Moved credential-related code to nxt_credential.c.

This is required to avoid include cycles, as some nxt_clone_* functions
depend on the credential structures, but nxt_process depends on clone
structures.

9 files changed, 378 insertions, 353 deletions

diff --git a/auto/sources b/auto/sources
index 155e388b..33c1dcd4 100644
--- a/auto/sources
+++ b/auto/sources
@@ -13,6 +13,7 @@ NXT_LIB_SRCS=" \
     src/nxt_mem_map.c \
     src/nxt_socket.c \
     src/nxt_socketpair.c \
+    src/nxt_credential.c \
     src/nxt_process.c \
     src/nxt_process_title.c \
     src/nxt_signal.c \
diff --git a/src/nxt_credential.c b/src/nxt_credential.c
new file mode 100644
index 00000000..9f275b7d
--- /dev/null
+++ b/src/nxt_credential.c
@@ -0,0 +1,342 @@
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) NGINX, Inc.
+ */
+
+#include <nxt_main.h>
+
+
+static nxt_int_t nxt_credential_groups_get(nxt_task_t *task, nxt_mp_t *mp,
+    nxt_credential_t *uc);
+
+
+nxt_int_t
+nxt_credential_get(nxt_task_t *task, nxt_mp_t *mp, nxt_credential_t *uc,
+    const char *group)
+{
+    struct group   *grp;
+    struct passwd  *pwd;
+
+    nxt_errno = 0;
+
+    pwd = getpwnam(uc->user);
+
+    if (nxt_slow_path(pwd == NULL)) {
+
+        if (nxt_errno == 0) {
+            nxt_alert(task, "getpwnam(\"%s\") failed, user \"%s\" not found",
+                      uc->user, uc->user);
+        } else {
+            nxt_alert(task, "getpwnam(\"%s\") failed %E", uc->user, nxt_errno);
+        }
+
+        return NXT_ERROR;
+    }
+
+    uc->uid = pwd->pw_uid;
+    uc->base_gid = pwd->pw_gid;
+
+    if (group != NULL && group[0] != '\0') {
+        nxt_errno = 0;
+
+        grp = getgrnam(group);
+
+        if (nxt_slow_path(grp == NULL)) {
+
+            if (nxt_errno == 0) {
+                nxt_alert(task,
+                          "getgrnam(\"%s\") failed, group \"%s\" not found",
+                          group, group);
+            } else {
+                nxt_alert(task, "getgrnam(\"%s\") failed %E", group, nxt_errno);
+            }
+
+            return NXT_ERROR;
+        }
+
+        uc->base_gid = grp->gr_gid;
+    }
+
+    nxt_debug(task, "about to get \"%s\" groups (uid:%d, base gid:%d)",
+              uc->user, uc->uid, uc->base_gid);
+
+    if (nxt_credential_groups_get(task, mp, uc) != NXT_OK) {
+        return NXT_ERROR;
+    }
+
+#if (NXT_DEBUG)
+    {
+        u_char      *p, *end;
+        nxt_uint_t  i;
+        u_char      msg[NXT_MAX_ERROR_STR];
+
+        p = msg;
+        end = msg + NXT_MAX_ERROR_STR;
+
+        for (i = 0; i < uc->ngroups; i++) {
+            p = nxt_sprintf(p, end, "%d%c", uc->gids[i],
+                            i+1 < uc->ngroups ? ',' : '\0');
+        }
+
+        nxt_debug(task, "user \"%s\" has gids:%*s", uc->user, p - msg, msg);
+    }
+#endif
+
+    return NXT_OK;
+}
+
+
+#if (NXT_HAVE_GETGROUPLIST && !NXT_MACOSX)
+
+#define NXT_NGROUPS nxt_min(256, NGROUPS_MAX)
+
+
+static nxt_int_t
+nxt_credential_groups_get(nxt_task_t *task, nxt_mp_t *mp,
+    nxt_credential_t *uc)
+{
+    int    ngroups;
+    gid_t  groups[NXT_NGROUPS];
+
+    ngroups = NXT_NGROUPS;
+
+    if (getgrouplist(uc->user, uc->base_gid, groups, &ngroups) < 0) {
+        if (nxt_slow_path(ngroups <= NXT_NGROUPS)) {
+            nxt_alert(task, "getgrouplist(\"%s\", %d, ...) failed %E", uc->user,
+                      uc->base_gid, nxt_errno);
+
+            return NXT_ERROR;
+        }
+    }
+
+    if (ngroups > NXT_NGROUPS) {
+        if (ngroups > NGROUPS_MAX) {
+            ngroups = NGROUPS_MAX;
+        }
+
+        uc->ngroups = ngroups;
+
+        uc->gids = nxt_mp_alloc(mp, ngroups * sizeof(gid_t));
+        if (nxt_slow_path(uc->gids == NULL)) {
+            return NXT_ERROR;
+        }
+
+        if (nxt_slow_path(getgrouplist(uc->user, uc->base_gid, uc->gids,
+                                       &ngroups) < 0)) {
+
+            nxt_alert(task, "getgrouplist(\"%s\", %d) failed %E", uc->user,
+                      uc->base_gid, nxt_errno);
+
+            return NXT_ERROR;
+        }
+
+        return NXT_OK;
+    }
+
+    uc->ngroups = ngroups;
+
+    uc->gids = nxt_mp_alloc(mp, ngroups * sizeof(gid_t));
+    if (nxt_slow_path(uc->gids == NULL)) {
+        return NXT_ERROR;
+    }
+
+    nxt_memcpy(uc->gids, groups, ngroups * sizeof(gid_t));
+
+    return NXT_OK;
+}
+
+
+#else
+
+/*
+ * For operating systems that lack getgrouplist(3) or it's buggy (MacOS),
+ * nxt_credential_groups_get() stores an array of groups IDs which should be
+ * set by the setgroups() function for a given user.  The initgroups()
+ * may block a just forked worker process for some time if LDAP or NDIS+
+ * is used, so nxt_credential_groups_get() allows to get worker user groups in
+ * main process.  In a nutshell the initgroups() calls getgrouplist()
+ * followed by setgroups().  However older Solaris lacks the getgrouplist().
+ * Besides getgrouplist() does not allow to query the exact number of
+ * groups in some platforms, while NGROUPS_MAX can be quite large (e.g.
+ * 65536 on Linux).
+ * So nxt_credential_groups_get() emulates getgrouplist(): at first the
+ * function saves the super-user groups IDs, then calls initgroups() and saves
+ * the specified user groups IDs, and then restores the super-user groups IDs.
+ * This works at least on Linux, FreeBSD, and Solaris, but does not work
+ * on MacOSX, getgroups(2):
+ *
+ *   To provide compatibility with applications that use getgroups() in
+ *   environments where users may be in more than {NGROUPS_MAX} groups,
+ *   a variant of getgroups(), obtained when compiling with either the
+ *   macros _DARWIN_UNLIMITED_GETGROUPS or _DARWIN_C_SOURCE defined, can
+ *   be used that is not limited to {NGROUPS_MAX} groups.  However, this
+ *   variant only returns the user's default group access list and not
+ *   the group list modified by a call to setgroups(2).
+ *
+ * For such cases initgroups() is used in worker process as fallback.
+ */
+
+static nxt_int_t
+nxt_credential_groups_get(nxt_task_t *task, nxt_mp_t *mp, nxt_credential_t *uc)
+{
+    int        nsaved, ngroups;
+    nxt_int_t  ret;
+    nxt_gid_t  *saved;
+
+    nsaved = getgroups(0, NULL);
+
+    if (nxt_slow_path(nsaved == -1)) {
+        nxt_alert(task, "getgroups(0, NULL) failed %E", nxt_errno);
+        return NXT_ERROR;
+    }
+
+    nxt_debug(task, "getgroups(0, NULL): %d", nsaved);
+
+    if (nsaved > NGROUPS_MAX) {
+        /* MacOSX case. */
+
+        uc->gids = NULL;
+        uc->ngroups = 0;
+
+        return NXT_OK;
+    }
+
+    saved = nxt_mp_alloc(mp, nsaved * sizeof(nxt_gid_t));
+
+    if (nxt_slow_path(saved == NULL)) {
+        return NXT_ERROR;
+    }
+
+    ret = NXT_ERROR;
+
+    nsaved = getgroups(nsaved, saved);
+
+    if (nxt_slow_path(nsaved == -1)) {
+        nxt_alert(task, "getgroups(%d) failed %E", nsaved, nxt_errno);
+        goto free;
+    }
+
+    nxt_debug(task, "getgroups(): %d", nsaved);
+
+    if (initgroups(uc->user, uc->base_gid) != 0) {
+        if (nxt_errno == NXT_EPERM) {
+            nxt_log(task, NXT_LOG_NOTICE,
+                    "initgroups(%s, %d) failed %E, ignored",
+                    uc->user, uc->base_gid, nxt_errno);
+
+            ret = NXT_OK;
+
+            goto free;
+
+        } else {
+            nxt_alert(task, "initgroups(%s, %d) failed %E",
+                      uc->user, uc->base_gid, nxt_errno);
+            goto restore;
+        }
+    }
+
+    ngroups = getgroups(0, NULL);
+
+    if (nxt_slow_path(ngroups == -1)) {
+        nxt_alert(task, "getgroups(0, NULL) failed %E", nxt_errno);
+        goto restore;
+    }
+
+    nxt_debug(task, "getgroups(0, NULL): %d", ngroups);
+
+    uc->gids = nxt_mp_alloc(mp, ngroups * sizeof(nxt_gid_t));
+
+    if (nxt_slow_path(uc->gids == NULL)) {
+        goto restore;
+    }
+
+    ngroups = getgroups(ngroups, uc->gids);
+
+    if (nxt_slow_path(ngroups == -1)) {
+        nxt_alert(task, "getgroups(%d) failed %E", ngroups, nxt_errno);
+        goto restore;
+    }
+
+    uc->ngroups = ngroups;
+
+    ret = NXT_OK;
+
+restore:
+
+    if (nxt_slow_path(setgroups(nsaved, saved) != 0)) {
+        nxt_alert(task, "setgroups(%d) failed %E", nsaved, nxt_errno);
+        ret = NXT_ERROR;
+    }
+
+free:
+
+    nxt_mp_free(mp, saved);
+
+    return ret;
+}
+
+
+#endif
+
+
+nxt_int_t
+nxt_credential_set(nxt_task_t *task, nxt_credential_t *uc)
+{
+    nxt_debug(task, "user cred set: \"%s\" uid:%d base gid:%d",
+              uc->user, uc->uid, uc->base_gid);
+
+    if (setgid(uc->base_gid) != 0) {
+
+#if (NXT_HAVE_CLONE)
+        if (nxt_errno == EINVAL) {
+            nxt_log(task, NXT_LOG_ERR, "The gid %d isn't valid in the "
+                    "application namespace.", uc->base_gid);
+            return NXT_ERROR;
+        }
+#endif
+
+        nxt_alert(task, "setgid(%d) failed %E", uc->base_gid, nxt_errno);
+        return NXT_ERROR;
+    }
+
+    if (uc->gids != NULL) {
+        if (setgroups(uc->ngroups, uc->gids) != 0) {
+
+#if (NXT_HAVE_CLONE)
+            if (nxt_errno == EINVAL) {
+                nxt_log(task, NXT_LOG_ERR, "The user \"%s\" (uid: %d) has "
+                        "supplementary group ids not valid in the application "
+                        "namespace.", uc->user, uc->uid);
+                return NXT_ERROR;
+            }
+#endif
+
+            nxt_alert(task, "setgroups(%i) failed %E", uc->ngroups, nxt_errno);
+            return NXT_ERROR;
+        }
+
+    } else {
+        /* MacOSX fallback. */
+        if (initgroups(uc->user, uc->base_gid) != 0) {
+            nxt_alert(task, "initgroups(%s, %d) failed %E",
+                      uc->user, uc->base_gid, nxt_errno);
+            return NXT_ERROR;
+        }
+    }
+
+    if (setuid(uc->uid) != 0) {
+
+#if (NXT_HAVE_CLONE)
+        if (nxt_errno == EINVAL) {
+            nxt_log(task, NXT_LOG_ERR, "The uid %d (user \"%s\") isn't "
+                    "valid in the application namespace.", uc->uid, uc->user);
+            return NXT_ERROR;
+        }
+#endif
+
+        nxt_alert(task, "setuid(%d) failed %E", uc->uid, nxt_errno);
+        return NXT_ERROR;
+    }
+
+    return NXT_OK;
+}
diff --git a/src/nxt_credential.h b/src/nxt_credential.h
new file mode 100644
index 00000000..e9f59327
--- /dev/null
+++ b/src/nxt_credential.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef _NXT_CREDENTIAL_H_INCLUDED_
+#define _NXT_CREDENTIAL_H_INCLUDED_
+
+
+typedef uid_t   nxt_uid_t;
+typedef gid_t   nxt_gid_t;
+
+typedef struct {
+    const char  *user;
+    nxt_uid_t   uid;
+    nxt_gid_t   base_gid;
+    nxt_uint_t  ngroups;
+    nxt_gid_t   *gids;
+} nxt_credential_t;
+
+
+NXT_EXPORT nxt_int_t nxt_credential_get(nxt_task_t *task, nxt_mp_t *mp,
+    nxt_credential_t *uc, const char *group);
+NXT_EXPORT nxt_int_t nxt_credential_set(nxt_task_t *task,
+    nxt_credential_t *uc);
+
+
+#endif /* _NXT_CREDENTIAL_H_INCLUDED_ */
diff --git a/src/nxt_main.h b/src/nxt_main.h
index 0afebb96..d9e337d2 100644
--- a/src/nxt_main.h
+++ b/src/nxt_main.h
@@ -58,6 +58,7 @@ typedef uint16_t                     nxt_port_id_t;
 #include <nxt_thread.h>
 #include <nxt_process_type.h>
 #include <nxt_capability.h>
+#include <nxt_credential.h>
 #include <nxt_process.h>
 #include <nxt_utf8.h>
 #include <nxt_file_name.h>
diff --git a/src/nxt_main_process.c b/src/nxt_main_process.c
index 05027443..02b0c293 100644
--- a/src/nxt_main_process.c
+++ b/src/nxt_main_process.c
@@ -1677,8 +1677,7 @@ nxt_process_init_creds_set(nxt_task_t *task, nxt_process_init_t *init,
 {
     char  *str;
 
-    init->user_cred = nxt_mp_zalloc(init->mem_pool,
-                                    sizeof(nxt_user_cred_t));
+    init->user_cred = nxt_mp_zalloc(init->mem_pool, sizeof(nxt_credential_t));
 
     if (nxt_slow_path(init->user_cred == NULL)) {
         return NXT_ERROR;
@@ -1707,5 +1706,5 @@ nxt_process_init_creds_set(nxt_task_t *task, nxt_process_init_t *init,
         str = NULL;
     }
 
-    return nxt_user_cred_get(task, init->mem_pool, init->user_cred, str);
+    return nxt_credential_get(task, init->mem_pool, init->user_cred, str);
 }
diff --git a/src/nxt_process.c b/src/nxt_process.c
index 0cb0fbdd..75c6ef25 100644
--- a/src/nxt_process.c
+++ b/src/nxt_process.c
@@ -14,8 +14,6 @@
 #include <signal.h>
 
 static void nxt_process_start(nxt_task_t *task, nxt_process_t *process);
-static nxt_int_t nxt_user_groups_get(nxt_task_t *task, nxt_mp_t *mp,
-    nxt_user_cred_t *uc);
 static nxt_int_t nxt_process_worker_setup(nxt_task_t *task,
     nxt_process_t *process, int parentfd);
 
@@ -279,7 +277,7 @@ nxt_process_start(nxt_task_t *task, nxt_process_t *process)
     nxt_random_init(&thread->random);
 
     if (rt->capabilities.setid && init->user_cred != NULL) {
-        ret = nxt_user_cred_set(task, init->user_cred);
+        ret = nxt_credential_set(task, init->user_cred);
         if (ret != NXT_OK) {
             goto fail;
         }
@@ -526,337 +524,6 @@ nxt_nanosleep(nxt_nsec_t ns)
 }
 
 
-nxt_int_t
-nxt_user_cred_get(nxt_task_t *task, nxt_mp_t *mp, nxt_user_cred_t *uc,
-    const char *group)
-{
-    struct group   *grp;
-    struct passwd  *pwd;
-
-    nxt_errno = 0;
-
-    pwd = getpwnam(uc->user);
-
-    if (nxt_slow_path(pwd == NULL)) {
-
-        if (nxt_errno == 0) {
-            nxt_alert(task, "getpwnam(\"%s\") failed, user \"%s\" not found",
-                      uc->user, uc->user);
-        } else {
-            nxt_alert(task, "getpwnam(\"%s\") failed %E", uc->user, nxt_errno);
-        }
-
-        return NXT_ERROR;
-    }
-
-    uc->uid = pwd->pw_uid;
-    uc->base_gid = pwd->pw_gid;
-
-    if (group != NULL && group[0] != '\0') {
-        nxt_errno = 0;
-
-        grp = getgrnam(group);
-
-        if (nxt_slow_path(grp == NULL)) {
-
-            if (nxt_errno == 0) {
-                nxt_alert(task,
-                          "getgrnam(\"%s\") failed, group \"%s\" not found",
-                          group, group);
-            } else {
-                nxt_alert(task, "getgrnam(\"%s\") failed %E", group, nxt_errno);
-            }
-
-            return NXT_ERROR;
-        }
-
-        uc->base_gid = grp->gr_gid;
-    }
-
-    nxt_debug(task, "about to get \"%s\" groups (uid:%d, base gid:%d)",
-              uc->user, uc->uid, uc->base_gid);
-
-    if (nxt_user_groups_get(task, mp, uc) != NXT_OK) {
-        return NXT_ERROR;
-    }
-
-#if (NXT_DEBUG)
-    {
-        u_char      *p, *end;
-        nxt_uint_t  i;
-        u_char      msg[NXT_MAX_ERROR_STR];
-
-        p = msg;
-        end = msg + NXT_MAX_ERROR_STR;
-
-        for (i = 0; i < uc->ngroups; i++) {
-            p = nxt_sprintf(p, end, "%d%c", uc->gids[i],
-                            i+1 < uc->ngroups ? ',' : '\0');
-        }
-
-        nxt_debug(task, "user \"%s\" has gids:%*s", uc->user, p - msg, msg);
-    }
-#endif
-
-    return NXT_OK;
-}
-
-
-#if (NXT_HAVE_GETGROUPLIST && !NXT_MACOSX)
-
-#define NXT_NGROUPS nxt_min(256, NGROUPS_MAX)
-
-
-static nxt_int_t
-nxt_user_groups_get(nxt_task_t *task, nxt_mp_t *mp, nxt_user_cred_t *uc)
-{
-    int    ngroups;
-    gid_t  groups[NXT_NGROUPS];
-
-    ngroups = NXT_NGROUPS;
-
-    if (getgrouplist(uc->user, uc->base_gid, groups, &ngroups) < 0) {
-        if (nxt_slow_path(ngroups <= NXT_NGROUPS)) {
-            nxt_alert(task, "getgrouplist(\"%s\", %d, ...) failed %E", uc->user,
-                      uc->base_gid, nxt_errno);
-
-            return NXT_ERROR;
-        }
-    }
-
-    if (ngroups > NXT_NGROUPS) {
-        if (ngroups > NGROUPS_MAX) {
-            ngroups = NGROUPS_MAX;
-        }
-
-        uc->ngroups = ngroups;
-
-        uc->gids = nxt_mp_alloc(mp, ngroups * sizeof(gid_t));
-        if (nxt_slow_path(uc->gids == NULL)) {
-            return NXT_ERROR;
-        }
-
-        if (nxt_slow_path(getgrouplist(uc->user, uc->base_gid, uc->gids,
-                                       &ngroups) < 0)) {
-
-            nxt_alert(task, "getgrouplist(\"%s\", %d) failed %E", uc->user,
-                      uc->base_gid, nxt_errno);
-
-            return NXT_ERROR;
-        }
-
-        return NXT_OK;
-    }
-
-    uc->ngroups = ngroups;
-
-    uc->gids = nxt_mp_alloc(mp, ngroups * sizeof(gid_t));
-    if (nxt_slow_path(uc->gids == NULL)) {
-        return NXT_ERROR;
-    }
-
-    nxt_memcpy(uc->gids, groups, ngroups * sizeof(gid_t));
-
-    return NXT_OK;
-}
-
-
-#else
-
-/*
- * For operating systems that lack getgrouplist(3) or it's buggy (MacOS),
- * nxt_user_groups_get() stores an array of groups IDs which should be
- * set by the setgroups() function for a given user.  The initgroups()
- * may block a just forked worker process for some time if LDAP or NDIS+
- * is used, so nxt_user_groups_get() allows to get worker user groups in
- * main process.  In a nutshell the initgroups() calls getgrouplist()
- * followed by setgroups().  However older Solaris lacks the getgrouplist().
- * Besides getgrouplist() does not allow to query the exact number of
- * groups in some platforms, while NGROUPS_MAX can be quite large (e.g.
- * 65536 on Linux).
- * So nxt_user_groups_get() emulates getgrouplist(): at first the function
- * saves the super-user groups IDs, then calls initgroups() and saves the
- * specified user groups IDs, and then restores the super-user groups IDs.
- * This works at least on Linux, FreeBSD, and Solaris, but does not work
- * on MacOSX, getgroups(2):
- *
- *   To provide compatibility with applications that use getgroups() in
- *   environments where users may be in more than {NGROUPS_MAX} groups,
- *   a variant of getgroups(), obtained when compiling with either the
- *   macros _DARWIN_UNLIMITED_GETGROUPS or _DARWIN_C_SOURCE defined, can
- *   be used that is not limited to {NGROUPS_MAX} groups.  However, this
- *   variant only returns the user's default group access list and not
- *   the group list modified by a call to setgroups(2).
- *
- * For such cases initgroups() is used in worker process as fallback.
- */
-
-static nxt_int_t
-nxt_user_groups_get(nxt_task_t *task, nxt_mp_t *mp, nxt_user_cred_t *uc)
-{
-    int        nsaved, ngroups;
-    nxt_int_t  ret;
-    nxt_gid_t  *saved;
-
-    nsaved = getgroups(0, NULL);
-
-    if (nxt_slow_path(nsaved == -1)) {
-        nxt_alert(task, "getgroups(0, NULL) failed %E", nxt_errno);
-        return NXT_ERROR;
-    }
-
-    nxt_debug(task, "getgroups(0, NULL): %d", nsaved);
-
-    if (nsaved > NGROUPS_MAX) {
-        /* MacOSX case. */
-
-        uc->gids = NULL;
-        uc->ngroups = 0;
-
-        return NXT_OK;
-    }
-
-    saved = nxt_mp_alloc(mp, nsaved * sizeof(nxt_gid_t));
-
-    if (nxt_slow_path(saved == NULL)) {
-        return NXT_ERROR;
-    }
-
-    ret = NXT_ERROR;
-
-    nsaved = getgroups(nsaved, saved);
-
-    if (nxt_slow_path(nsaved == -1)) {
-        nxt_alert(task, "getgroups(%d) failed %E", nsaved, nxt_errno);
-        goto free;
-    }
-
-    nxt_debug(task, "getgroups(): %d", nsaved);
-
-    if (initgroups(uc->user, uc->base_gid) != 0) {
-        if (nxt_errno == NXT_EPERM) {
-            nxt_log(task, NXT_LOG_NOTICE,
-                    "initgroups(%s, %d) failed %E, ignored",
-                    uc->user, uc->base_gid, nxt_errno);
-
-            ret = NXT_OK;
-
-            goto free;
-
-        } else {
-            nxt_alert(task, "initgroups(%s, %d) failed %E",
-                      uc->user, uc->base_gid, nxt_errno);
-            goto restore;
-        }
-    }
-
-    ngroups = getgroups(0, NULL);
-
-    if (nxt_slow_path(ngroups == -1)) {
-        nxt_alert(task, "getgroups(0, NULL) failed %E", nxt_errno);
-        goto restore;
-    }
-
-    nxt_debug(task, "getgroups(0, NULL): %d", ngroups);
-
-    uc->gids = nxt_mp_alloc(mp, ngroups * sizeof(nxt_gid_t));
-
-    if (nxt_slow_path(uc->gids == NULL)) {
-        goto restore;
-    }
-
-    ngroups = getgroups(ngroups, uc->gids);
-
-    if (nxt_slow_path(ngroups == -1)) {
-        nxt_alert(task, "getgroups(%d) failed %E", ngroups, nxt_errno);
-        goto restore;
-    }
-
-    uc->ngroups = ngroups;
-
-    ret = NXT_OK;
-
-restore:
-
-    if (nxt_slow_path(setgroups(nsaved, saved) != 0)) {
-        nxt_alert(task, "setgroups(%d) failed %E", nsaved, nxt_errno);
-        ret = NXT_ERROR;
-    }
-
-free:
-
-    nxt_mp_free(mp, saved);
-
-    return ret;
-}
-
-
-#endif
-
-
-nxt_int_t
-nxt_user_cred_set(nxt_task_t *task, nxt_user_cred_t *uc)
-{
-    nxt_debug(task, "user cred set: \"%s\" uid:%d base gid:%d",
-              uc->user, uc->uid, uc->base_gid);
-
-    if (setgid(uc->base_gid) != 0) {
-
-#if (NXT_HAVE_CLONE)
-        if (nxt_errno == EINVAL) {
-            nxt_log(task, NXT_LOG_ERR, "The gid %d isn't valid in the "
-                    "application namespace.", uc->base_gid);
-            return NXT_ERROR;
-        }
-#endif
-
-        nxt_alert(task, "setgid(%d) failed %E", uc->base_gid, nxt_errno);
-        return NXT_ERROR;
-    }
-
-    if (uc->gids != NULL) {
-        if (setgroups(uc->ngroups, uc->gids) != 0) {
-
-#if (NXT_HAVE_CLONE)
-            if (nxt_errno == EINVAL) {
-                nxt_log(task, NXT_LOG_ERR, "The user \"%s\" (uid: %d) has "
-                        "supplementary group ids not valid in the application "
-                        "namespace.", uc->user, uc->uid);
-                return NXT_ERROR;
-            }
-#endif
-
-            nxt_alert(task, "setgroups(%i) failed %E", uc->ngroups, nxt_errno);
-            return NXT_ERROR;
-        }
-
-    } else {
-        /* MacOSX fallback. */
-        if (initgroups(uc->user, uc->base_gid) != 0) {
-            nxt_alert(task, "initgroups(%s, %d) failed %E",
-                      uc->user, uc->base_gid, nxt_errno);
-            return NXT_ERROR;
-        }
-    }
-
-    if (setuid(uc->uid) != 0) {
-
-#if (NXT_HAVE_CLONE)
-        if (nxt_errno == EINVAL) {
-            nxt_log(task, NXT_LOG_ERR, "The uid %d (user \"%s\") isn't "
-                    "valid in the application namespace.", uc->uid, uc->user);
-            return NXT_ERROR;
-        }
-#endif
-
-        nxt_alert(task, "setuid(%d) failed %E", uc->uid, nxt_errno);
-        return NXT_ERROR;
-    }
-
-    return NXT_OK;
-}
-
-
 void
 nxt_process_use(nxt_task_t *task, nxt_process_t *process, int i)
 {
diff --git a/src/nxt_process.h b/src/nxt_process.h
index 3f247ae1..457d2299 100644
--- a/src/nxt_process.h
+++ b/src/nxt_process.h
@@ -11,19 +11,9 @@
 
 
 typedef pid_t            nxt_pid_t;
-typedef uid_t            nxt_uid_t;
-typedef gid_t            nxt_gid_t;
 
 
 typedef struct {
-    const char           *user;
-    nxt_uid_t            uid;
-    nxt_gid_t            base_gid;
-    nxt_uint_t           ngroups;
-    nxt_gid_t            *gids;
-} nxt_user_cred_t;
-
-typedef struct {
     nxt_int_t            flags;
     nxt_conf_value_t     *uidmap;
     nxt_conf_value_t     *gidmap;
@@ -38,7 +28,7 @@ struct nxt_process_init_s {
     nxt_mp_t                   *mem_pool;
     nxt_process_start_t        start;
     const char                 *name;
-    nxt_user_cred_t            *user_cred;
+    nxt_credential_t           *user_cred;
 
     const nxt_port_handlers_t  *port_handlers;
     const nxt_sig_event_t      *signals;
@@ -153,9 +143,6 @@ NXT_EXPORT void nxt_process_title(nxt_task_t *task, const char *fmt, ...);
 #define nxt_abort()                                                           \
     (void) raise(SIGABRT)
 
-NXT_EXPORT nxt_int_t nxt_user_cred_get(nxt_task_t *task, nxt_mp_t *mp,
-    nxt_user_cred_t *uc, const char *group);
-NXT_EXPORT nxt_int_t nxt_user_cred_set(nxt_task_t *task, nxt_user_cred_t *uc);
 
 NXT_EXPORT extern nxt_pid_t  nxt_pid;
 NXT_EXPORT extern nxt_pid_t  nxt_ppid;
diff --git a/src/nxt_runtime.c b/src/nxt_runtime.c
index afd2cb66..80b25c1b 100644
--- a/src/nxt_runtime.c
+++ b/src/nxt_runtime.c
@@ -705,7 +705,7 @@ nxt_runtime_conf_init(nxt_task_t *task, nxt_runtime_t *rt)
     }
 
     if (rt->capabilities.setid) {
-        ret = nxt_user_cred_get(task, rt->mem_pool, &rt->user_cred,
+        ret = nxt_credential_get(task, rt->mem_pool, &rt->user_cred,
                                 rt->group);
 
         if (nxt_slow_path(ret != NXT_OK)) {
diff --git a/src/nxt_runtime.h b/src/nxt_runtime.h
index d5b340b6..f8d19ec6 100644
--- a/src/nxt_runtime.h
+++ b/src/nxt_runtime.h
@@ -58,7 +58,7 @@ struct nxt_runtime_s {
     const char             *engine;
     uint32_t               engine_connections;
     uint32_t               auxiliary_threads;
-    nxt_user_cred_t        user_cred;
+    nxt_credential_t       user_cred;
     nxt_capabilities_t     capabilities;
     const char             *group;
     const char             *pid;