src/shared/ask-password-api.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <inttypes.h>
   6 #include <limits.h>
   7 #include <poll.h>
   8 #include <signal.h>
   9 #include <stdbool.h>
  10 #include <stddef.h>
  11 #include <stdint.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <sys/inotify.h>
  16 #include <sys/signalfd.h>
  17 #include <sys/socket.h>
  18 #include <sys/stat.h>
  19 #include <sys/time.h>
  20 #include <sys/uio.h>
  21 #include <sys/un.h>
  22 #include <termios.h>
  23 #include <unistd.h>
  24
  25 #include "alloc-util.h"
  26 #include "ask-password-api.h"
  27 #include "fd-util.h"
  28 #include "fileio.h"
  29 #include "format-util.h"
  30 #include "io-util.h"
  31 #include "log.h"
  32 #include "macro.h"
  33 #include "missing.h"
  34 #include "mkdir.h"
  35 #include "process-util.h"
  36 #include "random-util.h"
  37 #include "signal-util.h"
  38 #include "socket-util.h"
  39 #include "string-util.h"
  40 #include "strv.h"
  41 #include "terminal-util.h"
  42 #include "time-util.h"
  43 #include "umask-util.h"
  44 #include "utf8.h"
  45 #include "util.h"
  46
  47 #define KEYRING_TIMEOUT_USEC ((5 * USEC_PER_MINUTE) / 2)
  48
  49 static int lookup_key(const char *keyname, key_serial_t *ret) {
  50         key_serial_t serial;
  51
  52         assert(keyname);
  53         assert(ret);
  54
  55         serial = request_key("user", keyname, NULL, 0);
  56         if (serial == -1)
  57                 return negative_errno();
  58
  59         *ret = serial;
  60         return 0;
  61 }
  62
  63 static int retrieve_key(key_serial_t serial, char ***ret) {
  64         _cleanup_free_ char *p = NULL;
  65         long m = 100, n;
  66         char **l;
  67
  68         assert(ret);
  69
  70         for (;;) {
  71                 p = new(char, m);
  72                 if (!p)
  73                         return -ENOMEM;
  74
  75                 n = keyctl(KEYCTL_READ, (unsigned long) serial, (unsigned long) p, (unsigned long) m, 0);
  76                 if (n < 0)
  77                         return -errno;
  78
  79                 if (n < m)
  80                         break;
  81
  82                 explicit_bzero(p, n);
  83                 free(p);
  84                 m *= 2;
  85         }
  86
  87         l = strv_parse_nulstr(p, n);
  88         if (!l)
  89                 return -ENOMEM;
  90
  91         explicit_bzero(p, n);
  92
  93         *ret = l;
  94         return 0;
  95 }
  96
  97 static int add_to_keyring(const char *keyname, AskPasswordFlags flags, char **passwords) {
  98         _cleanup_strv_free_erase_ char **l = NULL;
  99         _cleanup_free_ char *p = NULL;
 100         key_serial_t serial;
 101         size_t n;
 102         int r;
 103
 104         assert(keyname);
 105         assert(passwords);
 106
 107         if (!(flags & ASK_PASSWORD_PUSH_CACHE))
 108                 return 0;
 109
 110         r = lookup_key(keyname, &serial);
 111         if (r >= 0) {
 112                 r = retrieve_key(serial, &l);
 113                 if (r < 0)
 114                         return r;
 115         } else if (r != -ENOKEY)
 116                 return r;
 117
 118         r = strv_extend_strv(&l, passwords, true);
 119         if (r <= 0)
 120                 return r;
 121
 122         r = strv_make_nulstr(l, &p, &n);
 123         if (r < 0)
 124                 return r;
 125
 126         serial = add_key("user", keyname, p, n, KEY_SPEC_USER_KEYRING);
 127         explicit_bzero(p, n);
 128         if (serial == -1)
 129                 return -errno;
 130
 131         if (keyctl(KEYCTL_SET_TIMEOUT,
 132                    (unsigned long) serial,
 133                    (unsigned long) DIV_ROUND_UP(KEYRING_TIMEOUT_USEC, USEC_PER_SEC), 0, 0) < 0)
 134                 log_debug_errno(errno, "Failed to adjust timeout: %m");
 135
 136         log_debug("Added key to keyring as %" PRIi32 ".", serial);
 137
 138         return 1;
 139 }
 140
 141 static int add_to_keyring_and_log(const char *keyname, AskPasswordFlags flags, char **passwords) {
 142         int r;
 143
 144         assert(keyname);
 145         assert(passwords);
 146
 147         r = add_to_keyring(keyname, flags, passwords);
 148         if (r < 0)
 149                 return log_debug_errno(r, "Failed to add password to keyring: %m");
 150
 151         return 0;
 152 }
 153
 154 int ask_password_keyring(const char *keyname, AskPasswordFlags flags, char ***ret) {
 155
 156         key_serial_t serial;
 157         int r;
 158
 159         assert(keyname);
 160         assert(ret);
 161
 162         if (!(flags & ASK_PASSWORD_ACCEPT_CACHED))
 163                 return -EUNATCH;
 164
 165         r = lookup_key(keyname, &serial);
 166         if (r == -ENOSYS) /* when retrieving the distinction doesn't matter */
 167                 return -ENOKEY;
 168         if (r < 0)
 169                 return r;
 170
 171         return retrieve_key(serial, ret);
 172 }
 173
 174 static void backspace_chars(int ttyfd, size_t p) {
 175
 176         if (ttyfd < 0)
 177                 return;
 178
 179         while (p > 0) {
 180                 p--;
 181
 182                 loop_write(ttyfd, "\b \b", 3, false);
 183         }
 184 }
 185
 186 static void backspace_string(int ttyfd, const char *str) {
 187         size_t m;
 188
 189         assert(str);
 190
 191         if (ttyfd < 0)
 192                 return;
 193
 194         /* Backspaces through enough characters to entirely undo printing of the specified string. */
 195
 196         m = utf8_n_codepoints(str);
 197         if (m == (size_t) -1)
 198                 m = strlen(str); /* Not a valid UTF-8 string? If so, let's backspace the number of bytes output. Most
 199                                   * likely this happened because we are not in an UTF-8 locale, and in that case that
 200                                   * is the correct thing to do. And even if it's not, terminals tend to stop
 201                                   * backspacing at the leftmost column, hence backspacing too much should be mostly
 202                                   * OK. */
 203
 204         backspace_chars(ttyfd, m);
 205 }
 206
 207 int ask_password_tty(
 208                 int ttyfd,
 209                 const char *message,
 210                 const char *keyname,
 211                 usec_t until,
 212                 AskPasswordFlags flags,
 213                 const char *flag_file,
 214                 char **ret) {
 215
 216         enum {
 217                 POLL_TTY,
 218                 POLL_INOTIFY,
 219                 _POLL_MAX,
 220         };
 221
 222         bool reset_tty = false, dirty = false, use_color = false;
 223         _cleanup_close_ int cttyfd = -1, notify = -1;
 224         struct termios old_termios, new_termios;
 225         char passphrase[LINE_MAX + 1] = {}, *x;
 226         struct pollfd pollfd[_POLL_MAX];
 227         size_t p = 0, codepoint = 0;
 228         int r;
 229
 230         assert(ret);
 231
 232         if (flags & ASK_PASSWORD_NO_TTY)
 233                 return -EUNATCH;
 234
 235         if (!message)
 236                 message = "Password:";
 237
 238         if (flag_file) {
 239                 notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
 240                 if (notify < 0)
 241                         return -errno;
 242
 243                 if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0)
 244                         return -errno;
 245         }
 246
 247         /* If the caller didn't specify a TTY, then use the controlling tty, if we can. */
 248         if (ttyfd < 0)
 249                 ttyfd = cttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC);
 250
 251         if (ttyfd >= 0) {
 252                 if (tcgetattr(ttyfd, &old_termios) < 0)
 253                         return -errno;
 254
 255                 if (flags & ASK_PASSWORD_CONSOLE_COLOR)
 256                         use_color = dev_console_colors_enabled();
 257                 else
 258                         use_color = colors_enabled();
 259
 260                 if (use_color)
 261                         (void) loop_write(ttyfd, ANSI_HIGHLIGHT, STRLEN(ANSI_HIGHLIGHT), false);
 262
 263                 (void) loop_write(ttyfd, message, strlen(message), false);
 264                 (void) loop_write(ttyfd, " ", 1, false);
 265
 266                 if (use_color)
 267                         (void) loop_write(ttyfd, ANSI_NORMAL, STRLEN(ANSI_NORMAL), false);
 268
 269                 new_termios = old_termios;
 270                 new_termios.c_lflag &= ~(ICANON|ECHO);
 271                 new_termios.c_cc[VMIN] = 1;
 272                 new_termios.c_cc[VTIME] = 0;
 273
 274                 if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
 275                         r = -errno;
 276                         goto finish;
 277                 }
 278
 279                 reset_tty = true;
 280         }
 281
 282         pollfd[POLL_TTY] = (struct pollfd) {
 283                 .fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO,
 284                 .events = POLLIN,
 285         };
 286         pollfd[POLL_INOTIFY] = (struct pollfd) {
 287                 .fd = notify,
 288                 .events = POLLIN,
 289         };
 290
 291         for (;;) {
 292                 int sleep_for = -1, k;
 293                 ssize_t n;
 294                 char c;
 295
 296                 if (until > 0) {
 297                         usec_t y;
 298
 299                         y = now(CLOCK_MONOTONIC);
 300
 301                         if (y > until) {
 302                                 r = -ETIME;
 303                                 goto finish;
 304                         }
 305
 306                         sleep_for = (int) DIV_ROUND_UP(until - y, USEC_PER_MSEC);
 307                 }
 308
 309                 if (flag_file)
 310                         if (access(flag_file, F_OK) < 0) {
 311                                 r = -errno;
 312                                 goto finish;
 313                         }
 314
 315                 k = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for);
 316                 if (k < 0) {
 317                         if (errno == EINTR)
 318                                 continue;
 319
 320                         r = -errno;
 321                         goto finish;
 322                 } else if (k == 0) {
 323                         r = -ETIME;
 324                         goto finish;
 325                 }
 326
 327                 if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0)
 328                         (void) flush_fd(notify);
 329
 330                 if (pollfd[POLL_TTY].revents == 0)
 331                         continue;
 332
 333                 n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1);
 334                 if (n < 0) {
 335                         if (IN_SET(errno, EINTR, EAGAIN))
 336                                 continue;
 337
 338                         r = -errno;
 339                         goto finish;
 340
 341                 }
 342
 343                 /* We treat EOF, newline and NUL byte all as valid end markers */
 344                 if (n == 0 || c == '\n' || c == 0)
 345                         break;
 346
 347                 if (c == 21) { /* C-u */
 348
 349                         if (!(flags & ASK_PASSWORD_SILENT))
 350                                 backspace_string(ttyfd, passphrase);
 351
 352                         explicit_bzero(passphrase, sizeof(passphrase));
 353                         p = codepoint = 0;
 354
 355                 } else if (IN_SET(c, '\b', 127)) {
 356
 357                         if (p > 0) {
 358                                 size_t q;
 359
 360                                 if (!(flags & ASK_PASSWORD_SILENT))
 361                                         backspace_chars(ttyfd, 1);
 362
 363                                 /* Remove a full UTF-8 codepoint from the end. For that, figure out where the last one
 364                                  * begins */
 365                                 q = 0;
 366                                 for (;;) {
 367                                         size_t z;
 368
 369                                         z = utf8_encoded_valid_unichar(passphrase + q);
 370                                         if (z == 0) {
 371                                                 q = (size_t) -1; /* Invalid UTF8! */
 372                                                 break;
 373                                         }
 374
 375                                         if (q + z >= p) /* This one brings us over the edge */
 376                                                 break;
 377
 378                                         q += z;
 379                                 }
 380
 381                                 p = codepoint = q == (size_t) -1 ? p - 1 : q;
 382                                 explicit_bzero(passphrase + p, sizeof(passphrase) - p);
 383
 384                         } else if (!dirty && !(flags & ASK_PASSWORD_SILENT)) {
 385
 386                                 flags |= ASK_PASSWORD_SILENT;
 387
 388                                 /* There are two ways to enter silent mode. Either by pressing backspace as first key
 389                                  * (and only as first key), or ... */
 390
 391                                 if (ttyfd >= 0)
 392                                         (void) loop_write(ttyfd, "(no echo) ", 10, false);
 393
 394                         } else if (ttyfd >= 0)
 395                                 (void) loop_write(ttyfd, "\a", 1, false);
 396
 397                 } else if (c == '\t' && !(flags & ASK_PASSWORD_SILENT)) {
 398
 399                         backspace_string(ttyfd, passphrase);
 400                         flags |= ASK_PASSWORD_SILENT;
 401
 402                         /* ... or by pressing TAB at any time. */
 403
 404                         if (ttyfd >= 0)
 405                                 (void) loop_write(ttyfd, "(no echo) ", 10, false);
 406
 407                 } else if (p >= sizeof(passphrase)-1) {
 408
 409                         /* Reached the size limit */
 410                         if (ttyfd >= 0)
 411                                 (void) loop_write(ttyfd, "\a", 1, false);
 412
 413                 } else {
 414                         passphrase[p++] = c;
 415
 416                         if (!(flags & ASK_PASSWORD_SILENT) && ttyfd >= 0) {
 417                                 /* Check if we got a complete UTF-8 character now. If so, let's output one '*'. */
 418                                 n = utf8_encoded_valid_unichar(passphrase + codepoint);
 419                                 if (n >= 0) {
 420                                         codepoint = p;
 421                                         (void) loop_write(ttyfd, (flags & ASK_PASSWORD_ECHO) ? &c : "*", 1, false);
 422                                 }
 423                         }
 424
 425                         dirty = true;
 426                 }
 427
 428                 /* Let's forget this char, just to not keep needlessly copies of key material around */
 429                 c = 'x';
 430         }
 431
 432         x = strndup(passphrase, p);
 433         explicit_bzero(passphrase, sizeof(passphrase));
 434         if (!x) {
 435                 r = -ENOMEM;
 436                 goto finish;
 437         }
 438
 439         if (keyname)
 440                 (void) add_to_keyring_and_log(keyname, flags, STRV_MAKE(x));
 441
 442         *ret = x;
 443         r = 0;
 444
 445 finish:
 446         if (ttyfd >= 0 && reset_tty) {
 447                 (void) loop_write(ttyfd, "\n", 1, false);
 448                 (void) tcsetattr(ttyfd, TCSADRAIN, &old_termios);
 449         }
 450
 451         return r;
 452 }
 453
 454 static int create_socket(char **name) {
 455         union sockaddr_union sa = {
 456                 .un.sun_family = AF_UNIX,
 457         };
 458         _cleanup_close_ int fd = -1;
 459         static const int one = 1;
 460         char *c;
 461         int r;
 462
 463         assert(name);
 464
 465         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 466         if (fd < 0)
 467                 return -errno;
 468
 469         snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%" PRIx64, random_u64());
 470
 471         RUN_WITH_UMASK(0177) {
 472                 if (bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
 473                         return -errno;
 474         }
 475
 476         if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
 477                 return -errno;
 478
 479         c = strdup(sa.un.sun_path);
 480         if (!c)
 481                 return -ENOMEM;
 482
 483         *name = c;
 484
 485         r = fd;
 486         fd = -1;
 487
 488         return r;
 489 }
 490
 491 int ask_password_agent(
 492                 const char *message,
 493                 const char *icon,
 494                 const char *id,
 495                 const char *keyname,
 496                 usec_t until,
 497                 AskPasswordFlags flags,
 498                 char ***ret) {
 499
 500         enum {
 501                 FD_SOCKET,
 502                 FD_SIGNAL,
 503                 _FD_MAX
 504         };
 505
 506         _cleanup_close_ int socket_fd = -1, signal_fd = -1, fd = -1;
 507         char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
 508         char final[sizeof(temp)] = "";
 509         _cleanup_free_ char *socket_name = NULL;
 510         _cleanup_strv_free_ char **l = NULL;
 511         _cleanup_fclose_ FILE *f = NULL;
 512         struct pollfd pollfd[_FD_MAX];
 513         sigset_t mask, oldmask;
 514         int r;
 515
 516         assert(ret);
 517
 518         if (flags & ASK_PASSWORD_NO_AGENT)
 519                 return -EUNATCH;
 520
 521         assert_se(sigemptyset(&mask) >= 0);
 522         assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0);
 523         assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) >= 0);
 524
 525         (void) mkdir_p_label("/run/systemd/ask-password", 0755);
 526
 527         fd = mkostemp_safe(temp);
 528         if (fd < 0) {
 529                 r = fd;
 530                 goto finish;
 531         }
 532
 533         (void) fchmod(fd, 0644);
 534
 535         f = fdopen(fd, "w");
 536         if (!f) {
 537                 r = -errno;
 538                 goto finish;
 539         }
 540
 541         fd = -1;
 542
 543         signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
 544         if (signal_fd < 0) {
 545                 r = -errno;
 546                 goto finish;
 547         }
 548
 549         socket_fd = create_socket(&socket_name);
 550         if (socket_fd < 0) {
 551                 r = socket_fd;
 552                 goto finish;
 553         }
 554
 555         fprintf(f,
 556                 "[Ask]\n"
 557                 "PID="PID_FMT"\n"
 558                 "Socket=%s\n"
 559                 "AcceptCached=%i\n"
 560                 "Echo=%i\n"
 561                 "NotAfter="USEC_FMT"\n",
 562                 getpid_cached(),
 563                 socket_name,
 564                 (flags & ASK_PASSWORD_ACCEPT_CACHED) ? 1 : 0,
 565                 (flags & ASK_PASSWORD_ECHO) ? 1 : 0,
 566                 until);
 567
 568         if (message)
 569                 fprintf(f, "Message=%s\n", message);
 570
 571         if (icon)
 572                 fprintf(f, "Icon=%s\n", icon);
 573
 574         if (id)
 575                 fprintf(f, "Id=%s\n", id);
 576
 577         r = fflush_and_check(f);
 578         if (r < 0)
 579                 goto finish;
 580
 581         memcpy(final, temp, sizeof(temp));
 582
 583         final[sizeof(final)-11] = 'a';
 584         final[sizeof(final)-10] = 's';
 585         final[sizeof(final)-9] = 'k';
 586
 587         if (rename(temp, final) < 0) {
 588                 r = -errno;
 589                 goto finish;
 590         }
 591
 592         zero(pollfd);
 593         pollfd[FD_SOCKET].fd = socket_fd;
 594         pollfd[FD_SOCKET].events = POLLIN;
 595         pollfd[FD_SIGNAL].fd = signal_fd;
 596         pollfd[FD_SIGNAL].events = POLLIN;
 597
 598         for (;;) {
 599                 char passphrase[LINE_MAX+1];
 600                 struct msghdr msghdr;
 601                 struct iovec iovec;
 602                 struct ucred *ucred;
 603                 union {
 604                         struct cmsghdr cmsghdr;
 605                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
 606                 } control;
 607                 ssize_t n;
 608                 int k;
 609                 usec_t t;
 610
 611                 t = now(CLOCK_MONOTONIC);
 612
 613                 if (until > 0 && until <= t) {
 614                         r = -ETIME;
 615                         goto finish;
 616                 }
 617
 618                 k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1);
 619                 if (k < 0) {
 620                         if (errno == EINTR)
 621                                 continue;
 622
 623                         r = -errno;
 624                         goto finish;
 625                 }
 626
 627                 if (k <= 0) {
 628                         r = -ETIME;
 629                         goto finish;
 630                 }
 631
 632                 if (pollfd[FD_SIGNAL].revents & POLLIN) {
 633                         r = -EINTR;
 634                         goto finish;
 635                 }
 636
 637                 if (pollfd[FD_SOCKET].revents != POLLIN) {
 638                         r = -EIO;
 639                         goto finish;
 640                 }
 641
 642                 zero(iovec);
 643                 iovec.iov_base = passphrase;
 644                 iovec.iov_len = sizeof(passphrase);
 645
 646                 zero(control);
 647                 zero(msghdr);
 648                 msghdr.msg_iov = &iovec;
 649                 msghdr.msg_iovlen = 1;
 650                 msghdr.msg_control = &control;
 651                 msghdr.msg_controllen = sizeof(control);
 652
 653                 n = recvmsg(socket_fd, &msghdr, 0);
 654                 if (n < 0) {
 655                         if (IN_SET(errno, EAGAIN, EINTR))
 656                                 continue;
 657
 658                         r = -errno;
 659                         goto finish;
 660                 }
 661
 662                 cmsg_close_all(&msghdr);
 663
 664                 if (n <= 0) {
 665                         log_debug("Message too short");
 666                         continue;
 667                 }
 668
 669                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
 670                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
 671                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
 672                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
 673                         log_debug("Received message without credentials. Ignoring.");
 674                         continue;
 675                 }
 676
 677                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
 678                 if (ucred->uid != 0) {
 679                         log_debug("Got request from unprivileged user. Ignoring.");
 680                         continue;
 681                 }
 682
 683                 if (passphrase[0] == '+') {
 684                         /* An empty message refers to the empty password */
 685                         if (n == 1)
 686                                 l = strv_new("", NULL);
 687                         else
 688                                 l = strv_parse_nulstr(passphrase+1, n-1);
 689                         explicit_bzero(passphrase, n);
 690                         if (!l) {
 691                                 r = -ENOMEM;
 692                                 goto finish;
 693                         }
 694
 695                         if (strv_isempty(l)) {
 696                                 l = strv_free(l);
 697                                 log_debug("Invalid packet");
 698                                 continue;
 699                         }
 700
 701                         break;
 702                 }
 703
 704                 if (passphrase[0] == '-') {
 705                         r = -ECANCELED;
 706                         goto finish;
 707                 }
 708
 709                 log_debug("Invalid packet");
 710         }
 711
 712         if (keyname)
 713                 (void) add_to_keyring_and_log(keyname, flags, l);
 714
 715         *ret = TAKE_PTR(l);
 716         r = 0;
 717
 718 finish:
 719         if (socket_name)
 720                 (void) unlink(socket_name);
 721
 722         (void) unlink(temp);
 723
 724         if (final[0])
 725                 (void) unlink(final);
 726
 727         assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
 728         return r;
 729 }
 730
 731 int ask_password_auto(
 732                 const char *message,
 733                 const char *icon,
 734                 const char *id,
 735                 const char *keyname,
 736                 usec_t until,
 737                 AskPasswordFlags flags,
 738                 char ***ret) {
 739
 740         int r;
 741
 742         assert(ret);
 743
 744         if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname) {
 745                 r = ask_password_keyring(keyname, flags, ret);
 746                 if (r != -ENOKEY)
 747                         return r;
 748         }
 749
 750         if (!(flags & ASK_PASSWORD_NO_TTY) && isatty(STDIN_FILENO)) {
 751                 char *s = NULL, **l = NULL;
 752
 753                 r = ask_password_tty(-1, message, keyname, until, flags, NULL, &s);
 754                 if (r < 0)
 755                         return r;
 756
 757                 r = strv_push(&l, s);
 758                 if (r < 0) {
 759                         string_erase(s);
 760                         free(s);
 761                         return -ENOMEM;
 762                 }
 763
 764                 *ret = l;
 765                 return 0;
 766         }
 767
 768         if (!(flags & ASK_PASSWORD_NO_AGENT))
 769                 return ask_password_agent(message, icon, id, keyname, until, flags, ret);
 770
 771         return -EUNATCH;
 772 }