* Add new "auth-group=" parameter to protocol-native-unix

* Rename "public=" argument  of protocol-{esound,native} to "auth-anonymous"


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@601 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/daemon/main.c

@@ -160,7 +160,7 @@ int main(int argc, char *argv[]) {
 #ifdef HAVE_GETUID
     suid_root = getuid() != 0 && geteuid() == 0;
     
-    if (suid_root && (pa_uid_in_group("realtime", &gid) <= 0 || gid >= 1000)) {
+    if (suid_root && (pa_own_uid_in_group("realtime", &gid) <= 0 || gid >= 1000)) {
         pa_log_warn(__FILE__": WARNING: called SUID root, but not in group 'realtime'.");
         pa_drop_root();
     }

src/modules/module-protocol-stub.c

@@ -110,14 +110,23 @@
   #define TCPWRAP_SERVICE "polypaudio-native"
   #define IPV4_PORT PA_NATIVE_DEFAULT_PORT
   #define UNIX_SOCKET PA_NATIVE_DEFAULT_UNIX_SOCKET
-  #define MODULE_ARGUMENTS "public", "cookie",
+  #define MODULE_ARGUMENTS_COMMON "cookie", "auth-anonymous",
   #ifdef USE_TCP_SOCKETS
     #include "module-native-protocol-tcp-symdef.h"
   #else
     #include "module-native-protocol-unix-symdef.h"
   #endif
+
+  #if defined(SCM_CREDENTIALS) && !defined(USE_TCP_SOCKETS)
+    #define MODULE_ARGUMENTS MODULE_ARGUMENTS_COMMON "auth-group",
+    #define AUTH_USAGE "auth-group=<local group to allow access>"
+  #else
+    #define MODULE_ARGUMENTS MODULE_ARGUMENTS_COMMON
+    #define AUTH_USAGE
+  #endif
+  
   PA_MODULE_DESCRIPTION("Native protocol "SOCKET_DESCRIPTION)
-  PA_MODULE_USAGE("public=<don't check for cookies?> cookie=<path to cookie file> "SOCKET_USAGE)
+  PA_MODULE_USAGE("auth-anonymous=<don't check for cookies?> cookie=<path to cookie file> "AUTH_USAGE SOCKET_USAGE)
 #elif defined(USE_PROTOCOL_ESOUND)
   #include <polypcore/protocol-esound.h>
   #include <polypcore/esound.h>
@@ -126,14 +135,14 @@
   #define TCPWRAP_SERVICE "esound"
   #define IPV4_PORT ESD_DEFAULT_PORT
   #define UNIX_SOCKET ESD_UNIX_SOCKET_NAME
-  #define MODULE_ARGUMENTS "sink", "source", "public", "cookie",
+  #define MODULE_ARGUMENTS "sink", "source", "auth-anonymous", "cookie",
   #ifdef USE_TCP_SOCKETS
     #include "module-esound-protocol-tcp-symdef.h"
   #else
     #include "module-esound-protocol-unix-symdef.h"
   #endif
   PA_MODULE_DESCRIPTION("ESOUND protocol "SOCKET_DESCRIPTION)
-  PA_MODULE_USAGE("sink=<sink to connect to> source=<source to connect to> public=<don't check for cookies?> cookie=<path to cookie file> "SOCKET_USAGE)
+  PA_MODULE_USAGE("sink=<sink to connect to> source=<source to connect to> auth-anonymous=<don't check for cookies?> cookie=<path to cookie file> "SOCKET_USAGE)
 #else
   #error "Broken build system" 
 #endif

src/polypcore/protocol-esound.c

@@ -1139,8 +1139,8 @@ pa_protocol_esound* pa_protocol_esound_new(pa_core*core, pa_socket_server *serve
 
     p = pa_xnew(pa_protocol_esound, 1);
 
-    if (pa_modargs_get_value_boolean(ma, "public", &public) < 0) {
+    if (pa_modargs_get_value_boolean(ma, "auth-anonymous", &public) < 0) {
-        pa_log(__FILE__": public= expects a boolean argument.");
+        pa_log(__FILE__": auth-anonymous= expects a boolean argument.");
         return NULL;
     }
 

src/polypcore/protocol-native.c

@@ -129,6 +129,9 @@ struct pa_protocol_native {
     pa_idxset *connections;
     uint8_t auth_cookie[PA_NATIVE_COOKIE_LENGTH];
     int auth_cookie_in_property;
+#ifdef SCM_CREDENTIALS
+    char *auth_group;
+#endif
 };
 
 static int sink_input_peek_cb(pa_sink_input *i, pa_memchunk *chunk);
@@ -878,15 +881,22 @@ static void command_auth(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED uint32_t
         const struct ucred *ucred = pa_pdispatch_creds(pd);
 
         if (ucred) {
-            if (ucred->uid == getuid()) 
+            if (ucred->uid == getuid())
                 success = 1;
+            else if (c->protocol->auth_group) {
+                int r;
+                
+                if ((r = pa_uid_in_group(ucred->uid, c->protocol->auth_group)) < 0)
+                    pa_log_warn(__FILE__": failed to check group membership.");
+                else if (r > 0)
+                    success = 1;
+            }
                 
             pa_log_info(__FILE__": Got credentials: pid=%lu uid=%lu gid=%lu auth=%i",
                         (unsigned long) ucred->pid,
                         (unsigned long) ucred->uid,
                         (unsigned long) ucred->gid,
                         success);
-
         }
 #endif
 
@@ -2247,8 +2257,8 @@ static pa_protocol_native* protocol_new_internal(pa_core *c, pa_module *m, pa_mo
     int public = 0;
     assert(c && ma);
 
-    if (pa_modargs_get_value_boolean(ma, "public", &public) < 0) {
+    if (pa_modargs_get_value_boolean(ma, "auth-anonymous", &public) < 0) {
-        pa_log(__FILE__": public= expects a boolean argument.");
+        pa_log(__FILE__": auth-anonymous= expects a boolean argument.");
         return NULL;
     }
     
@@ -2258,6 +2268,10 @@ static pa_protocol_native* protocol_new_internal(pa_core *c, pa_module *m, pa_mo
     p->public = public;
     p->server = NULL;
 
+#ifdef SCM_CREDENTIALS
+    p->auth_group = pa_xstrdup(pa_modargs_get_value(ma, "auth-group", NULL));
+#endif
+    
     if (load_key(p, pa_modargs_get_value(ma, "cookie", NULL)) < 0) {
         pa_xfree(p);
         return NULL;
@@ -2317,6 +2331,9 @@ void pa_protocol_native_free(pa_protocol_native *p) {
     if (p->auth_cookie_in_property)
         pa_authkey_prop_unref(p->core, PA_NATIVE_COOKIE_PROPERTY_NAME);
 
+#ifdef SCM_CREDENTIALS
+    pa_xfree(p->auth_group);
+#endif
     pa_xfree(p);
 }
 

src/polypcore/util.c

@@ -166,7 +166,7 @@ int pa_make_secure_parent_dir(const char *fn) {
     int ret = -1;
     char *slash, *dir = pa_xstrdup(fn);
 
-    slash = pa_path_get_filename(dir);
+    slash = (char*) pa_path_get_filename(dir);
     if (slash == fn)
         goto finish;
     *(slash-1) = 0;
@@ -636,13 +636,13 @@ char *pa_get_binary_name(char *s, size_t l) {
 
 /* Return a pointer to the filename inside a path (which is the last
  * component). */
-char *pa_path_get_filename(const char *p) {
+const char *pa_path_get_filename(const char *p) {
     char *fn;
 
     if ((fn = strrchr(p, PATH_SEP)))
         return fn+1;
 
-    return (char*) p;
+    return (const char*) p;
 }
 
 /* Try to parse a boolean string value.*/
@@ -745,7 +745,6 @@ static int is_group(gid_t gid, const char *name) {
         goto finish;
     }
 
-    
     r = strcmp(name, result->gr_name) == 0;
     
 finish:
@@ -767,7 +766,7 @@ finish:
 }
 
 /* Check the current user is member of the specified group */
-int pa_uid_in_group(const char *name, gid_t *gid) {
+int pa_own_uid_in_group(const char *name, gid_t *gid) {
     GETGROUPS_T *gids, tgid;
     int n = sysconf(_SC_NGROUPS_MAX);
     int r = -1, i;
@@ -803,9 +802,50 @@ finish:
     return r;
 }
 
+int pa_uid_in_group(uid_t uid, const char *name) {
+    char *g_buf, *p_buf;
+    long g_n, p_n;
+    struct group grbuf, *gr;
+    char **i;
+    int r = -1;
+    
+    g_n = sysconf(_SC_GETGR_R_SIZE_MAX);
+    g_buf = pa_xmalloc(g_n);
+
+    p_n = sysconf(_SC_GETPW_R_SIZE_MAX);
+    p_buf = pa_xmalloc(p_n);
+    
+    if (getgrnam_r(name, &grbuf, g_buf, (size_t) g_n, &gr) != 0 || !gr)
+        goto finish;
+
+    r = 0;
+    for (i = gr->gr_mem; *i; i++) {
+        struct passwd pwbuf, *pw;
+        
+        if (getpwnam_r(*i, &pwbuf, p_buf, (size_t) p_n, &pw) != 0 || !pw)
+            continue;
+
+        if (pw->pw_uid == uid) {
+            r = 1;
+            break;
+        }
+    }
+
+finish:
+    pa_xfree(g_buf);
+    pa_xfree(p_buf);
+
+    return r;
+}
+
 #else /* HAVE_GRP_H */
 
-int pa_uid_in_group(const char *name, gid_t *gid) {
+int pa_own_uid_in_group(const char *name, gid_t *gid) {
+    return -1;
+    
+}
+
+int pa_uid_in_group(uid_t uid, const char *name) {
     return -1;
 }
 

src/polypcore/util.h

@@ -53,7 +53,7 @@ char *pa_get_fqdn(char *s, size_t l);
 char *pa_get_binary_name(char *s, size_t l);
 char *pa_get_home_dir(char *s, size_t l);
 
-char *pa_path_get_filename(const char *p);
+const char *pa_path_get_filename(const char *p);
 
 int pa_gettimeofday(struct timeval *tv);
 pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b);
@@ -75,7 +75,8 @@ char *pa_strip_nl(char *s);
 
 const char *pa_strsignal(int sig);
 
-int pa_uid_in_group(const char *name, gid_t *gid);
+int pa_own_uid_in_group(const char *name, gid_t *gid);
+int pa_uid_in_group(uid_t uid, const char *name);
 
 int pa_lock_fd(int fd, int b);