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authorSimo Sorce <simo@redhat.com>2012-01-02 17:10:12 -0500
committerStephen Gallagher <sgallagh@redhat.com>2012-03-19 09:45:25 -0400
commit1171986bdc3011555c5b62a9d9ee9f7481f48cdc (patch)
treef60dace9d32638ae65c9b53e2576a18b4393521e /src/sss_client
parent5f216c753dbd2f2b25a011c5f705ee4f8ad924e6 (diff)
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sss_client: shared memory cache passwd map support
Diffstat (limited to 'src/sss_client')
-rw-r--r--src/sss_client/nss_mc.h8
-rw-r--r--src/sss_client/nss_mc_passwd.c217
-rw-r--r--src/sss_client/nss_passwd.c37
3 files changed, 262 insertions, 0 deletions
diff --git a/src/sss_client/nss_mc.h b/src/sss_client/nss_mc.h
index 35cefe5..b1b929e 100644
--- a/src/sss_client/nss_mc.h
+++ b/src/sss_client/nss_mc.h
@@ -59,4 +59,12 @@ errno_t sss_nss_mc_get_record(struct sss_cli_mc_ctx *ctx,
errno_t sss_nss_str_ptr_from_buffer(char **str, void **cookie,
char *buf, size_t len);
+/* passwd db */
+errno_t sss_nss_mc_getpwnam(const char *name, size_t name_len,
+ struct passwd *result,
+ char *buffer, size_t buflen);
+errno_t sss_nss_mc_getpwuid(uid_t uid,
+ struct passwd *result,
+ char *buffer, size_t buflen);
+
#endif /* _NSS_MC_H_ */
diff --git a/src/sss_client/nss_mc_passwd.c b/src/sss_client/nss_mc_passwd.c
new file mode 100644
index 0000000..ca9945e
--- /dev/null
+++ b/src/sss_client/nss_mc_passwd.c
@@ -0,0 +1,217 @@
+/*
+ * 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* PASSWD database NSS interface using mmap cache */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <time.h>
+#include "nss_mc.h"
+
+struct sss_cli_mc_ctx pw_mc_ctx = { false, -1, 0, NULL, 0, NULL, 0, NULL, 0 };
+
+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;
+
+ ret = sss_nss_mc_get_ctx("passwd", &pw_mc_ctx);
+ if (ret) {
+ return ret;
+ }
+
+ /* 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 > MC_SIZE_TO_SLOTS(pw_mc_ctx.dt_size)) {
+ return ENOENT;
+ }
+
+ while (slot != MC_INVALID_VAL) {
+
+ 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 = rec->next;
+ continue;
+ }
+
+ data = (struct sss_mc_pwd_data *)rec->data;
+ rec_name = (char *)data + data->name;
+ if (strcmp(name, rec_name) == 0) {
+ break;
+ }
+
+ slot = rec->next;
+ }
+
+ if (slot == MC_INVALID_VAL) {
+ ret = ENOENT;
+ goto done;
+ }
+
+ ret = sss_nss_mc_parse_result(rec, result, buffer, buflen);
+
+done:
+ free(rec);
+ 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) {
+ return EINVAL;
+ }
+
+ /* 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 > MC_SIZE_TO_SLOTS(pw_mc_ctx.dt_size)) {
+ return ENOENT;
+ }
+
+ while (slot != MC_INVALID_VAL) {
+
+ 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 = rec->next;
+ continue;
+ }
+
+ data = (struct sss_mc_pwd_data *)rec->data;
+ if (uid == data->uid) {
+ break;
+ }
+
+ slot = rec->next;
+ }
+
+ if (slot == MC_INVALID_VAL) {
+ ret = ENOENT;
+ goto done;
+ }
+
+ ret = sss_nss_mc_parse_result(rec, result, buffer, buflen);
+
+done:
+ free(rec);
+ return ret;
+}
+
diff --git a/src/sss_client/nss_passwd.c b/src/sss_client/nss_passwd.c
index 1612494..e2f488b 100644
--- a/src/sss_client/nss_passwd.c
+++ b/src/sss_client/nss_passwd.c
@@ -28,6 +28,7 @@
#include <stdint.h>
#include <string.h>
#include "sss_cli.h"
+#include "nss_mc.h"
static struct sss_nss_getpwent_data {
size_t len;
@@ -154,6 +155,24 @@ enum nss_status _nss_sss_getpwnam_r(const char *name, struct passwd *result,
return NSS_STATUS_NOTFOUND;
}
+ ret = sss_nss_mc_getpwnam(name, name_len, result, buffer, buflen);
+ switch (ret) {
+ case 0:
+ *errnop = 0;
+ return NSS_STATUS_SUCCESS;
+ case ERANGE:
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ case ENOENT:
+ /* fall through, we need to actively ask the parent
+ * if no entry is found */
+ break;
+ default:
+ /* if using the mmaped cache failed,
+ * fall back to socket based comms */
+ break;
+ }
+
rd.len = name_len + 1;
rd.data = name;
@@ -214,6 +233,24 @@ enum nss_status _nss_sss_getpwuid_r(uid_t uid, struct passwd *result,
/* Caught once glibc passing in buffer == 0x0 */
if (!buffer || !buflen) return ERANGE;
+ ret = sss_nss_mc_getpwuid(uid, result, buffer, buflen);
+ switch (ret) {
+ case 0:
+ *errnop = 0;
+ return NSS_STATUS_SUCCESS;
+ case ERANGE:
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ case ENOENT:
+ /* fall through, we need to actively ask the parent
+ * if no entry is found */
+ break;
+ default:
+ /* if using the mmaped cache failed,
+ * fall back to socket based comms */
+ break;
+ }
+
user_uid = uid;
rd.len = sizeof(uint32_t);
rd.data = &user_uid;