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Diffstat (limited to 'src/sss_client/nss_passwd.c')
-rw-r--r--src/sss_client/nss_passwd.c378
1 files changed, 378 insertions, 0 deletions
diff --git a/src/sss_client/nss_passwd.c b/src/sss_client/nss_passwd.c
new file mode 100644
index 00000000..95c7de61
--- /dev/null
+++ b/src/sss_client/nss_passwd.c
@@ -0,0 +1,378 @@
+/*
+ * System Security Services Daemon. NSS client interface
+ *
+ * Copyright (C) Simo Sorce 2007
+ *
+ * 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 */
+
+#include <nss.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include "sss_cli.h"
+
+static struct sss_nss_getpwent_data {
+ size_t len;
+ size_t ptr;
+ uint8_t *data;
+} sss_nss_getpwent_data;
+
+static void sss_nss_getpwent_data_clean(void) {
+
+ if (sss_nss_getpwent_data.data != NULL) {
+ free(sss_nss_getpwent_data.data);
+ sss_nss_getpwent_data.data = NULL;
+ }
+ sss_nss_getpwent_data.len = 0;
+ sss_nss_getpwent_data.ptr = 0;
+}
+
+/* GETPWNAM Request:
+ *
+ * 0-X: string with name
+ *
+ * GERTPWUID Request:
+ *
+ * 0-3: 32bit number with uid
+ *
+ * Replies:
+ *
+ * 0-3: 32bit unsigned number of results
+ * 4-7: 32bit unsigned (reserved/padding)
+ * For each result:
+ * 0-3: 32bit number uid
+ * 4-7: 32bit number gid
+ * 8-X: sequence of 5, 0 terminated, strings (name, passwd, gecos, dir, shell)
+ */
+
+struct sss_nss_pw_rep {
+ struct passwd *result;
+ char *buffer;
+ size_t buflen;
+};
+
+static int sss_nss_getpw_readrep(struct sss_nss_pw_rep *pr,
+ uint8_t *buf, size_t *len)
+{
+ size_t i, slen, dlen;
+ char *sbuf;
+ uint32_t c;
+
+ if (*len < 13) { /* not enough space for data, bad packet */
+ return EBADMSG;
+ }
+
+ SAFEALIGN_COPY_UINT32(&c, buf, NULL);
+ pr->result->pw_uid = c;
+ SAFEALIGN_COPY_UINT32(&c, buf+sizeof(uint32_t), NULL);
+ pr->result->pw_gid = c;
+
+ sbuf = (char *)&buf[8];
+ slen = *len - 8;
+ dlen = pr->buflen;
+
+ i = 0;
+ pr->result->pw_name = &(pr->buffer[i]);
+ while (slen > i && dlen > 0) {
+ pr->buffer[i] = sbuf[i];
+ if (pr->buffer[i] == '\0') break;
+ i++;
+ dlen--;
+ }
+ if (slen <= i) { /* premature end of buf */
+ return EBADMSG;
+ }
+ if (dlen <= 0) { /* not enough memory */
+ return ERANGE; /* not ENOMEM, ERANGE is what glibc looks for */
+ }
+ i++;
+ dlen--;
+
+ pr->result->pw_passwd = &(pr->buffer[i]);
+ while (slen > i && dlen > 0) {
+ pr->buffer[i] = sbuf[i];
+ if (pr->buffer[i] == '\0') break;
+ i++;
+ dlen--;
+ }
+ if (slen <= i) { /* premature end of buf */
+ return EBADMSG;
+ }
+ if (dlen <= 0) { /* not enough memory */
+ return ERANGE; /* not ENOMEM, ERANGE is what glibc looks for */
+ }
+ i++;
+ dlen--;
+
+ pr->result->pw_gecos = &(pr->buffer[i]);
+ while (slen > i && dlen > 0) {
+ pr->buffer[i] = sbuf[i];
+ if (pr->buffer[i] == '\0') break;
+ i++;
+ dlen--;
+ }
+ if (slen <= i) { /* premature end of buf */
+ return EBADMSG;
+ }
+ if (dlen <= 0) { /* not enough memory */
+ return ERANGE; /* not ENOMEM, ERANGE is what glibc looks for */
+ }
+ i++;
+ dlen--;
+
+ pr->result->pw_dir = &(pr->buffer[i]);
+ while (slen > i && dlen > 0) {
+ pr->buffer[i] = sbuf[i];
+ if (pr->buffer[i] == '\0') break;
+ i++;
+ dlen--;
+ }
+ if (slen <= i) { /* premature end of buf */
+ return EBADMSG;
+ }
+ if (dlen <= 0) { /* not enough memory */
+ return ERANGE; /* not ENOMEM, ERANGE is what glibc looks for */
+ }
+ i++;
+ dlen--;
+
+ pr->result->pw_shell = &(pr->buffer[i]);
+ while (slen > i && dlen > 0) {
+ pr->buffer[i] = sbuf[i];
+ if (pr->buffer[i] == '\0') break;
+ i++;
+ dlen--;
+ }
+ if (slen <= i) { /* premature end of buf */
+ return EBADMSG;
+ }
+ if (dlen <= 0) { /* not enough memory */
+ return ERANGE; /* not ENOMEM, ERANGE is what glibc looks for */
+ }
+
+ *len = slen -i -1;
+
+ return 0;
+}
+
+enum nss_status _nss_sss_getpwnam_r(const char *name, struct passwd *result,
+ char *buffer, size_t buflen, int *errnop)
+{
+ struct sss_cli_req_data rd;
+ struct sss_nss_pw_rep pwrep;
+ uint8_t *repbuf;
+ size_t replen, len;
+ enum nss_status nret;
+ int ret;
+
+ /* Caught once glibc passing in buffer == 0x0 */
+ if (!buffer || !buflen) return ERANGE;
+
+ rd.len = strlen(name) + 1;
+ rd.data = name;
+
+ nret = sss_nss_make_request(SSS_NSS_GETPWNAM, &rd,
+ &repbuf, &replen, errnop);
+ if (nret != NSS_STATUS_SUCCESS) {
+ return nret;
+ }
+
+ pwrep.result = result;
+ pwrep.buffer = buffer;
+ pwrep.buflen = buflen;
+
+ /* no results if not found */
+ if (((uint32_t *)repbuf)[0] == 0) {
+ free(repbuf);
+ return NSS_STATUS_NOTFOUND;
+ }
+
+ /* only 1 result is accepted for this function */
+ if (((uint32_t *)repbuf)[0] != 1) {
+ *errnop = EBADMSG;
+ free(repbuf);
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ len = replen - 8;
+ ret = sss_nss_getpw_readrep(&pwrep, repbuf+8, &len);
+ free(repbuf);
+ if (ret) {
+ *errnop = ret;
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status _nss_sss_getpwuid_r(uid_t uid, struct passwd *result,
+ char *buffer, size_t buflen, int *errnop)
+{
+ struct sss_cli_req_data rd;
+ struct sss_nss_pw_rep pwrep;
+ uint8_t *repbuf;
+ size_t replen, len;
+ enum nss_status nret;
+ uint32_t user_uid;
+ int ret;
+
+ /* Caught once glibc passing in buffer == 0x0 */
+ if (!buffer || !buflen) return ERANGE;
+
+ user_uid = uid;
+ rd.len = sizeof(uint32_t);
+ rd.data = &user_uid;
+
+ nret = sss_nss_make_request(SSS_NSS_GETPWUID, &rd,
+ &repbuf, &replen, errnop);
+ if (nret != NSS_STATUS_SUCCESS) {
+ return nret;
+ }
+
+ pwrep.result = result;
+ pwrep.buffer = buffer;
+ pwrep.buflen = buflen;
+
+ /* no results if not found */
+ if (((uint32_t *)repbuf)[0] == 0) {
+ free(repbuf);
+ return NSS_STATUS_NOTFOUND;
+ }
+
+ /* only 1 result is accepted for this function */
+ if (((uint32_t *)repbuf)[0] != 1) {
+ *errnop = EBADMSG;
+ free(repbuf);
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ len = replen - 8;
+ ret = sss_nss_getpw_readrep(&pwrep, repbuf+8, &len);
+ free(repbuf);
+ if (ret) {
+ *errnop = ret;
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status _nss_sss_setpwent(void)
+{
+ enum nss_status nret;
+ int errnop;
+
+ /* make sure we do not have leftovers, and release memory */
+ sss_nss_getpwent_data_clean();
+
+ nret = sss_nss_make_request(SSS_NSS_SETPWENT,
+ NULL, NULL, NULL, &errnop);
+ if (nret != NSS_STATUS_SUCCESS) {
+ errno = errnop;
+ return nret;
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status _nss_sss_getpwent_r(struct passwd *result,
+ char *buffer, size_t buflen,
+ int *errnop)
+{
+ struct sss_cli_req_data rd;
+ struct sss_nss_pw_rep pwrep;
+ uint8_t *repbuf;
+ size_t replen;
+ enum nss_status nret;
+ uint32_t num_entries;
+ int ret;
+
+ /* Caught once glibc passing in buffer == 0x0 */
+ if (!buffer || !buflen) return ERANGE;
+
+ /* if there are leftovers return the next one */
+ if (sss_nss_getpwent_data.data != NULL &&
+ sss_nss_getpwent_data.ptr < sss_nss_getpwent_data.len) {
+
+ repbuf = sss_nss_getpwent_data.data + sss_nss_getpwent_data.ptr;
+ replen = sss_nss_getpwent_data.len - sss_nss_getpwent_data.ptr;
+
+ pwrep.result = result;
+ pwrep.buffer = buffer;
+ pwrep.buflen = buflen;
+
+ ret = sss_nss_getpw_readrep(&pwrep, repbuf, &replen);
+ if (ret) {
+ *errnop = ret;
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ /* advance buffer pointer */
+ sss_nss_getpwent_data.ptr = sss_nss_getpwent_data.len - replen;
+
+ return NSS_STATUS_SUCCESS;
+ }
+
+ /* release memory if any */
+ sss_nss_getpwent_data_clean();
+
+ /* retrieve no more than SSS_NSS_MAX_ENTRIES at a time */
+ num_entries = SSS_NSS_MAX_ENTRIES;
+ rd.len = sizeof(uint32_t);
+ rd.data = &num_entries;
+
+ nret = sss_nss_make_request(SSS_NSS_GETPWENT, &rd,
+ &repbuf, &replen, errnop);
+ if (nret != NSS_STATUS_SUCCESS) {
+ return nret;
+ }
+
+ /* no results if not found */
+ if ((((uint32_t *)repbuf)[0] == 0) || (replen - 8 == 0)) {
+ free(repbuf);
+ return NSS_STATUS_NOTFOUND;
+ }
+
+ sss_nss_getpwent_data.data = repbuf;
+ sss_nss_getpwent_data.len = replen;
+ sss_nss_getpwent_data.ptr = 8; /* skip metadata fields */
+
+ /* call again ourselves, this will return the first result */
+ return _nss_sss_getpwent_r(result, buffer, buflen, errnop);
+}
+
+enum nss_status _nss_sss_endpwent(void)
+{
+ enum nss_status nret;
+ int errnop;
+
+ /* make sure we do not have leftovers, and release memory */
+ sss_nss_getpwent_data_clean();
+
+ nret = sss_nss_make_request(SSS_NSS_ENDPWENT,
+ NULL, NULL, NULL, &errnop);
+ if (nret != NSS_STATUS_SUCCESS) {
+ errno = errnop;
+ return nret;
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
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