From 1a3c4b9f378e3b04161e4f35b2efa5fae3d56a7b Mon Sep 17 00:00:00 2001
From: Stephen Gallagher <sgallagh@redhat.com>
Date: Oct 13 2010 13:49:37 +0000
Subject: Netgroups sysdb API


---

diff --git a/src/db/sysdb.c b/src/db/sysdb.c
index a2a94a5..4549226 100644
--- a/src/db/sysdb.c
+++ b/src/db/sysdb.c
@@ -52,6 +52,12 @@ struct ldb_dn *sysdb_group_dn(struct sysdb_ctx *ctx, void *memctx,
     return ldb_dn_new_fmt(memctx, ctx->ldb, SYSDB_TMPL_GROUP, name, domain);
 }
 
+struct ldb_dn *sysdb_netgroup_dn(struct sysdb_ctx *ctx, void *memctx,
+                                 const char *domain, const char *name)
+{
+    return ldb_dn_new_fmt(memctx, ctx->ldb, SYSDB_TMPL_NETGROUP, name, domain);
+}
+
 errno_t sysdb_group_dn_name(struct sysdb_ctx *ctx, void *memctx,
                             const char *_dn, char **_name)
 {
diff --git a/src/db/sysdb.h b/src/db/sysdb.h
index d8a78ba..a2b842f 100644
--- a/src/db/sysdb.h
+++ b/src/db/sysdb.h
@@ -35,12 +35,15 @@
 #define SYSDB_USERS_CONTAINER "cn=users"
 #define SYSDB_GROUPS_CONTAINER "cn=groups"
 #define SYSDB_CUSTOM_CONTAINER "cn=custom"
+#define SYSDB_NETGROUP_CONTAINER "cn=Netgroups"
 #define SYSDB_TMPL_USER_BASE SYSDB_USERS_CONTAINER",cn=%s,"SYSDB_BASE
 #define SYSDB_TMPL_GROUP_BASE SYSDB_GROUPS_CONTAINER",cn=%s,"SYSDB_BASE
 #define SYSDB_TMPL_CUSTOM_BASE SYSDB_CUSTOM_CONTAINER",cn=%s,"SYSDB_BASE
+#define SYSDB_TMPL_NETGROUP_BASE SYSDB_NETGROUP_CONTAINER",cn=%s,"SYSDB_BASE
 
 #define SYSDB_USER_CLASS "user"
 #define SYSDB_GROUP_CLASS "group"
+#define SYSDB_NETGROUP_CLASS "netgroup"
 
 #define SYSDB_NAME "name"
 #define SYSDB_OBJECTCLASS "objectClass"
@@ -75,6 +78,9 @@
 #define SYSDB_CACHE_EXPIRE "dataExpireTimestamp"
 #define SYSDB_INITGR_EXPIRE "initgrExpireTimestamp"
 
+#define SYSDB_NETGROUP_TRIPLE "netgroupTriple"
+#define SYSDB_DESCRIPTION   "description"
+
 #define SYSDB_CACHEDPWD "cachedPassword"
 
 #define SYSDB_UUID "uniqueID"
@@ -92,6 +98,7 @@
 
 #define SYSDB_UC "objectclass="SYSDB_USER_CLASS
 #define SYSDB_GC "objectclass="SYSDB_GROUP_CLASS
+#define SYSDB_NC "objectclass="SYSDB_NETGROUP_CLASS
 #define SYSDB_MPGC "|("SYSDB_UC")("SYSDB_GC")"
 
 #define SYSDB_PWNAM_FILTER "(&("SYSDB_UC")("SYSDB_NAME"=%s))"
@@ -110,6 +117,9 @@
 
 #define SYSDB_GETCACHED_FILTER "(&"SYSDB_UC")("SYSDB_LAST_LOGIN">=%lu))"
 
+#define SYSDB_NETGR_FILTER "(&("SYSDB_NC")("SYSDB_NAME"=%s))"
+#define SYSDB_NETGR_TRIPLES_FILTER "(|("SYSDB_NAME"=%s)("SYSDB_MEMBEROF"=%s))"
+
 #define SYSDB_DEFAULT_ATTRS SYSDB_LAST_UPDATE, \
                             SYSDB_CACHE_EXPIRE, \
                             SYSDB_INITGR_EXPIRE, \
@@ -131,6 +141,10 @@
                            SYSDB_DEFAULT_ATTRS, \
                            NULL}
 
+#define SYSDB_NETGR_ATTRS {SYSDB_NAME, SYSDB_NETGROUP_TRIPLE, \
+                           SYSDB_DEFAULT_ATTRS, \
+                           NULL}
+
 #define SYSDB_INITGR_ATTR SYSDB_MEMBEROF
 #define SYSDB_INITGR_ATTRS {SYSDB_GIDNUM, \
                             SYSDB_DEFAULT_ATTRS, \
@@ -138,6 +152,7 @@
 
 #define SYSDB_TMPL_USER SYSDB_NAME"=%s,"SYSDB_TMPL_USER_BASE
 #define SYSDB_TMPL_GROUP SYSDB_NAME"=%s,"SYSDB_TMPL_GROUP_BASE
+#define SYSDB_TMPL_NETGROUP SYSDB_NAME"=%s,"SYSDB_TMPL_NETGROUP_BASE
 #define SYSDB_TMPL_CUSTOM_SUBTREE "cn=%s,"SYSDB_TMPL_CUSTOM_BASE
 #define SYSDB_TMPL_CUSTOM SYSDB_NAME"=%s,cn=%s,"SYSDB_TMPL_CUSTOM_BASE
 
@@ -200,6 +215,8 @@ struct ldb_dn *sysdb_user_dn(struct sysdb_ctx *ctx, void *memctx,
                              const char *domain, const char *name);
 struct ldb_dn *sysdb_group_dn(struct sysdb_ctx *ctx, void *memctx,
                               const char *domain, const char *name);
+struct ldb_dn *sysdb_netgroup_dn(struct sysdb_ctx *ctx, void *memctx,
+                                 const char *domain, const char *name);
 errno_t sysdb_group_dn_name(struct sysdb_ctx *ctx, void *memctx,
                             const char *dn_str, char **name);
 struct ldb_dn *sysdb_domain_dn(struct sysdb_ctx *ctx, void *memctx,
@@ -282,6 +299,17 @@ int sysdb_enumgrent(TALLOC_CTX *mem_ctx,
                     struct sss_domain_info *domain,
                     struct ldb_result **res);
 
+struct sysdb_netgroup_ctx {
+    char *hostname;
+    char *username;
+    char *domainname;
+};
+errno_t sysdb_getnetgr(TALLOC_CTX *mem_ctx,
+                       struct sysdb_ctx *ctx,
+                       struct sss_domain_info *domain,
+                       const char *netgroup,
+                       struct ldb_result **res);
+
 int sysdb_initgroups(TALLOC_CTX *mem_ctx,
                      struct sysdb_ctx *ctx,
                      struct sss_domain_info *domain,
@@ -295,6 +323,12 @@ int sysdb_get_user_attr(TALLOC_CTX *mem_ctx,
                         const char **attributes,
                         struct ldb_result **res);
 
+int sysdb_get_netgroup_attr(TALLOC_CTX *mem_ctx,
+                            struct sysdb_ctx *ctx,
+                            struct sss_domain_info *domain,
+                            const char *netgrname,
+                            const char **attributes,
+                            struct ldb_result **res);
 
 /* functions that modify the databse
  * they have to be called within a transaction
@@ -336,7 +370,7 @@ int sysdb_search_user_by_uid(TALLOC_CTX *mem_ctx,
                              const char **attrs,
                              struct ldb_message **msg);
 
-/* Search Group (gy gid or name) */
+/* Search Group (by gid or name) */
 int sysdb_search_group_by_name(TALLOC_CTX *mem_ctx,
                                struct sysdb_ctx *ctx,
                                struct sss_domain_info *domain,
@@ -351,6 +385,14 @@ int sysdb_search_group_by_gid(TALLOC_CTX *mem_ctx,
                               const char **attrs,
                               struct ldb_message **msg);
 
+/* Search Netgroup (by name) */
+int sysdb_search_netgroup_by_name(TALLOC_CTX *mem_ctx,
+                                  struct sysdb_ctx *ctx,
+                                  struct sss_domain_info *domain,
+                                  const char *name,
+                                  const char **attrs,
+                                  struct ldb_message **msg);
+
 /* Replace entry attrs */
 int sysdb_set_entry_attr(TALLOC_CTX *mem_ctx,
                          struct sysdb_ctx *ctx,
@@ -374,6 +416,13 @@ int sysdb_set_group_attr(TALLOC_CTX *mem_ctx,
                          struct sysdb_attrs *attrs,
                          int mod_op);
 
+/* Replace netgroup attrs */
+int sysdb_set_netgroup_attr(struct sysdb_ctx *ctx,
+                            struct sss_domain_info *domain,
+                            const char *name,
+                            struct sysdb_attrs *attrs,
+                            int mod_op);
+
 /* Allocate a new id */
 int sysdb_get_new_id(TALLOC_CTX *mem_ctx,
                      struct sysdb_ctx *ctx,
@@ -416,6 +465,18 @@ int sysdb_add_group(TALLOC_CTX *mem_ctx,
                     struct sysdb_attrs *attrs,
                     int cache_timeout);
 
+/* Add netgroup (only basic attrs and w/o checks) */
+int sysdb_add_basic_netgroup(struct sysdb_ctx *ctx,
+                             struct sss_domain_info *domain,
+                             const char *name, const char *description);
+
+int sysdb_add_netgroup(struct sysdb_ctx *ctx,
+                       struct sss_domain_info *domain,
+                       const char *name,
+                       const char *description,
+                       struct sysdb_attrs *attrs,
+                       int cache_timeout);
+
 /* mod_op must be either LDB_FLAG_MOD_ADD or LDB_FLAG_MOD_DELETE */
 int sysdb_mod_group_member(TALLOC_CTX *mem_ctx,
                            struct sysdb_ctx *ctx,
@@ -460,6 +521,44 @@ errno_t sysdb_update_members(struct sysdb_ctx *sysdb,
                              const char **add_groups,
                              const char **del_groups);
 
+errno_t sysdb_add_netgroup_tuple(struct sysdb_ctx *sysdb,
+                                 struct sss_domain_info *domain,
+                                 const char *netgroup,
+                                 const char *hostname,
+                                 const char *username,
+                                 const char *domainname);
+
+errno_t sysdb_remove_netgroup_tuple(struct sysdb_ctx *sysdb,
+                                    struct sss_domain_info *domain,
+                                    const char *netgroup,
+                                    const char *hostname,
+                                    const char *username,
+                                    const char *domainname);
+
+errno_t sysdb_mod_netgroup_tuple(struct sysdb_ctx *sysdb,
+                                 struct sss_domain_info *domain,
+                                 const char *netgroup,
+                                 const char *hostname,
+                                 const char *username,
+                                 const char *domainname,
+                                 int mod_op);
+
+errno_t sysdb_add_netgroup_member(struct sysdb_ctx *sysdb,
+                                  struct sss_domain_info *domain,
+                                  const char *netgroup,
+                                  const char *member_netgroup);
+
+errno_t sysdb_remove_netgroup_member(struct sysdb_ctx *sysdb,
+                                     struct sss_domain_info *domain,
+                                     const char *netgroup,
+                                     const char *member_netgroup);
+
+errno_t sysdb_mod_netgroup_member(struct sysdb_ctx *sysdb,
+                                  struct sss_domain_info *domain,
+                                  const char *netgroup,
+                                  const char *member_netgroup,
+                                  int mod_op);
+
 /* Password caching function.
  * If you are in a transaction ignore sysdb and pass in the handle.
  * If you are not in a transaction pass NULL in handle and provide sysdb,
@@ -554,10 +653,18 @@ int sysdb_delete_group(TALLOC_CTX *mem_ctx,
                        struct sss_domain_info *domain,
                        const char *name, gid_t gid);
 
+int sysdb_delete_netgroup(struct sysdb_ctx *sysdb,
+                          struct sss_domain_info *domain,
+                          const char *name);
+
 errno_t sysdb_attrs_to_list(TALLOC_CTX *memctx,
                             struct sysdb_attrs **attrs,
                             int attr_count,
                             const char *attr_name,
                             char ***_list);
 
+errno_t sysdb_netgr_to_triples(TALLOC_CTX *mem_ctx,
+                               struct ldb_result *res,
+                               struct sysdb_netgroup_ctx ***triples);
+
 #endif /* __SYS_DB_H__ */
diff --git a/src/db/sysdb_ops.c b/src/db/sysdb_ops.c
index 14af948..373ce37 100644
--- a/src/db/sysdb_ops.c
+++ b/src/db/sysdb_ops.c
@@ -377,6 +377,49 @@ done:
 }
 
 
+/* =Search-Group-by-Name============================================ */
+
+int sysdb_search_netgroup_by_name(TALLOC_CTX *mem_ctx,
+                                  struct sysdb_ctx *ctx,
+                                  struct sss_domain_info *domain,
+                                  const char *name,
+                                  const char **attrs,
+                                  struct ldb_message **msg)
+{
+    TALLOC_CTX *tmpctx;
+    static const char *def_attrs[] = { SYSDB_NAME, NULL };
+    struct ldb_message **msgs = NULL;
+    struct ldb_dn *basedn;
+    size_t msgs_count = 0;
+    int ret;
+
+    tmpctx = talloc_new(mem_ctx);
+    if (!tmpctx) {
+        return ENOMEM;
+    }
+
+    basedn = sysdb_netgroup_dn(ctx, tmpctx, domain->name, name);
+    if (!basedn) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    ret = sysdb_search_entry(tmpctx, ctx, basedn, LDB_SCOPE_BASE, NULL,
+                             attrs?attrs:def_attrs, &msgs_count, &msgs);
+    if (ret) {
+        goto done;
+    }
+
+    *msg = talloc_steal(mem_ctx, msgs[0]);
+
+done:
+    if (ret) {
+        DEBUG(6, ("Error: %d (%s)\n", ret, strerror(ret)));
+    }
+    talloc_zfree(tmpctx);
+    return ret;
+}
+
 /* =Replace-Attributes-On-Entry=========================================== */
 
 int sysdb_set_entry_attr(TALLOC_CTX *mem_ctx,
@@ -463,6 +506,35 @@ int sysdb_set_group_attr(TALLOC_CTX *mem_ctx,
     return sysdb_set_entry_attr(mem_ctx, ctx, dn, attrs, mod_op);
 }
 
+/* =Replace-Attributes-On-Netgroup=========================================== */
+
+int sysdb_set_netgroup_attr(struct sysdb_ctx *ctx,
+                            struct sss_domain_info *domain,
+                            const char *name,
+                            struct sysdb_attrs *attrs,
+                            int mod_op)
+{
+    errno_t ret;
+    struct ldb_dn *dn;
+    TALLOC_CTX *tmp_ctx;
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    dn = sysdb_netgroup_dn(ctx, tmp_ctx, domain->name, name);
+    if (!dn) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    ret = sysdb_set_entry_attr(tmp_ctx, ctx, dn, attrs, mod_op);
+
+done:
+    talloc_free(tmp_ctx);
+    return ret;
+}
 
 /* =Get-New-ID============================================================ */
 
@@ -860,7 +932,7 @@ int sysdb_add_basic_group(TALLOC_CTX *mem_ctx,
         return ENOMEM;
     }
 
-    /* user dn */
+    /* group dn */
     msg->dn = sysdb_group_dn(ctx, msg, domain->name, name);
     if (!msg->dn) {
         ERROR_OUT(ret, ENOMEM, done);
@@ -1049,6 +1121,118 @@ fail:
     return ret;
 }
 
+/* =Add-Basic-Netgroup-NO-CHECKS============================================= */
+
+int sysdb_add_basic_netgroup(struct sysdb_ctx *ctx,
+                             struct sss_domain_info *domain,
+                             const char *name, const char *description)
+{
+    struct ldb_message *msg;
+    int ret;
+
+    msg = ldb_msg_new(NULL);
+    if (!msg) {
+        return ENOMEM;
+    }
+
+    /* netgroup dn */
+    msg->dn = sysdb_netgroup_dn(ctx, msg, domain->name, name);
+    if (!msg->dn) {
+        ERROR_OUT(ret, ENOMEM, done);
+    }
+
+    ret = add_string(msg, LDB_FLAG_MOD_ADD,
+                     SYSDB_OBJECTCLASS, SYSDB_NETGROUP_CLASS);
+    if (ret) goto done;
+
+    ret = add_string(msg, LDB_FLAG_MOD_ADD, SYSDB_NAME, name);
+    if (ret) goto done;
+
+    if (description && *description) {
+        ret = add_string(msg, LDB_FLAG_MOD_ADD,
+                         SYSDB_DESCRIPTION, description);
+        if (ret) goto done;
+    }
+
+    /* creation time */
+    ret = add_ulong(msg, LDB_FLAG_MOD_ADD, SYSDB_CREATE_TIME,
+                    (unsigned long) time(NULL));
+    if (ret) goto done;
+
+    ret = ldb_add(ctx->ldb, msg);
+    ret = sysdb_error_to_errno(ret);
+
+done:
+    if (ret) {
+        DEBUG(6, ("Error: %d (%s)\n", ret, strerror(ret)));
+    }
+    talloc_zfree(msg);
+    return ret;
+}
+
+
+/* =Add-Netgroup-Function==================================================== */
+
+int sysdb_add_netgroup(struct sysdb_ctx *ctx,
+                       struct sss_domain_info *domain,
+                       const char *name,
+                       const char *description,
+                       struct sysdb_attrs *attrs,
+                       int cache_timeout)
+{
+    TALLOC_CTX *tmp_ctx;
+    time_t now;
+    int ret;
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    ret = ldb_transaction_start(ctx->ldb);
+    if (ret) {
+        ret = sysdb_error_to_errno(ret);
+        talloc_free(tmp_ctx);
+        return ret;
+    }
+
+    /* try to add the netgroup */
+    ret = sysdb_add_basic_netgroup(ctx, domain, name, description);
+    if (ret) goto done;
+
+    if (!attrs) {
+        attrs = sysdb_new_attrs(tmp_ctx);
+        if (!attrs) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+
+    now = time(NULL);
+
+    ret = sysdb_attrs_add_time_t(attrs, SYSDB_LAST_UPDATE, now);
+    if (ret) goto done;
+
+    ret = sysdb_attrs_add_time_t(attrs, SYSDB_CACHE_EXPIRE,
+                                 ((cache_timeout) ?
+                                  (now + cache_timeout) : 0));
+    if (ret) goto done;
+
+    ret = sysdb_set_netgroup_attr(ctx, domain, name, attrs, SYSDB_MOD_REP);
+
+done:
+    if (ret == EOK) {
+        ret = ldb_transaction_commit(ctx->ldb);
+        ret = sysdb_error_to_errno(ret);
+    }
+
+    if (ret != EOK) {
+        DEBUG(6, ("Error: %d (%s)\n", ret, strerror(ret)));
+        ldb_transaction_cancel(ctx->ldb);
+    }
+    talloc_zfree(tmp_ctx);
+    return ret;
+}
 
 /* =Store-Users-(Native/Legacy)-(replaces-existing-data)================== */
 
@@ -1917,6 +2101,44 @@ fail:
     return ret;
 }
 
+/* =Delete-Netgroup-by-Name============================================== */
+
+int sysdb_delete_netgroup(struct sysdb_ctx *sysdb,
+                          struct sss_domain_info *domain,
+                          const char *name)
+{
+    TALLOC_CTX *tmp_ctx;
+    struct ldb_message *msg;
+    int ret;
+
+    if (!name) return EINVAL;
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    ret = sysdb_search_netgroup_by_name(tmp_ctx, sysdb,
+                                        domain, name, NULL, &msg);
+    if (ret != EOK) {
+        DEBUG(6, ("sysdb_search_netgroup_by_name failed: %d (%s)\n",
+                   ret, strerror(ret)));
+        goto done;
+    }
+
+    ret = sysdb_delete_entry(sysdb, msg->dn, false);
+    if (ret != EOK) {
+        goto done;
+    }
+
+done:
+    if (ret != EOK) {
+        DEBUG(6, ("Error: %d (%s)\n", ret, strerror(ret)));
+    }
+    talloc_free(tmp_ctx);
+    return ret;
+}
+
 /* ========= Authentication against cached password ============ */
 
 
@@ -2255,3 +2477,132 @@ done:
     talloc_free(tmp_ctx);
     return ret;
 }
+
+errno_t sysdb_add_netgroup_tuple(struct sysdb_ctx *sysdb,
+                                 struct sss_domain_info *domain,
+                                 const char *netgroup,
+                                 const char *hostname,
+                                 const char *username,
+                                 const char *domainname)
+{
+    return sysdb_mod_netgroup_tuple(sysdb, domain, netgroup, hostname,
+                                    username, domainname, SYSDB_MOD_ADD);
+}
+
+errno_t sysdb_remove_netgroup_tuple(struct sysdb_ctx *sysdb,
+                                    struct sss_domain_info *domain,
+                                    const char *netgroup,
+                                    const char *hostname,
+                                    const char *username,
+                                    const char *domainname)
+{
+    return sysdb_mod_netgroup_tuple(sysdb, domain, netgroup, hostname,
+                                    username, domainname, SYSDB_MOD_DEL);
+}
+
+errno_t sysdb_mod_netgroup_tuple(struct sysdb_ctx *sysdb,
+                                 struct sss_domain_info *domain,
+                                 const char *netgroup,
+                                 const char *hostname,
+                                 const char *username,
+                                 const char *domainname,
+                                 int mod_op)
+{
+    errno_t ret;
+    int lret;
+    struct ldb_message *msg;
+    char *triple;
+
+    msg = ldb_msg_new(NULL);
+    if (!msg) {
+        ERROR_OUT(ret, ENOMEM, done);
+    }
+
+    msg->dn = sysdb_netgroup_dn(sysdb, msg, domain->name, netgroup);
+    if (!msg->dn) {
+        ERROR_OUT(ret, ENOMEM, done);
+    }
+
+    triple = talloc_asprintf(msg, "(%s,%s,%s)",
+                             hostname, username, domainname);
+    if (!triple) {
+        ERROR_OUT(ret, ENOMEM, done);
+    }
+
+    ret = add_string(msg, mod_op, SYSDB_NETGROUP_TRIPLE, triple);
+    if (ret != EOK) {
+        goto done;
+    }
+
+    lret = ldb_modify(sysdb->ldb, msg);
+    ret = sysdb_error_to_errno(lret);
+
+done:
+    if (ret) {
+        DEBUG(3, ("Error: %d (%s)\n", ret, strerror(ret)));
+    }
+    talloc_free(msg);
+    return ret;
+}
+
+errno_t sysdb_add_netgroup_member(struct sysdb_ctx *sysdb,
+                                  struct sss_domain_info *domain,
+                                  const char *netgroup,
+                                  const char *member_netgroup)
+{
+    return sysdb_mod_netgroup_member(sysdb, domain, netgroup,
+                                     member_netgroup, SYSDB_MOD_ADD);
+}
+
+errno_t sysdb_remove_netgroup_member(struct sysdb_ctx *sysdb,
+                                  struct sss_domain_info *domain,
+                                  const char *netgroup,
+                                  const char *member_netgroup)
+{
+    return sysdb_mod_netgroup_member(sysdb, domain, netgroup,
+                                     member_netgroup, SYSDB_MOD_DEL);
+}
+
+errno_t sysdb_mod_netgroup_member(struct sysdb_ctx *sysdb,
+                                  struct sss_domain_info *domain,
+                                  const char *netgroup,
+                                  const char *member_netgroup,
+                                  int mod_op)
+{
+    errno_t ret;
+    int lret;
+    struct ldb_message *msg;
+    char *member;
+
+    msg = ldb_msg_new(NULL);
+    if (!msg) {
+        ERROR_OUT(ret, ENOMEM, done);
+    }
+
+    msg->dn = sysdb_netgroup_dn(sysdb, msg, domain->name, netgroup);
+    if (!msg->dn) {
+        ERROR_OUT(ret, ENOMEM, done);
+    }
+
+    member = talloc_asprintf(msg, SYSDB_TMPL_NETGROUP,
+                             member_netgroup, domain->name);
+    if (!member) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    ret = add_string(msg, mod_op, SYSDB_MEMBER, member);
+    if (ret != EOK) {
+        goto done;
+    }
+
+    lret = ldb_modify(sysdb->ldb, msg);
+    ret = sysdb_error_to_errno(lret);
+
+done:
+    if (ret) {
+        DEBUG(3, ("Error: %d (%s)\n", ret, strerror(ret)));
+    }
+    talloc_free(msg);
+    return ret;
+}
diff --git a/src/db/sysdb_search.c b/src/db/sysdb_search.c
index a24ea5b..91519e3 100644
--- a/src/db/sysdb_search.c
+++ b/src/db/sysdb_search.c
@@ -23,6 +23,7 @@
 #include "db/sysdb_private.h"
 #include "confdb/confdb.h"
 #include <time.h>
+#include <ctype.h>
 
 /* users */
 
@@ -503,3 +504,338 @@ done:
     talloc_zfree(tmpctx);
     return ret;
 }
+
+/* This function splits a three-tuple into three strings
+ * It assumes that any whitespace between the parentheses
+ * and commas are intentional and does not attempt to
+ * strip them out. Leading and trailing whitespace is
+ * ignored.
+ *
+ * This behavior is compatible with nss_ldap's
+ * implementation.
+ */
+static errno_t sysdb_netgr_split_triple(TALLOC_CTX *mem_ctx,
+                                        const char *triple,
+                                        char **hostname,
+                                        char **username,
+                                        char **domainname)
+{
+    errno_t ret;
+    TALLOC_CTX *tmp_ctx;
+    const char *p = triple;
+    const char *p_host;
+    const char *p_user;
+    const char *p_domain;
+    size_t len;
+
+    char *host = NULL;
+    char *user = NULL;
+    char *domain = NULL;
+
+    /* Pre-set the values to NULL here so if they are not
+     * copied, we don't return garbage below.
+     */
+    *hostname = NULL;
+    *username = NULL;
+    *domainname = NULL;
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    /* Remove any leading whitespace */
+    while (*p && isspace(*p)) p++;
+
+    if (*p != '(') {
+        /* Triple must start and end with parentheses */
+        ret = EINVAL;
+        goto done;
+    }
+    p++;
+    p_host = p;
+
+    /* Find the first comma */
+    while (*p && *p != ',') p++;
+
+    if (!*p) {
+        /* No comma was found: parse error */
+        ret = EINVAL;
+        goto done;
+    }
+
+    len = p - p_host;
+
+    if (len > 0) {
+        /* Copy the host string */
+        host = talloc_strndup(tmp_ctx, p_host, len);
+        if (!host) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+    p++;
+    p_user = p;
+
+    /* Find the second comma */
+    while (*p && *p != ',') p++;
+
+    if (!*p) {
+        /* No comma was found: parse error */
+        ret = EINVAL;
+        goto done;
+    }
+
+    len = p - p_user;
+
+    if (len > 0) {
+        /* Copy the user string */
+        user = talloc_strndup(tmp_ctx, p_user, len);
+        if (!user) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+    p++;
+    p_domain = p;
+
+    /* Find the closing parenthesis */
+    while (*p && *p != ')') p++;
+    if (*p != ')') {
+        /* No trailing parenthesis: parse error */
+        ret = EINVAL;
+        goto done;
+    }
+
+    len = p - p_domain;
+
+    if (len > 0) {
+        /* Copy the domain string */
+        domain = talloc_strndup(tmp_ctx, p_domain, len);
+        if (!domain) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+    p++;
+
+    /* skip trailing whitespace */
+    while (*p && isspace(*p)) p++;
+
+    if (*p) {
+        /* Extra data after the closing parenthesis
+         * is a parse error
+         */
+        ret = EINVAL;
+        goto done;
+    }
+
+    /* Return any non-NULL values */
+    if (host) {
+        *hostname = talloc_steal(mem_ctx, host);
+    }
+
+    if (user) {
+        *username = talloc_steal(mem_ctx, user);
+    }
+
+    if (domain) {
+        *domainname = talloc_steal(mem_ctx, domain);
+    }
+
+    ret = EOK;
+
+done:
+    talloc_free(tmp_ctx);
+    return ret;
+}
+
+errno_t sysdb_netgr_to_triples(TALLOC_CTX *mem_ctx,
+                               struct ldb_result *res,
+                               struct sysdb_netgroup_ctx ***triples)
+{
+    errno_t ret;
+    size_t size = 0;
+    char *triple_str;
+    TALLOC_CTX *tmp_ctx;
+    struct sysdb_netgroup_ctx **tmp_triples = NULL;
+    struct ldb_message_element *el;
+    int i, j;
+
+    if(!res || res->count == 0) {
+        return ENOENT;
+    }
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    for (i=0; i < res->count; i++) {
+        el = ldb_msg_find_element(res->msgs[i], SYSDB_NETGROUP_TRIPLE);
+        if (!el) {
+            /* No triples in this netgroup. It might be a nesting
+             * container only.
+             * Skip it and continue on.
+             */
+            continue;
+        }
+
+        /* Enlarge the array by the value count
+         * Always keep one extra entry for the NULL terminator
+         */
+        tmp_triples = talloc_realloc(tmp_ctx, tmp_triples,
+                                     struct sysdb_netgroup_ctx *,
+                                     size+el->num_values+1);
+        if (!tmp_triples) {
+            ret = ENOMEM;
+            goto done;
+        }
+
+        /* Copy in all of the triples */
+        for(j = 0; j < el->num_values; j++) {
+            triple_str = talloc_strndup(tmp_ctx,
+                                       (const char *)el->values[j].data,
+                                       el->values[j].length);
+            if (!triple_str) {
+                ret = ENOMEM;
+                goto done;
+            }
+
+            tmp_triples[size] = talloc_zero(tmp_triples,
+                                            struct sysdb_netgroup_ctx);
+            if (!tmp_triples[size]) {
+                ret = ENOMEM;
+                goto done;
+            }
+
+            ret = sysdb_netgr_split_triple(tmp_triples[size],
+                                           triple_str,
+                                           &tmp_triples[size]->hostname,
+                                           &tmp_triples[size]->username,
+                                           &tmp_triples[size]->domainname);
+            if (ret != EOK) {
+                goto done;
+            }
+
+            size++;
+        }
+    }
+
+    if (!tmp_triples) {
+        /* No entries were found
+         * Create a dummy reply
+         */
+        tmp_triples = talloc_array(tmp_ctx, struct sysdb_netgroup_ctx *, 1);
+        if (!tmp_triples) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+    /* Add NULL terminator */
+    tmp_triples[size] = NULL;
+
+    *triples = talloc_steal(mem_ctx, tmp_triples);
+    ret = EOK;
+
+done:
+    talloc_free(tmp_ctx);
+    return ret;
+}
+
+errno_t sysdb_getnetgr(TALLOC_CTX *mem_ctx,
+                       struct sysdb_ctx *ctx,
+                       struct sss_domain_info *domain,
+                       const char *netgroup,
+                       struct ldb_result **res)
+{
+    TALLOC_CTX *tmp_ctx;
+    static const char *attrs[] = SYSDB_NETGR_ATTRS;
+    struct ldb_dn *base_dn;
+    struct ldb_result *result;
+    char *netgroup_dn;
+    int lret;
+    errno_t ret;
+
+    if (!domain) {
+        return EINVAL;
+    }
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    base_dn = ldb_dn_new_fmt(tmp_ctx, ctx->ldb,
+                             SYSDB_TMPL_NETGROUP_BASE,
+                             domain->name);
+    if (!base_dn) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    netgroup_dn = talloc_asprintf(tmp_ctx, SYSDB_TMPL_NETGROUP,
+                                  netgroup, domain->name);
+    if (!netgroup_dn) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    lret = ldb_search(ctx->ldb, tmp_ctx, &result, base_dn,
+                     LDB_SCOPE_SUBTREE, attrs,
+                     SYSDB_NETGR_TRIPLES_FILTER,
+                     netgroup, netgroup_dn);
+    ret = sysdb_error_to_errno(lret);
+    if (ret != EOK) {
+        goto done;
+    }
+
+    *res = talloc_steal(mem_ctx, result);
+    ret = EOK;
+
+done:
+    talloc_zfree(tmp_ctx);
+    return ret;
+}
+
+int sysdb_get_netgroup_attr(TALLOC_CTX *mem_ctx,
+                            struct sysdb_ctx *ctx,
+                            struct sss_domain_info *domain,
+                            const char *netgrname,
+                            const char **attributes,
+                            struct ldb_result **res)
+{
+    TALLOC_CTX *tmpctx;
+    struct ldb_dn *base_dn;
+    struct ldb_result *result;
+    int ret;
+
+    if (!domain) {
+        return EINVAL;
+    }
+
+    tmpctx = talloc_new(mem_ctx);
+    if (!tmpctx) {
+        return ENOMEM;
+    }
+
+    base_dn = ldb_dn_new_fmt(tmpctx, ctx->ldb,
+                             SYSDB_TMPL_NETGROUP_BASE, domain->name);
+    if (!base_dn) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    ret = ldb_search(ctx->ldb, tmpctx, &result, base_dn,
+                     LDB_SCOPE_SUBTREE, attributes,
+                     SYSDB_NETGR_FILTER, netgrname);
+    if (ret) {
+        ret = sysdb_error_to_errno(ret);
+        goto done;
+    }
+
+    *res = talloc_steal(mem_ctx, result);
+done:
+    talloc_zfree(tmpctx);
+    return ret;
+}