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pulse-server: detect flatpak and pass on the pipewire connection

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This commit is contained in:
Wim Taymans 2021-02-04 17:18:33 +01:00
parent 32a3913933
commit be25a00ddb
1 changed files with 78 additions and 1 deletions
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79
src/modules/module-protocol-pulse/pulse-server.c
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@ -40,6 +40,8 @@
#include <sys/types.h>
#include <sys/time.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/vfs.h>
#if HAVE_PWD_H
#include <pwd.h>
#endif
@ -5212,6 +5214,76 @@ error:
client_unref(client);
}
static int check_flatpak(struct client *client, int pid)
{
char root_path[2048];
int root_fd, info_fd, res;
struct stat stat_buf;
sprintf(root_path, "/proc/%u/root", pid);
root_fd = openat (AT_FDCWD, root_path, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
if (root_fd == -1) {
res = -errno;
if (res == -EACCES) {
struct statfs buf;
/* Access to the root dir isn't allowed. This can happen if the root is on a fuse
* filesystem, such as in a toolbox container. We will never have a fuse rootfs
* in the flatpak case, so in that case its safe to ignore this and
* continue to detect other types of apps. */
if (statfs(root_path, &buf) == 0 &&
buf.f_type == 0x65735546) /* FUSE_SUPER_MAGIC */
return 0;
}
/* Not able to open the root dir shouldn't happen. Probably the app died and
* we're failing due to /proc/$pid not existing. In that case fail instead
* of treating this as privileged. */
pw_log_info("failed to open \"%s\": %s", root_path, spa_strerror(res));
return res;
}
info_fd = openat (root_fd, ".flatpak-info", O_RDONLY | O_CLOEXEC | O_NOCTTY);
close (root_fd);
if (info_fd == -1) {
if (errno == ENOENT) {
pw_log_debug("no .flatpak-info, client on the host");
/* No file => on the host */
return 0;
}
res = -errno;
pw_log_error("error opening .flatpak-info: %m");
return res;
}
if (fstat (info_fd, &stat_buf) != 0 || !S_ISREG (stat_buf.st_mode)) {
/* Some weird fd => failure, assume sandboxed */
close(info_fd);
pw_log_error("error fstat .flatpak-info: %m");
}
return 1;
}
static int get_client_pid(struct client *client, int client_fd)
{
socklen_t len;
#if defined(__linux__)
struct ucred ucred;
len = sizeof(ucred);
if (getsockopt(client_fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len) < 0) {
pw_log_warn(NAME": client %p: no peercred: %m", client);
} else
return ucred.pid;
#elif defined(__FreeBSD__)
struct xucred xucred;
len = sizeof(xucred);
if (getsockopt(client_fd, 0, LOCAL_PEERCRED, &xucred, &len) < 0) {
pw_log_warn(NAME": client %p: no peercred: %m", client);
} else {
#if __FreeBSD__ >= 13
return xucred.cr_pid;
#endif
}
#endif
return 0;
}
static void
on_connect(void *data, int fd, uint32_t mask)
{
@ -5219,7 +5291,7 @@ on_connect(void *data, int fd, uint32_t mask)
struct impl *impl = server->impl;
struct sockaddr_un name;
socklen_t length;
int client_fd, val;
int client_fd, val, pid;
struct client *client;
client = calloc(1, sizeof(struct client));
@ -5261,6 +5333,9 @@ on_connect(void *data, int fd, uint32_t mask)
(const void *) &val, sizeof(val)) < 0)
pw_log_warn("SO_PRIORITY failed: %m");
#endif
pid = get_client_pid(client, client_fd);
if (pid != 0 && check_flatpak(client, pid) == 1)
pw_properties_set(client->props, PW_KEY_CLIENT_ACCESS, "flatpak");
} else if (server->type == SERVER_TYPE_INET) {
val = 1;
if (setsockopt(client_fd, IPPROTO_TCP, TCP_NODELAY,
@ -5271,6 +5346,8 @@ on_connect(void *data, int fd, uint32_t mask)
if (setsockopt(client_fd, IPPROTO_IP, IP_TOS,
(const void *) &val, sizeof(val)) < 0)
pw_log_warn("IP_TOS failed: %m");
pw_properties_set(client->props, PW_KEY_CLIENT_ACCESS, "restricted");
}
client->source = pw_loop_add_io(impl->loop,