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fc3ae7490c
systemd/tty-ask-password-agent-on-console.patch

240 lines
7.8 KiB
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---
src/tty-ask-password-agent/tty-ask-password-agent.c | 171 +++++++++++++++++++-
1 file changed, 166 insertions(+), 5 deletions(-)
Index: systemd-221/src/tty-ask-password-agent/tty-ask-password-agent.c
===================================================================
--- systemd-221.orig/src/tty-ask-password-agent/tty-ask-password-agent.c
+++ systemd-221/src/tty-ask-password-agent/tty-ask-password-agent.c
@@ -31,6 +31,10 @@
#include <getopt.h>
#include <sys/signalfd.h>
#include <fcntl.h>
+#include <sys/prctl.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <sys/mman.h>
#include "util.h"
#include "mkdir.h"
@@ -42,6 +46,9 @@
#include "strv.h"
#include "build.h"
#include "def.h"
+#include "fileio.h"
+#include "macro.h"
+#include "list.h"
#include "process-util.h"
#include "terminal-util.h"
#include "signal-util.h"
@@ -53,6 +60,22 @@ static enum {
ACTION_WALL
} arg_action = ACTION_QUERY;
+struct console {
+ LIST_FIELDS(struct console, handle);
+ const char *tty;
+ pid_t pid;
+ int id;
+ char dev[];
+};
+
+static volatile unsigned long *usemask;
+static volatile sig_atomic_t sigchild;
+static void chld_handler(int sig)
+{
+ (void)sig;
+ ++sigchild;
+}
+
static bool arg_plymouth = false;
static bool arg_console = false;
@@ -211,6 +234,58 @@ static int ask_password_plymouth(
return 0;
}
+static const char *current_dev = "/dev/console";
+static LIST_HEAD(struct console, consoles);
+static int collect_consoles(void) {
+ _cleanup_free_ char *active = NULL;
+ const char *word, *state;
+ struct console *con;
+ size_t len;
+ int ret, id = 0;
+
+ ret = read_one_line_file("/sys/class/tty/console/active", &active);
+ if (ret < 0)
+ return ret;
+ FOREACH_WORD(word, len, active, state) {
+ _cleanup_free_ char *tty = NULL;
+
+ if (strneq(word, "tty0", len) &&
+ read_one_line_file("/sys/class/tty/tty0/active", &tty) >= 0) {
+ word = tty;
+ len = strlen(tty);
+ }
+ con = malloc0(sizeof(*con) + strlen("/dev/") + len + 1);
+ if (con == NULL) {
+ log_oom();
+ continue;
+ }
+ sprintf(con->dev, "/dev/%.*s", (int)len, word);
+ con->tty = con->dev;
+ con->id = id++;
+ LIST_PREPEND(handle, consoles, con);
+ }
+ if (consoles == NULL) {
+ con = malloc0(sizeof(*con));
+ if (con == NULL) {
+ log_oom();
+ return -ENOMEM;
+ }
+ con->tty = current_dev;
+ con->id = id++;
+ LIST_PREPEND(handle, consoles, con);
+ }
+ return 0;
+}
+
+static void free_consoles(void) {
+ struct console *c;
+ LIST_FOREACH(handle, c, consoles) {
+ LIST_REMOVE(handle, consoles, c);
+ free(c);
+ }
+ LIST_HEAD_INIT(consoles);
+}
+
static int parse_password(const char *filename, char **wall) {
_cleanup_free_ char *socket_name = NULL, *message = NULL, *packet = NULL;
uint64_t not_after = 0;
@@ -311,7 +386,7 @@ static int parse_password(const char *fi
_cleanup_free_ char *password = NULL;
if (arg_console) {
- tty_fd = acquire_terminal("/dev/console", false, false, false, USEC_INFINITY);
+ tty_fd = acquire_terminal(current_dev, false, false, false, USEC_INFINITY);
if (tty_fd < 0)
return tty_fd;
}
@@ -615,9 +690,85 @@ static int parse_argv(int argc, char *ar
return 1;
}
+static int zzz(void)
+{
+ struct console *con;
+ struct sigaction sig = {
+ .sa_handler = chld_handler,
+ .sa_flags = SA_NOCLDSTOP | SA_RESTART,
+ };
+ struct sigaction oldsig;
+ sigset_t set, oldset;
+ int status = 0, ret;
+ pid_t job;
+
+ collect_consoles();
+ if (!consoles->handle_next) {
+ consoles->pid = 0;
+ con = consoles;
+ goto nofork;
+ }
+
+ assert_se(sigemptyset(&set) == 0);
+ assert_se(sigaddset(&set, SIGHUP) == 0);
+ assert_se(sigaddset(&set, SIGCHLD) == 0);
+ assert_se(sigemptyset(&sig.sa_mask) == 0);
+ assert_se(sigprocmask(SIG_UNBLOCK, &set, &oldset) == 0);
+ assert_se(sigaction(SIGCHLD, &sig, &oldsig) == 0);
+ sig.sa_handler = SIG_DFL;
+ assert_se(sigaction(SIGHUP, &sig, NULL) == 0);
+
+ LIST_FOREACH(handle, con, consoles) {
+ switch ((con->pid = fork())) {
+ case 0:
+ if (prctl(PR_SET_PDEATHSIG, SIGHUP) < 0)
+ _exit(EXIT_FAILURE);
+ zero(sig);
+ assert_se(sigprocmask(SIG_UNBLOCK, &oldset, NULL) == 0);
+ assert_se(sigaction(SIGCHLD, &oldsig, NULL) == 0);
+ nofork:
+ setsid();
+ release_terminal();
+ *usemask |= 1 << con->id;
+ current_dev = con->tty;
+ return con->id; /* child */
+ case -1:
+ log_error("Failed to query password: %s", strerror(errno));
+ exit(EXIT_FAILURE);
+ default:
+ break;
+ }
+ }
+
+ ret = 0;
+ while ((job = wait(&status)) != 0) {
+ if (job < 0) {
+ if (errno != EINTR)
+ break;
+ continue;
+ }
+ LIST_FOREACH(handle, con, consoles) {
+ if (con->pid == job || kill(con->pid, 0) < 0) {
+ *usemask &= ~(1 << con->id);
+ continue;
+ }
+ if (*usemask & (1 << con->id))
+ continue;
+ kill(con->pid, SIGHUP);
+ usleep(50000);
+ kill(con->pid, SIGKILL);
+ }
+ if (WIFEXITED(status) && ret == 0)
+ ret = WEXITSTATUS(status);
+ }
+ free_consoles();
+ exit(ret != 0 ? EXIT_FAILURE : EXIT_SUCCESS); /* parent */
+}
+
int main(int argc, char *argv[]) {
- int r;
+ int r, id = 0;
+ LIST_HEAD_INIT(consoles);
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
@@ -628,11 +779,19 @@ int main(int argc, char *argv[]) {
if (r <= 0)
goto finish;
+ usemask = mmap(NULL, sizeof(*usemask), PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_SHARED, -1, 0);
+ assert_se(usemask != NULL);
+
if (arg_console) {
- setsid();
- release_terminal();
+ if (!arg_plymouth && arg_action != ACTION_WALL &&
+ arg_action != ACTION_LIST) {
+ id = zzz();
+ } else {
+ setsid();
+ release_terminal();
+ }
}
-
if (IN_SET(arg_action, ACTION_WATCH, ACTION_WALL))
r = watch_passwords();
else
@@ -641,6 +800,8 @@ int main(int argc, char *argv[]) {
if (r < 0)
log_error_errno(r, "Error: %m");
+ free_consoles();
+ *usemask &= ~(1 << id);
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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