s4:param: make sure secrets_db_connect() no longer creates on empty secrets.ldb
[bbaumbach/samba-autobuild/.git] / source4 / param / secrets.c
index 45d3765b7aa60136beb2da4c01f10043195ecfa1..1df8620f53a1237ebb13a3c0bd7651fe9a0216f4 100644 (file)
 #include "secrets.h"
 #include "param/param.h"
 #include "system/filesys.h"
-#include "tdb_wrap.h"
-#include "lib/ldb/include/ldb.h"
-#include "../tdb/include/tdb.h"
-#include "lib/util/util_tdb.h"
-#include "lib/util/util_ldb.h"
+#include "lib/tdb_wrap/tdb_wrap.h"
+#include "lib/ldb-samba/ldb_wrap.h"
+#include <ldb.h>
+#include "../lib/util/util_tdb.h"
 #include "librpc/gen_ndr/ndr_security.h"
+#include "dsdb/samdb/samdb.h"
 
 /**
- * Use a TDB to store an incrementing random seed.
- *
- * Initialised to the current pid, the very first time Samba starts,
- * and incremented by one each time it is needed.  
- * 
- * @note Not called by systems with a working /dev/urandom.
- */
-static void get_rand_seed(struct tdb_wrap *secretsdb, int *new_seed) 
+  create or connect to the secrets ldb
+*/
+struct ldb_context *secrets_db_create(TALLOC_CTX *mem_ctx,
+                                     struct loadparm_context *lp_ctx)
 {
-       *new_seed = getpid();
-       if (secretsdb != NULL) {
-               tdb_change_int32_atomic(secretsdb->tdb, "INFO/random_seed", new_seed, 1);
-       }
-}
-
-/**
- * open up the secrets database
- */
-struct tdb_wrap *secrets_init(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx)
-{
-       char *fname;
-       uint8_t dummy;
-       struct tdb_wrap *tdb;
-
-       fname = private_path(mem_ctx, lp_ctx, "secrets.tdb");
-
-       tdb = tdb_wrap_open(mem_ctx, fname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
-
-       if (!tdb) {
-               DEBUG(0,("Failed to open %s\n", fname));
-               talloc_free(fname);
-               return NULL;
-       }
-       talloc_free(fname);
-
-       /**
-        * Set a reseed function for the crypto random generator 
-        * 
-        * This avoids a problem where systems without /dev/urandom
-        * could send the same challenge to multiple clients
-        */
-       set_rand_reseed_callback((void (*) (void *, int *))get_rand_seed, tdb);
-
-       /* Ensure that the reseed is done now, while we are root, etc */
-       generate_random_buffer(&dummy, sizeof(dummy));
-
-       return tdb;
+       return ldb_wrap_connect(mem_ctx, NULL, lp_ctx, "secrets.ldb",
+                              NULL, NULL, 0);
 }
 
 /**
   connect to the secrets ldb
 */
 struct ldb_context *secrets_db_connect(TALLOC_CTX *mem_ctx,
-                                       struct event_context *ev_ctx,
                                        struct loadparm_context *lp_ctx)
 {
-       char *path;
-       const char *url;
-       struct ldb_context *ldb;
-
-       url = lp_secrets_url(lp_ctx);
-       if (!url || !url[0]) {
-               return NULL;
-       }
-
-       path = private_path(mem_ctx, lp_ctx, url);
-       if (!path) {
-               return NULL;
-       }
-
-       /* Secrets.ldb *must* always be local.  If we call for a
-        * system_session() we will recurse */
-       ldb = ldb_init(mem_ctx, ev_ctx);
-       if (!ldb) {
-               talloc_free(path);
-               return NULL;
-       }
-
-       ldb_set_modules_dir(ldb, 
-                           talloc_asprintf(ldb, "%s/ldb", lp_modulesdir(lp_ctx)));
-
-       if (ldb_connect(ldb, path, 0, NULL) != 0) {
-               talloc_free(path);
-               return NULL;
-       }
-
-       talloc_free(path);
-       
-       return ldb;
+       return ldb_wrap_connect(mem_ctx, NULL, lp_ctx, "secrets.ldb",
+                              NULL, NULL, LDB_FLG_DONT_CREATE_DB);
 }
 
 /**
@@ -129,64 +57,67 @@ struct ldb_context *secrets_db_connect(TALLOC_CTX *mem_ctx,
  * @return pointer to a SID object if the SID could be obtained, NULL otherwise
  */
 struct dom_sid *secrets_get_domain_sid(TALLOC_CTX *mem_ctx,
-                                      struct event_context *ev_ctx,
                                       struct loadparm_context *lp_ctx,
-                                      const char *domain)
+                                      const char *domain,
+                                      enum netr_SchannelType *sec_channel_type,
+                                      char **errstring)
 {
        struct ldb_context *ldb;
-       struct ldb_message **msgs;
+       struct ldb_message *msg;
        int ldb_ret;
-       const char *attrs[] = { "objectSid", NULL };
+       const char *attrs[] = { "objectSid", "secureChannelType", NULL };
        struct dom_sid *result = NULL;
        const struct ldb_val *v;
        enum ndr_err_code ndr_err;
 
-       ldb = secrets_db_connect(mem_ctx, ev_ctx, lp_ctx);
+       *errstring = NULL;
+
+       ldb = secrets_db_connect(mem_ctx, lp_ctx);
        if (ldb == NULL) {
                DEBUG(5, ("secrets_db_connect failed\n"));
                return NULL;
        }
 
-       ldb_ret = gendb_search(ldb, ldb,
-                              ldb_dn_new(mem_ctx, ldb, SECRETS_PRIMARY_DOMAIN_DN), 
-                              &msgs, attrs,
-                              SECRETS_PRIMARY_DOMAIN_FILTER, domain);
+       ldb_ret = dsdb_search_one(ldb, ldb, &msg,
+                             ldb_dn_new(mem_ctx, ldb, SECRETS_PRIMARY_DOMAIN_DN),
+                             LDB_SCOPE_ONELEVEL,
+                             attrs, 0, SECRETS_PRIMARY_DOMAIN_FILTER, domain);
 
-       if (ldb_ret == -1) {
-               DEBUG(5, ("Error searching for domain SID for %s: %s", 
-                         domain, ldb_errstring(ldb))); 
-               talloc_free(ldb);
+       if (ldb_ret != LDB_SUCCESS) {
+               *errstring = talloc_asprintf(mem_ctx, "Failed to find record for %s in %s: %s: %s", 
+                                            domain, (char *) ldb_get_opaque(ldb, "ldb_url"),
+                                            ldb_strerror(ldb_ret), ldb_errstring(ldb));
                return NULL;
        }
-
-       if (ldb_ret == 0) {
-               DEBUG(5, ("Did not find domain record for %s\n", domain));
-               talloc_free(ldb);
+       v = ldb_msg_find_ldb_val(msg, "objectSid");
+       if (v == NULL) {
+               *errstring = talloc_asprintf(mem_ctx, "Failed to find a SID on record for %s in %s", 
+                                            domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
                return NULL;
        }
 
-       if (ldb_ret > 1) {
-               DEBUG(5, ("Found more than one (%d) domain records for %s\n",
-                         ldb_ret, domain));
-               talloc_free(ldb);
-               return NULL;
+       if (sec_channel_type) {
+               int t;
+               t = ldb_msg_find_attr_as_int(msg, "secureChannelType", -1);
+               if (t == -1) {
+                       *errstring = talloc_asprintf(mem_ctx, "Failed to find secureChannelType for %s in %s",
+                                                    domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
+                       return NULL;
+               }
+               *sec_channel_type = t;
        }
 
-       v = ldb_msg_find_ldb_val(msgs[0], "objectSid");
-       if (v == NULL) {
-               DEBUG(0, ("Domain object for %s does not contain a SID!\n",
-                         domain));
-               return NULL;
-       }
        result = talloc(mem_ctx, struct dom_sid);
        if (result == NULL) {
                talloc_free(ldb);
                return NULL;
        }
 
-       ndr_err = ndr_pull_struct_blob(v, result, NULL, result,
+       ndr_err = ndr_pull_struct_blob(v, result, result,
                                       (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
        if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               *errstring = talloc_asprintf(mem_ctx, "Failed to parse SID on record for %s in %s", 
+                                            domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
                talloc_free(result);
                talloc_free(ldb);
                return NULL;
@@ -194,3 +125,28 @@ struct dom_sid *secrets_get_domain_sid(TALLOC_CTX *mem_ctx,
 
        return result;
 }
+
+char *keytab_name_from_msg(TALLOC_CTX *mem_ctx, struct ldb_context *ldb, struct ldb_message *msg) 
+{
+       const char *krb5keytab = ldb_msg_find_attr_as_string(msg, "krb5Keytab", NULL);
+       if (krb5keytab) {
+               return talloc_strdup(mem_ctx, krb5keytab);
+       } else {
+               char *file_keytab;
+               char *relative_path;
+               const char *privateKeytab = ldb_msg_find_attr_as_string(msg, "privateKeytab", NULL);
+               if (!privateKeytab) {
+                       return NULL;
+               }
+
+               relative_path = ldb_relative_path(ldb, mem_ctx, privateKeytab);
+               if (!relative_path) {
+                       return NULL;
+               }
+               file_keytab = talloc_asprintf(mem_ctx, "FILE:%s", relative_path);
+               talloc_free(relative_path);
+               return file_keytab;
+       }
+       return NULL;
+}
+