-/*
+/*
Unix SMB/CIFS implementation.
Kerberos utility functions for GENSEC
-
+
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
-
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "system/kerberos.h"
#include "auth/kerberos/kerberos.h"
#include "auth/credentials/credentials.h"
-#include "auth/credentials/credentials_proto.h"
#include "auth/credentials/credentials_krb5.h"
#include "auth/kerberos/kerberos_credentials.h"
#include "auth/kerberos/kerberos_util.h"
return 0;
}
+ /*
+ * Start with talloc(), talloc_reference() and only then call
+ * krb5_parse_name(). If any of them fails, the cleanup code is simpler.
+ */
+ mem_ctx = talloc(parent_ctx, struct principal_container);
+ if (!mem_ctx) {
+ (*error_string) = error_message(ENOMEM);
+ return ENOMEM;
+ }
+
+ mem_ctx->smb_krb5_context = talloc_reference(mem_ctx,
+ smb_krb5_context);
+ if (mem_ctx->smb_krb5_context == NULL) {
+ (*error_string) = error_message(ENOMEM);
+ talloc_free(mem_ctx);
+ return ENOMEM;
+ }
+
ret = krb5_parse_name(smb_krb5_context->krb5_context,
princ_string, princ);
(*error_string) = smb_get_krb5_error_message(
smb_krb5_context->krb5_context,
ret, parent_ctx);
+ talloc_free(mem_ctx);
return ret;
}
- mem_ctx = talloc(parent_ctx, struct principal_container);
- if (!mem_ctx) {
- (*error_string) = error_message(ENOMEM);
- return ENOMEM;
- }
-
- /* This song-and-dance effectivly puts the principal
- * into talloc, so we can't loose it. */
- mem_ctx->smb_krb5_context = talloc_reference(mem_ctx,
- smb_krb5_context);
+ /* This song-and-dance effectively puts the principal
+ * into talloc, so we can't lose it. */
mem_ctx->principal = *princ;
talloc_set_destructor(mem_ctx, free_principal);
return 0;
smb_krb5_context, princ, error_string);
}
+krb5_error_code smb_krb5_create_principals_array(TALLOC_CTX *mem_ctx,
+ krb5_context context,
+ const char *account_name,
+ const char *realm,
+ uint32_t num_spns,
+ const char *spns[],
+ uint32_t *pnum_principals,
+ krb5_principal **pprincipals,
+ const char **error_string)
+{
+ krb5_error_code code;
+ TALLOC_CTX *tmp_ctx;
+ uint32_t num_principals = 0;
+ krb5_principal *principals;
+ uint32_t i;
+
+ tmp_ctx = talloc_new(mem_ctx);
+ if (tmp_ctx == NULL) {
+ *error_string = "Cannot allocate tmp_ctx";
+ return ENOMEM;
+ }
+
+ if (realm == NULL) {
+ *error_string = "Cannot create principal without a realm";
+ code = EINVAL;
+ goto done;
+ }
+
+ if (account_name == NULL && (num_spns == 0 || spns == NULL)) {
+ *error_string = "Cannot create principal without an account or SPN";
+ code = EINVAL;
+ goto done;
+ }
+
+ if (account_name != NULL && account_name[0] != '\0') {
+ num_principals++;
+ }
+ num_principals += num_spns;
+
+ principals = talloc_zero_array(tmp_ctx,
+ krb5_principal,
+ num_principals);
+ if (principals == NULL) {
+ *error_string = "Cannot allocate principals";
+ code = ENOMEM;
+ goto done;
+ }
+
+ for (i = 0; i < num_spns; i++) {
+ code = krb5_parse_name(context, spns[i], &(principals[i]));
+ if (code != 0) {
+ *error_string = smb_get_krb5_error_message(context,
+ code,
+ mem_ctx);
+ goto done;
+ }
+ }
+
+ if (account_name != NULL && account_name[0] != '\0') {
+ code = smb_krb5_make_principal(context,
+ &(principals[i]),
+ realm,
+ account_name,
+ NULL);
+ if (code != 0) {
+ *error_string = smb_get_krb5_error_message(context,
+ code,
+ mem_ctx);
+ goto done;
+ }
+ }
+
+ if (pnum_principals != NULL) {
+ *pnum_principals = num_principals;
+
+ if (pprincipals != NULL) {
+ *pprincipals = talloc_steal(mem_ctx, principals);
+ }
+ }
+
+ code = 0;
+done:
+ talloc_free(tmp_ctx);
+ return code;
+}
+
/**
* Return a freshly allocated ccache (destroyed by destructor on child
- * of parent_ctx), for a given set of client credentials
+ * of parent_ctx), for a given set of client credentials
*/
krb5_error_code kinit_to_ccache(TALLOC_CTX *parent_ctx,
struct cli_credentials *credentials,
struct smb_krb5_context *smb_krb5_context,
+ struct loadparm_context *lp_ctx,
struct tevent_context *event_ctx,
krb5_ccache ccache,
enum credentials_obtained *obtained,
int tries;
TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
krb5_get_init_creds_opt *krb_options;
+ struct cli_credentials *fast_creds;
if (!mem_ctx) {
(*error_string) = strerror(ENOMEM);
* flags:
* KRB5_INIT_CREDS_NO_C_CANON_CHECK;
* KRB5_INIT_CREDS_NO_C_NO_EKU_CHECK;
+ *
+ * On MIT: Set pkinit_eku_checking to none
*/
krb5_get_init_creds_opt_set_win2k(smb_krb5_context->krb5_context,
krb_options, true);
+ krb5_get_init_creds_opt_set_canonicalize(smb_krb5_context->krb5_context,
+ krb_options, true);
+#else /* MIT */
+ krb5_get_init_creds_opt_set_canonicalize(krb_options, true);
+#endif
+
+ fast_creds = cli_credentials_get_krb5_fast_armor_credentials(credentials);
+
+ if (fast_creds != NULL) {
+#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_FAST_CCACHE
+ struct ccache_container *fast_ccc = NULL;
+ const char *fast_error_string = NULL;
+ ret = cli_credentials_get_ccache(fast_creds, event_ctx, lp_ctx, &fast_ccc, &fast_error_string);
+ if (ret != 0) {
+ (*error_string) = talloc_asprintf(credentials,
+ "Obtaining the Kerberos FAST armor credentials failed: %s\n",
+ fast_error_string);
+ return ret;
+ }
+ krb5_get_init_creds_opt_set_fast_ccache(smb_krb5_context->krb5_context,
+ krb_options,
+ fast_ccc->ccache);
+#else
+ *error_string = talloc_strdup(credentials,
+ "Using Kerberos FAST "
+ "armor credentials not possible "
+ "with this Kerberos library. "
+ "Modern MIT or Samba's embedded "
+ "Heimdal required");
+ return EINVAL;
+#endif
+ }
+
+#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_FAST_FLAGS
+ {
+ bool require_fast;
+ /*
+ * This ensures that if FAST was required, but no armor
+ * credentials cache was specified, we proceed with (eg)
+ * anonymous PKINIT
+ */
+ require_fast = cli_credentials_get_krb5_require_fast_armor(credentials);
+ if (require_fast) {
+ krb5_get_init_creds_opt_set_fast_flags(smb_krb5_context->krb5_context,
+ krb_options,
+ KRB5_FAST_REQUIRED);
+ }
+ }
#endif
tries = 2;
ret = smb_krb5_context_set_event_ctx(smb_krb5_context, event_ctx, &previous_ev);
if (ret) {
talloc_free(mem_ctx);
+ krb5_get_init_creds_opt_free(smb_krb5_context->krb5_context, krb_options);
return ret;
}
#endif
if (password) {
if (impersonate_principal) {
-#ifdef SAMBA4_USES_HEIMDAL
- ret = kerberos_kinit_s4u2_cc(
- smb_krb5_context->krb5_context,
- ccache, princ, password,
- impersonate_principal,
- self_service, target_service,
- krb_options, NULL, &kdc_time);
-#else
- talloc_free(mem_ctx);
- (*error_string) = "INTERNAL error: s4u2 ops "
- "are not supported with MIT build yet";
- return EINVAL;
-#endif
+ ret = smb_krb5_kinit_s4u2_ccache(smb_krb5_context->krb5_context,
+ ccache,
+ princ,
+ password,
+ impersonate_principal,
+ self_service,
+ target_service,
+ krb_options,
+ NULL,
+ &kdc_time);
} else {
- ret = kerberos_kinit_password_cc(
- smb_krb5_context->krb5_context,
- ccache, princ, password,
- target_service,
- krb_options, NULL, &kdc_time);
+ ret = smb_krb5_kinit_password_ccache(smb_krb5_context->krb5_context,
+ ccache,
+ princ,
+ password,
+ target_service,
+ krb_options,
+ NULL,
+ &kdc_time);
}
} else if (impersonate_principal) {
talloc_free(mem_ctx);
(*error_string) = "INTERNAL error: Cannot impersonate principal with just a keyblock. A password must be specified in the credentials";
+ krb5_get_init_creds_opt_free(smb_krb5_context->krb5_context, krb_options);
+#ifdef SAMBA4_USES_HEIMDAL
+ smb_krb5_context_remove_event_ctx(smb_krb5_context, previous_ev, event_ctx);
+#endif
return EINVAL;
} else {
/* No password available, try to use a keyblock instead */
-
+
krb5_keyblock keyblock;
const struct samr_Password *mach_pwd;
mach_pwd = cli_credentials_get_nt_hash(credentials, mem_ctx);
}
ret = smb_krb5_keyblock_init_contents(smb_krb5_context->krb5_context,
ENCTYPE_ARCFOUR_HMAC,
- mach_pwd->hash, sizeof(mach_pwd->hash),
+ mach_pwd->hash, sizeof(mach_pwd->hash),
&keyblock);
-
+
if (ret == 0) {
- ret = kerberos_kinit_keyblock_cc(smb_krb5_context->krb5_context, ccache,
- princ, &keyblock,
- target_service, krb_options,
- NULL, &kdc_time);
+ ret = smb_krb5_kinit_keyblock_ccache(smb_krb5_context->krb5_context,
+ ccache,
+ princ,
+ &keyblock,
+ target_service,
+ krb_options,
+ NULL,
+ &kdc_time);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &keyblock);
}
}
DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
krb5_set_real_time(smb_krb5_context->krb5_context, t + time_offset + 1, 0);
}
-
+
if (ret == KRB5KDC_ERR_PREAUTH_FAILED && cli_credentials_wrong_password(credentials)) {
ret = kinit_to_ccache(parent_ctx,
credentials,
smb_krb5_context,
+ lp_ctx,
event_ctx,
ccache, obtained,
error_string);
ret, mem_ctx));
talloc_free(mem_ctx);
return ret;
- }
+ }
+
+ DEBUG(10,("kinit for %s succeeded\n",
+ cli_credentials_get_principal(credentials, mem_ctx)));
+
+
talloc_free(mem_ctx);
return 0;
}
krb5_keytab keytab;
krb5_error_code ret;
+ /*
+ * Start with talloc(), talloc_reference() and only then call
+ * krb5_kt_resolve(). If any of them fails, the cleanup code is simpler.
+ */
+ *ktc = talloc(mem_ctx, struct keytab_container);
+ if (!*ktc) {
+ return ENOMEM;
+ }
+
+ (*ktc)->smb_krb5_context = talloc_reference(*ktc, smb_krb5_context);
+ if ((*ktc)->smb_krb5_context == NULL) {
+ TALLOC_FREE(*ktc);
+ return ENOMEM;
+ }
+
if (opt_keytab) {
keytab = opt_keytab;
} else {
smb_get_krb5_error_message(
smb_krb5_context->krb5_context,
ret, mem_ctx)));
+ TALLOC_FREE(*ktc);
return ret;
}
}
- *ktc = talloc(mem_ctx, struct keytab_container);
- if (!*ktc) {
- return ENOMEM;
- }
-
- (*ktc)->smb_krb5_context = talloc_reference(*ktc, smb_krb5_context);
(*ktc)->keytab = keytab;
(*ktc)->password_based = false;
talloc_set_destructor(*ktc, free_keytab_container);
return 0;
}
+
+/*
+ * Walk the keytab, looking for entries of this principal name,
+ * with KVNO other than current kvno -1.
+ *
+ * These entries are now stale,
+ * we only keep the current and previous entries around.
+ *
+ * Inspired by the code in Samba3 for 'use kerberos keytab'.
+ */
+krb5_error_code smb_krb5_remove_obsolete_keytab_entries(TALLOC_CTX *mem_ctx,
+ krb5_context context,
+ krb5_keytab keytab,
+ uint32_t num_principals,
+ krb5_principal *principals,
+ krb5_kvno kvno,
+ bool *found_previous,
+ const char **error_string)
+{
+ TALLOC_CTX *tmp_ctx;
+ krb5_error_code code;
+ krb5_kt_cursor cursor;
+
+ tmp_ctx = talloc_new(mem_ctx);
+ if (tmp_ctx == NULL) {
+ *error_string = "Cannot allocate tmp_ctx";
+ return ENOMEM;
+ }
+
+ *found_previous = true;
+
+ code = krb5_kt_start_seq_get(context, keytab, &cursor);
+ switch (code) {
+ case 0:
+ break;
+#ifdef HEIM_ERR_OPNOTSUPP
+ case HEIM_ERR_OPNOTSUPP:
+#endif
+ case ENOENT:
+ case KRB5_KT_END:
+ /* no point enumerating if there isn't anything here */
+ code = 0;
+ goto done;
+ default:
+ *error_string = talloc_asprintf(mem_ctx,
+ "failed to open keytab for read of old entries: %s\n",
+ smb_get_krb5_error_message(context, code, tmp_ctx));
+ goto done;
+ }
+
+ do {
+ krb5_kvno old_kvno = kvno - 1;
+ krb5_keytab_entry entry;
+ bool matched = false;
+ uint32_t i;
+
+ code = krb5_kt_next_entry(context, keytab, &entry, &cursor);
+ if (code) {
+ break;
+ }
+
+ for (i = 0; i < num_principals; i++) {
+ krb5_boolean ok;
+
+ ok = smb_krb5_kt_compare(context,
+ &entry,
+ principals[i],
+ 0,
+ 0);
+ if (ok) {
+ matched = true;
+ break;
+ }
+ }
+
+ if (!matched) {
+ /*
+ * Free the entry, it wasn't the one we were looking
+ * for anyway
+ */
+ krb5_kt_free_entry(context, &entry);
+ /* Make sure we do not double free */
+ ZERO_STRUCT(entry);
+ continue;
+ }
+
+ /*
+ * Delete it, if it is not kvno - 1.
+ *
+ * Some keytab files store the kvno only in 8bits. Limit the
+ * compare to 8bits, so that we don't miss old keys and delete
+ * them.
+ */
+ if ((entry.vno & 0xff) != (old_kvno & 0xff)) {
+ krb5_error_code rc;
+
+ /* Release the enumeration. We are going to
+ * have to start this from the top again,
+ * because deletes during enumeration may not
+ * always be consistent.
+ *
+ * Also, the enumeration locks a FILE: keytab
+ */
+ krb5_kt_end_seq_get(context, keytab, &cursor);
+
+ code = krb5_kt_remove_entry(context, keytab, &entry);
+ krb5_kt_free_entry(context, &entry);
+
+ /* Make sure we do not double free */
+ ZERO_STRUCT(entry);
+
+ /* Deleted: Restart from the top */
+ rc = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (rc != 0) {
+ krb5_kt_free_entry(context, &entry);
+
+ /* Make sure we do not double free */
+ ZERO_STRUCT(entry);
+
+ DEBUG(1, ("failed to restart enumeration of keytab: %s\n",
+ smb_get_krb5_error_message(context,
+ code,
+ tmp_ctx)));
+
+ talloc_free(tmp_ctx);
+ return rc;
+ }
+
+ if (code != 0) {
+ break;
+ }
+
+ } else {
+ *found_previous = true;
+ }
+
+ /* Free the entry, we don't need it any more */
+ krb5_kt_free_entry(context, &entry);
+ /* Make sure we do not double free */
+ ZERO_STRUCT(entry);
+ } while (code == 0);
+
+ krb5_kt_end_seq_get(context, keytab, &cursor);
+
+ switch (code) {
+ case 0:
+ break;
+ case ENOENT:
+ case KRB5_KT_END:
+ break;
+ default:
+ *error_string = talloc_asprintf(mem_ctx,
+ "failed in deleting old entries for principal: %s\n",
+ smb_get_krb5_error_message(context,
+ code,
+ tmp_ctx));
+ goto done;
+ }
+
+ code = 0;
+done:
+ talloc_free(tmp_ctx);
+ return code;
+}
+
+/*
+ * Walk the keytab, looking for entries of this principal name,
+ * with KVNO and key equal
+ *
+ * These entries do not need to be replaced, so we want to tell the caller not to add them again
+ *
+ * Inspired by the code in Samba3 for 'use kerberos keytab'.
+ */
+krb5_error_code smb_krb5_is_exact_entry_in_keytab(TALLOC_CTX *mem_ctx,
+ krb5_context context,
+ krb5_keytab keytab,
+ krb5_keytab_entry *to_match,
+ bool *found,
+ const char **error_string)
+{
+ TALLOC_CTX *tmp_ctx;
+ krb5_error_code code;
+ krb5_kt_cursor cursor;
+
+ tmp_ctx = talloc_new(mem_ctx);
+ if (tmp_ctx == NULL) {
+ *error_string = "Cannot allocate tmp_ctx";
+ return ENOMEM;
+ }
+
+ *found = false;
+
+ code = krb5_kt_start_seq_get(context, keytab, &cursor);
+ switch (code) {
+ case 0:
+ break;
+#ifdef HEIM_ERR_OPNOTSUPP
+ case HEIM_ERR_OPNOTSUPP:
+#endif
+ case ENOENT:
+ case KRB5_KT_END:
+ /* no point enumerating if there isn't anything here */
+ code = 0;
+ goto done;
+ default:
+ *error_string = talloc_asprintf(mem_ctx,
+ "failed to open keytab for read of existing entries: %s\n",
+ smb_get_krb5_error_message(context, code, tmp_ctx));
+ goto done;
+ }
+
+ do {
+ krb5_keytab_entry entry;
+ bool matched = false;
+ krb5_boolean ok;
+
+ code = krb5_kt_next_entry(context, keytab, &entry, &cursor);
+ if (code) {
+ break;
+ }
+
+ ok = smb_krb5_kt_compare(context,
+ &entry,
+ to_match->principal,
+ to_match->vno,
+ KRB5_KEY_TYPE(KRB5_KT_KEY(to_match)));
+ if (ok) {
+ /* This is not a security check, constant time is not required */
+ if ((KRB5_KEY_LENGTH(KRB5_KT_KEY(&entry)) == KRB5_KEY_LENGTH(KRB5_KT_KEY(to_match)))
+ && memcmp(KRB5_KEY_DATA(KRB5_KT_KEY(&entry)), KRB5_KEY_DATA(KRB5_KT_KEY(to_match)),
+ KRB5_KEY_LENGTH(KRB5_KT_KEY(&entry))) == 0) {
+ matched = true;
+ }
+ }
+
+ /* Free the entry, we don't need it any more */
+ krb5_kt_free_entry(context, &entry);
+ /* Make sure we do not double free */
+ ZERO_STRUCT(entry);
+ if (matched) {
+ *found = true;
+ break;
+ }
+ } while (code == 0);
+
+ krb5_kt_end_seq_get(context, keytab, &cursor);
+
+ switch (code) {
+ case 0:
+ break;
+ case ENOENT:
+ case KRB5_KT_END:
+ break;
+ default:
+ *error_string = talloc_asprintf(mem_ctx,
+ "failed in checking old entries for principal: %s\n",
+ smb_get_krb5_error_message(context,
+ code,
+ tmp_ctx));
+ goto done;
+ }
+
+ code = 0;
+done:
+ talloc_free(tmp_ctx);
+ return code;
+}
git.samba.org / samba.git / blobdiff