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1 | /* $OpenBSD: readpassphrase.c,v 1.22 2010/01/13 10:20:54 dtucker Exp $ */ | |
2 | ||
3 | /* | |
4 | * Copyright (c) 2000-2002, 2007 Todd C. Miller <Todd.Miller@courtesan.com> | |
5 | * | |
6 | * Permission to use, copy, modify, and distribute this software for any | |
7 | * purpose with or without fee is hereby granted, provided that the above | |
8 | * copyright notice and this permission notice appear in all copies. | |
9 | * | |
10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | * | |
18 | * Sponsored in part by the Defense Advanced Research Projects | |
19 | * Agency (DARPA) and Air Force Research Laboratory, Air Force | |
20 | * Materiel Command, USAF, under agreement number F39502-99-1-0512. | |
21 | */ | |
22 | ||
23 | /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */ | |
24 | ||
25 | #include "includes.h" | |
26 | ||
27 | #ifndef HAVE_READPASSPHRASE | |
28 | ||
29 | #include <termios.h> | |
30 | #include <signal.h> | |
31 | #include <ctype.h> | |
32 | #include <fcntl.h> | |
33 | #include <readpassphrase.h> | |
34 | #include <errno.h> | |
35 | #include <string.h> | |
36 | #include <unistd.h> | |
37 | ||
38 | #ifdef TCSASOFT | |
39 | # define _T_FLUSH (TCSAFLUSH|TCSASOFT) | |
40 | #else | |
41 | # define _T_FLUSH (TCSAFLUSH) | |
42 | #endif | |
43 | ||
44 | /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */ | |
45 | #if !defined(_POSIX_VDISABLE) && defined(VDISABLE) | |
46 | # define _POSIX_VDISABLE VDISABLE | |
47 | #endif | |
48 | ||
49 | static volatile sig_atomic_t signo[_NSIG]; | |
50 | ||
51 | static void handler(int); | |
52 | ||
53 | char * | |
54 | readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) | |
55 | { | |
56 | ssize_t nr; | |
57 | int input, output, save_errno, i, need_restart; | |
58 | char ch, *p, *end; | |
59 | struct termios term, oterm; | |
60 | struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; | |
61 | struct sigaction savetstp, savettin, savettou, savepipe; | |
62 | ||
63 | /* I suppose we could alloc on demand in this case (XXX). */ | |
64 | if (bufsiz == 0) { | |
65 | errno = EINVAL; | |
66 | return(NULL); | |
67 | } | |
68 | ||
69 | restart: | |
70 | for (i = 0; i < _NSIG; i++) | |
71 | signo[i] = 0; | |
72 | nr = -1; | |
73 | save_errno = 0; | |
74 | need_restart = 0; | |
75 | /* | |
76 | * Read and write to /dev/tty if available. If not, read from | |
77 | * stdin and write to stderr unless a tty is required. | |
78 | */ | |
79 | if ((flags & RPP_STDIN) || | |
80 | (input = output = open(_PATH_TTY, O_RDWR)) == -1) { | |
81 | if (flags & RPP_REQUIRE_TTY) { | |
82 | errno = ENOTTY; | |
83 | return(NULL); | |
84 | } | |
85 | input = STDIN_FILENO; | |
86 | output = STDERR_FILENO; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Catch signals that would otherwise cause the user to end | |
91 | * up with echo turned off in the shell. Don't worry about | |
92 | * things like SIGXCPU and SIGVTALRM for now. | |
93 | */ | |
94 | sigemptyset(&sa.sa_mask); | |
95 | sa.sa_flags = 0; /* don't restart system calls */ | |
96 | sa.sa_handler = handler; | |
97 | (void)sigaction(SIGALRM, &sa, &savealrm); | |
98 | (void)sigaction(SIGHUP, &sa, &savehup); | |
99 | (void)sigaction(SIGINT, &sa, &saveint); | |
100 | (void)sigaction(SIGPIPE, &sa, &savepipe); | |
101 | (void)sigaction(SIGQUIT, &sa, &savequit); | |
102 | (void)sigaction(SIGTERM, &sa, &saveterm); | |
103 | (void)sigaction(SIGTSTP, &sa, &savetstp); | |
104 | (void)sigaction(SIGTTIN, &sa, &savettin); | |
105 | (void)sigaction(SIGTTOU, &sa, &savettou); | |
106 | ||
107 | /* Turn off echo if possible. */ | |
108 | if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { | |
109 | memcpy(&term, &oterm, sizeof(term)); | |
110 | if (!(flags & RPP_ECHO_ON)) | |
111 | term.c_lflag &= ~(ECHO | ECHONL); | |
112 | #ifdef VSTATUS | |
113 | if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) | |
114 | term.c_cc[VSTATUS] = _POSIX_VDISABLE; | |
115 | #endif | |
116 | (void)tcsetattr(input, _T_FLUSH, &term); | |
117 | } else { | |
118 | memset(&term, 0, sizeof(term)); | |
119 | term.c_lflag |= ECHO; | |
120 | memset(&oterm, 0, sizeof(oterm)); | |
121 | oterm.c_lflag |= ECHO; | |
122 | } | |
123 | ||
124 | /* No I/O if we are already backgrounded. */ | |
125 | if (signo[SIGTTOU] != 1 && signo[SIGTTIN] != 1) { | |
126 | if (!(flags & RPP_STDIN)) | |
127 | (void)write(output, prompt, strlen(prompt)); | |
128 | end = buf + bufsiz - 1; | |
129 | p = buf; | |
130 | while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') { | |
131 | if (p < end) { | |
132 | if ((flags & RPP_SEVENBIT)) | |
133 | ch &= 0x7f; | |
134 | if (isalpha(ch)) { | |
135 | if ((flags & RPP_FORCELOWER)) | |
136 | ch = (char)tolower(ch); | |
137 | if ((flags & RPP_FORCEUPPER)) | |
138 | ch = (char)toupper(ch); | |
139 | } | |
140 | *p++ = ch; | |
141 | } | |
142 | } | |
143 | *p = '\0'; | |
144 | save_errno = errno; | |
145 | if (!(term.c_lflag & ECHO)) | |
146 | (void)write(output, "\n", 1); | |
147 | } | |
148 | ||
149 | /* Restore old terminal settings and signals. */ | |
150 | if (memcmp(&term, &oterm, sizeof(term)) != 0) { | |
151 | while (tcsetattr(input, _T_FLUSH, &oterm) == -1 && | |
152 | errno == EINTR) | |
153 | continue; | |
154 | } | |
155 | (void)sigaction(SIGALRM, &savealrm, NULL); | |
156 | (void)sigaction(SIGHUP, &savehup, NULL); | |
157 | (void)sigaction(SIGINT, &saveint, NULL); | |
158 | (void)sigaction(SIGQUIT, &savequit, NULL); | |
159 | (void)sigaction(SIGPIPE, &savepipe, NULL); | |
160 | (void)sigaction(SIGTERM, &saveterm, NULL); | |
161 | (void)sigaction(SIGTSTP, &savetstp, NULL); | |
162 | (void)sigaction(SIGTTIN, &savettin, NULL); | |
163 | (void)sigaction(SIGTTOU, &savettou, NULL); | |
164 | if (input != STDIN_FILENO) | |
165 | (void)close(input); | |
166 | ||
167 | /* | |
168 | * If we were interrupted by a signal, resend it to ourselves | |
169 | * now that we have restored the signal handlers. | |
170 | */ | |
171 | for (i = 0; i < _NSIG; i++) { | |
172 | if (signo[i]) { | |
173 | kill(getpid(), i); | |
174 | switch (i) { | |
175 | case SIGTSTP: | |
176 | case SIGTTIN: | |
177 | case SIGTTOU: | |
178 | need_restart = 1; | |
179 | } | |
180 | } | |
181 | } | |
182 | if (need_restart) | |
183 | goto restart; | |
184 | ||
185 | if (save_errno) | |
186 | errno = save_errno; | |
187 | return(nr == -1 ? NULL : buf); | |
188 | } | |
189 | ||
190 | #if 0 | |
191 | char * | |
192 | getpass(const char *prompt) | |
193 | { | |
194 | static char buf[_PASSWORD_LEN + 1]; | |
195 | ||
196 | return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); | |
197 | } | |
198 | #endif | |
199 | ||
200 | static void handler(int s) | |
201 | { | |
202 | ||
203 | signo[s] = 1; | |
204 | } | |
205 | #endif /* HAVE_READPASSPHRASE */ |