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1 | /* | |
2 | * Copyright (c) 1988, 1993 | |
3 | * The Regents of the University of California. All rights reserved. | |
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. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #include "includes.h" | |
35 | RCSID("$OpenBSD: readpass.c,v 1.22 2001/07/14 15:10:16 stevesk Exp $"); | |
36 | ||
37 | #include "xmalloc.h" | |
38 | #include "readpass.h" | |
39 | #include "pathnames.h" | |
40 | #include "log.h" | |
41 | #include "ssh.h" | |
42 | ||
43 | static char * | |
44 | ssh_askpass(char *askpass, const char *msg) | |
45 | { | |
46 | pid_t pid; | |
47 | size_t len; | |
48 | char *nl, *pass; | |
49 | int p[2], status; | |
50 | char buf[1024]; | |
51 | ||
52 | if (fflush(stdout) != 0) | |
53 | error("ssh_askpass: fflush: %s", strerror(errno)); | |
54 | if (askpass == NULL) | |
55 | fatal("internal error: askpass undefined"); | |
56 | if (pipe(p) < 0) { | |
57 | error("ssh_askpass: pipe: %s", strerror(errno)); | |
58 | return xstrdup(""); | |
59 | } | |
60 | if ((pid = fork()) < 0) { | |
61 | error("ssh_askpass: fork: %s", strerror(errno)); | |
62 | return xstrdup(""); | |
63 | } | |
64 | if (pid == 0) { | |
65 | seteuid(getuid()); | |
66 | setuid(getuid()); | |
67 | close(p[0]); | |
68 | if (dup2(p[1], STDOUT_FILENO) < 0) | |
69 | fatal("ssh_askpass: dup2: %s", strerror(errno)); | |
70 | execlp(askpass, askpass, msg, (char *) 0); | |
71 | fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno)); | |
72 | } | |
73 | close(p[1]); | |
74 | len = read(p[0], buf, sizeof buf); | |
75 | close(p[0]); | |
76 | while (waitpid(pid, &status, 0) < 0) | |
77 | if (errno != EINTR) | |
78 | break; | |
79 | if (len <= 1) | |
80 | return xstrdup(""); | |
81 | nl = strchr(buf, '\n'); | |
82 | if (nl) | |
83 | *nl = '\0'; | |
84 | pass = xstrdup(buf); | |
85 | memset(buf, 0, sizeof(buf)); | |
86 | return pass; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Reads a passphrase from /dev/tty with echo turned off/on. Returns the | |
91 | * passphrase (allocated with xmalloc). Exits if EOF is encountered. If | |
92 | * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no | |
93 | * tty is available | |
94 | */ | |
95 | char * | |
96 | read_passphrase(const char *prompt, int flags) | |
97 | { | |
98 | char *askpass = NULL, *ret, buf[1024]; | |
99 | int rppflags, use_askpass = 0, ttyfd; | |
100 | ||
101 | rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF; | |
102 | if (flags & RP_ALLOW_STDIN) { | |
103 | if (!isatty(STDIN_FILENO)) | |
104 | use_askpass = 1; | |
105 | } else { | |
106 | rppflags |= RPP_REQUIRE_TTY; | |
107 | ttyfd = open("/dev/tty", O_RDWR); | |
108 | if (ttyfd >= 0) | |
109 | close(ttyfd); | |
110 | else | |
111 | use_askpass = 1; | |
112 | } | |
113 | ||
114 | if (use_askpass && getenv("DISPLAY")) { | |
115 | if (getenv(SSH_ASKPASS_ENV)) | |
116 | askpass = getenv(SSH_ASKPASS_ENV); | |
117 | else | |
118 | askpass = _PATH_SSH_ASKPASS_DEFAULT; | |
119 | return ssh_askpass(askpass, prompt); | |
120 | } | |
121 | ||
122 | if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) | |
123 | return xstrdup(""); | |
124 | ||
125 | ret = xstrdup(buf); | |
126 | memset(buf, 'x', sizeof buf); | |
127 | return ret; | |
128 | } |