]>
Commit | Line | Data |
---|---|---|
8efc0c15 | 1 | /* |
b984f12e | 2 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
2d86a6cc | 3 | * |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
2d86a6cc | 12 | * |
b984f12e | 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 23 | */ |
8efc0c15 | 24 | |
25 | #include "includes.h" | |
c4087616 | 26 | RCSID("$OpenBSD: readpass.c,v 1.28 2003/01/23 13:50:27 markus Exp $"); |
1843a425 | 27 | |
8efc0c15 | 28 | #include "xmalloc.h" |
5ca51e19 | 29 | #include "readpass.h" |
561e5254 | 30 | #include "pathnames.h" |
31 | #include "log.h" | |
561e5254 | 32 | #include "ssh.h" |
33 | ||
396c147e | 34 | static char * |
742ee8f2 | 35 | ssh_askpass(char *askpass, const char *msg) |
561e5254 | 36 | { |
37 | pid_t pid; | |
38 | size_t len; | |
56b551e2 | 39 | char *pass; |
f9654cd7 | 40 | int p[2], status, ret; |
561e5254 | 41 | char buf[1024]; |
42 | ||
43 | if (fflush(stdout) != 0) | |
44 | error("ssh_askpass: fflush: %s", strerror(errno)); | |
45 | if (askpass == NULL) | |
46 | fatal("internal error: askpass undefined"); | |
333b5ba7 | 47 | if (pipe(p) < 0) { |
48 | error("ssh_askpass: pipe: %s", strerror(errno)); | |
c4087616 | 49 | return NULL; |
333b5ba7 | 50 | } |
51 | if ((pid = fork()) < 0) { | |
52 | error("ssh_askpass: fork: %s", strerror(errno)); | |
c4087616 | 53 | return NULL; |
333b5ba7 | 54 | } |
561e5254 | 55 | if (pid == 0) { |
56 | seteuid(getuid()); | |
57 | setuid(getuid()); | |
58 | close(p[0]); | |
59 | if (dup2(p[1], STDOUT_FILENO) < 0) | |
60 | fatal("ssh_askpass: dup2: %s", strerror(errno)); | |
61 | execlp(askpass, askpass, msg, (char *) 0); | |
62 | fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno)); | |
63 | } | |
64 | close(p[1]); | |
f9654cd7 | 65 | |
66 | len = ret = 0; | |
67 | do { | |
68 | ret = read(p[0], buf + len, sizeof(buf) - 1 - len); | |
69 | if (ret == -1 && errno == EINTR) | |
70 | continue; | |
71 | if (ret <= 0) | |
72 | break; | |
73 | len += ret; | |
74 | } while (sizeof(buf) - 1 - len > 0); | |
75 | buf[len] = '\0'; | |
76 | ||
561e5254 | 77 | close(p[0]); |
78 | while (waitpid(pid, &status, 0) < 0) | |
79 | if (errno != EINTR) | |
80 | break; | |
f9654cd7 | 81 | |
c4087616 | 82 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
83 | memset(buf, 0, sizeof(buf)); | |
84 | return NULL; | |
85 | } | |
86 | ||
56b551e2 | 87 | buf[strcspn(buf, "\r\n")] = '\0'; |
561e5254 | 88 | pass = xstrdup(buf); |
89 | memset(buf, 0, sizeof(buf)); | |
90 | return pass; | |
91 | } | |
92 | ||
aa3378df | 93 | /* |
1843a425 | 94 | * Reads a passphrase from /dev/tty with echo turned off/on. Returns the |
95 | * passphrase (allocated with xmalloc). Exits if EOF is encountered. If | |
96 | * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no | |
97 | * tty is available | |
94ec8c6b | 98 | */ |
5260325f | 99 | char * |
1843a425 | 100 | read_passphrase(const char *prompt, int flags) |
8efc0c15 | 101 | { |
1843a425 | 102 | char *askpass = NULL, *ret, buf[1024]; |
103 | int rppflags, use_askpass = 0, ttyfd; | |
561e5254 | 104 | |
1843a425 | 105 | rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF; |
106 | if (flags & RP_ALLOW_STDIN) { | |
561e5254 | 107 | if (!isatty(STDIN_FILENO)) |
108 | use_askpass = 1; | |
109 | } else { | |
1843a425 | 110 | rppflags |= RPP_REQUIRE_TTY; |
a62ebe1f | 111 | ttyfd = open(_PATH_TTY, O_RDWR); |
561e5254 | 112 | if (ttyfd >= 0) |
113 | close(ttyfd); | |
114 | else | |
115 | use_askpass = 1; | |
116 | } | |
117 | ||
118 | if (use_askpass && getenv("DISPLAY")) { | |
119 | if (getenv(SSH_ASKPASS_ENV)) | |
120 | askpass = getenv(SSH_ASKPASS_ENV); | |
121 | else | |
122 | askpass = _PATH_SSH_ASKPASS_DEFAULT; | |
c4087616 | 123 | if ((ret = ssh_askpass(askpass, prompt)) == NULL) |
124 | if (!(flags & RP_ALLOW_EOF)) | |
125 | return xstrdup(""); | |
126 | return ret; | |
561e5254 | 127 | } |
128 | ||
67ec167d | 129 | if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) { |
130 | if (flags & RP_ALLOW_EOF) | |
131 | return NULL; | |
613021ac | 132 | return xstrdup(""); |
67ec167d | 133 | } |
1843a425 | 134 | |
135 | ret = xstrdup(buf); | |
136 | memset(buf, 'x', sizeof buf); | |
137 | return ret; | |
8efc0c15 | 138 | } |