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3c0ef626 | 1 | /* |
e9a17296 | 2 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
3c0ef626 | 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. | |
3c0ef626 | 12 | * |
e9a17296 | 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. | |
3c0ef626 | 23 | */ |
24 | ||
25 | #include "includes.h" | |
1c14df9e | 26 | RCSID("$OpenBSD: readpass.c,v 1.28 2003/01/23 13:50:27 markus Exp $"); |
3c0ef626 | 27 | |
28 | #include "xmalloc.h" | |
29 | #include "readpass.h" | |
30 | #include "pathnames.h" | |
31 | #include "log.h" | |
32 | #include "ssh.h" | |
33 | ||
34 | static char * | |
35 | ssh_askpass(char *askpass, const char *msg) | |
36 | { | |
37 | pid_t pid; | |
38 | size_t len; | |
39 | char *pass; | |
e9a17296 | 40 | int p[2], status, ret; |
3c0ef626 | 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"); | |
47 | if (pipe(p) < 0) { | |
48 | error("ssh_askpass: pipe: %s", strerror(errno)); | |
1c14df9e | 49 | return NULL; |
3c0ef626 | 50 | } |
51 | if ((pid = fork()) < 0) { | |
52 | error("ssh_askpass: fork: %s", strerror(errno)); | |
1c14df9e | 53 | return NULL; |
3c0ef626 | 54 | } |
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]); | |
e9a17296 | 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 | ||
3c0ef626 | 77 | close(p[0]); |
78 | while (waitpid(pid, &status, 0) < 0) | |
79 | if (errno != EINTR) | |
80 | break; | |
e9a17296 | 81 | |
1c14df9e | 82 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
83 | memset(buf, 0, sizeof(buf)); | |
84 | return NULL; | |
85 | } | |
86 | ||
3c0ef626 | 87 | buf[strcspn(buf, "\r\n")] = '\0'; |
88 | pass = xstrdup(buf); | |
89 | memset(buf, 0, sizeof(buf)); | |
90 | return pass; | |
91 | } | |
92 | ||
93 | /* | |
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 | |
98 | */ | |
99 | char * | |
100 | read_passphrase(const char *prompt, int flags) | |
101 | { | |
102 | char *askpass = NULL, *ret, buf[1024]; | |
103 | int rppflags, use_askpass = 0, ttyfd; | |
104 | ||
105 | rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF; | |
106 | if (flags & RP_ALLOW_STDIN) { | |
107 | if (!isatty(STDIN_FILENO)) | |
108 | use_askpass = 1; | |
109 | } else { | |
110 | rppflags |= RPP_REQUIRE_TTY; | |
e9a17296 | 111 | ttyfd = open(_PATH_TTY, O_RDWR); |
3c0ef626 | 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; | |
1c14df9e | 123 | if ((ret = ssh_askpass(askpass, prompt)) == NULL) |
124 | if (!(flags & RP_ALLOW_EOF)) | |
125 | return xstrdup(""); | |
126 | return ret; | |
3c0ef626 | 127 | } |
128 | ||
2980ea68 | 129 | if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) { |
130 | if (flags & RP_ALLOW_EOF) | |
131 | return NULL; | |
3c0ef626 | 132 | return xstrdup(""); |
2980ea68 | 133 | } |
3c0ef626 | 134 | |
135 | ret = xstrdup(buf); | |
136 | memset(buf, 'x', sizeof buf); | |
137 | return ret; | |
138 | } |