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0fff78ff | 1 | /* $OpenBSD: readpassphrase.c,v 1.16 2003/06/17 21:56:23 millert Exp $ */ |
e9a17296 | 2 | |
3c0ef626 | 3 | /* |
41b2f314 | 4 | * Copyright (c) 2000-2002 Todd C. Miller <Todd.Miller@courtesan.com> |
3c0ef626 | 5 | * |
0fff78ff | 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. | |
3c0ef626 | 9 | * |
0fff78ff | 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. | |
3c0ef626 | 21 | */ |
22 | ||
23 | #if defined(LIBC_SCCS) && !defined(lint) | |
0fff78ff | 24 | static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.16 2003/06/17 21:56:23 millert Exp $"; |
3c0ef626 | 25 | #endif /* LIBC_SCCS and not lint */ |
26 | ||
27 | #include "includes.h" | |
28 | ||
29 | #ifndef HAVE_READPASSPHRASE | |
30 | ||
31 | #include <termios.h> | |
32 | #include <readpassphrase.h> | |
33 | ||
34 | #ifdef TCSASOFT | |
35 | # define _T_FLUSH (TCSAFLUSH|TCSASOFT) | |
36 | #else | |
37 | # define _T_FLUSH (TCSAFLUSH) | |
38 | #endif | |
39 | ||
40 | /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */ | |
41 | #if !defined(_POSIX_VDISABLE) && defined(VDISABLE) | |
42 | # define _POSIX_VDISABLE VDISABLE | |
43 | #endif | |
44 | ||
e9a17296 | 45 | static volatile sig_atomic_t signo; |
46 | ||
47 | static void handler(int); | |
48 | ||
3c0ef626 | 49 | char * |
e9a17296 | 50 | readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) |
3c0ef626 | 51 | { |
e9a17296 | 52 | ssize_t nr; |
53 | int input, output, save_errno; | |
3c0ef626 | 54 | char ch, *p, *end; |
e9a17296 | 55 | struct termios term, oterm; |
41b2f314 | 56 | struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; |
57 | struct sigaction savetstp, savettin, savettou, savepipe; | |
3c0ef626 | 58 | |
59 | /* I suppose we could alloc on demand in this case (XXX). */ | |
60 | if (bufsiz == 0) { | |
61 | errno = EINVAL; | |
62 | return(NULL); | |
63 | } | |
64 | ||
e9a17296 | 65 | restart: |
41b2f314 | 66 | signo = 0; |
3c0ef626 | 67 | /* |
68 | * Read and write to /dev/tty if available. If not, read from | |
69 | * stdin and write to stderr unless a tty is required. | |
70 | */ | |
41b2f314 | 71 | if ((flags & RPP_STDIN) || |
72 | (input = output = open(_PATH_TTY, O_RDWR)) == -1) { | |
3c0ef626 | 73 | if (flags & RPP_REQUIRE_TTY) { |
74 | errno = ENOTTY; | |
75 | return(NULL); | |
76 | } | |
77 | input = STDIN_FILENO; | |
78 | output = STDERR_FILENO; | |
79 | } | |
80 | ||
81 | /* | |
e9a17296 | 82 | * Catch signals that would otherwise cause the user to end |
83 | * up with echo turned off in the shell. Don't worry about | |
41b2f314 | 84 | * things like SIGXCPU and SIGVTALRM for now. |
3c0ef626 | 85 | */ |
e9a17296 | 86 | sigemptyset(&sa.sa_mask); |
87 | sa.sa_flags = 0; /* don't restart system calls */ | |
88 | sa.sa_handler = handler; | |
41b2f314 | 89 | (void)sigaction(SIGALRM, &sa, &savealrm); |
e9a17296 | 90 | (void)sigaction(SIGHUP, &sa, &savehup); |
41b2f314 | 91 | (void)sigaction(SIGINT, &sa, &saveint); |
92 | (void)sigaction(SIGPIPE, &sa, &savepipe); | |
e9a17296 | 93 | (void)sigaction(SIGQUIT, &sa, &savequit); |
94 | (void)sigaction(SIGTERM, &sa, &saveterm); | |
95 | (void)sigaction(SIGTSTP, &sa, &savetstp); | |
96 | (void)sigaction(SIGTTIN, &sa, &savettin); | |
97 | (void)sigaction(SIGTTOU, &sa, &savettou); | |
3c0ef626 | 98 | |
99 | /* Turn off echo if possible. */ | |
41b2f314 | 100 | if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { |
e9a17296 | 101 | memcpy(&term, &oterm, sizeof(term)); |
102 | if (!(flags & RPP_ECHO_ON)) | |
103 | term.c_lflag &= ~(ECHO | ECHONL); | |
3c0ef626 | 104 | #ifdef VSTATUS |
e9a17296 | 105 | if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) |
3c0ef626 | 106 | term.c_cc[VSTATUS] = _POSIX_VDISABLE; |
3c0ef626 | 107 | #endif |
108 | (void)tcsetattr(input, _T_FLUSH, &term); | |
e9a17296 | 109 | } else { |
110 | memset(&term, 0, sizeof(term)); | |
41b2f314 | 111 | term.c_lflag |= ECHO; |
e9a17296 | 112 | memset(&oterm, 0, sizeof(oterm)); |
41b2f314 | 113 | oterm.c_lflag |= ECHO; |
3c0ef626 | 114 | } |
115 | ||
41b2f314 | 116 | if (!(flags & RPP_STDIN)) |
117 | (void)write(output, prompt, strlen(prompt)); | |
3c0ef626 | 118 | end = buf + bufsiz - 1; |
e9a17296 | 119 | for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) { |
3c0ef626 | 120 | if (p < end) { |
121 | if ((flags & RPP_SEVENBIT)) | |
122 | ch &= 0x7f; | |
123 | if (isalpha(ch)) { | |
124 | if ((flags & RPP_FORCELOWER)) | |
125 | ch = tolower(ch); | |
126 | if ((flags & RPP_FORCEUPPER)) | |
127 | ch = toupper(ch); | |
128 | } | |
129 | *p++ = ch; | |
130 | } | |
131 | } | |
132 | *p = '\0'; | |
e9a17296 | 133 | save_errno = errno; |
134 | if (!(term.c_lflag & ECHO)) | |
135 | (void)write(output, "\n", 1); | |
136 | ||
137 | /* Restore old terminal settings and signals. */ | |
138 | if (memcmp(&term, &oterm, sizeof(term)) != 0) | |
139 | (void)tcsetattr(input, _T_FLUSH, &oterm); | |
41b2f314 | 140 | (void)sigaction(SIGALRM, &savealrm, NULL); |
e9a17296 | 141 | (void)sigaction(SIGHUP, &savehup, NULL); |
41b2f314 | 142 | (void)sigaction(SIGINT, &saveint, NULL); |
e9a17296 | 143 | (void)sigaction(SIGQUIT, &savequit, NULL); |
41b2f314 | 144 | (void)sigaction(SIGPIPE, &savepipe, NULL); |
e9a17296 | 145 | (void)sigaction(SIGTERM, &saveterm, NULL); |
146 | (void)sigaction(SIGTSTP, &savetstp, NULL); | |
147 | (void)sigaction(SIGTTIN, &savettin, NULL); | |
3c0ef626 | 148 | if (input != STDIN_FILENO) |
149 | (void)close(input); | |
e9a17296 | 150 | |
151 | /* | |
152 | * If we were interrupted by a signal, resend it to ourselves | |
153 | * now that we have restored the signal handlers. | |
154 | */ | |
155 | if (signo) { | |
41b2f314 | 156 | kill(getpid(), signo); |
e9a17296 | 157 | switch (signo) { |
158 | case SIGTSTP: | |
159 | case SIGTTIN: | |
160 | case SIGTTOU: | |
e9a17296 | 161 | goto restart; |
162 | } | |
163 | } | |
164 | ||
165 | errno = save_errno; | |
166 | return(nr == -1 ? NULL : buf); | |
3c0ef626 | 167 | } |
e9a17296 | 168 | |
3c0ef626 | 169 | #if 0 |
170 | char * | |
e9a17296 | 171 | getpass(const char *prompt) |
3c0ef626 | 172 | { |
173 | static char buf[_PASSWORD_LEN + 1]; | |
174 | ||
175 | return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); | |
176 | } | |
177 | #endif | |
e9a17296 | 178 | |
179 | static void handler(int s) | |
180 | { | |
0fff78ff | 181 | |
e9a17296 | 182 | signo = s; |
183 | } | |
700318f3 | 184 | #endif /* HAVE_READPASSPHRASE */ |