IDMAP: add sss_idmap_smb_sid_to_unix()

To avoid a conversion on the caller side a new call is added to
libsss_idmap which converts a Samba dom_sid structure to a Posix ID.

2 files changed, 39 insertions, 0 deletions

diff --git a/src/lib/idmap/sss_idmap.c b/src/lib/idmap/sss_idmap.c
index 3615e9d5..1764b6f4 100644
--- a/src/lib/idmap/sss_idmap.c
+++ b/src/lib/idmap/sss_idmap.c
@@ -422,6 +422,28 @@ done:
     return err;
 }
 
+enum idmap_error_code sss_idmap_smb_sid_to_unix(struct sss_idmap_ctx *ctx,
+                                                struct dom_sid *smb_sid,
+                                                uint32_t *id)
+{
+    enum idmap_error_code err;
+    char *sid;
+
+    CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+
+    err = sss_idmap_smb_sid_to_sid(ctx, smb_sid, &sid);
+    if (err != IDMAP_SUCCESS) {
+        goto done;
+    }
+
+    err = sss_idmap_sid_to_unix(ctx, sid, id);
+
+done:
+    ctx->free_func(sid, ctx->alloc_pvt);
+
+    return err;
+}
+
 enum idmap_error_code sss_idmap_unix_to_dom_sid(struct sss_idmap_ctx *ctx,
                                                 uint32_t id,
                                                 struct sss_dom_sid **_dom_sid)
diff --git a/src/lib/idmap/sss_idmap.h b/src/lib/idmap/sss_idmap.h
index 22a4d548..ced7074a 100644
--- a/src/lib/idmap/sss_idmap.h
+++ b/src/lib/idmap/sss_idmap.h
@@ -200,6 +200,23 @@ enum idmap_error_code sss_idmap_bin_sid_to_unix(struct sss_idmap_ctx *ctx,
                                                 uint32_t *id);
 
 /**
+ * @brief Translate a Samba dom_sid stucture to a unix UID or GID
+ *
+ * @param[in] ctx     Idmap context
+ * @param[in] smb_sid Samba dom_sid structure
+ * @param[out] id     Returned unix UID or GID
+ *
+ * @return
+ *  - #IDMAP_NO_DOMAIN:     No domains are added to the idmap context
+ *  - #IDMAP_SID_INVALID:   Invalid SID provided
+ *  - #IDMAP_SID_UNKNOWN:   SID cannot be found in the domains added to the
+ *                          idmap context
+ */
+enum idmap_error_code sss_idmap_smb_sid_to_unix(struct sss_idmap_ctx *ctx,
+                                                struct dom_sid *smb_sid,
+                                                uint32_t *id);
+
+/**
  * @brief Translate unix UID or GID to a SID
  *
  * @param[in] ctx  Idmap context