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-rw-r--r--src/sss_client/nss_mc_passwd.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/src/sss_client/nss_mc_passwd.c b/src/sss_client/nss_mc_passwd.c
new file mode 100644
index 0000000..256d484
--- /dev/null
+++ b/src/sss_client/nss_mc_passwd.c
@@ -0,0 +1,247 @@
+/*
+ * System Security Services Daemon. NSS client interface
+ *
+ * Copyright (C) Simo Sorce 2011
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* PASSWD database NSS interface using mmap cache */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <sys/mman.h>
+#include <time.h>
+#include "nss_mc.h"
+
+#if HAVE_PTHREAD
+static pthread_mutex_t pw_mc_ctx_mutex = PTHREAD_MUTEX_INITIALIZER;
+static struct sss_cli_mc_ctx pw_mc_ctx = SSS_CLI_MC_CTX_INITIALIZER(&pw_mc_ctx_mutex);
+#else
+static struct sss_cli_mc_ctx pw_mc_ctx = SSS_CLI_MC_CTX_INITIALIZER;
+#endif
+
+static errno_t sss_nss_mc_parse_result(struct sss_mc_rec *rec,
+ struct passwd *result,
+ char *buffer, size_t buflen)
+{
+ struct sss_mc_pwd_data *data;
+ time_t expire;
+ void *cookie;
+ int ret;
+
+ /* additional checks before filling result*/
+ expire = rec->expire;
+ if (expire < time(NULL)) {
+ /* entry is now invalid */
+ return EINVAL;
+ }
+
+ data = (struct sss_mc_pwd_data *)rec->data;
+
+ if (data->strs_len > buflen) {
+ return ERANGE;
+ }
+
+ /* fill in glibc provided structs */
+
+ /* copy in buffer */
+ memcpy(buffer, data->strs, data->strs_len);
+
+ /* fill in passwd */
+ result->pw_uid = data->uid;
+ result->pw_gid = data->gid;
+
+ cookie = NULL;
+ ret = sss_nss_str_ptr_from_buffer(&result->pw_name, &cookie,
+ buffer, data->strs_len);
+ if (ret) {
+ return ret;
+ }
+ ret = sss_nss_str_ptr_from_buffer(&result->pw_passwd, &cookie,
+ buffer, data->strs_len);
+ if (ret) {
+ return ret;
+ }
+ ret = sss_nss_str_ptr_from_buffer(&result->pw_gecos, &cookie,
+ buffer, data->strs_len);
+ if (ret) {
+ return ret;
+ }
+ ret = sss_nss_str_ptr_from_buffer(&result->pw_dir, &cookie,
+ buffer, data->strs_len);
+ if (ret) {
+ return ret;
+ }
+ ret = sss_nss_str_ptr_from_buffer(&result->pw_shell, &cookie,
+ buffer, data->strs_len);
+ if (ret) {
+ return ret;
+ }
+ if (cookie != NULL) {
+ return EINVAL;
+ }
+
+ return 0;
+}
+
+errno_t sss_nss_mc_getpwnam(const char *name, size_t name_len,
+ struct passwd *result,
+ char *buffer, size_t buflen)
+{
+ struct sss_mc_rec *rec = NULL;
+ struct sss_mc_pwd_data *data;
+ char *rec_name;
+ uint32_t hash;
+ uint32_t slot;
+ int ret;
+ const size_t strs_offset = offsetof(struct sss_mc_pwd_data, strs);
+ size_t data_size;
+
+ ret = sss_nss_mc_get_ctx("passwd", &pw_mc_ctx);
+ if (ret) {
+ return ret;
+ }
+
+ /* Get max size of data table. */
+ data_size = pw_mc_ctx.dt_size;
+
+ /* hashes are calculated including the NULL terminator */
+ hash = sss_nss_mc_hash(&pw_mc_ctx, name, name_len + 1);
+ slot = pw_mc_ctx.hash_table[hash];
+
+ /* If slot is not within the bounds of mmapped region and
+ * it's value is not MC_INVALID_VAL, then the cache is
+ * probably corrupted. */
+ while (MC_SLOT_WITHIN_BOUNDS(slot, data_size)) {
+ /* free record from previous iteration */
+ free(rec);
+ rec = NULL;
+
+ ret = sss_nss_mc_get_record(&pw_mc_ctx, slot, &rec);
+ if (ret) {
+ goto done;
+ }
+
+ /* check record matches what we are searching for */
+ if (hash != rec->hash1) {
+ /* if name hash does not match we can skip this immediately */
+ slot = sss_nss_mc_next_slot_with_hash(rec, hash);
+ continue;
+ }
+
+ data = (struct sss_mc_pwd_data *)rec->data;
+ rec_name = (char *)data + data->name;
+ /* Integrity check
+ * - data->name cannot point outside strings
+ * - all strings must be within copy of record
+ * - rec_name is a zero-terminated string */
+ if (data->name < strs_offset
+ || data->name >= strs_offset + data->strs_len
+ || data->strs_len > rec->len) {
+ ret = ENOENT;
+ goto done;
+ }
+
+ if (strcmp(name, rec_name) == 0) {
+ break;
+ }
+
+ slot = sss_nss_mc_next_slot_with_hash(rec, hash);
+ }
+
+ if (!MC_SLOT_WITHIN_BOUNDS(slot, data_size)) {
+ ret = ENOENT;
+ goto done;
+ }
+
+ ret = sss_nss_mc_parse_result(rec, result, buffer, buflen);
+
+done:
+ free(rec);
+ __sync_sub_and_fetch(&pw_mc_ctx.active_threads, 1);
+ return ret;
+}
+
+errno_t sss_nss_mc_getpwuid(uid_t uid,
+ struct passwd *result,
+ char *buffer, size_t buflen)
+{
+ struct sss_mc_rec *rec = NULL;
+ struct sss_mc_pwd_data *data;
+ char uidstr[11];
+ uint32_t hash;
+ uint32_t slot;
+ int len;
+ int ret;
+
+ ret = sss_nss_mc_get_ctx("passwd", &pw_mc_ctx);
+ if (ret) {
+ return ret;
+ }
+
+ len = snprintf(uidstr, 11, "%ld", (long)uid);
+ if (len > 10) {
+ ret = EINVAL;
+ goto done;
+ }
+
+ /* hashes are calculated including the NULL terminator */
+ hash = sss_nss_mc_hash(&pw_mc_ctx, uidstr, len+1);
+ slot = pw_mc_ctx.hash_table[hash];
+
+ /* If slot is not within the bounds of mmapped region and
+ * it's value is not MC_INVALID_VAL, then the cache is
+ * probably corrupted. */
+ while (MC_SLOT_WITHIN_BOUNDS(slot, pw_mc_ctx.dt_size)) {
+ /* free record from previous iteration */
+ free(rec);
+ rec = NULL;
+
+ ret = sss_nss_mc_get_record(&pw_mc_ctx, slot, &rec);
+ if (ret) {
+ goto done;
+ }
+
+ /* check record matches what we are searching for */
+ if (hash != rec->hash2) {
+ /* if uid hash does not match we can skip this immediately */
+ slot = sss_nss_mc_next_slot_with_hash(rec, hash);
+ continue;
+ }
+
+ data = (struct sss_mc_pwd_data *)rec->data;
+ if (uid == data->uid) {
+ break;
+ }
+
+ slot = sss_nss_mc_next_slot_with_hash(rec, hash);
+ }
+
+ if (!MC_SLOT_WITHIN_BOUNDS(slot, pw_mc_ctx.dt_size)) {
+ ret = ENOENT;
+ goto done;
+ }
+
+ ret = sss_nss_mc_parse_result(rec, result, buffer, buflen);
+
+done:
+ free(rec);
+ __sync_sub_and_fetch(&pw_mc_ctx.active_threads, 1);
+ return ret;
+}
+
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