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-rw-r--r--source3/lib/idmap_cache.c442
1 files changed, 442 insertions, 0 deletions
diff --git a/source3/lib/idmap_cache.c b/source3/lib/idmap_cache.c
new file mode 100644
index 0000000..a4b8861
--- /dev/null
+++ b/source3/lib/idmap_cache.c
@@ -0,0 +1,442 @@
+/*
+ Unix SMB/CIFS implementation.
+ ID Mapping Cache
+
+ Copyright (C) Volker Lendecke 2008
+
+ 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 "includes.h"
+#include "idmap_cache.h"
+#include "../libcli/security/security.h"
+#include "../librpc/gen_ndr/idmap.h"
+#include "lib/gencache.h"
+#include "lib/util/string_wrappers.h"
+
+/**
+ * Find a sid2xid mapping
+ * @param[in] sid the sid to map
+ * @param[out] id where to put the result
+ * @param[out] expired is the cache entry expired?
+ * @retval Was anything in the cache at all?
+ *
+ * If id->id == -1 this was a negative mapping.
+ */
+
+bool idmap_cache_find_sid2unixid(const struct dom_sid *sid, struct unixid *id,
+ bool *expired)
+{
+ struct dom_sid_buf sidstr;
+ char *key;
+ char *value = NULL;
+ char *endptr;
+ time_t timeout;
+ bool ret;
+ struct unixid tmp_id;
+
+ key = talloc_asprintf(talloc_tos(), "IDMAP/SID2XID/%s",
+ dom_sid_str_buf(sid, &sidstr));
+ if (key == NULL) {
+ return false;
+ }
+ ret = gencache_get(key, talloc_tos(), &value, &timeout);
+ if (!ret) {
+ goto done;
+ }
+
+ DEBUG(10, ("Parsing value for key [%s]: value=[%s]\n", key, value));
+
+ if (value[0] == '\0') {
+ DEBUG(0, ("Failed to parse value for key [%s]: "
+ "value is empty\n", key));
+ ret = false;
+ goto done;
+ }
+
+ tmp_id.id = strtol(value, &endptr, 10);
+
+ if ((value == endptr) && (tmp_id.id == 0)) {
+ DEBUG(0, ("Failed to parse value for key [%s]: value[%s] does "
+ "not start with a number\n", key, value));
+ ret = false;
+ goto done;
+ }
+
+ DEBUG(10, ("Parsing value for key [%s]: id=[%llu], endptr=[%s]\n",
+ key, (unsigned long long)tmp_id.id, endptr));
+
+ ret = (*endptr == ':');
+ if (ret) {
+ switch (endptr[1]) {
+ case 'U':
+ tmp_id.type = ID_TYPE_UID;
+ break;
+
+ case 'G':
+ tmp_id.type = ID_TYPE_GID;
+ break;
+
+ case 'B':
+ tmp_id.type = ID_TYPE_BOTH;
+ break;
+
+ case 'N':
+ tmp_id.type = ID_TYPE_NOT_SPECIFIED;
+ break;
+
+ case '\0':
+ DEBUG(0, ("FAILED to parse value for key [%s] "
+ "(id=[%llu], endptr=[%s]): "
+ "no type character after colon\n",
+ key, (unsigned long long)tmp_id.id, endptr));
+ ret = false;
+ goto done;
+ default:
+ DEBUG(0, ("FAILED to parse value for key [%s] "
+ "(id=[%llu], endptr=[%s]): "
+ "illegal type character '%c'\n",
+ key, (unsigned long long)tmp_id.id, endptr,
+ endptr[1]));
+ ret = false;
+ goto done;
+ }
+ if (endptr[2] != '\0') {
+ DEBUG(0, ("FAILED to parse value for key [%s] "
+ "(id=[%llu], endptr=[%s]): "
+ "more than 1 type character after colon\n",
+ key, (unsigned long long)tmp_id.id, endptr));
+ ret = false;
+ goto done;
+ }
+
+ *id = tmp_id;
+ *expired = (timeout <= time(NULL));
+ } else {
+ DEBUG(0, ("FAILED to parse value for key [%s] (value=[%s]): "
+ "colon missing after id=[%llu]\n",
+ key, value, (unsigned long long)tmp_id.id));
+ }
+
+done:
+ TALLOC_FREE(key);
+ TALLOC_FREE(value);
+ return ret;
+}
+
+/**
+ * Find a sid2uid mapping
+ * @param[in] sid the sid to map
+ * @param[out] puid where to put the result
+ * @param[out] expired is the cache entry expired?
+ * @retval Was anything in the cache at all?
+ *
+ * If *puid == -1 this was a negative mapping.
+ */
+
+bool idmap_cache_find_sid2uid(const struct dom_sid *sid, uid_t *puid,
+ bool *expired)
+{
+ bool ret;
+ struct unixid id;
+ ret = idmap_cache_find_sid2unixid(sid, &id, expired);
+ if (!ret) {
+ return false;
+ }
+
+ if (id.type == ID_TYPE_BOTH || id.type == ID_TYPE_UID) {
+ *puid = id.id;
+ } else {
+ *puid = -1;
+ }
+ return true;
+}
+
+/**
+ * Find a sid2gid mapping
+ * @param[in] sid the sid to map
+ * @param[out] pgid where to put the result
+ * @param[out] expired is the cache entry expired?
+ * @retval Was anything in the cache at all?
+ *
+ * If *pgid == -1 this was a negative mapping.
+ */
+
+bool idmap_cache_find_sid2gid(const struct dom_sid *sid, gid_t *pgid,
+ bool *expired)
+{
+ bool ret;
+ struct unixid id;
+ ret = idmap_cache_find_sid2unixid(sid, &id, expired);
+ if (!ret) {
+ return false;
+ }
+
+ if (id.type == ID_TYPE_BOTH || id.type == ID_TYPE_GID) {
+ *pgid = id.id;
+ } else {
+ *pgid = -1;
+ }
+ return true;
+}
+
+struct idmap_cache_xid2sid_state {
+ struct dom_sid *sid;
+ bool *expired;
+ bool ret;
+};
+
+static void idmap_cache_xid2sid_parser(const struct gencache_timeout *timeout,
+ DATA_BLOB blob,
+ void *private_data)
+{
+ struct idmap_cache_xid2sid_state *state =
+ (struct idmap_cache_xid2sid_state *)private_data;
+ char *value;
+
+ if ((blob.length == 0) || (blob.data[blob.length-1] != 0)) {
+ /*
+ * Not a string, can't be a valid mapping
+ */
+ state->ret = false;
+ return;
+ }
+
+ value = (char *)blob.data;
+
+ if ((value[0] == '-') && (value[1] == '\0')) {
+ /*
+ * Return NULL SID, see comment to uid2sid
+ */
+ *state->sid = (struct dom_sid) {0};
+ state->ret = true;
+ } else {
+ state->ret = string_to_sid(state->sid, value);
+ }
+ if (state->ret) {
+ *state->expired = gencache_timeout_expired(timeout);
+ }
+}
+
+/**
+ * Find a xid2sid mapping
+ * @param[in] id the unix id to map
+ * @param[out] sid where to put the result
+ * @param[out] expired is the cache entry expired?
+ * @retval Was anything in the cache at all?
+ *
+ * If "is_null_sid(sid)", this was a negative mapping.
+ */
+bool idmap_cache_find_xid2sid(
+ const struct unixid *id, struct dom_sid *sid, bool *expired)
+{
+ struct idmap_cache_xid2sid_state state = {
+ .sid = sid, .expired = expired
+ };
+ fstring key;
+ char c;
+
+ switch (id->type) {
+ case ID_TYPE_UID:
+ c = 'U';
+ break;
+ case ID_TYPE_GID:
+ c = 'G';
+ break;
+ default:
+ return false;
+ }
+
+ fstr_sprintf(key, "IDMAP/%cID2SID/%d", c, (int)id->id);
+
+ gencache_parse(key, idmap_cache_xid2sid_parser, &state);
+ return state.ret;
+}
+
+
+/**
+ * Store a mapping in the idmap cache
+ * @param[in] sid the sid to map
+ * @param[in] unix_id the unix_id to map
+ *
+ * If both parameters are valid values, then a positive mapping in both
+ * directions is stored. If "is_null_sid(sid)" is true, then this will be a
+ * negative mapping of xid, we want to cache that for this xid we could not
+ * find anything. Likewise if "xid==-1", then we want to cache that we did not
+ * find a mapping for the sid passed here.
+ */
+
+void idmap_cache_set_sid2unixid(const struct dom_sid *sid, struct unixid *unix_id)
+{
+ time_t now = time(NULL);
+ time_t timeout;
+ fstring key, value;
+
+ if (!is_null_sid(sid)) {
+ struct dom_sid_buf sidstr;
+ fstr_sprintf(key, "IDMAP/SID2XID/%s",
+ dom_sid_str_buf(sid, &sidstr));
+ switch (unix_id->type) {
+ case ID_TYPE_UID:
+ fstr_sprintf(value, "%d:U", (int)unix_id->id);
+ break;
+ case ID_TYPE_GID:
+ fstr_sprintf(value, "%d:G", (int)unix_id->id);
+ break;
+ case ID_TYPE_BOTH:
+ fstr_sprintf(value, "%d:B", (int)unix_id->id);
+ break;
+ case ID_TYPE_NOT_SPECIFIED:
+ fstr_sprintf(value, "%d:N", (int)unix_id->id);
+ break;
+ default:
+ return;
+ }
+ timeout = (unix_id->id == -1)
+ ? lp_idmap_negative_cache_time()
+ : lp_idmap_cache_time();
+ gencache_set(key, value, now + timeout);
+ }
+ if (unix_id->id != -1) {
+ if (is_null_sid(sid)) {
+ /* negative xid mapping */
+ fstrcpy(value, "-");
+ timeout = lp_idmap_negative_cache_time();
+ }
+ else {
+ sid_to_fstring(value, sid);
+ timeout = lp_idmap_cache_time();
+ }
+ switch (unix_id->type) {
+ case ID_TYPE_BOTH:
+ fstr_sprintf(key, "IDMAP/UID2SID/%d", (int)unix_id->id);
+ gencache_set(key, value, now + timeout);
+ fstr_sprintf(key, "IDMAP/GID2SID/%d", (int)unix_id->id);
+ gencache_set(key, value, now + timeout);
+ return;
+
+ case ID_TYPE_UID:
+ fstr_sprintf(key, "IDMAP/UID2SID/%d", (int)unix_id->id);
+ break;
+
+ case ID_TYPE_GID:
+ fstr_sprintf(key, "IDMAP/GID2SID/%d", (int)unix_id->id);
+ break;
+
+ default:
+ return;
+ }
+ gencache_set(key, value, now + timeout);
+ }
+}
+
+static char* key_xid2sid_str(TALLOC_CTX* mem_ctx, char t, const char* id) {
+ return talloc_asprintf(mem_ctx, "IDMAP/%cID2SID/%s", t, id);
+}
+
+static char* key_xid2sid(TALLOC_CTX* mem_ctx, char t, int id) {
+ char str[32];
+ snprintf(str, sizeof(str), "%d", id);
+ return key_xid2sid_str(mem_ctx, t, str);
+}
+
+static char* key_sid2xid_str(TALLOC_CTX* mem_ctx, const char* id) {
+ return talloc_asprintf(mem_ctx, "IDMAP/SID2XID/%s", id);
+}
+
+static bool idmap_cache_del_xid(char t, int xid)
+{
+ TALLOC_CTX* mem_ctx = talloc_stackframe();
+ const char* key = key_xid2sid(mem_ctx, t, xid);
+ char* sid_str = NULL;
+ time_t timeout;
+ bool ret = true;
+
+ if (!gencache_get(key, mem_ctx, &sid_str, &timeout)) {
+ DEBUG(3, ("no entry: %s\n", key));
+ ret = false;
+ goto done;
+ }
+
+ if (sid_str[0] != '-') {
+ const char* sid_key = key_sid2xid_str(mem_ctx, sid_str);
+ if (!gencache_del(sid_key)) {
+ DEBUG(2, ("failed to delete: %s\n", sid_key));
+ ret = false;
+ } else {
+ DEBUG(5, ("delete: %s\n", sid_key));
+ }
+
+ }
+
+ if (!gencache_del(key)) {
+ DEBUG(1, ("failed to delete: %s\n", key));
+ ret = false;
+ } else {
+ DEBUG(5, ("delete: %s\n", key));
+ }
+
+done:
+ talloc_free(mem_ctx);
+ return ret;
+}
+
+bool idmap_cache_del_uid(uid_t uid) {
+ return idmap_cache_del_xid('U', uid);
+}
+
+bool idmap_cache_del_gid(gid_t gid) {
+ return idmap_cache_del_xid('G', gid);
+}
+
+bool idmap_cache_del_sid(const struct dom_sid *sid)
+{
+ TALLOC_CTX* mem_ctx = talloc_stackframe();
+ bool ret = true;
+ bool expired;
+ struct unixid id;
+ struct dom_sid_buf sidbuf;
+ const char *sid_key;
+
+ if (!idmap_cache_find_sid2unixid(sid, &id, &expired)) {
+ ret = false;
+ goto done;
+ }
+
+ if (id.id != -1) {
+ switch (id.type) {
+ case ID_TYPE_BOTH:
+ idmap_cache_del_xid('U', id.id);
+ idmap_cache_del_xid('G', id.id);
+ break;
+ case ID_TYPE_UID:
+ idmap_cache_del_xid('U', id.id);
+ break;
+ case ID_TYPE_GID:
+ idmap_cache_del_xid('G', id.id);
+ break;
+ default:
+ break;
+ }
+ }
+
+ sid_key = key_sid2xid_str(mem_ctx, dom_sid_str_buf(sid, &sidbuf));
+ if (sid_key == NULL) {
+ return false;
+ }
+ /* If the mapping was symmetric, then this should fail */
+ gencache_del(sid_key);
+done:
+ talloc_free(mem_ctx);
+ return ret;
+}
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