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-rw-r--r--crypto/heimdal/lib/hdb/keys.c398
1 files changed, 398 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/hdb/keys.c b/crypto/heimdal/lib/hdb/keys.c
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+/*
+ * Copyright (c) 1997 - 2001, 2003 - 2004 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "hdb_locl.h"
+
+RCSID("$Id: keys.c 22071 2007-11-14 20:04:50Z lha $");
+
+/*
+ * free all the memory used by (len, keys)
+ */
+
+void
+hdb_free_keys (krb5_context context, int len, Key *keys)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ free(keys[i].mkvno);
+ keys[i].mkvno = NULL;
+ if (keys[i].salt != NULL) {
+ free_Salt(keys[i].salt);
+ free(keys[i].salt);
+ keys[i].salt = NULL;
+ }
+ krb5_free_keyblock_contents(context, &keys[i].key);
+ }
+ free (keys);
+}
+
+/*
+ * for each entry in `default_keys' try to parse it as a sequence
+ * of etype:salttype:salt, syntax of this if something like:
+ * [(des|des3|etype):](pw-salt|afs3)[:string], if etype is omitted it
+ * means all etypes, and if string is omitted is means the default
+ * string (for that principal). Additional special values:
+ * v5 == pw-salt, and
+ * v4 == des:pw-salt:
+ * afs or afs3 == des:afs3-salt
+ */
+
+/* the 3 DES types must be first */
+static const krb5_enctype all_etypes[] = {
+ ETYPE_DES_CBC_MD5,
+ ETYPE_DES_CBC_MD4,
+ ETYPE_DES_CBC_CRC,
+ ETYPE_AES256_CTS_HMAC_SHA1_96,
+ ETYPE_ARCFOUR_HMAC_MD5,
+ ETYPE_DES3_CBC_SHA1
+};
+
+static krb5_error_code
+parse_key_set(krb5_context context, const char *key,
+ krb5_enctype **ret_enctypes, size_t *ret_num_enctypes,
+ krb5_salt *salt, krb5_principal principal)
+{
+ const char *p;
+ char buf[3][256];
+ int num_buf = 0;
+ int i, num_enctypes = 0;
+ krb5_enctype e;
+ const krb5_enctype *enctypes = NULL;
+ krb5_error_code ret;
+
+ p = key;
+
+ *ret_enctypes = NULL;
+ *ret_num_enctypes = 0;
+
+ /* split p in a list of :-separated strings */
+ for(num_buf = 0; num_buf < 3; num_buf++)
+ if(strsep_copy(&p, ":", buf[num_buf], sizeof(buf[num_buf])) == -1)
+ break;
+
+ salt->saltvalue.data = NULL;
+ salt->saltvalue.length = 0;
+
+ for(i = 0; i < num_buf; i++) {
+ if(enctypes == NULL && num_buf > 1) {
+ /* this might be a etype specifier */
+ /* XXX there should be a string_to_etypes handling
+ special cases like `des' and `all' */
+ if(strcmp(buf[i], "des") == 0) {
+ enctypes = all_etypes;
+ num_enctypes = 3;
+ } else if(strcmp(buf[i], "des3") == 0) {
+ e = ETYPE_DES3_CBC_SHA1;
+ enctypes = &e;
+ num_enctypes = 1;
+ } else {
+ ret = krb5_string_to_enctype(context, buf[i], &e);
+ if (ret == 0) {
+ enctypes = &e;
+ num_enctypes = 1;
+ } else
+ return ret;
+ }
+ continue;
+ }
+ if(salt->salttype == 0) {
+ /* interpret string as a salt specifier, if no etype
+ is set, this sets default values */
+ /* XXX should perhaps use string_to_salttype, but that
+ interface sucks */
+ if(strcmp(buf[i], "pw-salt") == 0) {
+ if(enctypes == NULL) {
+ enctypes = all_etypes;
+ num_enctypes = sizeof(all_etypes)/sizeof(all_etypes[0]);
+ }
+ salt->salttype = KRB5_PW_SALT;
+ } else if(strcmp(buf[i], "afs3-salt") == 0) {
+ if(enctypes == NULL) {
+ enctypes = all_etypes;
+ num_enctypes = 3;
+ }
+ salt->salttype = KRB5_AFS3_SALT;
+ }
+ continue;
+ }
+
+ {
+ /* if there is a final string, use it as the string to
+ salt with, this is mostly useful with null salt for
+ v4 compat, and a cell name for afs compat */
+ salt->saltvalue.data = strdup(buf[i]);
+ if (salt->saltvalue.data == NULL) {
+ krb5_set_error_string(context, "out of memory");
+ return ENOMEM;
+ }
+ salt->saltvalue.length = strlen(buf[i]);
+ }
+ }
+
+ if(enctypes == NULL || salt->salttype == 0) {
+ krb5_set_error_string(context, "bad value for default_keys `%s'", key);
+ return EINVAL;
+ }
+
+ /* if no salt was specified make up default salt */
+ if(salt->saltvalue.data == NULL) {
+ if(salt->salttype == KRB5_PW_SALT)
+ ret = krb5_get_pw_salt(context, principal, salt);
+ else if(salt->salttype == KRB5_AFS3_SALT) {
+ krb5_realm *realm = krb5_princ_realm(context, principal);
+ salt->saltvalue.data = strdup(*realm);
+ if(salt->saltvalue.data == NULL) {
+ krb5_set_error_string(context, "out of memory while "
+ "parsing salt specifiers");
+ return ENOMEM;
+ }
+ strlwr(salt->saltvalue.data);
+ salt->saltvalue.length = strlen(*realm);
+ }
+ }
+
+ *ret_enctypes = malloc(sizeof(enctypes[0]) * num_enctypes);
+ if (*ret_enctypes == NULL) {
+ krb5_free_salt(context, *salt);
+ krb5_set_error_string(context, "out of memory");
+ return ENOMEM;
+ }
+ memcpy(*ret_enctypes, enctypes, sizeof(enctypes[0]) * num_enctypes);
+ *ret_num_enctypes = num_enctypes;
+
+ return 0;
+}
+
+static krb5_error_code
+add_enctype_to_key_set(Key **key_set, size_t *nkeyset,
+ krb5_enctype enctype, krb5_salt *salt)
+{
+ krb5_error_code ret;
+ Key key, *tmp;
+
+ memset(&key, 0, sizeof(key));
+
+ tmp = realloc(*key_set, (*nkeyset + 1) * sizeof((*key_set)[0]));
+ if (tmp == NULL)
+ return ENOMEM;
+
+ *key_set = tmp;
+
+ key.key.keytype = enctype;
+ key.key.keyvalue.length = 0;
+ key.key.keyvalue.data = NULL;
+
+ if (salt) {
+ key.salt = malloc(sizeof(*key.salt));
+ if (key.salt == NULL) {
+ free_Key(&key);
+ return ENOMEM;
+ }
+
+ key.salt->type = salt->salttype;
+ krb5_data_zero (&key.salt->salt);
+
+ ret = krb5_data_copy(&key.salt->salt,
+ salt->saltvalue.data,
+ salt->saltvalue.length);
+ if (ret) {
+ free_Key(&key);
+ return ret;
+ }
+ } else
+ key.salt = NULL;
+
+ (*key_set)[*nkeyset] = key;
+
+ *nkeyset += 1;
+
+ return 0;
+}
+
+
+/*
+ * Generate the `key_set' from the [kadmin]default_keys statement. If
+ * `no_salt' is set, salt is not important (and will not be set) since
+ * it's random keys that is going to be created.
+ */
+
+krb5_error_code
+hdb_generate_key_set(krb5_context context, krb5_principal principal,
+ Key **ret_key_set, size_t *nkeyset, int no_salt)
+{
+ char **ktypes, **kp;
+ krb5_error_code ret;
+ Key *k, *key_set;
+ int i, j;
+ char *default_keytypes[] = {
+ "des:pw-salt",
+ "aes256-cts-hmac-sha1-96:pw-salt",
+ "des3-cbc-sha1:pw-salt",
+ "arcfour-hmac-md5:pw-salt",
+ NULL
+ };
+
+ ktypes = krb5_config_get_strings(context, NULL, "kadmin",
+ "default_keys", NULL);
+ if (ktypes == NULL)
+ ktypes = default_keytypes;
+
+ if (ktypes == NULL)
+ abort();
+
+ *ret_key_set = key_set = NULL;
+ *nkeyset = 0;
+
+ ret = 0;
+
+ for(kp = ktypes; kp && *kp; kp++) {
+ const char *p;
+ krb5_salt salt;
+ krb5_enctype *enctypes;
+ size_t num_enctypes;
+
+ p = *kp;
+ /* check alias */
+ if(strcmp(p, "v5") == 0)
+ p = "pw-salt";
+ else if(strcmp(p, "v4") == 0)
+ p = "des:pw-salt:";
+ else if(strcmp(p, "afs") == 0 || strcmp(p, "afs3") == 0)
+ p = "des:afs3-salt";
+ else if (strcmp(p, "arcfour-hmac-md5") == 0)
+ p = "arcfour-hmac-md5:pw-salt";
+
+ memset(&salt, 0, sizeof(salt));
+
+ ret = parse_key_set(context, p,
+ &enctypes, &num_enctypes, &salt, principal);
+ if (ret) {
+ krb5_warn(context, ret, "bad value for default_keys `%s'", *kp);
+ ret = 0;
+ continue;
+ }
+
+ for (i = 0; i < num_enctypes; i++) {
+ /* find duplicates */
+ for (j = 0; j < *nkeyset; j++) {
+
+ k = &key_set[j];
+
+ if (k->key.keytype == enctypes[i]) {
+ if (no_salt)
+ break;
+ if (k->salt == NULL && salt.salttype == KRB5_PW_SALT)
+ break;
+ if (k->salt->type == salt.salttype &&
+ k->salt->salt.length == salt.saltvalue.length &&
+ memcmp(k->salt->salt.data, salt.saltvalue.data,
+ salt.saltvalue.length) == 0)
+ break;
+ }
+ }
+ /* not a duplicate, lets add it */
+ if (j == *nkeyset) {
+ ret = add_enctype_to_key_set(&key_set, nkeyset, enctypes[i],
+ no_salt ? NULL : &salt);
+ if (ret) {
+ free(enctypes);
+ krb5_free_salt(context, salt);
+ goto out;
+ }
+ }
+ }
+ free(enctypes);
+ krb5_free_salt(context, salt);
+ }
+
+ *ret_key_set = key_set;
+
+ out:
+ if (ktypes != default_keytypes)
+ krb5_config_free_strings(ktypes);
+
+ if (ret) {
+ krb5_warn(context, ret,
+ "failed to parse the [kadmin]default_keys values");
+
+ for (i = 0; i < *nkeyset; i++)
+ free_Key(&key_set[i]);
+ free(key_set);
+ } else if (*nkeyset == 0) {
+ krb5_warnx(context,
+ "failed to parse any of the [kadmin]default_keys values");
+ ret = EINVAL; /* XXX */
+ }
+
+ return ret;
+}
+
+
+krb5_error_code
+hdb_generate_key_set_password(krb5_context context,
+ krb5_principal principal,
+ const char *password,
+ Key **keys, size_t *num_keys)
+{
+ krb5_error_code ret;
+ int i;
+
+ ret = hdb_generate_key_set(context, principal,
+ keys, num_keys, 0);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < (*num_keys); i++) {
+ krb5_salt salt;
+
+ salt.salttype = (*keys)[i].salt->type;
+ salt.saltvalue.length = (*keys)[i].salt->salt.length;
+ salt.saltvalue.data = (*keys)[i].salt->salt.data;
+
+ ret = krb5_string_to_key_salt (context,
+ (*keys)[i].key.keytype,
+ password,
+ salt,
+ &(*keys)[i].key);
+
+ if(ret)
+ break;
+ }
+
+ if(ret) {
+ hdb_free_keys (context, *num_keys, *keys);
+ return ret;
+ }
+ return ret;
+}
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