Implement SocketUser= and SocketGroup= for [Socket]

[elogind.git] / src / core / socket.c

diff --git a/src/core/socket.c b/src/core/socket.c
index 361404512c71701cafdc30f29d8d39c4cd642a13..f3f09cac4326133e8af4c9ecb3a8a4132fd3a0e7 100644 (file)
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -28,6 +28,7 @@
 #include <signal.h>
 #include <arpa/inet.h>
 #include <mqueue.h>
+#include <attr/xattr.h>
 
 #include "unit.h"
 #include "socket.h"
@@ -131,6 +132,16 @@ static void socket_done(Unit *u) {
         free(s->bind_to_device);
         s->bind_to_device = NULL;
 
+        free(s->smack);
+        free(s->smack_ip_in);
+        free(s->smack_ip_out);
+
+        free(s->socket_user);
+        s->socket_user = NULL;
+
+        free(s->socket_group);
+        s->socket_group = NULL;
+
         unit_unwatch_timer(u, &s->timer_watch);
 }
 
@@ -265,7 +276,8 @@ int socket_add_one_mount_link(Socket *s, Mount *m) {
         if (!socket_needs_mount(s, m->where))
                 return 0;
 
-        if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
+        r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
+        if (r < 0)
                 return r;
 
         return 0;
@@ -277,9 +289,11 @@ static int socket_add_mount_links(Socket *s) {
 
         assert(s);
 
-        LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT])
-                if ((r = socket_add_one_mount_link(s, MOUNT(other))) < 0)
+        LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT]) {
+                r = socket_add_one_mount_link(s, MOUNT(other));
+                if (r < 0)
                         return r;
+        }
 
         return 0;
 }
@@ -306,7 +320,7 @@ static int socket_add_default_dependencies(Socket *s) {
         int r;
         assert(s);
 
-        if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) {
+        if (UNIT(s)->manager->running_as == SYSTEMD_SYSTEM) {
                 if ((r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true)) < 0)
                         return r;
 
@@ -441,6 +455,16 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                 prefix, yes_no(s->pass_sec),
                 prefix, strna(s->tcp_congestion));
 
+        if (s->socket_user)
+                fprintf(f,
+                        "SocketUser: %s\n",
+                        s->socket_user);
+
+        if (s->socket_group)
+                fprintf(f,
+                        "SocketGroup: %s\n",
+                        s->socket_group);
+
         if (s->control_pid > 0)
                 fprintf(f,
                         "%sControl PID: %lu\n",
@@ -505,6 +529,21 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                         "%sMessageQueueMessageSize: %li\n",
                         prefix, s->mq_msgsize);
 
+        if (s->smack)
+                fprintf(f,
+                        "%sSmackLabel: %s\n",
+                        prefix, s->smack);
+
+        if (s->smack_ip_in)
+                fprintf(f,
+                        "%sSmackLabelIPIn: %s\n",
+                        prefix, s->smack_ip_in);
+
+        if (s->smack_ip_out)
+                fprintf(f,
+                        "%sSmackLabelIPOut: %s\n",
+                        prefix, s->smack_ip_out);
+
         LIST_FOREACH(port, p, s->ports) {
 
                 if (p->type == SOCKET_SOCKET) {
@@ -669,6 +708,9 @@ static void socket_close_fds(Socket *s) {
 }
 
 static void socket_apply_socket_options(Socket *s, int fd) {
+        uid_t uid = 0;
+        gid_t gid = 0;
+
         assert(s);
         assert(fd >= 0);
 
@@ -744,6 +786,29 @@ static void socket_apply_socket_options(Socket *s, int fd) {
         if (s->tcp_congestion)
                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
                         log_warning("TCP_CONGESTION failed: %m");
+
+        if (s->smack_ip_in)
+                if (fsetxattr(fd, "security.SMACK64IPIN", s->smack_ip_in, strlen(s->smack_ip_in), 0) < 0)
+                        log_error("fsetxattr(\"security.SMACK64IPIN\"): %m");
+
+        if (s->smack_ip_out)
+                if (fsetxattr(fd, "security.SMACK64IPOUT", s->smack_ip_out, strlen(s->smack_ip_out), 0) < 0)
+                        log_error("fsetxattr(\"security.SMACK64IPOUT\"): %m");
+
+        if (s->socket_user &&
+            get_user_creds((const char **)&s->socket_user, &uid,
+                                NULL, NULL, NULL) < 0) {
+                log_warning("failed to lookup user: %s", s->socket_user);
+        }
+
+        if (s->socket_group &&
+            get_group_creds((const char **)&s->socket_group, &gid) < 0) {
+                log_warning("failed to lookup group: %s", s->socket_group);
+        }
+
+        if ((uid != 0 || gid != 0) && fchown(fd, uid, gid) < 0) {
+                log_warning("failed to change ownership of socket");
+        }
 }
 
 static void socket_apply_fifo_options(Socket *s, int fd) {
@@ -753,17 +818,25 @@ static void socket_apply_fifo_options(Socket *s, int fd) {
         if (s->pipe_size > 0)
                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
                         log_warning("F_SETPIPE_SZ: %m");
+
+        if (s->smack)
+                if (fsetxattr(fd, "security.SMACK64", s->smack, strlen(s->smack), 0) < 0)
+                        log_error("fsetxattr(\"security.SMACK64\"): %m");
 }
 
 static int fifo_address_create(
                 const char *path,
                 mode_t directory_mode,
                 mode_t socket_mode,
+                const char *socket_user,
+                const char *socket_group,
                 int *_fd) {
 
         int fd = -1, r = 0;
         struct stat st;
         mode_t old_mask;
+        uid_t uid = 0;
+        gid_t gid = 0;
 
         assert(path);
         assert(_fd);
@@ -788,7 +861,8 @@ static int fifo_address_create(
                 goto fail;
         }
 
-        if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
+        fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
+        if (fd < 0) {
                 r = -errno;
                 goto fail;
         }
@@ -800,15 +874,35 @@ static int fifo_address_create(
                 goto fail;
         }
 
+        if (socket_user &&
+            get_user_creds(&socket_user, &uid, NULL, NULL, NULL) < 0) {
+                r = -errno;
+                log_error("failed to lookup user: %s", socket_user);
+                goto fail;
+        }
+
+        if (socket_group &&
+            get_group_creds(&socket_group, &gid) < 0) {
+                r = -errno;
+                log_error("failed to lookup group: %s", socket_group);
+                goto fail;
+        }
+
         if (!S_ISFIFO(st.st_mode) ||
             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
-            st.st_uid != getuid() ||
-            st.st_gid != getgid()) {
+            st.st_uid != uid ||
+            st.st_gid != gid) {
 
                 r = -EEXIST;
                 goto fail;
         }
 
+        if ((uid != 0 || gid != 0) && fchown(fd, uid, gid) < 0) {
+                r = -errno;
+                log_error("failed to changed ownership of FIFO: %s", path);
+                goto fail;
+        }
+
         *_fd = fd;
         return 0;
 
@@ -978,6 +1072,8 @@ static int socket_open_fds(Socket *s) {
                                              p->path,
                                              s->directory_mode,
                                              s->socket_mode,
+                                             s->socket_user,
+                                             s->socket_group,
                                              &p->fd)) < 0)
                                 goto rollback;