is mostly useful with null salt for
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v4 compat, and a cell name for afs compat */
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salt->saltvalue.data = strdup(buf[i]);
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if (salt->saltvalue.data == NULL) {
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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salt->saltvalue.length = strlen(buf[i]);
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}
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}
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if(enctypes == NULL || salt->salttype == 0) {
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krb5_set_error_message(context, EINVAL, "bad value for default_keys `%s'", key);
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return EINVAL;
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}
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/* if no salt was specified make up default salt */
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if(salt->saltvalue.data == NULL) {
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if(salt->salttype == KRB5_PW_SALT)
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ret = krb5_get_pw_salt(context, principal, salt);
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else if(salt->salttype == KRB5_AFS3_SALT) {
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krb5_const_realm realm = krb5_principal_get_realm(context, principal);
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salt->saltvalue.data = strdup(realm);
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if(salt->saltvalue.data == NULL) {
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krb5_set_error_message(context, ENOMEM,
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"out of memory while "
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"parsing salt specifiers");
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return ENOMEM;
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}
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strlwr(salt->saltvalue.data);
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salt->saltvalue.length = strlen(realm);
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}
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}
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*ret_enctypes = malloc(sizeof(enctypes[0]) * num_enctypes);
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if (*ret_enctypes == NULL) {
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krb5_free_salt(context, *salt);
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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memcpy(*ret_enctypes, enctypes, sizeof(enctypes[0]) * num_enctypes);
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*ret_num_enctypes = num_enctypes;
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return 0;
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}
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static krb5_error_code
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add_enctype_to_key_set(Key **key_set, size_t *nkeyset,
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krb5_enctype enctype, krb5_salt *salt)
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{
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krb5_error_code ret;
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Key key, *tmp;
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memset(&key, 0, sizeof(key));
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tmp = realloc(*key_set, (*nkeyset + 1) * sizeof((*key_set)[0]));
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if (tmp == NULL)
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return ENOMEM;
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*key_set = tmp;
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key.key.keytype = enctype;
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key.key.keyvalue.length = 0;
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key.key.keyvalue.data = NULL;
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if (salt) {
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key.salt = calloc(1, sizeof(*key.salt));
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if (key.salt == NULL) {
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free_Key(&key);
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return ENOMEM;
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}
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key.salt->type = salt->salttype;
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krb5_data_zero (&key.salt->salt);
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ret = krb5_data_copy(&key.salt->salt,
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salt->saltvalue.data,
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salt->saltvalue.length);
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if (ret) {
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free_Key(&key);
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return ret;
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}
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} else
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key.salt = NULL;
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(*key_set)[*nkeyset] = key;
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*nkeyset += 1;
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return 0;
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}
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/*
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* Generate the `key_set' from the [kadmin]default_keys statement. If
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* `no_salt' is set, salt is not important (and will not be set) since
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* it's random keys that is going to be created.
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*/
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krb5_error_code
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hdb_generate_key_set(krb5_context context, krb5_principal principal,
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Key **ret_key_set, size_t *nkeyset, int no_salt)
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{
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char **ktypes, **kp;
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krb5_error_code ret;
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Key *k, *key_set;
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size_t i, j;
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static const char *default_keytypes[] = {
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"aes256-cts-hmac-sha1-96:pw-salt",
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"des3-cbc-sha1:pw-salt",
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"arcfour-hmac-md5:pw-salt",
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NULL
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};
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ktypes = krb5_config_get_strings(context, NULL, "kadmin",
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"default_keys", NULL);
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if (ktypes == NULL)
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ktypes = (char **)(intptr_t)default_keytypes;
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*ret_key_set = key_set = NULL;
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*nkeyset = 0;
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ret = 0;
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for(kp = ktypes; kp && *kp; kp++) {
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const char *p;
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krb5_salt salt;
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krb5_enctype *enctypes;
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size_t num_enctypes;
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p = *kp;
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/* check alias */
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if(strcmp(p, "v5") == 0)
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p = "pw-salt";
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else if(strcmp(p, "v4") == 0)
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p = "des:pw-salt:";
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else if(strcmp(p, "afs") == 0 || strcmp(p, "afs3") == 0)
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p = "des:afs3-salt";
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else if (strcmp(p, "arcfour-hmac-md5") == 0)
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p = "arcfour-hmac-md5:pw-salt";
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memset(&salt, 0, sizeof(salt));
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ret = parse_key_set(context, p,
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&enctypes, &num_enctypes, &salt, principal);
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if (ret) {
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krb5_warn(context, ret, "bad value for default_keys `%s'", *kp);
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ret = 0;
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continue;
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}
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for (i = 0; i < num_enctypes; i++) {
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/* find duplicates */
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for (j = 0; j < *nkeyset; j++) {
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k = &key_set[j];
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if (k->key.keytype == enctypes[i]) {
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if (no_salt)
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break;
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if (k->salt == NULL && salt.salttype == KRB5_PW_SALT)
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break;
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if (k->salt->type == salt.salttype &&
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k->salt->salt.length == salt.saltvalue.length &&
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memcmp(k->salt->salt.data, salt.saltvalue.data,
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salt.saltvalue.length) == 0)
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break;
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}
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}
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/* not a duplicate, lets add it */
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if (j == *nkeyset) {
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ret = add_enctype_to_key_set(&key_set, nkeyset, enctypes[i],
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no_salt ? NULL : &salt);
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if (ret) {
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free(enctypes);
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krb5_free_salt(context, salt);
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goto out;
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}
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}
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}
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free(enctypes);
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krb5_free_salt(context, salt);
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}
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*ret_key_set = key_set;
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out:
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if (ktypes != (char **)(intptr_t)default_keytypes)
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krb5_config_free_strings(ktypes);
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if (ret) {
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krb5_warn(context, ret,
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"failed to parse the [kadmin]default_keys values");
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for (i = 0; i < *nkeyset; i++)
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free_Key(&key_set[i]);
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free(key_set);
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} else if (*nkeyset == 0) {
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krb5_warnx(context,
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"failed to parse any of the [kadmin]default_keys values");
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ret = EINVAL; /* XXX */
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}
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return ret;
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}
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krb5_error_code
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hdb_generate_key_set_password(krb5_context context,
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krb5_principal principal,
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const char *password,
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Key **keys, size_t *num_keys)
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{
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krb5_error_code ret;
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size_t i;
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ret = hdb_generate_key_set(context, principal,
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keys, num_keys, 0);
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if (ret)
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return ret;
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for (i = 0; i < (*num_keys); i++) {
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krb5_salt salt;
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salt.salttype = (*keys)[i].salt->type;
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salt.saltvalue.length = (*keys)[i].salt->salt.length;
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salt.saltvalue.data = (*keys)[i].salt->salt.data;
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ret = krb5_string_to_key_salt (context,
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(*keys)[i].key.keytype,
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password,
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salt,
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&(*keys)[i].key);
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if(ret)
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break;
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}
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if(ret) {
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hdb_free_keys (context, *num_keys, *keys);
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return ret;
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}
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return ret;
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}
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