add --user-map-root option

This makes client fake that given user is a superuser,
by changing FUSE requests coming with uid of user so that uid
is set to 0.

User can be given in numeric form, in which case it's treated
as an uid directly, or else it's tried to be resolved to an
uid with getpwnam(3).

Implies --acl.

Change-Id: I2d5a3d3e178be7ffdf22b46a56f33a7eeaaa7fe1
BUG: 3242
Reviewed-on: http://review.gluster.com/127
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index b79753519b3..42d3916d9c0 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -39,6 +39,7 @@
 #include <time.h>
 #include <semaphore.h>
 #include <errno.h>
+#include <pwd.h>
 
 #ifndef _CONFIG_H
 #define _CONFIG_H
@@ -176,6 +177,8 @@ static struct argp_option gf_options[] = {
          "[default: 1]"},
         {"client-pid", ARGP_CLIENT_PID_KEY, "PID", OPTION_HIDDEN,
          "client will authenticate itself with process id PID to server"},
+        {"user-map-root", ARGP_USER_MAP_ROOT_KEY, "USER", OPTION_HIDDEN,
+         "replace USER with root in messages"},
         {"dump-fuse", ARGP_DUMP_FUSE_KEY, "PATH", 0,
          "Dump fuse traffic to PATH"},
         {"volfile-check", ARGP_VOLFILE_CHECK_KEY, 0, 0,
@@ -276,6 +279,17 @@ create_fuse_mount (glusterfs_ctx_t *ctx)
                 }
         }
 
+        if (cmd_args->uid_map_root) {
+                ret = dict_set_int32 (master->options, "uid-map-root",
+                                      cmd_args->uid_map_root);
+                if (ret < 0) {
+                        gf_log ("glusterfsd", GF_LOG_ERROR,
+                                "failed to set dict value for key %s",
+                                "uid-map-root");
+                        goto err;
+                }
+        }
+
         if (cmd_args->volfile_check) {
                 ret = dict_set_int32 (master->options, ZR_STRICT_VOLFILE_CHECK,
                                       cmd_args->volfile_check);
@@ -485,6 +499,7 @@ parse_opts (int key, char *arg, struct argp_state *state)
         char          tmp_buf[2048] = {0,};
         char         *tmp_str       = NULL;
         char         *port_str      = NULL;
+        struct passwd *pw           = NULL;
 
         cmd_args = state->input;
 
@@ -678,6 +693,15 @@ parse_opts (int key, char *arg, struct argp_state *state)
                               "unknown client pid %s", arg);
                 break;
 
+        case ARGP_USER_MAP_ROOT_KEY:
+                pw = getpwnam (arg);
+                if (pw)
+                        cmd_args->uid_map_root = pw->pw_uid;
+                else
+                        argp_failure (state, -1, 0,
+                                      "user %s does not exist", arg);
+                break;
+
         case ARGP_VOLFILE_CHECK_KEY:
                 cmd_args->volfile_check = 1;
                 break;