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-rw-r--r--src/lib/cifs_idmap_sss/cifs_idmap_sss.c340
1 files changed, 340 insertions, 0 deletions
diff --git a/src/lib/cifs_idmap_sss/cifs_idmap_sss.c b/src/lib/cifs_idmap_sss/cifs_idmap_sss.c
new file mode 100644
index 00000000..f9149177
--- /dev/null
+++ b/src/lib/cifs_idmap_sss/cifs_idmap_sss.c
@@ -0,0 +1,340 @@
+/*
+ Authors:
+ Benjamin Franzke <benjaminfranzke@googlemail.com>
+
+ Copyright (C) 2013 Benjamin Franzke
+
+ 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/>.
+*/
+
+/* TODO: Support well known SIDs as in samba's
+ * - librpc/idl/security.idl or
+ * - source4/rpc_server/lsa/lsa_lookup.c?
+ */
+
+/* TODO: Support of [all] samba's Unix SIDs:
+ * Users: S-1-22-1-%UID
+ * Groups: S-1-22-2-%GID
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <limits.h>
+#include <stdarg.h>
+
+#include <cifsidmap.h>
+
+#include "lib/idmap/sss_idmap.h"
+#include "sss_client/idmap/sss_nss_idmap.h"
+
+#define WORLD_SID "S-1-1-0"
+
+#ifdef DEBUG
+#include <syslog.h>
+#define debug(str, ...) \
+ syslog(0, "%s: " str "\n", \
+ __FUNCTION__, ##__VA_ARGS__)
+#else
+#define debug(...) do { } while(0)
+#endif
+
+struct sssd_ctx {
+ struct sss_idmap_ctx *idmap;
+ const char **errmsg;
+};
+
+#define ctx_set_error(ctx, error) \
+ do { \
+ *ctx->errmsg = error; \
+ debug("%s", error ? error : ""); \
+ } while (0);
+
+int cifs_idmap_init_plugin(void **handle, const char **errmsg)
+{
+ struct sssd_ctx *ctx;
+ enum idmap_error_code err;
+
+ if (handle == NULL || errmsg == NULL)
+ return EINVAL;
+
+ ctx = malloc(sizeof *ctx);
+ if (!ctx) {
+ *errmsg = "Failed to allocate context";
+ return -1;
+ }
+ ctx->errmsg = errmsg;
+ ctx_set_error(ctx, NULL);
+
+ err = sss_idmap_init(NULL, NULL, NULL, &ctx->idmap);
+ if (err != IDMAP_SUCCESS) {
+ ctx_set_error(ctx, idmap_error_string(err));
+ free(ctx);
+ return -1;
+ }
+
+ *handle = ctx;
+ return 0;
+}
+
+void cifs_idmap_exit_plugin(void *handle)
+{
+ struct sssd_ctx *ctx = handle;
+
+ debug("exit");
+
+ if (ctx == NULL)
+ return;
+
+ sss_idmap_free(ctx->idmap);
+
+ free(ctx);
+}
+
+
+/* Test with `getcifsacl file` on client. */
+int cifs_idmap_sid_to_str(void *handle, const struct cifs_sid *csid,
+ char **name)
+{
+ struct sssd_ctx *ctx = handle;
+ enum idmap_error_code iderr;
+ char *sid;
+ enum sss_id_type id_type;
+ int err;
+
+ iderr = sss_idmap_bin_sid_to_sid(ctx->idmap, (const uint8_t *) csid,
+ sizeof(*csid), &sid);
+ if (iderr != IDMAP_SUCCESS) {
+ ctx_set_error(ctx, idmap_error_string(iderr));
+ *name = NULL;
+ return -1;
+ }
+
+ debug("sid: %s", sid);
+
+ if (strcmp(sid, WORLD_SID) == 0) {
+ *name = strdup("\\Everyone");
+ if (!*name) {
+ ctx_set_error(ctx, strerror(ENOMEM));
+ return ENOMEM;
+ }
+ return 0;
+ }
+
+ err = sss_nss_getnamebysid(sid, name, &id_type);
+ if (err != 0) {
+ ctx_set_error(ctx, strerror(err));
+ *name = NULL;
+ return -err;
+ }
+
+ /* FIXME: Map Samba Unix SIDs? (sid->id and use getpwuid)? */
+
+ debug("name: %s", *name);
+
+ return 0;
+}
+
+static int sid_to_cifs_sid(struct sssd_ctx *ctx, const char *sid,
+ struct cifs_sid *csid)
+{
+ uint8_t *bsid = NULL;
+ enum idmap_error_code err;
+ size_t length;
+
+ err = sss_idmap_sid_to_bin_sid(ctx->idmap,
+ sid, &bsid, &length);
+ if (err != IDMAP_SUCCESS) {
+ ctx_set_error(ctx, idmap_error_string(err));
+ return -1;
+ }
+ if (length > sizeof(struct cifs_sid)) {
+ ctx_set_error(ctx, "too large sid length");
+ free(bsid);
+ return -1;
+ }
+
+ memcpy(csid, bsid, length);
+ free(bsid);
+
+ return 0;
+}
+
+/* Test with setcifsacl -a */
+int cifs_idmap_str_to_sid(void *handle, const char *name,
+ struct cifs_sid *csid)
+{
+ struct sssd_ctx *ctx = handle;
+ int err;
+ enum sss_id_type id_type;
+ char *sid = NULL;
+ int success = 0;
+
+ debug("%s", name);
+
+ err = sss_nss_getsidbyname(name, &sid, &id_type);
+ if (err != 0) {
+ /* Might be a raw string representation of SID,
+ * try converting that before returning an error. */
+ if (sid_to_cifs_sid(ctx, name, csid) == 0)
+ return 0;
+
+ ctx_set_error(ctx, strerror(err));
+ return -err;
+ }
+
+ if (sid_to_cifs_sid(ctx, sid, csid) != 0)
+ success = -1;
+
+ free(sid);
+
+ return success;
+}
+
+static int samba_unix_sid_to_id(const char *sid, struct cifs_uxid *cuxid)
+{
+ id_t id;
+ uint8_t type;
+
+ if (sscanf(sid, "S-1-22-%hhu-%u", &type, &id) != 2)
+ return -1;
+
+ switch (type) {
+ case 1:
+ cuxid->type = CIFS_UXID_TYPE_UID;
+ cuxid->id.uid = id;
+ break;
+ case 2:
+ cuxid->type = CIFS_UXID_TYPE_GID;
+ cuxid->id.gid = id;
+ break;
+ default:
+ cuxid->type = CIFS_UXID_TYPE_UNKNOWN;
+ return -1;
+ }
+
+ return 0;
+}
+
+static int sss_sid_to_id(struct sssd_ctx *ctx, const char *sid,
+ struct cifs_uxid *cuxid)
+{
+ int err;
+ enum sss_id_type id_type;
+
+ err = sss_nss_getidbysid(sid, (uint32_t *)&cuxid->id.uid, &id_type);
+ if (err != 0) {
+ ctx_set_error(ctx, strerror(err));
+ return -1;
+ }
+
+ switch (id_type) {
+ case SSS_ID_TYPE_UID:
+ cuxid->type = CIFS_UXID_TYPE_UID;
+ break;
+ case SSS_ID_TYPE_GID:
+ cuxid->type = CIFS_UXID_TYPE_GID;
+ break;
+ case SSS_ID_TYPE_BOTH:
+ cuxid->type = CIFS_UXID_TYPE_BOTH;
+ break;
+ case SSS_ID_TYPE_NOT_SPECIFIED:
+ default:
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * cifs_idmap_sids_to_ids - convert struct cifs_sids to struct cifs_uxids
+ * usecase: mount.cifs -o sec=krb5,multiuser,cifsacl,nounix
+ * test: ls -n on mounted share
+ */
+int cifs_idmap_sids_to_ids(void *handle, const struct cifs_sid *csid,
+ const size_t num, struct cifs_uxid *cuxid)
+{
+ struct sssd_ctx *ctx = handle;
+ enum idmap_error_code err;
+ int success = -1;
+ size_t i;
+ char *sid;
+
+ debug("num: %zd", num);
+
+ if (num > UINT_MAX) {
+ ctx_set_error(ctx, "num is too large.");
+ return EINVAL;
+ }
+
+ for (i = 0; i < num; ++i) {
+ err = sss_idmap_bin_sid_to_sid(ctx->idmap, (const uint8_t *) &csid[i],
+ sizeof(csid[i]), &sid);
+ if (err != IDMAP_SUCCESS) {
+ ctx_set_error(ctx, idmap_error_string(err));
+ continue;
+ }
+
+ cuxid[i].type = CIFS_UXID_TYPE_UNKNOWN;
+
+ if (sss_sid_to_id(ctx, sid, &cuxid[i]) == 0 ||
+ samba_unix_sid_to_id(sid, &cuxid[i]) == 0) {
+
+ debug("setting uid of %s to %d", sid, cuxid[i].id.uid);
+ success = 0;
+ }
+
+ free(sid);
+ }
+
+ return success;
+}
+
+
+int cifs_idmap_ids_to_sids(void *handle, const struct cifs_uxid *cuxid,
+ const size_t num, struct cifs_sid *csid)
+{
+ struct sssd_ctx *ctx = handle;
+ int err, success = -1;
+ char *sid;
+ enum sss_id_type id_type;
+ size_t i;
+
+ debug("num ids: %zd", num);
+
+ if (num > UINT_MAX) {
+ ctx_set_error(ctx, "num is too large.");
+ return EINVAL;
+ }
+
+ for (i = 0; i < num; ++i) {
+ err = sss_nss_getsidbyid((uint32_t)cuxid[i].id.uid, &sid, &id_type);
+ if (err != 0) {
+ ctx_set_error(ctx, strerror(err));
+ csid[i].revision = 0;
+ /* FIXME: would it be safe to map *any* uid/gids unknown by sssd to
+ * SAMBA's UNIX SIDs? */
+ continue;
+ }
+
+ if (sid_to_cifs_sid(ctx, sid, csid) == 0)
+ success = 0;
+ else
+ csid[i].revision = 0;
+ free(sid);
+ }
+
+ return success;
+}
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