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localsocket: implement SO_PEERCRED

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Matheus
2026-05-24 10:06:16 -03:00
parent d867dc0ad5
commit 7409cf5abf
1 changed files with 56 additions and 0 deletions
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kernel-src/io/net/localsocket.c
+56
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@@ -10,6 +10,12 @@
#define FILE_COUNT 16
#define BARRIER_SIZE 16
typedef struct {
pid_t pid;
uid_t uid;
gid_t gid;
} localsock_cred_t;
struct localpair_t;
struct binding_t;
typedef struct {
@@ -29,6 +35,7 @@ typedef struct {
uintmax_t barrierwrite; // shared with pair
int filesremaining[BARRIER_SIZE]; // shared with pair
int bytesremaining[BARRIER_SIZE]; // shared with pair
localsock_cred_t cred;
} localsocket_t;
// created by the client socket
@@ -575,6 +582,9 @@ static int localsock_accept(socket_t *_server, socket_t *_clientconnection, sock
clientconnection->pair = pair;
pair->server = clientconnection;
if (current_thread()->proc)
clientconnection->cred = server->cred;
// signal to the client that they can start sending data now
poll_event(&pair->client->socket.pollheader, POLLOUT);
@@ -608,6 +618,12 @@ static int localsock_connect(socket_t *socket, sockaddr_t *addr, uintmax_t flags
goto leave;
}
if (current_thread()->proc) {
localsocket->cred.pid = current_thread()->proc->pid;
localsocket->cred.uid = current_thread()->proc->cred.euid;
localsocket->cred.uid = current_thread()->proc->cred.egid;
}
// get the vnode specified in addr
refnode = addr->path[0] == '/' ? proc_get_root() : proc_get_cwd();
error = vfs_lookup(&result, refnode, addr->path, NULL, 0);
@@ -776,6 +792,12 @@ static int localsock_listen(socket_t *socket, int backlogsize) {
goto leave;
}
if (current_thread()->proc) {
localsocket->cred.pid = current_thread()->proc->pid;
localsocket->cred.uid = current_thread()->proc->cred.euid;
localsocket->cred.uid = current_thread()->proc->cred.egid;
}
MUTEX_ACQUIRE(&localsocket->binding->mutex);
localsocket->backlog = alloc(backlogsize * sizeof(localpair_t *));
@@ -985,6 +1007,13 @@ int localsock_pair(socket_t **ret1, socket_t **ret2) {
((localsocket_t *)socket1)->pair = pair;
((localsocket_t *)socket2)->pair = pair;
if (current_thread()->proc) {
pair->server->cred.pid = current_thread()->proc->pid;
pair->server->cred.uid = current_thread()->proc->cred.euid;
pair->server->cred.uid = current_thread()->proc->cred.egid;
pair->client->cred = pair->server->cred;
}
*ret1 = socket1;
*ret2 = socket2;
return 0;
@@ -1074,6 +1103,7 @@ static int localsock_setopt(socket_t *socket, int layer, int optname, void *buff
}
static int localsock_getopt(socket_t *socket, int layer, int optname, void *unsafe_buffer, socklen_t *unsafe_len, cred_t *cred) {
localsocket_t *localsocket = (localsocket_t *)socket;
socklen_t len;
int error = USERCOPY_POSSIBLY_FROM_USER(&len, unsafe_len, sizeof(len));
if (error)
@@ -1081,6 +1111,32 @@ static int localsock_getopt(socket_t *socket, int layer, int optname, void *unsa
if (layer == SOL_SOCKET) {
switch (optname) {
case SO_PEERCRED: {
if (len != sizeof(localsock_cred_t))
return EINVAL;
localpair_t *pair = localsocket->pair;
// socket not connected
if (pair == NULL) {
MUTEX_RELEASE(&socket->mutex);
return ENOTCONN;
}
MUTEX_ACQUIRE(&pair->mutex);
localsocket_t *peer = pair->client == localsocket ? pair->server : pair->client;
if (peer == NULL) {
MUTEX_RELEASE(&pair->mutex);
MUTEX_RELEASE(&socket->mutex);
return ENOTCONN;
}
localsock_cred_t cred = peer->cred;
MUTEX_RELEASE(&pair->mutex);
int error = USERCOPY_POSSIBLY_TO_USER(unsafe_buffer, &cred, sizeof(cred));
return error;
}
case SO_SNDLOWAT: {
int value = 1;
return USERCOPY_POSSIBLY_TO_USER(unsafe_buffer, &value, len);