djm@openbsd.org | 59175a3 | 2019-12-06 03:06:08 +0000 | [diff] [blame] | 1 | /* $OpenBSD: readpass.c,v 1.60 2019/12/06 03:06:08 djm Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 3606ee2 | 2002-02-13 14:05:23 +1100 | [diff] [blame] | 3 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 13 | * |
Damien Miller | 3606ee2 | 2002-02-13 14:05:23 +1100 | [diff] [blame] | 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 24 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 25 | |
| 26 | #include "includes.h" |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/wait.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 30 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 31 | #include <errno.h> |
Damien Miller | 57cf638 | 2006-07-10 21:13:46 +1000 | [diff] [blame] | 32 | #include <fcntl.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 33 | #ifdef HAVE_PATHS_H |
Damien Miller | a9263d0 | 2006-03-15 11:18:26 +1100 | [diff] [blame] | 34 | # include <paths.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 35 | #endif |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 36 | #include <signal.h> |
Darren Tucker | 5d19626 | 2006-07-12 22:15:16 +1000 | [diff] [blame] | 37 | #include <stdarg.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 38 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 39 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 40 | #include <string.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 41 | #include <unistd.h> |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 42 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 43 | #include "xmalloc.h" |
Darren Tucker | e608ca2 | 2004-05-13 16:15:47 +1000 | [diff] [blame] | 44 | #include "misc.h" |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 45 | #include "pathnames.h" |
| 46 | #include "log.h" |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 47 | #include "ssh.h" |
Damien Miller | 6b4069a | 2006-06-13 13:05:15 +1000 | [diff] [blame] | 48 | #include "uidswap.h" |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 49 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 50 | static char * |
djm@openbsd.org | 59175a3 | 2019-12-06 03:06:08 +0000 | [diff] [blame] | 51 | ssh_askpass(char *askpass, const char *msg, const char *env_hint) |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 52 | { |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 53 | pid_t pid, ret; |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 54 | size_t len; |
Damien Miller | 637b8ae | 2001-11-12 11:05:20 +1100 | [diff] [blame] | 55 | char *pass; |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 56 | int p[2], status; |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 57 | char buf[1024]; |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 58 | void (*osigchld)(int); |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 59 | |
| 60 | if (fflush(stdout) != 0) |
djm@openbsd.org | 36eaa35 | 2019-12-06 02:55:21 +0000 | [diff] [blame] | 61 | error("%s: fflush: %s", __func__, strerror(errno)); |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 62 | if (askpass == NULL) |
| 63 | fatal("internal error: askpass undefined"); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 64 | if (pipe(p) == -1) { |
djm@openbsd.org | 36eaa35 | 2019-12-06 02:55:21 +0000 | [diff] [blame] | 65 | error("%s: pipe: %s", __func__, strerror(errno)); |
Damien Miller | 6c71179 | 2003-01-24 11:36:23 +1100 | [diff] [blame] | 66 | return NULL; |
Damien Miller | 07ab49e | 2001-07-14 12:19:56 +1000 | [diff] [blame] | 67 | } |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 68 | osigchld = signal(SIGCHLD, SIG_DFL); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 69 | if ((pid = fork()) == -1) { |
djm@openbsd.org | 36eaa35 | 2019-12-06 02:55:21 +0000 | [diff] [blame] | 70 | error("%s: fork: %s", __func__, strerror(errno)); |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 71 | signal(SIGCHLD, osigchld); |
Damien Miller | 6c71179 | 2003-01-24 11:36:23 +1100 | [diff] [blame] | 72 | return NULL; |
Damien Miller | 07ab49e | 2001-07-14 12:19:56 +1000 | [diff] [blame] | 73 | } |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 74 | if (pid == 0) { |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 75 | close(p[0]); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 76 | if (dup2(p[1], STDOUT_FILENO) == -1) |
djm@openbsd.org | 36eaa35 | 2019-12-06 02:55:21 +0000 | [diff] [blame] | 77 | fatal("%s: dup2: %s", __func__, strerror(errno)); |
djm@openbsd.org | 59175a3 | 2019-12-06 03:06:08 +0000 | [diff] [blame] | 78 | if (env_hint != NULL) |
| 79 | setenv("SSH_ASKPASS_PROMPT", env_hint, 1); |
mmcc@openbsd.org | 94141b7 | 2015-12-11 00:20:04 +0000 | [diff] [blame] | 80 | execlp(askpass, askpass, msg, (char *)NULL); |
djm@openbsd.org | 36eaa35 | 2019-12-06 02:55:21 +0000 | [diff] [blame] | 81 | fatal("%s: exec(%s): %s", __func__, askpass, strerror(errno)); |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 82 | } |
| 83 | close(p[1]); |
Damien Miller | f451e22 | 2002-01-22 23:05:31 +1100 | [diff] [blame] | 84 | |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 85 | len = 0; |
Damien Miller | f451e22 | 2002-01-22 23:05:31 +1100 | [diff] [blame] | 86 | do { |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 87 | ssize_t r = read(p[0], buf + len, sizeof(buf) - 1 - len); |
| 88 | |
| 89 | if (r == -1 && errno == EINTR) |
Damien Miller | f451e22 | 2002-01-22 23:05:31 +1100 | [diff] [blame] | 90 | continue; |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 91 | if (r <= 0) |
Damien Miller | f451e22 | 2002-01-22 23:05:31 +1100 | [diff] [blame] | 92 | break; |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 93 | len += r; |
Damien Miller | f451e22 | 2002-01-22 23:05:31 +1100 | [diff] [blame] | 94 | } while (sizeof(buf) - 1 - len > 0); |
| 95 | buf[len] = '\0'; |
| 96 | |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 97 | close(p[0]); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 98 | while ((ret = waitpid(pid, &status, 0)) == -1) |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 99 | if (errno != EINTR) |
| 100 | break; |
Damien Miller | 106079c | 2011-01-06 22:43:44 +1100 | [diff] [blame] | 101 | signal(SIGCHLD, osigchld); |
| 102 | if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 103 | explicit_bzero(buf, sizeof(buf)); |
Damien Miller | 6c71179 | 2003-01-24 11:36:23 +1100 | [diff] [blame] | 104 | return NULL; |
| 105 | } |
| 106 | |
Damien Miller | 637b8ae | 2001-11-12 11:05:20 +1100 | [diff] [blame] | 107 | buf[strcspn(buf, "\r\n")] = '\0'; |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 108 | pass = xstrdup(buf); |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 109 | explicit_bzero(buf, sizeof(buf)); |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 110 | return pass; |
| 111 | } |
| 112 | |
djm@openbsd.org | 59175a3 | 2019-12-06 03:06:08 +0000 | [diff] [blame] | 113 | /* private/internal read_passphrase flags */ |
| 114 | #define RP_ASK_PERMISSION 0x8000 /* pass hint to askpass for confirm UI */ |
| 115 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 116 | /* |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 117 | * Reads a passphrase from /dev/tty with echo turned off/on. Returns the |
| 118 | * passphrase (allocated with xmalloc). Exits if EOF is encountered. If |
| 119 | * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no |
| 120 | * tty is available |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 121 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 122 | char * |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 123 | read_passphrase(const char *prompt, int flags) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 124 | { |
tb@openbsd.org | 4ae7f80 | 2019-01-19 04:15:56 +0000 | [diff] [blame] | 125 | char cr = '\r', *askpass = NULL, *ret, buf[1024]; |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 126 | int rppflags, use_askpass = 0, ttyfd; |
djm@openbsd.org | 59175a3 | 2019-12-06 03:06:08 +0000 | [diff] [blame] | 127 | const char *askpass_hint = NULL; |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 128 | |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 129 | rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF; |
Damien Miller | 23f0770 | 2004-06-18 01:19:03 +1000 | [diff] [blame] | 130 | if (flags & RP_USE_ASKPASS) |
| 131 | use_askpass = 1; |
| 132 | else if (flags & RP_ALLOW_STDIN) { |
Damien Miller | d2ebd45 | 2005-05-26 12:07:47 +1000 | [diff] [blame] | 133 | if (!isatty(STDIN_FILENO)) { |
Damien Miller | ddeb752 | 2005-05-26 12:05:28 +1000 | [diff] [blame] | 134 | debug("read_passphrase: stdin is not a tty"); |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 135 | use_askpass = 1; |
Damien Miller | d2ebd45 | 2005-05-26 12:07:47 +1000 | [diff] [blame] | 136 | } |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 137 | } else { |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 138 | rppflags |= RPP_REQUIRE_TTY; |
Damien Miller | 85830d1 | 2002-01-22 23:24:51 +1100 | [diff] [blame] | 139 | ttyfd = open(_PATH_TTY, O_RDWR); |
tb@openbsd.org | 4ae7f80 | 2019-01-19 04:15:56 +0000 | [diff] [blame] | 140 | if (ttyfd >= 0) { |
| 141 | /* |
| 142 | * If we're on a tty, ensure that show the prompt at |
| 143 | * the beginning of the line. This will hopefully |
| 144 | * clobber any password characters the user has |
| 145 | * optimistically typed before echo is disabled. |
| 146 | */ |
| 147 | (void)write(ttyfd, &cr, 1); |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 148 | close(ttyfd); |
tb@openbsd.org | 4ae7f80 | 2019-01-19 04:15:56 +0000 | [diff] [blame] | 149 | } else { |
Damien Miller | ddeb752 | 2005-05-26 12:05:28 +1000 | [diff] [blame] | 150 | debug("read_passphrase: can't open %s: %s", _PATH_TTY, |
| 151 | strerror(errno)); |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 152 | use_askpass = 1; |
Damien Miller | ddeb752 | 2005-05-26 12:05:28 +1000 | [diff] [blame] | 153 | } |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 154 | } |
| 155 | |
Damien Miller | 23f0770 | 2004-06-18 01:19:03 +1000 | [diff] [blame] | 156 | if ((flags & RP_USE_ASKPASS) && getenv("DISPLAY") == NULL) |
| 157 | return (flags & RP_ALLOW_EOF) ? NULL : xstrdup(""); |
| 158 | |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 159 | if (use_askpass && getenv("DISPLAY")) { |
| 160 | if (getenv(SSH_ASKPASS_ENV)) |
| 161 | askpass = getenv(SSH_ASKPASS_ENV); |
| 162 | else |
| 163 | askpass = _PATH_SSH_ASKPASS_DEFAULT; |
djm@openbsd.org | 59175a3 | 2019-12-06 03:06:08 +0000 | [diff] [blame] | 164 | if ((flags & RP_ASK_PERMISSION) != 0) |
| 165 | askpass_hint = "confirm"; |
| 166 | if ((ret = ssh_askpass(askpass, prompt, askpass_hint)) == NULL) |
Damien Miller | 6c71179 | 2003-01-24 11:36:23 +1100 | [diff] [blame] | 167 | if (!(flags & RP_ALLOW_EOF)) |
| 168 | return xstrdup(""); |
| 169 | return ret; |
Ben Lindstrom | 5eb97b6 | 2001-04-19 20:33:07 +0000 | [diff] [blame] | 170 | } |
| 171 | |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 172 | if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) { |
| 173 | if (flags & RP_ALLOW_EOF) |
| 174 | return NULL; |
Ben Lindstrom | 4f42d8c | 2001-07-04 05:19:27 +0000 | [diff] [blame] | 175 | return xstrdup(""); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 176 | } |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 177 | |
| 178 | ret = xstrdup(buf); |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 179 | explicit_bzero(buf, sizeof(buf)); |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 180 | return ret; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 181 | } |
Darren Tucker | ce327b6 | 2004-11-05 20:38:03 +1100 | [diff] [blame] | 182 | |
| 183 | int |
| 184 | ask_permission(const char *fmt, ...) |
| 185 | { |
| 186 | va_list args; |
| 187 | char *p, prompt[1024]; |
| 188 | int allowed = 0; |
| 189 | |
| 190 | va_start(args, fmt); |
| 191 | vsnprintf(prompt, sizeof(prompt), fmt, args); |
| 192 | va_end(args); |
| 193 | |
djm@openbsd.org | 59175a3 | 2019-12-06 03:06:08 +0000 | [diff] [blame] | 194 | p = read_passphrase(prompt, |
| 195 | RP_USE_ASKPASS|RP_ALLOW_EOF|RP_ASK_PERMISSION); |
Darren Tucker | ce327b6 | 2004-11-05 20:38:03 +1100 | [diff] [blame] | 196 | if (p != NULL) { |
| 197 | /* |
| 198 | * Accept empty responses and responses consisting |
| 199 | * of the word "yes" as affirmative. |
| 200 | */ |
| 201 | if (*p == '\0' || *p == '\n' || |
| 202 | strcasecmp(p, "yes") == 0) |
| 203 | allowed = 1; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 204 | free(p); |
Darren Tucker | ce327b6 | 2004-11-05 20:38:03 +1100 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | return (allowed); |
| 208 | } |
djm@openbsd.org | 5d1c159 | 2019-11-12 22:34:20 +0000 | [diff] [blame] | 209 | |
| 210 | struct notifier_ctx { |
| 211 | pid_t pid; |
| 212 | void (*osigchld)(int); |
| 213 | }; |
| 214 | |
| 215 | struct notifier_ctx * |
| 216 | notify_start(int force_askpass, const char *fmt, ...) |
| 217 | { |
| 218 | va_list args; |
| 219 | char *prompt = NULL; |
| 220 | int devnull; |
| 221 | pid_t pid; |
| 222 | void (*osigchld)(int); |
| 223 | const char *askpass; |
| 224 | struct notifier_ctx *ret; |
| 225 | |
| 226 | va_start(args, fmt); |
| 227 | xvasprintf(&prompt, fmt, args); |
| 228 | va_end(args); |
| 229 | |
| 230 | if (fflush(NULL) != 0) |
| 231 | error("%s: fflush: %s", __func__, strerror(errno)); |
| 232 | if (!force_askpass && isatty(STDERR_FILENO)) { |
| 233 | (void)write(STDERR_FILENO, "\r", 1); |
| 234 | (void)write(STDERR_FILENO, prompt, strlen(prompt)); |
| 235 | (void)write(STDERR_FILENO, "\r\n", 2); |
| 236 | free(prompt); |
| 237 | return NULL; |
| 238 | } |
djm@openbsd.org | 018e290 | 2019-11-15 00:32:40 +0000 | [diff] [blame] | 239 | if ((askpass = getenv("SSH_ASKPASS")) == NULL) |
| 240 | askpass = _PATH_SSH_ASKPASS_DEFAULT; |
| 241 | if (getenv("DISPLAY") == NULL || *askpass == '\0') { |
djm@openbsd.org | 5d1c159 | 2019-11-12 22:34:20 +0000 | [diff] [blame] | 242 | debug3("%s: cannot notify", __func__); |
| 243 | free(prompt); |
| 244 | return NULL; |
| 245 | } |
| 246 | osigchld = signal(SIGCHLD, SIG_DFL); |
| 247 | if ((pid = fork()) == -1) { |
| 248 | error("%s: fork: %s", __func__, strerror(errno)); |
| 249 | signal(SIGCHLD, osigchld); |
| 250 | free(prompt); |
| 251 | return NULL; |
| 252 | } |
| 253 | if (pid == 0) { |
| 254 | if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) |
| 255 | fatal("%s: open %s", __func__, strerror(errno)); |
| 256 | if (dup2(devnull, STDIN_FILENO) == -1 || |
| 257 | dup2(devnull, STDOUT_FILENO) == -1) |
| 258 | fatal("%s: dup2: %s", __func__, strerror(errno)); |
| 259 | closefrom(STDERR_FILENO + 1); |
| 260 | setenv("SSH_ASKPASS_PROMPT", "none", 1); /* hint to UI */ |
| 261 | execlp(askpass, askpass, prompt, (char *)NULL); |
djm@openbsd.org | f79364b | 2019-11-27 05:00:17 +0000 | [diff] [blame] | 262 | error("%s: exec(%s): %s", __func__, askpass, strerror(errno)); |
| 263 | _exit(1); |
djm@openbsd.org | 5d1c159 | 2019-11-12 22:34:20 +0000 | [diff] [blame] | 264 | /* NOTREACHED */ |
| 265 | } |
| 266 | if ((ret = calloc(1, sizeof(*ret))) == NULL) { |
| 267 | kill(pid, SIGTERM); |
| 268 | fatal("%s: calloc failed", __func__); |
| 269 | } |
| 270 | ret->pid = pid; |
| 271 | ret->osigchld = osigchld; |
| 272 | free(prompt); |
| 273 | return ret; |
| 274 | } |
| 275 | |
| 276 | void |
| 277 | notify_complete(struct notifier_ctx *ctx) |
| 278 | { |
| 279 | int ret; |
| 280 | |
| 281 | if (ctx == NULL || ctx->pid <= 0) { |
| 282 | free(ctx); |
| 283 | return; |
| 284 | } |
| 285 | kill(ctx->pid, SIGTERM); |
| 286 | while ((ret = waitpid(ctx->pid, NULL, 0)) == -1) { |
| 287 | if (errno != EINTR) |
| 288 | break; |
| 289 | } |
| 290 | if (ret == -1) |
| 291 | fatal("%s: waitpid: %s", __func__, strerror(errno)); |
| 292 | signal(SIGCHLD, ctx->osigchld); |
| 293 | free(ctx); |
| 294 | } |