├── LICENSE ├── Makefile ├── README.md ├── passh.c └── sshpass-broken.md /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | 2 | all: passh 3 | 4 | passh: passh.c 5 | 6 | clean: 7 | -rm passh 8 | 9 | .PHONY: all clean 10 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # passh 2 | 3 | **NOTE:** The pty related code is stolen from the [APUE book][apue]. 4 | 5 | [apue]: http://www.apuebook.com/ 6 | 7 | ## compile 8 | 9 | $ cc -o passh passh.c 10 | $ cp -v passh /usr/bin/ 11 | $ passh -h 12 | 13 | ## usage 14 | 15 | ``` 16 | Usage: passh [OPTION]... COMMAND... 17 | 18 | -c Send at most passwords (0 means infinite. Default: 0) 19 | -C Exit if prompted for the th password 20 | -h Help 21 | -i Case insensitive for password prompt matching 22 | -n Nohup the child (e.g. used for `ssh -f') 23 | -p The password (Default: `password') 24 | -p env: Read password from env var 25 | -p file: Read password from file 26 | -p sock: Read password from UNIX socket 27 | -P Regexp (BRE) for the password prompt 28 | (Default: `[Pp]assword: \{0,1\}$') 29 | -l Save data written to the pty 30 | -L Save data read from the pty 31 | -t Timeout waiting for next password prompt 32 | (0 means no timeout. Default: 0) 33 | -T Exit if timed out waiting for password prompt 34 | -V Show version 35 | -y Auto answer `(yes/no)?' questions 36 | 37 | Report bugs to Clark Wang 38 | ``` 39 | 40 | ## supported platforms 41 | 42 | Tested on: 43 | 44 | * OpenWRT 15.05.1, ramips/mt7620 (on [Newifi Mini, or Lenovo Y1 v1][newifi]) 45 | * Debian Linux 8, x86_64 (Jessie) 46 | * macOS 10.12 (Sierra) 47 | * Cygwin, x86_64 (on Windows 7) 48 | * FreeBSD 11.1, x86_64 49 | * AIX 7.2, ppc64le (added in [issue #7](https://github.com/clarkwang/passh/issues/7)) 50 | 51 | [newifi]: https://wiki.openwrt.org/toh/lenovo/lenovo_y1_v1 52 | 53 | ## why i wrote passh 54 | 55 | 1. I got a `Newifi Mini` router and installed `OpenWRT` on it. I want the router to be my `SOCKS` proxy so I run `ssh -D 8888 user@host` automatically at boot time but the SSH server only supports password auth. On Linux I would use `Expect` to automate `ssh` but `OpenWRT` does not install `Expect` by default and my router does not have enough storage for the extra `Tcl` and `Expect` packages. 56 | 57 | 1. Then I tried [`sshpass`][sshpass] but `sshpass` seems more like a nice hack and it's *broken* by design. See following example on a Linux system: 58 | 59 | $ tty 60 | /dev/pts/18 // now we're on pts/18 61 | $ sshpass bash --norc 62 | bash: cannot set terminal process group (-1): Inappropriate ioctl for device 63 | bash: no job control in this shell 64 | bash-4.4# tty 65 | /dev/pts/18 // the bash's stdin is also connected to pts/18 66 | bash-4.4# ps p $$ 67 | PID TTY STAT TIME COMMAND 68 | 37151 pts/36 Ss+ 0:00 bash --norc // but the controlling terminal is pts/36 69 | bash-4.4# ps t pts/36 70 | PID TTY STAT TIME COMMAND 71 | 37151 pts/36 Ss+ 0:00 bash --norc 72 | 37154 pts/36 R+ 0:00 ps t pts/36 73 | bash-4.4# 74 | 75 | Now let's try `passh`: 76 | 77 | $ tty 78 | /dev/pts/18 // now we're on pts/18 79 | $ passh bash --norc 80 | bash-4.4# tty 81 | /dev/pts/36 // the bash's stdin is connected to the new pts/36 82 | bash-4.4# ps p $$ 83 | PID TTY STAT TIME COMMAND 84 | 37159 pts/36 Ss 0:00 bash --norc // pts/36 is its controlling terminal 85 | bash-4.4# ps t pts/36 86 | PID TTY STAT TIME COMMAND 87 | 37159 pts/36 Ss 0:00 bash --norc 88 | 37162 pts/36 R+ 0:00 ps t pts/36 89 | bash-4.4# 90 | 91 | See [sshpass-broken.md](sshpass-broken.md) for more *sshpass is broken* examples. 92 | 93 | [sshpass]: https://sourceforge.net/projects/sshpass/ 94 | 95 | ## auto answer questions 96 | 97 | You can use `passh` for more than just inputting the passwords. For example, you could use this to both enter the password and answer yes to the question `Proceed with propagating updates` with the `unison` bidirecional sync tool: 98 | 1. `passh -P 'Proceed with propagating updates' -p y passh -P '[Pp]assword: \{0,1\}$' -p password unison ...` 99 | 100 | `unison` has the builtin option called `-batch` to answer yes to this question `Proceed with propagating updates`, however that option also implies to ignore conflicts and fail silently. Then, using `passh` to answer `y` to the input question `Proceed with propagating updates` allows you to automate the process when there is no conflicts, because when there are conflicts the first question would be to chose which file should be synced. 101 | 102 | ## examples 103 | 104 | 1. `sshpass` is *better* in its own way. 105 | 106 | For example, you can use `rsync` + `sshpass` like this: 107 | 108 | $ rsync -e 'sshpass -p password ssh' file user@host:/dir 109 | 110 | But with `passh` you have to: 111 | 112 | $ passh -p password rsync -e ssh file user@host:/dir 113 | 114 | Another example, with `sshpass` you can: 115 | 116 | $ echo date | sshpass -p password ssh user@host bash 117 | 118 | But with `passh` you have to: 119 | 120 | $ passh -p password bash -c 'echo date | ssh user@host bash' 121 | 122 | 1. Start SSH SOCKS proxy in background 123 | 124 | $ passh -n -p password ssh -D 7070 -N -n -f user@host 125 | 126 | Here `-n` is required or `ssh -f` would not work. (I believe the bug is in OpenSSH though.) 127 | 128 | 1. Login to a remote server 129 | 130 | $ passh -p password ssh user@host 131 | 132 | 1. Run a command on remote server 133 | 134 | $ passh -p password ssh user@host date 135 | 136 | 1. Share a remote server with others and want to use your local `bashrc`? 137 | 138 | $ passh -p password scp /local/bashrc user@host:/tmp/tmp.cAE8Kv 139 | $ passh -p password ssh -t user@host bash --rc /tmp/tmp.cAE8Kv 140 | 141 | 1. Or just for fun 142 | 143 | $ passh bash 144 | $ passh vim 145 | -------------------------------------------------------------------------------- /passh.c: -------------------------------------------------------------------------------- 1 | /* passh - automate ssh password authentication 2 | Copyright (C) 2017-2020 Clark Wang 3 | 4 | This program is free software: you can redistribute it and/or modify 5 | it under the terms of the GNU General Public License as published by 6 | the Free Software Foundation, either version 3 of the License, or 7 | (at your option) any later version. 8 | 9 | This program is distributed in the hope that it will be useful, 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | GNU General Public License for more details. 13 | 14 | You should have received a copy of the GNU General Public License 15 | along with this program. If not, see . 16 | */ 17 | 18 | /* 19 | * NOTE: 20 | * - Interactive only when stdin is a tty. 21 | * - In interactive mode, will not send passwords any more after user starts 22 | * inputting from the keyboard. 23 | */ 24 | 25 | /* 26 | * - On OS X EI Capitan (10.11.6), definging _XOPEN_SOURCE=600 would cause 27 | * SIGWINCH to be undefined. 28 | */ 29 | #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(_AIX) 30 | #define _XOPEN_SOURCE 600 /* for posix_openpt() */ 31 | #endif 32 | 33 | #include 34 | #include 35 | #include 36 | #include 37 | #include 38 | #include 39 | #include 40 | #include 41 | #include 42 | #include 43 | #include 44 | #include 45 | #include 46 | #include 47 | #include 48 | #include 49 | #include 50 | #include 51 | #include 52 | #include 53 | 54 | #define BUFFSIZE (8 * 1024) 55 | #define DEFAULT_COUNT 0 56 | #define DEFAULT_TIMEOUT 0 57 | #define DEFAULT_PASSWD "password" 58 | #define DEFAULT_PROMPT "[Pp]assword: \\{0,1\\}$" 59 | #define DEFAULT_YESNO "(yes/no)? \\{0,1\\}$" 60 | 61 | #define ERROR_GENERAL (200 + 1) 62 | #define ERROR_USAGE (200 + 2) 63 | #define ERROR_TIMEOUT (200 + 3) 64 | #define ERROR_SYS (200 + 4) 65 | #define ERROR_MAX_TRIES (200 + 5) 66 | 67 | char * const MY_NAME = "passh"; 68 | char * const VERSION_ = "1.0.2"; 69 | 70 | static struct { 71 | char *progname; 72 | bool reset_on_exit; 73 | struct termios save_termios; 74 | bool SIGCHLDed; 75 | bool received_winch; 76 | bool stdin_is_tty; 77 | bool now_interactive; 78 | 79 | int fd_ptym; 80 | 81 | struct { 82 | bool ignore_case; 83 | bool nohup_child; 84 | bool fatal_no_prompt; 85 | bool auto_yesno; 86 | char *password; 87 | char *passwd_prompt; 88 | char *yesno_prompt; 89 | regex_t re_prompt; 90 | regex_t re_yesno; 91 | int timeout; 92 | int tries; 93 | bool fatal_more_tries; 94 | char **command; 95 | 96 | char *log_to_pty; 97 | char *log_from_pty; 98 | } opt; 99 | } g; 100 | 101 | void 102 | show_version(void) 103 | { 104 | printf("%s %s\n", MY_NAME, VERSION_); 105 | 106 | exit(0); 107 | } 108 | 109 | void 110 | usage(int exitcode) 111 | { 112 | printf("Usage: %s [OPTION]... COMMAND...\n" 113 | "\n" 114 | " -c Send at most passwords (0 means infinite. Default: %d)\n" 115 | " -C Exit if prompted for the th password\n" 116 | " -h Help\n" 117 | " -i Case insensitive for password prompt matching\n" 118 | " -n Nohup the child (e.g. used for `ssh -f')\n" 119 | " -p The password (Default: `" DEFAULT_PASSWD "')\n" 120 | " -p env: Read password from env var\n" 121 | " -p file: Read password from file\n" 122 | " -p sock: Read password from UNIX socket\n" 123 | " -P Regexp (BRE) for the password prompt\n" 124 | " (Default: `" DEFAULT_PROMPT "')\n" 125 | " -l Save data written to the pty\n" 126 | " -L Save data read from the pty\n" 127 | " -t Timeout waiting for next password prompt\n" 128 | " (0 means no timeout. Default: %d)\n" 129 | " -T Exit if timed out waiting for password prompt\n" 130 | " -V Show version\n" 131 | " -y Auto answer `(yes/no)?' questions\n" 132 | #if 0 133 | " -Y Regexp (BRE) for the `yes/no' prompt\n" 134 | " (Default: `" DEFAULT_YESNO "')\n" 135 | #endif 136 | "\n" 137 | "Report bugs to Clark Wang \n" 138 | "", g.progname, DEFAULT_COUNT, DEFAULT_TIMEOUT); 139 | 140 | exit(exitcode); 141 | } 142 | 143 | void 144 | fatal(int rcode, const char *fmt, ...) 145 | { 146 | va_list ap; 147 | char buf[1024]; 148 | 149 | va_start(ap, fmt); 150 | vsnprintf(buf, sizeof(buf), fmt, ap); 151 | va_end(ap); 152 | 153 | /* in case stdout and stderr are the same */ 154 | fflush(stdout); 155 | 156 | fprintf(stderr, "!! %s\r\n", buf); 157 | 158 | /* flush all open files */ 159 | fflush(NULL); 160 | 161 | exit(rcode); 162 | } 163 | 164 | void 165 | fatal_sys(const char *fmt, ...) 166 | { 167 | va_list ap; 168 | char buf[1024]; 169 | int error = errno; 170 | 171 | va_start(ap, fmt); 172 | vsnprintf(buf, sizeof(buf), fmt, ap); 173 | va_end(ap); 174 | 175 | fatal(ERROR_SYS, "%s: %s (%d)", buf, strerror(error), error); 176 | } 177 | 178 | void 179 | startup() 180 | { 181 | g.opt.passwd_prompt = DEFAULT_PROMPT; 182 | g.opt.yesno_prompt = DEFAULT_YESNO; 183 | g.opt.password = DEFAULT_PASSWD; 184 | g.opt.tries = DEFAULT_COUNT; 185 | g.opt.timeout = DEFAULT_TIMEOUT; 186 | } 187 | 188 | ssize_t 189 | socketread(char *buf, size_t len, char *path) 190 | { 191 | int fd, ret; 192 | ssize_t n; 193 | struct sockaddr_un addr; 194 | 195 | fd = socket(AF_UNIX, SOCK_STREAM, 0); 196 | if (fd < 0) { 197 | return -1; 198 | } 199 | 200 | memset(&addr, 0, sizeof(addr)); 201 | addr.sun_family = AF_UNIX; 202 | strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1); 203 | 204 | ret = connect(fd, (const struct sockaddr *) &addr, sizeof(addr)); 205 | /* Don't close(fd) on error so the caller can inspect errno. */ 206 | if (ret < 0) { 207 | return -1; 208 | } 209 | 210 | n = read(fd, buf, len - 1); 211 | /* Don't close(fd) on error so the caller can inspect errno. */ 212 | if (n < 0) { 213 | return -1; 214 | } 215 | close(fd); 216 | 217 | buf[n] = '\0'; 218 | return n; 219 | } 220 | 221 | char * 222 | arg2pass(char *optarg) 223 | { 224 | char *pass = NULL; 225 | 226 | if (strncmp(optarg, "file:", 5) == 0) { 227 | FILE *fp = fopen(optarg + 5, "r"); 228 | char buf[1024] = ""; 229 | 230 | if (fp == NULL) { 231 | fatal_sys("failed to open file %s", optarg + 5); 232 | } 233 | 234 | if (fgets(buf, sizeof(buf), fp) == NULL) { 235 | fatal(ERROR_GENERAL, "failed to read the file"); 236 | } 237 | fclose(fp); 238 | 239 | pass = strtok(buf, "\r\n"); 240 | if (pass) { 241 | pass = strdup(pass); 242 | } else { 243 | pass = strdup(""); 244 | } 245 | } else if (strncmp(optarg, "env:", 4) == 0) { 246 | pass = getenv(optarg + 4); 247 | if (pass) { 248 | pass = strdup(pass); 249 | } else { 250 | fatal(ERROR_GENERAL, "env var not found: %s", optarg + 4); 251 | } 252 | } else if (strncmp(optarg, "sock:", 5) == 0) { 253 | char buf[1024] = ""; 254 | 255 | if (socketread(buf, sizeof(buf), optarg + 5) < 0) { 256 | fatal_sys("failed to read from socket %s", optarg + 5); 257 | } 258 | 259 | pass = strdup(buf); 260 | } else { 261 | pass = strdup(optarg); 262 | } 263 | 264 | return pass; 265 | } 266 | 267 | void 268 | getargs(int argc, char **argv) 269 | { 270 | int ch, i, r, reflag; 271 | 272 | if ((g.progname = strrchr(argv[0], '/')) != NULL) { 273 | ++g.progname; 274 | } else { 275 | g.progname = argv[0]; 276 | } 277 | 278 | if (argc == 1 || (argc == 2 && strcmp("--help", argv[1]) == 0) ) { 279 | usage(0); 280 | } 281 | 282 | if (argc == 2 && strcmp("--version", argv[1]) == 0) { 283 | show_version(); 284 | } 285 | 286 | /* 287 | * If the first character of optstring is '+' or the environment variable 288 | * POSIXLY_CORRECT is set, then option processing stops as soon as a 289 | * nonoption argument is encountered. 290 | */ 291 | while ((ch = getopt(argc, argv, "+:c:Chil:L:np:P:t:TVy")) != -1) { 292 | switch (ch) { 293 | case 'c': 294 | g.opt.tries = atoi(optarg); 295 | break; 296 | case 'C': 297 | g.opt.fatal_more_tries = true; 298 | break; 299 | case 'h': 300 | usage(0); 301 | 302 | case 'i': 303 | g.opt.ignore_case = true; 304 | break; 305 | 306 | case 'l': 307 | g.opt.log_to_pty = optarg; 308 | break; 309 | 310 | case 'L': 311 | g.opt.log_from_pty = optarg; 312 | break; 313 | 314 | case 'n': 315 | g.opt.nohup_child = true; 316 | break; 317 | 318 | case 'p': 319 | g.opt.password = arg2pass(optarg); 320 | for (i = 0; i < strlen(optarg); ++i) { 321 | optarg[i] = '*'; 322 | } 323 | if (g.opt.password == NULL) { 324 | fatal(ERROR_USAGE, "Error: failed to get password"); 325 | } 326 | break; 327 | 328 | case 'P': 329 | g.opt.passwd_prompt = optarg; 330 | break; 331 | 332 | case 't': 333 | g.opt.timeout = atoi(optarg); 334 | break; 335 | 336 | case 'T': 337 | g.opt.fatal_no_prompt = true; 338 | break; 339 | 340 | case 'V': 341 | show_version(); 342 | break; 343 | 344 | case 'y': 345 | g.opt.auto_yesno = true; 346 | break; 347 | #if 0 348 | case 'Y': 349 | g.opt.yesno_prompt = optarg; 350 | break; 351 | #endif 352 | case ':': 353 | fatal(ERROR_USAGE, "Error: option '-%c' requires an argument", optopt); 354 | break; 355 | 356 | case '?': 357 | default: 358 | fatal(ERROR_USAGE, "Error: unknown option '-%c'", optopt); 359 | } 360 | } 361 | argc -= optind; 362 | argv += optind; 363 | 364 | if (0 == argc) { 365 | fatal(ERROR_USAGE, "Error: no command specified"); 366 | } 367 | g.opt.command = argv; 368 | 369 | if (0 == strlen(g.opt.passwd_prompt) ) { 370 | fatal(ERROR_USAGE, "Error: empty prompt"); 371 | } 372 | 373 | /* Password: */ 374 | reflag = 0; 375 | reflag |= g.opt.ignore_case ? REG_ICASE : 0; 376 | r = regcomp(&g.opt.re_prompt, g.opt.passwd_prompt, reflag); 377 | if (r != 0) { 378 | fatal(ERROR_USAGE, "Error: invalid RE for password prompt"); 379 | } 380 | /* (yes/no)? */ 381 | r = regcomp(&g.opt.re_yesno, g.opt.yesno_prompt, reflag); 382 | if (r != 0) { 383 | fatal(ERROR_USAGE, "Error: invalid RE for yes/no prompt"); 384 | } 385 | } 386 | 387 | int 388 | ptym_open(char *pts_name, int pts_namesz) 389 | { 390 | char *ptr; 391 | int fdm; 392 | 393 | snprintf(pts_name, pts_namesz, "/dev/ptmx"); 394 | 395 | fdm = posix_openpt(O_RDWR); 396 | if (fdm < 0) 397 | return (-1); 398 | 399 | if (grantpt(fdm) < 0) { 400 | close(fdm); 401 | return (-2); 402 | } 403 | 404 | if (unlockpt(fdm) < 0) { 405 | close(fdm); 406 | return (-3); 407 | } 408 | 409 | if ((ptr = ptsname(fdm)) == NULL) { 410 | close(fdm); 411 | return (-4); 412 | } 413 | 414 | snprintf(pts_name, pts_namesz, "%s", ptr); 415 | return (fdm); 416 | } 417 | 418 | int 419 | ptys_open(char *pts_name) 420 | { 421 | int fds; 422 | 423 | if ((fds = open(pts_name, O_RDWR)) < 0) 424 | return (-5); 425 | return (fds); 426 | } 427 | 428 | pid_t 429 | pty_fork(int *ptrfdm, char *slave_name, int slave_namesz, 430 | const struct termios *slave_termios, 431 | const struct winsize *slave_winsize) 432 | { 433 | int fdm, fds; 434 | pid_t pid; 435 | char pts_name[32]; 436 | 437 | if ((fdm = ptym_open(pts_name, sizeof(pts_name))) < 0) 438 | fatal_sys("can't open master pty: %s, error %d", pts_name, fdm); 439 | 440 | if (slave_name != NULL) { 441 | /* 442 | * Return name of slave. Null terminate to handle case 443 | * where strlen(pts_name) > slave_namesz. 444 | */ 445 | snprintf(slave_name, slave_namesz, "%s", pts_name); 446 | } 447 | 448 | if ((pid = fork()) < 0) { 449 | return (-1); 450 | } else if (pid == 0) { 451 | /* 452 | * child 453 | */ 454 | if (setsid() < 0) 455 | fatal_sys("setsid error"); 456 | 457 | /* 458 | * System V acquires controlling terminal on open(). 459 | */ 460 | if ((fds = ptys_open(pts_name)) < 0) 461 | fatal_sys("can't open slave pty"); 462 | 463 | /* all done with master in child */ 464 | close(fdm); 465 | 466 | #if defined(TIOCSCTTY) 467 | /* 468 | * TIOCSCTTY is the BSD way to acquire a controlling terminal. 469 | * 470 | * Don't check the return code. It would fail in Cygwin. 471 | */ 472 | ioctl(fds, TIOCSCTTY, (char *)0); 473 | #endif 474 | /* 475 | * Set slave's termios and window size. 476 | */ 477 | if (slave_termios != NULL) { 478 | if (tcsetattr(fds, TCSANOW, slave_termios) < 0) 479 | fatal_sys("tcsetattr error on slave pty"); 480 | } 481 | if (slave_winsize != NULL) { 482 | if (ioctl(fds, TIOCSWINSZ, slave_winsize) < 0) 483 | fatal_sys("TIOCSWINSZ error on slave pty"); 484 | } 485 | 486 | /* 487 | * Slave becomes stdin/stdout/stderr of child. 488 | */ 489 | if (dup2(fds, STDIN_FILENO) != STDIN_FILENO) 490 | fatal_sys("dup2 error to stdin"); 491 | if (dup2(fds, STDOUT_FILENO) != STDOUT_FILENO) 492 | fatal_sys("dup2 error to stdout"); 493 | if (dup2(fds, STDERR_FILENO) != STDERR_FILENO) 494 | fatal_sys("dup2 error to stderr"); 495 | if (fds != STDIN_FILENO && fds != STDOUT_FILENO && 496 | fds != STDERR_FILENO) { 497 | close(fds); 498 | } 499 | 500 | return (0); 501 | } else { 502 | /* 503 | * parent 504 | */ 505 | *ptrfdm = fdm; 506 | return (pid); 507 | } 508 | } 509 | 510 | int 511 | tty_raw(int fd, struct termios *save_termios) 512 | { 513 | int err; 514 | struct termios buf; 515 | 516 | if (tcgetattr(fd, &buf) < 0) 517 | return (-1); 518 | *save_termios = buf; 519 | 520 | /* 521 | * Echo off, canonical mode off, extended input 522 | * processing off, signal chars off. 523 | */ 524 | buf.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG); 525 | 526 | /* 527 | * No SIGINT on BREAK, CR-to-NL off, input parity 528 | * check off, don't strip 8th bit on input, output 529 | * flow control off. 530 | */ 531 | buf.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON); 532 | 533 | /* 534 | * Clear size bits, parity checking off. 535 | */ 536 | buf.c_cflag &= ~(CSIZE | PARENB); 537 | 538 | /* 539 | * Set 8 bits/char. 540 | */ 541 | buf.c_cflag |= CS8; 542 | 543 | /* 544 | * Output processing off. 545 | */ 546 | buf.c_oflag &= ~(OPOST); 547 | 548 | /* 549 | * Case B: 1 byte at a time, no timer. 550 | */ 551 | buf.c_cc[VMIN] = 1; 552 | buf.c_cc[VTIME] = 0; 553 | if (tcsetattr(fd, TCSAFLUSH, &buf) < 0) 554 | return (-1); 555 | 556 | /* 557 | * Verify that the changes stuck. tcsetattr can return 0 on 558 | * partial success. 559 | */ 560 | if (tcgetattr(fd, &buf) < 0) { 561 | err = errno; 562 | tcsetattr(fd, TCSAFLUSH, save_termios); 563 | errno = err; 564 | return (-1); 565 | } 566 | if ((buf.c_lflag & (ECHO | ICANON | IEXTEN | ISIG)) || 567 | (buf.c_iflag & (BRKINT | ICRNL | INPCK | ISTRIP | IXON)) || 568 | (buf.c_cflag & (CSIZE | PARENB | CS8)) != CS8 || 569 | (buf.c_oflag & OPOST) || buf.c_cc[VMIN] != 1 || 570 | buf.c_cc[VTIME] != 0) { 571 | /* 572 | * Only some of the changes were made. Restore the 573 | * original settings. 574 | */ 575 | tcsetattr(fd, TCSAFLUSH, save_termios); 576 | errno = EINVAL; 577 | return (-1); 578 | } 579 | 580 | return (0); 581 | } 582 | 583 | int 584 | tty_reset(int fd, struct termios *termio) 585 | { 586 | if (tcsetattr(fd, TCSAFLUSH, termio) < 0) 587 | return (-1); 588 | return (0); 589 | } 590 | 591 | void 592 | tty_atexit(void) 593 | { 594 | if (g.reset_on_exit) { 595 | tty_reset(STDIN_FILENO, &g.save_termios); 596 | } 597 | } 598 | 599 | ssize_t 600 | read_if_ready(int fd, char *buf, size_t n) 601 | { 602 | struct timeval timeout; 603 | fd_set fds; 604 | int nread; 605 | 606 | timeout.tv_sec = 0; 607 | timeout.tv_usec = 0; 608 | 609 | FD_ZERO(&fds); 610 | FD_SET(fd, &fds); 611 | if (select(fd + 1, &fds, NULL, NULL, &timeout) < 0) { 612 | return -1; 613 | } 614 | if (! FD_ISSET(fd, &fds) ) { 615 | return 0; 616 | } 617 | if ((nread = read(fd, buf, n) ) < 0) { 618 | return -1; 619 | } 620 | return nread; 621 | } 622 | 623 | ssize_t 624 | writen(int fd, const void *ptr, size_t n) 625 | { 626 | size_t nleft; 627 | ssize_t nwritten; 628 | 629 | nleft = n; 630 | while (nleft > 0) { 631 | if ((nwritten = write(fd, ptr, nleft)) < 0) { 632 | if (nleft == n) { 633 | return (-1); 634 | } else { 635 | /* error, return amount written so far */ 636 | break; 637 | } 638 | } else if (nwritten == 0) { 639 | break; 640 | } 641 | nleft -= nwritten; 642 | ptr += nwritten; 643 | } 644 | return (n - nleft); 645 | } 646 | 647 | /* 648 | * The only portable use of signal() is to set a signal's disposition 649 | * to SIG_DFL or SIG_IGN. The semantics when using signal() to 650 | * establish a signal handler vary across systems (and POSIX.1 651 | * explicitly permits this variation); do not use it for this purpose. 652 | * 653 | * POSIX.1 solved the portability mess by specifying sigaction(2), 654 | * which provides explicit control of the semantics when a signal 655 | * handler is invoked; use that interface instead of signal(). 656 | * 657 | * In the original UNIX systems, when a handler that was established 658 | * using signal() was invoked by the delivery of a signal, the 659 | * disposition of the signal would be reset to SIG_DFL, and the system 660 | * did not block delivery of further instances of the signal. This is 661 | * equivalent to calling sigaction(2) with the following flags: 662 | * 663 | * sa.sa_flags = SA_RESETHAND | SA_NODEFER; 664 | */ 665 | void 666 | sig_handle(int signo, void (*handler)(int) ) 667 | { 668 | struct sigaction act; 669 | 670 | memset(&act, 0, sizeof(act) ); 671 | act.sa_handler = handler; 672 | sigaction(signo, &act, NULL); 673 | } 674 | 675 | void 676 | sig_child(int signo) 677 | { 678 | g.SIGCHLDed = true; 679 | } 680 | 681 | void 682 | sig_winch(int signum) 683 | { 684 | g.received_winch = true; 685 | return; 686 | } 687 | 688 | #define write2(fd1, fd2, buf, len) \ 689 | do { \ 690 | int fds[2] = { fd1, fd2 }; \ 691 | int i; \ 692 | for (i = 0; i < 2; ++i) { \ 693 | if (fds[i] < 0) { \ 694 | continue; \ 695 | } \ 696 | if (writen(fds[i], buf, (len) ) != (len) ) { \ 697 | fatal_sys("write: fd %d", fds[i]); \ 698 | } \ 699 | } \ 700 | } while (0) 701 | void 702 | big_loop() 703 | { 704 | char buf1[BUFFSIZE]; /* for read() from stdin */ 705 | char buf2[2 * BUFFSIZE + 1]; /* for read() from ptym, `+1' for adding the '\000' */ 706 | char *cache = buf2; 707 | int nread, ncache = 0; 708 | struct timeval select_timeout; 709 | fd_set readfds; 710 | int i, r, status; 711 | regmatch_t re_match[1]; 712 | time_t last_time = time(NULL); 713 | bool given_up = false; 714 | int passwords_seen = 0; 715 | int fd_to_pty = -1, fd_from_pty = -1; 716 | bool stdin_eof = false; 717 | int exit_code = -1; 718 | pid_t wait_return; 719 | 720 | if (g.opt.log_to_pty != NULL) { 721 | fd_to_pty = open(g.opt.log_to_pty, O_CREAT | O_WRONLY | O_TRUNC, 0600); 722 | if (fd_to_pty < 0) { 723 | fatal_sys("open: %s", g.opt.log_to_pty); 724 | } 725 | } 726 | if (g.opt.log_from_pty != NULL) { 727 | fd_from_pty = open(g.opt.log_from_pty, O_CREAT | O_WRONLY | O_TRUNC, 0600); 728 | if (fd_from_pty < 0) { 729 | fatal_sys("open: %s", g.opt.log_from_pty); 730 | } 731 | } 732 | 733 | /* 734 | * wait for the child to open the pty 735 | */ 736 | do { 737 | /* 738 | * On Mac, fcntl(O_NONBLOCK) may fail before the child opens the pty 739 | * slave side. So wait a while for the child to open the pty slave. 740 | */ 741 | fd_set writefds; 742 | 743 | select_timeout.tv_sec = 1; 744 | select_timeout.tv_usec = 0; 745 | 746 | FD_ZERO(&writefds); 747 | FD_SET(g.fd_ptym, &writefds); 748 | 749 | select(g.fd_ptym + 1, NULL, &writefds, NULL, &select_timeout); 750 | if (! FD_ISSET(g.fd_ptym, &writefds) ) { 751 | fatal(ERROR_GENERAL, "failed to wait for ptym to be writable"); 752 | } 753 | } while (0); 754 | 755 | while (true) { 756 | L_chk_sigchld: 757 | if (g.SIGCHLDed) { 758 | /* 759 | * NOTE: 760 | * - WCONTINUED does not work on macOS (10.12.5) 761 | * - On macOS, SIGCHLD can be generated when 762 | * 1. child process has terminated/exited 763 | * 2. the currently *running* child process is stopped (e.g. by `kill -STOP') 764 | * - On Linux, SIGCHLD can be generated when 765 | * 1. child process has terminated/exited 766 | * 2. the currently *running* child process is stopped (e.g. by `kill -STOP') 767 | * 3. the currently *stopped* child process is continued (e.g. by `kill -CONT') 768 | * - waitpid(WCONTINUED) works on Linux but not on macOS. 769 | */ 770 | wait_return = waitpid(-1, &status, WUNTRACED | WCONTINUED); 771 | if (wait_return < 0) { 772 | fatal_sys("received SIGCHLD but waitpid() failed"); 773 | } 774 | g.SIGCHLDed = false; 775 | 776 | if (WIFEXITED(status) ) { 777 | exit_code = WEXITSTATUS(status); 778 | goto L_done; 779 | } else if (WIFSIGNALED(status) ) { 780 | exit_code = status + 128; 781 | goto L_done; 782 | } else if (WIFSTOPPED(status) ) { 783 | /* Do nothing. Just wait for the child to be continued and wait 784 | * for the next SIGCHLD. */ 785 | } else if (WIFCONTINUED(status) ) { 786 | /* */ 787 | } else { 788 | /* This should not happen. */ 789 | goto L_done; 790 | } 791 | } 792 | 793 | if (g.opt.timeout != 0 && g.opt.fatal_no_prompt && passwords_seen == 0 794 | && labs(time(NULL) - last_time) > g.opt.timeout) { 795 | fatal(ERROR_TIMEOUT, "timeout waiting for password prompt"); 796 | } 797 | 798 | if (g.received_winch && g.stdin_is_tty) { 799 | struct winsize ttysize; 800 | static int ourtty = -1; 801 | 802 | g.received_winch = false; 803 | 804 | if (ourtty < 0) { 805 | #if 0 806 | ourtty = open("/dev/tty", 0); 807 | #else 808 | ourtty = STDIN_FILENO; 809 | #endif 810 | } 811 | if (ioctl(ourtty, TIOCGWINSZ, &ttysize) == 0) { 812 | ioctl(g.fd_ptym, TIOCSWINSZ, &ttysize); 813 | } 814 | } 815 | 816 | /* Keep sending EOF until the child exits 817 | * - See http://lists.gnu.org/archive/html/help-bash/2016-11/msg00002.html 818 | * (EOF ('\004') was lost if it's sent to bash too quickly) 819 | * - We cannot simply close(fd_ptym) or the child will get SIGHUP. */ 820 | while (stdin_eof) { 821 | struct termios term; 822 | char eof_char; 823 | static struct timeval last; 824 | struct timeval now; 825 | double diff; 826 | 827 | if (last.tv_sec == 0) { 828 | gettimeofday(&last, NULL); 829 | break; 830 | } 831 | 832 | gettimeofday(&now, NULL); 833 | diff = now.tv_sec + now.tv_usec / 1e6 - (last.tv_sec + last.tv_usec / 1e6); 834 | if (diff > -0.05 && diff < 0.05) { 835 | break; 836 | } 837 | last = now; 838 | 839 | if (tcgetattr(g.fd_ptym, &term) < 0) { 840 | goto L_done; 841 | } 842 | eof_char = term.c_cc[VEOF]; 843 | if (write(g.fd_ptym, &eof_char, 1) < 0) { 844 | goto L_done; 845 | } 846 | write(fd_to_pty, &eof_char, 1); 847 | 848 | break; 849 | } 850 | 851 | FD_ZERO(&readfds); 852 | if (g.stdin_is_tty && !stdin_eof) { 853 | FD_SET(STDIN_FILENO, &readfds); 854 | } 855 | FD_SET(g.fd_ptym, &readfds); 856 | 857 | select_timeout.tv_sec = 1; 858 | select_timeout.tv_usec = 100 * 1000; 859 | 860 | r = select(g.fd_ptym + 1, &readfds, NULL, NULL, &select_timeout); 861 | if (r == 0) { 862 | /* timeout */ 863 | continue; 864 | } else if (r < 0) { 865 | if (errno == EINTR) { 866 | continue; 867 | } else { 868 | fatal_sys("select error"); 869 | } 870 | } 871 | 872 | /* 873 | * copy data from ptym to stdout 874 | */ 875 | if (FD_ISSET(g.fd_ptym, &readfds) ) { 876 | while (true) { 877 | nread = read_if_ready(g.fd_ptym, cache + ncache, 878 | 2 * BUFFSIZE - (cache - buf2)); 879 | if (nread <= 0) { 880 | /* child exited? */ 881 | goto L_chk_sigchld; 882 | } 883 | 884 | write2(STDOUT_FILENO, fd_from_pty, cache + ncache, nread); 885 | 886 | if (! given_up && g.opt.timeout != 0 887 | && labs(time(NULL) - last_time) >= g.opt.timeout) { 888 | given_up = true; 889 | } 890 | 891 | /* regexec() does not like NULLs */ 892 | if (! given_up) { 893 | for (i = 0; i < nread; ++i) { 894 | if (cache[ncache + i] == 0) { 895 | cache[ncache + i] = 0xff; 896 | } 897 | } 898 | } 899 | ncache += nread; 900 | /* make it NULL-terminated so regexec() would be happy */ 901 | cache[ncache] = 0; 902 | 903 | /* match password prompt and send the password */ 904 | if (! g.now_interactive && ! given_up) { 905 | if (g.opt.auto_yesno && passwords_seen == 0 906 | && regexec(&g.opt.re_yesno, cache, 1, re_match, 0) == 0) 907 | { 908 | /* 909 | * (yes/no)? 910 | */ 911 | char *yes = "yes\r"; 912 | 913 | write2(g.fd_ptym, fd_to_pty, yes, strlen(yes) ); 914 | 915 | ncache -= re_match[0].rm_eo; 916 | cache += re_match[0].rm_eo; 917 | } else if (regexec(&g.opt.re_prompt, cache, 1, re_match, 0) == 0) { 918 | /* 919 | * Password: 920 | */ 921 | 922 | ++passwords_seen; 923 | 924 | last_time = time(NULL); 925 | 926 | if (g.opt.fatal_more_tries) { 927 | if (g.opt.tries != 0 && passwords_seen > g.opt.tries) { 928 | fatal(ERROR_MAX_TRIES, "still prompted for passwords after %d tries", g.opt.tries); 929 | } 930 | } else if (g.opt.tries != 0 && passwords_seen >= g.opt.tries) { 931 | given_up = true; 932 | } 933 | 934 | write(g.fd_ptym, g.opt.password, strlen(g.opt.password)); 935 | write(g.fd_ptym, "\r", 1); 936 | 937 | write(fd_to_pty, "********\r", strlen("********\r") ); 938 | 939 | ncache -= re_match[0].rm_eo; 940 | cache += re_match[0].rm_eo; 941 | } 942 | } else { 943 | cache = buf2; 944 | ncache = 0; 945 | } 946 | 947 | if (cache + ncache >= buf2 + 2 * BUFFSIZE) { 948 | if (ncache > BUFFSIZE) { 949 | cache += ncache - BUFFSIZE; 950 | ncache = BUFFSIZE; 951 | } 952 | memmove(buf2, cache, ncache); 953 | cache = buf2; 954 | } 955 | } 956 | } 957 | /* 958 | * copy data from stdin to ptym 959 | */ 960 | if (!stdin_eof && FD_ISSET(STDIN_FILENO, &readfds) ) { 961 | if ((nread = read(STDIN_FILENO, buf1, BUFFSIZE)) < 0) 962 | fatal_sys("read error from stdin"); 963 | else if (nread == 0) { 964 | /* EOF on stdin means we're done */ 965 | stdin_eof = true; 966 | } else { 967 | g.now_interactive = true; 968 | write2(g.fd_ptym, fd_to_pty, buf1, nread); 969 | } 970 | } 971 | } 972 | 973 | L_done: 974 | /* the child has exited but there may be still some data for us 975 | * to read */ 976 | while ((nread = read_if_ready(g.fd_ptym, buf2, BUFFSIZE) ) > 0) { 977 | write2(STDOUT_FILENO, fd_from_pty, buf2, nread); 978 | } 979 | 980 | if (fd_to_pty >= 0) { 981 | close(fd_to_pty); 982 | } 983 | if (fd_from_pty >= 0) { 984 | close(fd_from_pty); 985 | } 986 | 987 | if (exit_code < 0) { 988 | exit(ERROR_GENERAL); 989 | } else { 990 | exit(exit_code); 991 | } 992 | } 993 | 994 | int 995 | main(int argc, char *argv[]) 996 | { 997 | char slave_name[32]; 998 | pid_t pid; 999 | struct termios orig_termios; 1000 | struct winsize size; 1001 | 1002 | startup(); 1003 | 1004 | getargs(argc, argv); 1005 | 1006 | g.stdin_is_tty = isatty(STDIN_FILENO); 1007 | 1008 | sig_handle(SIGCHLD, sig_child); 1009 | 1010 | if (g.stdin_is_tty) { 1011 | if (tcgetattr(STDIN_FILENO, &orig_termios) < 0) 1012 | fatal_sys("tcgetattr error on stdin"); 1013 | if (ioctl(STDIN_FILENO, TIOCGWINSZ, (char *) &size) < 0) 1014 | fatal_sys("TIOCGWINSZ error"); 1015 | 1016 | pid = pty_fork(&g.fd_ptym, slave_name, sizeof(slave_name), 1017 | &orig_termios, &size); 1018 | 1019 | } else { 1020 | pid = pty_fork(&g.fd_ptym, slave_name, sizeof(slave_name), 1021 | NULL, NULL); 1022 | } 1023 | 1024 | if (pid < 0) { 1025 | fatal_sys("fork error"); 1026 | } else if (pid == 0) { 1027 | /* 1028 | * child 1029 | */ 1030 | if (g.opt.nohup_child) { 1031 | sig_handle(SIGHUP, SIG_IGN); 1032 | } 1033 | if (execvp(g.opt.command[0], g.opt.command) < 0) 1034 | fatal_sys("can't execute: %s", g.opt.command[0]); 1035 | } 1036 | 1037 | /* 1038 | * parent 1039 | */ 1040 | 1041 | /* stdout also needs to be checked. Or `passh ls -l | less' would not 1042 | * restore the saved tty settings. */ 1043 | if (g.stdin_is_tty && isatty(STDOUT_FILENO) ) { 1044 | /* user's tty to raw mode */ 1045 | if (tty_raw(STDIN_FILENO, &g.save_termios) < 0) 1046 | fatal_sys("tty_raw error"); 1047 | 1048 | /* reset user's tty on exit */ 1049 | g.reset_on_exit = true; 1050 | if (atexit(tty_atexit) < 0) 1051 | fatal_sys("atexit error"); 1052 | 1053 | sig_handle(SIGWINCH, sig_winch); 1054 | } 1055 | 1056 | big_loop(); 1057 | 1058 | return 0; 1059 | } 1060 | 1061 | /* vi:set ts=8 sw=4 sta et: */ 1062 | -------------------------------------------------------------------------------- /sshpass-broken.md: -------------------------------------------------------------------------------- 1 | All the examples are tested with `sshpass-1.06`. 2 | 3 | Example #1 4 | ---------- 5 | 6 | With `sshpass`: 7 | 8 | $ tty 9 | /dev/pts/18 // now we're on pts/18 10 | $ sshpass bash --norc 11 | bash: cannot set terminal process group (-1): Inappropriate ioctl for device <<< Bash not happy 12 | bash: no job control in this shell <<< Bash not happy 13 | bash-4.4# tty 14 | /dev/pts/18 // the bash's stdin is also connected to pts/18 15 | bash-4.4# ps p $$ 16 | PID TTY STAT TIME COMMAND 17 | 37151 pts/36 Ss+ 0:00 bash --norc // but the controlling terminal is pts/36 18 | bash-4.4# ps t pts/36 19 | PID TTY STAT TIME COMMAND 20 | 37151 pts/36 Ss+ 0:00 bash --norc 21 | 37154 pts/36 R+ 0:00 ps t pts/36 22 | bash-4.4# 23 | 24 | Now let's try `passh`: 25 | 26 | $ tty 27 | /dev/pts/18 // now we're on pts/18 28 | $ passh bash --norc 29 | bash-4.4# tty 30 | /dev/pts/36 // the bash's stdin is connected to the new pts/36 31 | bash-4.4# ps p $$ 32 | PID TTY STAT TIME COMMAND 33 | 37159 pts/36 Ss 0:00 bash --norc // pts/36 is its controlling terminal 34 | bash-4.4# ps t pts/36 35 | PID TTY STAT TIME COMMAND 36 | 37159 pts/36 Ss 0:00 bash --norc 37 | 37162 pts/36 R+ 0:00 ps t pts/36 38 | bash-4.4# 39 | 40 | Example #2 41 | ---------- 42 | 43 | $ sshpass bash --norc 44 | bash: cannot set terminal process group (-1): Inappropriate ioctl for device 45 | bash: no job control in this shell 46 | bash-5.0# <== Press Ctrl-C here and the shell will be killed. 47 | 48 | Example #3 49 | ---------- 50 | 51 | $ sshpass bash --norc 52 | bash: cannot set terminal process group (-1): Inappropriate ioctl for device 53 | bash: no job control in this shell 54 | bash-5.0# sleep 60 55 | <== Press Ctrl-C to kill 'sleep' but Bash would also be killed. 56 | 57 | Example #4 58 | ---------- 59 | 60 | $ sshpass bash --norc 61 | bash: cannot set terminal process group (-1): Inappropriate ioctl for device 62 | bash: no job control in this shell 63 | bash-5.0# read < /dev/tty 64 | it 65 | cannot 66 | read 67 | from 68 | /dev/tty 69 | <== The 'read' never returns. Ctrl-D does not work either. 70 | <== You have to press Ctrl-C to kill bash. 71 | 72 | Example #5 73 | ---------- 74 | 75 | $ sshpass bash --norc 76 | bash: cannot set terminal process group (-1): Inappropriate ioctl for device 77 | bash: no job control in this shell 78 | bash-5.0# echo password: > /dev/tty 79 | bash-5.0# <== It hangs here. Press Ctrl-C to kill it. 80 | 81 | Example #6 82 | ---------- 83 | 84 | $ sshpass -p xxx bash --norc 85 | bash: cannot set terminal process group (-1): Inappropriate ioctl for device 86 | bash: no job control in this shell 87 | bash-5.0# echo password: > /dev/tty 88 | bash-5.0# echo password: > /dev/tty 89 | $ <== The two echo commands killed Bash. 90 | 91 | Example #7 92 | ---------- 93 | 94 | # sshpass -p some-passwd ssh no-such-user@127.0.0.1 date 95 | # echo $? <== It silently fails. No error messages. 96 | 5 97 | # 98 | --------------------------------------------------------------------------------