1050 lines
33 KiB
C
1050 lines
33 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <poll.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/inotify.h>
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#include <sys/signalfd.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <termios.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "ask-password-api.h"
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#include "def.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "format-util.h"
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#include "fs-util.h"
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#include "io-util.h"
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#include "locale-util.h"
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#include "log.h"
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#include "macro.h"
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#include "memory-util.h"
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#include "missing_syscall.h"
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#include "mkdir.h"
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#include "process-util.h"
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#include "random-util.h"
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#include "signal-util.h"
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#include "socket-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "terminal-util.h"
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#include "time-util.h"
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#include "tmpfile-util.h"
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#include "umask-util.h"
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#include "utf8.h"
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#define KEYRING_TIMEOUT_USEC ((5 * USEC_PER_MINUTE) / 2)
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static int lookup_key(const char *keyname, key_serial_t *ret) {
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key_serial_t serial;
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assert(keyname);
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assert(ret);
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serial = request_key("user", keyname, NULL, 0);
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if (serial == -1)
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return negative_errno();
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*ret = serial;
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return 0;
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}
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static int retrieve_key(key_serial_t serial, char ***ret) {
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size_t nfinal, m = 100;
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char **l;
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_cleanup_(erase_and_freep) char *pfinal = NULL;
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assert(ret);
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for (;;) {
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_cleanup_(erase_and_freep) char *p = NULL;
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long n;
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p = new(char, m);
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if (!p)
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return -ENOMEM;
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n = keyctl(KEYCTL_READ, (unsigned long) serial, (unsigned long) p, (unsigned long) m, 0);
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if (n < 0)
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return -errno;
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if ((size_t) n <= m) {
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nfinal = (size_t) n;
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pfinal = TAKE_PTR(p);
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break;
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}
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if (m > LONG_MAX / 2) /* overflow check */
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return -ENOMEM;
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m *= 2;
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}
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l = strv_parse_nulstr(pfinal, nfinal);
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if (!l)
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return -ENOMEM;
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*ret = l;
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return 0;
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}
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static int add_to_keyring(const char *keyname, AskPasswordFlags flags, char **passwords) {
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_cleanup_strv_free_erase_ char **l = NULL;
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_cleanup_(erase_and_freep) char *p = NULL;
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key_serial_t serial;
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size_t n;
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int r;
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assert(keyname);
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if (!(flags & ASK_PASSWORD_PUSH_CACHE))
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return 0;
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if (strv_isempty(passwords))
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return 0;
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r = lookup_key(keyname, &serial);
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if (r >= 0) {
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r = retrieve_key(serial, &l);
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if (r < 0)
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return r;
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} else if (r != -ENOKEY)
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return r;
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r = strv_extend_strv(&l, passwords, true);
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if (r <= 0)
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return r;
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r = strv_make_nulstr(l, &p, &n);
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if (r < 0)
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return r;
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serial = add_key("user", keyname, p, n, KEY_SPEC_USER_KEYRING);
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if (serial == -1)
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return -errno;
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if (keyctl(KEYCTL_SET_TIMEOUT,
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(unsigned long) serial,
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(unsigned long) DIV_ROUND_UP(KEYRING_TIMEOUT_USEC, USEC_PER_SEC), 0, 0) < 0)
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log_debug_errno(errno, "Failed to adjust kernel keyring key timeout: %m");
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/* Tell everyone to check the keyring */
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(void) touch("/run/systemd/ask-password");
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log_debug("Added key to kernel keyring as %" PRIi32 ".", serial);
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return 1;
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}
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static int add_to_keyring_and_log(const char *keyname, AskPasswordFlags flags, char **passwords) {
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int r;
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assert(keyname);
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r = add_to_keyring(keyname, flags, passwords);
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if (r < 0)
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return log_debug_errno(r, "Failed to add password to kernel keyring: %m");
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return 0;
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}
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static int ask_password_keyring(const char *keyname, AskPasswordFlags flags, char ***ret) {
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key_serial_t serial;
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int r;
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assert(keyname);
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assert(ret);
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if (!(flags & ASK_PASSWORD_ACCEPT_CACHED))
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return -EUNATCH;
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r = lookup_key(keyname, &serial);
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if (ERRNO_IS_NOT_SUPPORTED(r) || r == -EPERM) /* when retrieving the distinction between "kernel or
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* container manager don't support or allow this" and
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* "no matching key known" doesn't matter. Note that we
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* propagate EACCESS here (even if EPERM not) since
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* that is used if the keyring is available but we lack
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* access to the key. */
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return -ENOKEY;
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if (r < 0)
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return r;
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return retrieve_key(serial, ret);
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}
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static int backspace_chars(int ttyfd, size_t p) {
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if (ttyfd < 0)
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return 0;
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_cleanup_free_ char *buf = malloc_multiply(3, p);
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if (!buf)
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return log_oom();
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for (size_t i = 0; i < p; i++)
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memcpy(buf + 3 * i, "\b \b", 3);
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return loop_write(ttyfd, buf, 3*p, false);
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}
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static int backspace_string(int ttyfd, const char *str) {
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assert(str);
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/* Backspaces through enough characters to entirely undo printing of the specified string. */
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if (ttyfd < 0)
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return 0;
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size_t m = utf8_n_codepoints(str);
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if (m == (size_t) -1)
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m = strlen(str); /* Not a valid UTF-8 string? If so, let's backspace the number of bytes
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* output. Most likely this happened because we are not in an UTF-8 locale,
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* and in that case that is the correct thing to do. And even if it's not,
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* terminals tend to stop backspacing at the leftmost column, hence
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* backspacing too much should be mostly OK. */
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return backspace_chars(ttyfd, m);
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}
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int ask_password_plymouth(
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const char *message,
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usec_t until,
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AskPasswordFlags flags,
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const char *flag_file,
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char ***ret) {
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static const union sockaddr_union sa = PLYMOUTH_SOCKET;
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_cleanup_close_ int fd = -1, notify = -1;
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_cleanup_free_ char *packet = NULL;
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ssize_t k;
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int r, n;
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struct pollfd pollfd[2] = {};
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char buffer[LINE_MAX];
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size_t p = 0;
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enum {
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POLL_SOCKET,
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POLL_INOTIFY
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};
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assert(ret);
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if (!message)
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message = "Password:";
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if (flag_file) {
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notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
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if (notify < 0)
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return -errno;
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r = inotify_add_watch(notify, flag_file, IN_ATTRIB); /* for the link count */
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if (r < 0)
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return -errno;
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}
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fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (fd < 0)
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return -errno;
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r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
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if (r < 0)
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return -errno;
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if (flags & ASK_PASSWORD_ACCEPT_CACHED) {
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packet = strdup("c");
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n = 1;
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} else if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0)
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packet = NULL;
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if (!packet)
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return -ENOMEM;
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r = loop_write(fd, packet, n + 1, true);
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if (r < 0)
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return r;
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pollfd[POLL_SOCKET].fd = fd;
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pollfd[POLL_SOCKET].events = POLLIN;
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pollfd[POLL_INOTIFY].fd = notify;
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pollfd[POLL_INOTIFY].events = POLLIN;
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for (;;) {
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int sleep_for = -1, j;
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if (until > 0) {
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usec_t y;
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y = now(CLOCK_MONOTONIC);
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if (y > until) {
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r = -ETIME;
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goto finish;
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}
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sleep_for = (int) ((until - y) / USEC_PER_MSEC);
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}
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if (flag_file && access(flag_file, F_OK) < 0) {
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r = -errno;
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goto finish;
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}
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j = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for);
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if (j < 0) {
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if (errno == EINTR)
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continue;
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r = -errno;
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goto finish;
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} else if (j == 0) {
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r = -ETIME;
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goto finish;
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}
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if (pollfd[POLL_SOCKET].revents & POLLNVAL ||
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(notify >= 0 && pollfd[POLL_INOTIFY].revents & POLLNVAL)) {
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r = -EBADF;
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goto finish;
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}
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if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0)
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(void) flush_fd(notify);
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if (pollfd[POLL_SOCKET].revents == 0)
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continue;
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k = read(fd, buffer + p, sizeof(buffer) - p);
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if (k < 0) {
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if (IN_SET(errno, EINTR, EAGAIN))
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continue;
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r = -errno;
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goto finish;
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} else if (k == 0) {
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r = -EIO;
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goto finish;
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}
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p += k;
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if (p < 1)
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continue;
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if (buffer[0] == 5) {
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if (flags & ASK_PASSWORD_ACCEPT_CACHED) {
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/* Hmm, first try with cached
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* passwords failed, so let's retry
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* with a normal password request */
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packet = mfree(packet);
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if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) {
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r = -ENOMEM;
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goto finish;
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}
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r = loop_write(fd, packet, n+1, true);
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if (r < 0)
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goto finish;
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flags &= ~ASK_PASSWORD_ACCEPT_CACHED;
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p = 0;
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continue;
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}
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/* No password, because UI not shown */
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r = -ENOENT;
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goto finish;
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} else if (IN_SET(buffer[0], 2, 9)) {
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uint32_t size;
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char **l;
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/* One or more answers */
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if (p < 5)
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continue;
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memcpy(&size, buffer+1, sizeof(size));
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size = le32toh(size);
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if (size + 5 > sizeof(buffer)) {
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r = -EIO;
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goto finish;
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}
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if (p-5 < size)
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continue;
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l = strv_parse_nulstr(buffer + 5, size);
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if (!l) {
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r = -ENOMEM;
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goto finish;
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}
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*ret = l;
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break;
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} else {
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/* Unknown packet */
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r = -EIO;
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goto finish;
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}
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}
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r = 0;
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finish:
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explicit_bzero_safe(buffer, sizeof(buffer));
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return r;
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}
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#define NO_ECHO "(no echo) "
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#define PRESS_TAB "(press TAB for no echo) "
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#define SKIPPED "(skipped)"
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int ask_password_tty(
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int ttyfd,
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const char *message,
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const char *keyname,
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usec_t until,
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AskPasswordFlags flags,
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const char *flag_file,
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char ***ret) {
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enum {
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POLL_TTY,
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POLL_INOTIFY,
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_POLL_MAX,
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};
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bool reset_tty = false, dirty = false, use_color = false, press_tab_visible = false;
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_cleanup_close_ int cttyfd = -1, notify = -1;
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struct termios old_termios, new_termios;
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char passphrase[LINE_MAX + 1] = {}, *x;
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_cleanup_strv_free_erase_ char **l = NULL;
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struct pollfd pollfd[_POLL_MAX];
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size_t p = 0, codepoint = 0;
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int r;
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assert(ret);
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if (flags & ASK_PASSWORD_NO_TTY)
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return -EUNATCH;
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if (!message)
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message = "Password:";
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if (emoji_enabled())
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message = strjoina(special_glyph(SPECIAL_GLYPH_LOCK_AND_KEY), " ", message);
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if (flag_file || ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname)) {
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notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
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if (notify < 0)
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return -errno;
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}
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if (flag_file) {
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if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0)
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return -errno;
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}
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if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname) {
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r = ask_password_keyring(keyname, flags, ret);
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if (r >= 0)
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return 0;
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else if (r != -ENOKEY)
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return r;
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|
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if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_ATTRIB /* for mtime */) < 0)
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return -errno;
|
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}
|
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|
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/* If the caller didn't specify a TTY, then use the controlling tty, if we can. */
|
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if (ttyfd < 0)
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ttyfd = cttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC);
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|
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if (ttyfd >= 0) {
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if (tcgetattr(ttyfd, &old_termios) < 0)
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return -errno;
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|
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if (flags & ASK_PASSWORD_CONSOLE_COLOR)
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use_color = dev_console_colors_enabled();
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else
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use_color = colors_enabled();
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|
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if (use_color)
|
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(void) loop_write(ttyfd, ANSI_HIGHLIGHT, STRLEN(ANSI_HIGHLIGHT), false);
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|
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(void) loop_write(ttyfd, message, strlen(message), false);
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(void) loop_write(ttyfd, " ", 1, false);
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|
|
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if (!(flags & ASK_PASSWORD_SILENT) && !(flags & ASK_PASSWORD_ECHO)) {
|
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if (use_color)
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(void) loop_write(ttyfd, ANSI_GREY, STRLEN(ANSI_GREY), false);
|
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(void) loop_write(ttyfd, PRESS_TAB, strlen(PRESS_TAB), false);
|
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press_tab_visible = true;
|
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}
|
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|
|
if (use_color)
|
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(void) loop_write(ttyfd, ANSI_NORMAL, STRLEN(ANSI_NORMAL), false);
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|
|
new_termios = old_termios;
|
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new_termios.c_lflag &= ~(ICANON|ECHO);
|
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new_termios.c_cc[VMIN] = 1;
|
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new_termios.c_cc[VTIME] = 0;
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|
|
if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
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r = -errno;
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goto finish;
|
|
}
|
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|
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reset_tty = true;
|
|
}
|
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|
|
pollfd[POLL_TTY] = (struct pollfd) {
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.fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO,
|
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.events = POLLIN,
|
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};
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pollfd[POLL_INOTIFY] = (struct pollfd) {
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.fd = notify,
|
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.events = POLLIN,
|
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};
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|
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for (;;) {
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_cleanup_(erase_char) char c;
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int sleep_for = -1, k;
|
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ssize_t n;
|
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|
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if (until > 0) {
|
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usec_t y;
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|
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y = now(CLOCK_MONOTONIC);
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|
|
|
if (y > until) {
|
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r = -ETIME;
|
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goto finish;
|
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}
|
|
|
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sleep_for = (int) DIV_ROUND_UP(until - y, USEC_PER_MSEC);
|
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}
|
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|
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if (flag_file)
|
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if (access(flag_file, F_OK) < 0) {
|
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r = -errno;
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goto finish;
|
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}
|
|
|
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k = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for);
|
|
if (k < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
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|
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r = -errno;
|
|
goto finish;
|
|
} else if (k == 0) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
if ((pollfd[POLL_TTY].revents & POLLNVAL) ||
|
|
(notify >= 0 && (pollfd[POLL_INOTIFY].revents & POLLNVAL))) {
|
|
r = -EBADF;
|
|
goto finish;
|
|
}
|
|
|
|
if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0 && keyname) {
|
|
(void) flush_fd(notify);
|
|
|
|
r = ask_password_keyring(keyname, flags, ret);
|
|
if (r >= 0) {
|
|
r = 0;
|
|
goto finish;
|
|
} else if (r != -ENOKEY)
|
|
goto finish;
|
|
}
|
|
|
|
if (pollfd[POLL_TTY].revents == 0)
|
|
continue;
|
|
|
|
n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1);
|
|
if (n < 0) {
|
|
if (IN_SET(errno, EINTR, EAGAIN))
|
|
continue;
|
|
|
|
r = -errno;
|
|
goto finish;
|
|
|
|
}
|
|
|
|
if (press_tab_visible) {
|
|
assert(ttyfd >= 0);
|
|
backspace_chars(ttyfd, strlen(PRESS_TAB));
|
|
press_tab_visible = false;
|
|
}
|
|
|
|
/* We treat EOF, newline and NUL byte all as valid end markers */
|
|
if (n == 0 || c == '\n' || c == 0)
|
|
break;
|
|
|
|
if (c == 4) { /* C-d also known as EOT */
|
|
if (ttyfd >= 0)
|
|
(void) loop_write(ttyfd, SKIPPED, strlen(SKIPPED), false);
|
|
|
|
goto skipped;
|
|
}
|
|
|
|
if (c == 21) { /* C-u */
|
|
|
|
if (!(flags & ASK_PASSWORD_SILENT))
|
|
(void) backspace_string(ttyfd, passphrase);
|
|
|
|
explicit_bzero_safe(passphrase, sizeof(passphrase));
|
|
p = codepoint = 0;
|
|
|
|
} else if (IN_SET(c, '\b', 127)) {
|
|
|
|
if (p > 0) {
|
|
size_t q;
|
|
|
|
if (!(flags & ASK_PASSWORD_SILENT))
|
|
(void) backspace_chars(ttyfd, 1);
|
|
|
|
/* Remove a full UTF-8 codepoint from the end. For that, figure out where the
|
|
* last one begins */
|
|
q = 0;
|
|
for (;;) {
|
|
size_t z;
|
|
|
|
z = utf8_encoded_valid_unichar(passphrase + q, (size_t) -1);
|
|
if (z == 0) {
|
|
q = (size_t) -1; /* Invalid UTF8! */
|
|
break;
|
|
}
|
|
|
|
if (q + z >= p) /* This one brings us over the edge */
|
|
break;
|
|
|
|
q += z;
|
|
}
|
|
|
|
p = codepoint = q == (size_t) -1 ? p - 1 : q;
|
|
explicit_bzero_safe(passphrase + p, sizeof(passphrase) - p);
|
|
|
|
} else if (!dirty && !(flags & ASK_PASSWORD_SILENT)) {
|
|
|
|
flags |= ASK_PASSWORD_SILENT;
|
|
|
|
/* There are two ways to enter silent mode. Either by pressing backspace as
|
|
* first key (and only as first key), or ... */
|
|
|
|
if (ttyfd >= 0)
|
|
(void) loop_write(ttyfd, NO_ECHO, strlen(NO_ECHO), false);
|
|
|
|
} else if (ttyfd >= 0)
|
|
(void) loop_write(ttyfd, "\a", 1, false);
|
|
|
|
} else if (c == '\t' && !(flags & ASK_PASSWORD_SILENT)) {
|
|
|
|
(void) backspace_string(ttyfd, passphrase);
|
|
flags |= ASK_PASSWORD_SILENT;
|
|
|
|
/* ... or by pressing TAB at any time. */
|
|
|
|
if (ttyfd >= 0)
|
|
(void) loop_write(ttyfd, NO_ECHO, strlen(NO_ECHO), false);
|
|
|
|
} else if (p >= sizeof(passphrase)-1) {
|
|
|
|
/* Reached the size limit */
|
|
if (ttyfd >= 0)
|
|
(void) loop_write(ttyfd, "\a", 1, false);
|
|
|
|
} else {
|
|
passphrase[p++] = c;
|
|
|
|
if (!(flags & ASK_PASSWORD_SILENT) && ttyfd >= 0) {
|
|
/* Check if we got a complete UTF-8 character now. If so, let's output one '*'. */
|
|
n = utf8_encoded_valid_unichar(passphrase + codepoint, (size_t) -1);
|
|
if (n >= 0) {
|
|
if (flags & ASK_PASSWORD_ECHO)
|
|
(void) loop_write(ttyfd, passphrase + codepoint, n, false);
|
|
else
|
|
(void) loop_write(ttyfd, "*", 1, false);
|
|
codepoint = p;
|
|
}
|
|
}
|
|
|
|
dirty = true;
|
|
}
|
|
}
|
|
|
|
x = strndup(passphrase, p);
|
|
explicit_bzero_safe(passphrase, sizeof(passphrase));
|
|
if (!x) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
r = strv_consume(&l, x);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
skipped:
|
|
if (strv_isempty(l))
|
|
r = log_debug_errno(SYNTHETIC_ERRNO(ECANCELED), "Password query was cancelled.");
|
|
else {
|
|
if (keyname)
|
|
(void) add_to_keyring_and_log(keyname, flags, l);
|
|
|
|
*ret = TAKE_PTR(l);
|
|
r = 0;
|
|
}
|
|
|
|
finish:
|
|
if (ttyfd >= 0 && reset_tty) {
|
|
(void) loop_write(ttyfd, "\n", 1, false);
|
|
(void) tcsetattr(ttyfd, TCSADRAIN, &old_termios);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int create_socket(char **ret) {
|
|
_cleanup_free_ char *path = NULL;
|
|
union sockaddr_union sa;
|
|
socklen_t sa_len;
|
|
_cleanup_close_ int fd = -1;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
if (asprintf(&path, "/run/systemd/ask-password/sck.%" PRIx64, random_u64()) < 0)
|
|
return -ENOMEM;
|
|
|
|
r = sockaddr_un_set_path(&sa.un, path);
|
|
if (r < 0)
|
|
return r;
|
|
sa_len = r;
|
|
|
|
RUN_WITH_UMASK(0177)
|
|
if (bind(fd, &sa.sa, sa_len) < 0)
|
|
return -errno;
|
|
|
|
r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
*ret = TAKE_PTR(path);
|
|
return TAKE_FD(fd);
|
|
}
|
|
|
|
int ask_password_agent(
|
|
const char *message,
|
|
const char *icon,
|
|
const char *id,
|
|
const char *keyname,
|
|
usec_t until,
|
|
AskPasswordFlags flags,
|
|
char ***ret) {
|
|
|
|
enum {
|
|
FD_SOCKET,
|
|
FD_SIGNAL,
|
|
FD_INOTIFY,
|
|
_FD_MAX
|
|
};
|
|
|
|
_cleanup_close_ int socket_fd = -1, signal_fd = -1, notify = -1, fd = -1;
|
|
char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
|
|
char final[sizeof(temp)] = "";
|
|
_cleanup_free_ char *socket_name = NULL;
|
|
_cleanup_strv_free_erase_ char **l = NULL;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
struct pollfd pollfd[_FD_MAX];
|
|
sigset_t mask, oldmask;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
if (flags & ASK_PASSWORD_NO_AGENT)
|
|
return -EUNATCH;
|
|
|
|
assert_se(sigemptyset(&mask) >= 0);
|
|
assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0);
|
|
assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) >= 0);
|
|
|
|
(void) mkdir_p_label("/run/systemd/ask-password", 0755);
|
|
|
|
if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname) {
|
|
r = ask_password_keyring(keyname, flags, ret);
|
|
if (r >= 0) {
|
|
r = 0;
|
|
goto finish;
|
|
} else if (r != -ENOKEY)
|
|
goto finish;
|
|
|
|
notify = inotify_init1(IN_CLOEXEC | IN_NONBLOCK);
|
|
if (notify < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_ATTRIB /* for mtime */) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
fd = mkostemp_safe(temp);
|
|
if (fd < 0) {
|
|
r = fd;
|
|
goto finish;
|
|
}
|
|
|
|
(void) fchmod(fd, 0644);
|
|
|
|
f = take_fdopen(&fd, "w");
|
|
if (!f) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
|
|
if (signal_fd < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
socket_fd = create_socket(&socket_name);
|
|
if (socket_fd < 0) {
|
|
r = socket_fd;
|
|
goto finish;
|
|
}
|
|
|
|
fprintf(f,
|
|
"[Ask]\n"
|
|
"PID="PID_FMT"\n"
|
|
"Socket=%s\n"
|
|
"AcceptCached=%i\n"
|
|
"Echo=%i\n"
|
|
"NotAfter="USEC_FMT"\n",
|
|
getpid_cached(),
|
|
socket_name,
|
|
(flags & ASK_PASSWORD_ACCEPT_CACHED) ? 1 : 0,
|
|
(flags & ASK_PASSWORD_ECHO) ? 1 : 0,
|
|
until);
|
|
|
|
if (message)
|
|
fprintf(f, "Message=%s\n", message);
|
|
|
|
if (icon)
|
|
fprintf(f, "Icon=%s\n", icon);
|
|
|
|
if (id)
|
|
fprintf(f, "Id=%s\n", id);
|
|
|
|
r = fflush_and_check(f);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
memcpy(final, temp, sizeof(temp));
|
|
|
|
final[sizeof(final)-11] = 'a';
|
|
final[sizeof(final)-10] = 's';
|
|
final[sizeof(final)-9] = 'k';
|
|
|
|
if (rename(temp, final) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
zero(pollfd);
|
|
pollfd[FD_SOCKET].fd = socket_fd;
|
|
pollfd[FD_SOCKET].events = POLLIN;
|
|
pollfd[FD_SIGNAL].fd = signal_fd;
|
|
pollfd[FD_SIGNAL].events = POLLIN;
|
|
pollfd[FD_INOTIFY].fd = notify;
|
|
pollfd[FD_INOTIFY].events = POLLIN;
|
|
|
|
for (;;) {
|
|
CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control;
|
|
char passphrase[LINE_MAX+1];
|
|
struct iovec iovec;
|
|
struct ucred *ucred;
|
|
ssize_t n;
|
|
int k;
|
|
usec_t t;
|
|
|
|
t = now(CLOCK_MONOTONIC);
|
|
|
|
if (until > 0 && until <= t) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
k = poll(pollfd, notify >= 0 ? _FD_MAX : _FD_MAX - 1, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1);
|
|
if (k < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
if (k <= 0) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
if (pollfd[FD_SOCKET].revents & POLLNVAL ||
|
|
pollfd[FD_SIGNAL].revents & POLLNVAL ||
|
|
(notify >= 0 && pollfd[FD_INOTIFY].revents & POLLNVAL)) {
|
|
r = -EBADF;
|
|
goto finish;
|
|
}
|
|
|
|
if (pollfd[FD_SIGNAL].revents & POLLIN) {
|
|
r = -EINTR;
|
|
goto finish;
|
|
}
|
|
|
|
if (notify >= 0 && pollfd[FD_INOTIFY].revents != 0) {
|
|
(void) flush_fd(notify);
|
|
|
|
r = ask_password_keyring(keyname, flags, ret);
|
|
if (r >= 0) {
|
|
r = 0;
|
|
goto finish;
|
|
} else if (r != -ENOKEY)
|
|
goto finish;
|
|
}
|
|
|
|
if (pollfd[FD_SOCKET].revents == 0)
|
|
continue;
|
|
|
|
if (pollfd[FD_SOCKET].revents != POLLIN) {
|
|
r = -EIO;
|
|
goto finish;
|
|
}
|
|
|
|
iovec = IOVEC_MAKE(passphrase, sizeof(passphrase));
|
|
|
|
struct msghdr msghdr = {
|
|
.msg_iov = &iovec,
|
|
.msg_iovlen = 1,
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
|
|
n = recvmsg_safe(socket_fd, &msghdr, 0);
|
|
if (IN_SET(n, -EAGAIN, -EINTR))
|
|
continue;
|
|
if (n < 0) {
|
|
r = (int) n;
|
|
goto finish;
|
|
}
|
|
|
|
cmsg_close_all(&msghdr);
|
|
|
|
if (n <= 0) {
|
|
log_debug("Message too short");
|
|
continue;
|
|
}
|
|
|
|
ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred);
|
|
if (!ucred) {
|
|
log_debug("Received message without credentials. Ignoring.");
|
|
continue;
|
|
}
|
|
|
|
if (ucred->uid != 0) {
|
|
log_debug("Got request from unprivileged user. Ignoring.");
|
|
continue;
|
|
}
|
|
|
|
if (passphrase[0] == '+') {
|
|
/* An empty message refers to the empty password */
|
|
if (n == 1)
|
|
l = strv_new("");
|
|
else
|
|
l = strv_parse_nulstr(passphrase+1, n-1);
|
|
explicit_bzero_safe(passphrase, n);
|
|
if (!l) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
if (strv_isempty(l)) {
|
|
l = strv_free(l);
|
|
log_debug("Invalid packet");
|
|
continue;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if (passphrase[0] == '-') {
|
|
r = -ECANCELED;
|
|
goto finish;
|
|
}
|
|
|
|
log_debug("Invalid packet");
|
|
}
|
|
|
|
if (keyname)
|
|
(void) add_to_keyring_and_log(keyname, flags, l);
|
|
|
|
*ret = TAKE_PTR(l);
|
|
r = 0;
|
|
|
|
finish:
|
|
if (socket_name)
|
|
(void) unlink(socket_name);
|
|
|
|
(void) unlink(temp);
|
|
|
|
if (final[0])
|
|
(void) unlink(final);
|
|
|
|
assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
|
|
return r;
|
|
}
|
|
|
|
int ask_password_auto(
|
|
const char *message,
|
|
const char *icon,
|
|
const char *id,
|
|
const char *keyname,
|
|
usec_t until,
|
|
AskPasswordFlags flags,
|
|
char ***ret) {
|
|
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
if ((flags & ASK_PASSWORD_ACCEPT_CACHED) &&
|
|
keyname &&
|
|
((flags & ASK_PASSWORD_NO_TTY) || !isatty(STDIN_FILENO)) &&
|
|
(flags & ASK_PASSWORD_NO_AGENT)) {
|
|
r = ask_password_keyring(keyname, flags, ret);
|
|
if (r != -ENOKEY)
|
|
return r;
|
|
}
|
|
|
|
if (!(flags & ASK_PASSWORD_NO_TTY) && isatty(STDIN_FILENO))
|
|
return ask_password_tty(-1, message, keyname, until, flags, NULL, ret);
|
|
|
|
if (!(flags & ASK_PASSWORD_NO_AGENT))
|
|
return ask_password_agent(message, icon, id, keyname, until, flags, ret);
|
|
|
|
return -EUNATCH;
|
|
}
|