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1 | /* $OpenBSD: readpassphrase.c,v 1.18 2005/08/08 08:05:34 espie Exp $ */ | |
2 | ||
3 | /* | |
4 | * Copyright (c) 2000-2002 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; | |
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; | |
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 | signo = 0; | |
71 | /* | |
72 | * Read and write to /dev/tty if available. If not, read from | |
73 | * stdin and write to stderr unless a tty is required. | |
74 | */ | |
75 | if ((flags & RPP_STDIN) || | |
76 | (input = output = open(_PATH_TTY, O_RDWR)) == -1) { | |
77 | if (flags & RPP_REQUIRE_TTY) { | |
78 | errno = ENOTTY; | |
79 | return(NULL); | |
80 | } | |
81 | input = STDIN_FILENO; | |
82 | output = STDERR_FILENO; | |
83 | } | |
84 | ||
85 | /* | |
86 | * Catch signals that would otherwise cause the user to end | |
87 | * up with echo turned off in the shell. Don't worry about | |
88 | * things like SIGXCPU and SIGVTALRM for now. | |
89 | */ | |
90 | sigemptyset(&sa.sa_mask); | |
91 | sa.sa_flags = 0; /* don't restart system calls */ | |
92 | sa.sa_handler = handler; | |
93 | (void)sigaction(SIGALRM, &sa, &savealrm); | |
94 | (void)sigaction(SIGHUP, &sa, &savehup); | |
95 | (void)sigaction(SIGINT, &sa, &saveint); | |
96 | (void)sigaction(SIGPIPE, &sa, &savepipe); | |
97 | (void)sigaction(SIGQUIT, &sa, &savequit); | |
98 | (void)sigaction(SIGTERM, &sa, &saveterm); | |
99 | (void)sigaction(SIGTSTP, &sa, &savetstp); | |
100 | (void)sigaction(SIGTTIN, &sa, &savettin); | |
101 | (void)sigaction(SIGTTOU, &sa, &savettou); | |
102 | ||
103 | /* Turn off echo if possible. */ | |
104 | if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { | |
105 | memcpy(&term, &oterm, sizeof(term)); | |
106 | if (!(flags & RPP_ECHO_ON)) | |
107 | term.c_lflag &= ~(ECHO | ECHONL); | |
108 | #ifdef VSTATUS | |
109 | if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) | |
110 | term.c_cc[VSTATUS] = _POSIX_VDISABLE; | |
111 | #endif | |
112 | (void)tcsetattr(input, _T_FLUSH, &term); | |
113 | } else { | |
114 | memset(&term, 0, sizeof(term)); | |
115 | term.c_lflag |= ECHO; | |
116 | memset(&oterm, 0, sizeof(oterm)); | |
117 | oterm.c_lflag |= ECHO; | |
118 | } | |
119 | ||
120 | if (!(flags & RPP_STDIN)) | |
121 | (void)write(output, prompt, strlen(prompt)); | |
122 | end = buf + bufsiz - 1; | |
123 | for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) { | |
124 | if (p < end) { | |
125 | if ((flags & RPP_SEVENBIT)) | |
126 | ch &= 0x7f; | |
127 | if (isalpha(ch)) { | |
128 | if ((flags & RPP_FORCELOWER)) | |
129 | ch = tolower(ch); | |
130 | if ((flags & RPP_FORCEUPPER)) | |
131 | ch = toupper(ch); | |
132 | } | |
133 | *p++ = ch; | |
134 | } | |
135 | } | |
136 | *p = '\0'; | |
137 | save_errno = errno; | |
138 | if (!(term.c_lflag & ECHO)) | |
139 | (void)write(output, "\n", 1); | |
140 | ||
141 | /* Restore old terminal settings and signals. */ | |
142 | if (memcmp(&term, &oterm, sizeof(term)) != 0) { | |
143 | while (tcsetattr(input, _T_FLUSH, &oterm) == -1 && | |
144 | errno == EINTR) | |
145 | continue; | |
146 | } | |
147 | (void)sigaction(SIGALRM, &savealrm, NULL); | |
148 | (void)sigaction(SIGHUP, &savehup, NULL); | |
149 | (void)sigaction(SIGINT, &saveint, NULL); | |
150 | (void)sigaction(SIGQUIT, &savequit, NULL); | |
151 | (void)sigaction(SIGPIPE, &savepipe, NULL); | |
152 | (void)sigaction(SIGTERM, &saveterm, NULL); | |
153 | (void)sigaction(SIGTSTP, &savetstp, NULL); | |
154 | (void)sigaction(SIGTTIN, &savettin, NULL); | |
155 | (void)sigaction(SIGTTOU, &savettou, NULL); | |
156 | if (input != STDIN_FILENO) | |
157 | (void)close(input); | |
158 | ||
159 | /* | |
160 | * If we were interrupted by a signal, resend it to ourselves | |
161 | * now that we have restored the signal handlers. | |
162 | */ | |
163 | if (signo) { | |
164 | kill(getpid(), signo); | |
165 | switch (signo) { | |
166 | case SIGTSTP: | |
167 | case SIGTTIN: | |
168 | case SIGTTOU: | |
169 | goto restart; | |
170 | } | |
171 | } | |
172 | ||
173 | errno = save_errno; | |
174 | return(nr == -1 ? NULL : buf); | |
175 | } | |
176 | ||
177 | #if 0 | |
178 | char * | |
179 | getpass(const char *prompt) | |
180 | { | |
181 | static char buf[_PASSWORD_LEN + 1]; | |
182 | ||
183 | return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); | |
184 | } | |
185 | #endif | |
186 | ||
187 | static void handler(int s) | |
188 | { | |
189 | ||
190 | signo = s; | |
191 | } | |
192 | #endif /* HAVE_READPASSPHRASE */ |