| File: | src/lib/libc/gen/readpassphrase.c |
| Warning: | line 58, column 2 Value stored to 'nr' is never read |
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| 1 | /* $OpenBSD: readpassphrase.c,v 1.27 2019/01/25 00:19:25 millert Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2000-2002, 2007, 2010 |
| 5 | * Todd C. Miller <millert@openbsd.org> |
| 6 | * |
| 7 | * Permission to use, copy, modify, and distribute this software for any |
| 8 | * purpose with or without fee is hereby granted, provided that the above |
| 9 | * copyright notice and this permission notice appear in all copies. |
| 10 | * |
| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 18 | * |
| 19 | * Sponsored in part by the Defense Advanced Research Projects |
| 20 | * Agency (DARPA) and Air Force Research Laboratory, Air Force |
| 21 | * Materiel Command, USAF, under agreement number F39502-99-1-0512. |
| 22 | */ |
| 23 | |
| 24 | #include <ctype.h> |
| 25 | #include <errno(*__errno()).h> |
| 26 | #include <fcntl.h> |
| 27 | #include <paths.h> |
| 28 | #include <pwd.h> |
| 29 | #include <signal.h> |
| 30 | #include <string.h> |
| 31 | #include <termios.h> |
| 32 | #include <unistd.h> |
| 33 | #include <readpassphrase.h> |
| 34 | |
| 35 | static volatile sig_atomic_t signo[_NSIG33]; |
| 36 | |
| 37 | static void handler(int); |
| 38 | |
| 39 | char * |
| 40 | readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) |
| 41 | { |
| 42 | ssize_t nr; |
| 43 | int input, output, save_errno, i, need_restart; |
| 44 | char ch, *p, *end; |
| 45 | struct termios term, oterm; |
| 46 | struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; |
| 47 | struct sigaction savetstp, savettin, savettou, savepipe; |
| 48 | |
| 49 | /* I suppose we could alloc on demand in this case (XXX). */ |
| 50 | if (bufsiz == 0) { |
| 51 | errno(*__errno()) = EINVAL22; |
| 52 | return(NULL((void *)0)); |
| 53 | } |
| 54 | |
| 55 | restart: |
| 56 | for (i = 0; i < _NSIG33; i++) |
| 57 | signo[i] = 0; |
| 58 | nr = -1; |
Value stored to 'nr' is never read | |
| 59 | save_errno = 0; |
| 60 | need_restart = 0; |
| 61 | /* |
| 62 | * Read and write to /dev/tty if available. If not, read from |
| 63 | * stdin and write to stderr unless a tty is required. |
| 64 | */ |
| 65 | if ((flags & RPP_STDIN0x20) || |
| 66 | (input = output = open(_PATH_TTY"/dev/tty", O_RDWR0x0002)) == -1) { |
| 67 | if (flags & RPP_REQUIRE_TTY0x02) { |
| 68 | errno(*__errno()) = ENOTTY25; |
| 69 | return(NULL((void *)0)); |
| 70 | } |
| 71 | input = STDIN_FILENO0; |
| 72 | output = STDERR_FILENO2; |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * Turn off echo if possible. |
| 77 | * If we are using a tty but are not the foreground pgrp this will |
| 78 | * generate SIGTTOU, so do it *before* installing the signal handlers. |
| 79 | */ |
| 80 | if (input != STDIN_FILENO0 && tcgetattr(input, &oterm) == 0) { |
| 81 | memcpy(&term, &oterm, sizeof(term)); |
| 82 | if (!(flags & RPP_ECHO_ON0x01)) |
| 83 | term.c_lflag &= ~(ECHO0x00000008 | ECHONL0x00000010); |
| 84 | if (term.c_cc[VSTATUS18] != _POSIX_VDISABLE(0377)) |
| 85 | term.c_cc[VSTATUS18] = _POSIX_VDISABLE(0377); |
| 86 | (void)tcsetattr(input, TCSAFLUSH2|TCSASOFT0x10, &term); |
| 87 | } else { |
| 88 | memset(&term, 0, sizeof(term)); |
| 89 | term.c_lflag |= ECHO0x00000008; |
| 90 | memset(&oterm, 0, sizeof(oterm)); |
| 91 | oterm.c_lflag |= ECHO0x00000008; |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * Catch signals that would otherwise cause the user to end |
| 96 | * up with echo turned off in the shell. Don't worry about |
| 97 | * things like SIGXCPU and SIGVTALRM for now. |
| 98 | */ |
| 99 | sigemptyset(&sa.sa_mask); |
| 100 | sa.sa_flags = 0; /* don't restart system calls */ |
| 101 | sa.sa_handler__sigaction_u.__sa_handler = handler; |
| 102 | (void)sigaction(SIGALRM14, &sa, &savealrm); |
| 103 | (void)sigaction(SIGHUP1, &sa, &savehup); |
| 104 | (void)sigaction(SIGINT2, &sa, &saveint); |
| 105 | (void)sigaction(SIGPIPE13, &sa, &savepipe); |
| 106 | (void)sigaction(SIGQUIT3, &sa, &savequit); |
| 107 | (void)sigaction(SIGTERM15, &sa, &saveterm); |
| 108 | (void)sigaction(SIGTSTP18, &sa, &savetstp); |
| 109 | (void)sigaction(SIGTTIN21, &sa, &savettin); |
| 110 | (void)sigaction(SIGTTOU22, &sa, &savettou); |
| 111 | |
| 112 | if (!(flags & RPP_STDIN0x20)) |
| 113 | (void)write(output, prompt, strlen(prompt)); |
| 114 | end = buf + bufsiz - 1; |
| 115 | p = buf; |
| 116 | while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') { |
| 117 | if (p < end) { |
| 118 | if ((flags & RPP_SEVENBIT0x10)) |
| 119 | ch &= 0x7f; |
| 120 | if (isalpha((unsigned char)ch)) { |
| 121 | if ((flags & RPP_FORCELOWER0x04)) |
| 122 | ch = (char)tolower((unsigned char)ch); |
| 123 | if ((flags & RPP_FORCEUPPER0x08)) |
| 124 | ch = (char)toupper((unsigned char)ch); |
| 125 | } |
| 126 | *p++ = ch; |
| 127 | } |
| 128 | } |
| 129 | *p = '\0'; |
| 130 | save_errno = errno(*__errno()); |
| 131 | if (!(term.c_lflag & ECHO0x00000008)) |
| 132 | (void)write(output, "\n", 1); |
| 133 | |
| 134 | /* Restore old terminal settings and signals. */ |
| 135 | if (memcmp(&term, &oterm, sizeof(term)) != 0) { |
| 136 | const int sigttou = signo[SIGTTOU22]; |
| 137 | |
| 138 | /* Ignore SIGTTOU generated when we are not the fg pgrp. */ |
| 139 | while (tcsetattr(input, TCSAFLUSH2|TCSASOFT0x10, &oterm) == -1 && |
| 140 | errno(*__errno()) == EINTR4 && !signo[SIGTTOU22]) |
| 141 | continue; |
| 142 | signo[SIGTTOU22] = sigttou; |
| 143 | } |
| 144 | (void)sigaction(SIGALRM14, &savealrm, NULL((void *)0)); |
| 145 | (void)sigaction(SIGHUP1, &savehup, NULL((void *)0)); |
| 146 | (void)sigaction(SIGINT2, &saveint, NULL((void *)0)); |
| 147 | (void)sigaction(SIGQUIT3, &savequit, NULL((void *)0)); |
| 148 | (void)sigaction(SIGPIPE13, &savepipe, NULL((void *)0)); |
| 149 | (void)sigaction(SIGTERM15, &saveterm, NULL((void *)0)); |
| 150 | (void)sigaction(SIGTSTP18, &savetstp, NULL((void *)0)); |
| 151 | (void)sigaction(SIGTTIN21, &savettin, NULL((void *)0)); |
| 152 | (void)sigaction(SIGTTOU22, &savettou, NULL((void *)0)); |
| 153 | if (input != STDIN_FILENO0) |
| 154 | (void)close(input); |
| 155 | |
| 156 | /* |
| 157 | * If we were interrupted by a signal, resend it to ourselves |
| 158 | * now that we have restored the signal handlers. |
| 159 | */ |
| 160 | for (i = 0; i < _NSIG33; i++) { |
| 161 | if (signo[i]) { |
| 162 | kill(getpid(), i); |
| 163 | switch (i) { |
| 164 | case SIGTSTP18: |
| 165 | case SIGTTIN21: |
| 166 | case SIGTTOU22: |
| 167 | need_restart = 1; |
| 168 | } |
| 169 | } |
| 170 | } |
| 171 | if (need_restart) |
| 172 | goto restart; |
| 173 | |
| 174 | if (save_errno) |
| 175 | errno(*__errno()) = save_errno; |
| 176 | return(nr == -1 ? NULL((void *)0) : buf); |
| 177 | } |
| 178 | DEF_WEAK(readpassphrase)__asm__(".weak " "readpassphrase" " ; " "readpassphrase" " = " "_libc_readpassphrase"); |
| 179 | |
| 180 | char * |
| 181 | getpass(const char *prompt) |
| 182 | { |
| 183 | static char buf[_PASSWORD_LEN128 + 1]; |
| 184 | |
| 185 | return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF0x00)); |
| 186 | } |
| 187 | |
| 188 | static void handler(int s) |
| 189 | { |
| 190 | |
| 191 | signo[s] = 1; |
| 192 | } |