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d74671e4 | 1 | /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */ |
2 | ||
510a42ce | 3 | /* $OpenBSD: readpassphrase.c,v 1.16 2003/06/17 21:56:23 millert Exp $ */ |
1656cbed | 4 | |
3159d49a | 5 | /* |
ac8802eb | 6 | * Copyright (c) 2000-2002 Todd C. Miller <Todd.Miller@courtesan.com> |
3159d49a | 7 | * |
510a42ce | 8 | * Permission to use, copy, modify, and distribute this software for any |
9 | * purpose with or without fee is hereby granted, provided that the above | |
10 | * copyright notice and this permission notice appear in all copies. | |
3159d49a | 11 | * |
510a42ce | 12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
13 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
14 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
15 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
16 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
17 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
18 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
19 | * | |
20 | * Sponsored in part by the Defense Advanced Research Projects | |
21 | * Agency (DARPA) and Air Force Research Laboratory, Air Force | |
22 | * Materiel Command, USAF, under agreement number F39502-99-1-0512. | |
3159d49a | 23 | */ |
24 | ||
25 | #if defined(LIBC_SCCS) && !defined(lint) | |
510a42ce | 26 | static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.16 2003/06/17 21:56:23 millert Exp $"; |
3159d49a | 27 | #endif /* LIBC_SCCS and not lint */ |
28 | ||
29 | #include "includes.h" | |
30 | ||
31 | #ifndef HAVE_READPASSPHRASE | |
32 | ||
33 | #include <termios.h> | |
34 | #include <readpassphrase.h> | |
35 | ||
36 | #ifdef TCSASOFT | |
37 | # define _T_FLUSH (TCSAFLUSH|TCSASOFT) | |
38 | #else | |
39 | # define _T_FLUSH (TCSAFLUSH) | |
40 | #endif | |
41 | ||
d321c94b | 42 | /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */ |
43 | #if !defined(_POSIX_VDISABLE) && defined(VDISABLE) | |
44 | # define _POSIX_VDISABLE VDISABLE | |
45 | #endif | |
46 | ||
1656cbed | 47 | static volatile sig_atomic_t signo; |
48 | ||
49 | static void handler(int); | |
50 | ||
3159d49a | 51 | char * |
1656cbed | 52 | readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) |
3159d49a | 53 | { |
1656cbed | 54 | ssize_t nr; |
55 | int input, output, save_errno; | |
3159d49a | 56 | char ch, *p, *end; |
1656cbed | 57 | struct termios term, oterm; |
ac8802eb | 58 | struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; |
59 | struct sigaction savetstp, savettin, savettou, savepipe; | |
3159d49a | 60 | |
61 | /* I suppose we could alloc on demand in this case (XXX). */ | |
62 | if (bufsiz == 0) { | |
63 | errno = EINVAL; | |
64 | return(NULL); | |
65 | } | |
66 | ||
1656cbed | 67 | restart: |
ac8802eb | 68 | signo = 0; |
3159d49a | 69 | /* |
70 | * Read and write to /dev/tty if available. If not, read from | |
71 | * stdin and write to stderr unless a tty is required. | |
72 | */ | |
ac8802eb | 73 | if ((flags & RPP_STDIN) || |
74 | (input = output = open(_PATH_TTY, O_RDWR)) == -1) { | |
3159d49a | 75 | if (flags & RPP_REQUIRE_TTY) { |
76 | errno = ENOTTY; | |
77 | return(NULL); | |
78 | } | |
79 | input = STDIN_FILENO; | |
80 | output = STDERR_FILENO; | |
81 | } | |
82 | ||
83 | /* | |
1656cbed | 84 | * Catch signals that would otherwise cause the user to end |
85 | * up with echo turned off in the shell. Don't worry about | |
ac8802eb | 86 | * things like SIGXCPU and SIGVTALRM for now. |
3159d49a | 87 | */ |
1656cbed | 88 | sigemptyset(&sa.sa_mask); |
89 | sa.sa_flags = 0; /* don't restart system calls */ | |
90 | sa.sa_handler = handler; | |
ac8802eb | 91 | (void)sigaction(SIGALRM, &sa, &savealrm); |
1656cbed | 92 | (void)sigaction(SIGHUP, &sa, &savehup); |
ac8802eb | 93 | (void)sigaction(SIGINT, &sa, &saveint); |
94 | (void)sigaction(SIGPIPE, &sa, &savepipe); | |
1656cbed | 95 | (void)sigaction(SIGQUIT, &sa, &savequit); |
96 | (void)sigaction(SIGTERM, &sa, &saveterm); | |
97 | (void)sigaction(SIGTSTP, &sa, &savetstp); | |
98 | (void)sigaction(SIGTTIN, &sa, &savettin); | |
99 | (void)sigaction(SIGTTOU, &sa, &savettou); | |
3159d49a | 100 | |
101 | /* Turn off echo if possible. */ | |
ac8802eb | 102 | if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { |
1656cbed | 103 | memcpy(&term, &oterm, sizeof(term)); |
104 | if (!(flags & RPP_ECHO_ON)) | |
105 | term.c_lflag &= ~(ECHO | ECHONL); | |
3159d49a | 106 | #ifdef VSTATUS |
1656cbed | 107 | if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) |
3159d49a | 108 | term.c_cc[VSTATUS] = _POSIX_VDISABLE; |
3159d49a | 109 | #endif |
110 | (void)tcsetattr(input, _T_FLUSH, &term); | |
1656cbed | 111 | } else { |
112 | memset(&term, 0, sizeof(term)); | |
ac8802eb | 113 | term.c_lflag |= ECHO; |
1656cbed | 114 | memset(&oterm, 0, sizeof(oterm)); |
ac8802eb | 115 | oterm.c_lflag |= ECHO; |
3159d49a | 116 | } |
117 | ||
ac8802eb | 118 | if (!(flags & RPP_STDIN)) |
119 | (void)write(output, prompt, strlen(prompt)); | |
3159d49a | 120 | end = buf + bufsiz - 1; |
1656cbed | 121 | for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) { |
3159d49a | 122 | if (p < end) { |
123 | if ((flags & RPP_SEVENBIT)) | |
0eb1a22d | 124 | ch &= 0x7f; |
3159d49a | 125 | if (isalpha(ch)) { |
126 | if ((flags & RPP_FORCELOWER)) | |
127 | ch = tolower(ch); | |
128 | if ((flags & RPP_FORCEUPPER)) | |
129 | ch = toupper(ch); | |
130 | } | |
131 | *p++ = ch; | |
132 | } | |
133 | } | |
134 | *p = '\0'; | |
1656cbed | 135 | save_errno = errno; |
136 | if (!(term.c_lflag & ECHO)) | |
137 | (void)write(output, "\n", 1); | |
138 | ||
139 | /* Restore old terminal settings and signals. */ | |
140 | if (memcmp(&term, &oterm, sizeof(term)) != 0) | |
969d6479 | 141 | (void)tcsetattr(input, _T_FLUSH, &oterm); |
ac8802eb | 142 | (void)sigaction(SIGALRM, &savealrm, NULL); |
1656cbed | 143 | (void)sigaction(SIGHUP, &savehup, NULL); |
ac8802eb | 144 | (void)sigaction(SIGINT, &saveint, NULL); |
1656cbed | 145 | (void)sigaction(SIGQUIT, &savequit, NULL); |
ac8802eb | 146 | (void)sigaction(SIGPIPE, &savepipe, NULL); |
1656cbed | 147 | (void)sigaction(SIGTERM, &saveterm, NULL); |
148 | (void)sigaction(SIGTSTP, &savetstp, NULL); | |
149 | (void)sigaction(SIGTTIN, &savettin, NULL); | |
3159d49a | 150 | if (input != STDIN_FILENO) |
151 | (void)close(input); | |
1656cbed | 152 | |
153 | /* | |
154 | * If we were interrupted by a signal, resend it to ourselves | |
155 | * now that we have restored the signal handlers. | |
156 | */ | |
157 | if (signo) { | |
ac8802eb | 158 | kill(getpid(), signo); |
1656cbed | 159 | switch (signo) { |
160 | case SIGTSTP: | |
161 | case SIGTTIN: | |
162 | case SIGTTOU: | |
1656cbed | 163 | goto restart; |
164 | } | |
165 | } | |
166 | ||
167 | errno = save_errno; | |
168 | return(nr == -1 ? NULL : buf); | |
3159d49a | 169 | } |
1656cbed | 170 | |
3159d49a | 171 | #if 0 |
172 | char * | |
1656cbed | 173 | getpass(const char *prompt) |
3159d49a | 174 | { |
175 | static char buf[_PASSWORD_LEN + 1]; | |
176 | ||
177 | return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); | |
178 | } | |
179 | #endif | |
1656cbed | 180 | |
181 | static void handler(int s) | |
182 | { | |
510a42ce | 183 | |
1656cbed | 184 | signo = s; |
185 | } | |
50903cc7 | 186 | #endif /* HAVE_READPASSPHRASE */ |