| | 1 | /* |
| | 2 | * Copyright (c) 1988, 1993 |
| | 3 | * The Regents of the University of California. All rights reserved. |
| | 4 | * |
| | 5 | * Redistribution and use in source and binary forms, with or without |
| | 6 | * modification, are permitted provided that the following conditions |
| | 7 | * are met: |
| | 8 | * 1. Redistributions of source code must retain the above copyright |
| | 9 | * notice, this list of conditions and the following disclaimer. |
| | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 11 | * notice, this list of conditions and the following disclaimer in the |
| | 12 | * documentation and/or other materials provided with the distribution. |
| | 13 | * 3. All advertising materials mentioning features or use of this software |
| | 14 | * must display the following acknowledgement: |
| | 15 | * This product includes software developed by the University of |
| | 16 | * California, Berkeley and its contributors. |
| | 17 | * 4. Neither the name of the University nor the names of its contributors |
| | 18 | * may be used to endorse or promote products derived from this software |
| | 19 | * without specific prior written permission. |
| | 20 | * |
| | 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 31 | * SUCH DAMAGE. |
| | 32 | */ |
| | 33 | |
| | 34 | #include "includes.h" |
| | 35 | RCSID("$OpenBSD: readpass.c,v 1.24 2001/12/21 08:53:45 djm Exp $"); |
| | 36 | |
| | 37 | #include "xmalloc.h" |
| | 38 | #include "readpass.h" |
| | 39 | #include "pathnames.h" |
| | 40 | #include "log.h" |
| | 41 | #include "ssh.h" |
| | 42 | |
| | 43 | static char * |
| | 44 | ssh_askpass(char *askpass, const char *msg) |
| | 45 | { |
| | 46 | pid_t pid; |
| | 47 | size_t len; |
| | 48 | char *pass; |
| | 49 | int p[2], status, ret; |
| | 50 | char buf[1024]; |
| | 51 | |
| | 52 | if (fflush(stdout) != 0) |
| | 53 | error("ssh_askpass: fflush: %s", strerror(errno)); |
| | 54 | if (askpass == NULL) |
| | 55 | fatal("internal error: askpass undefined"); |
| | 56 | if (pipe(p) < 0) { |
| | 57 | error("ssh_askpass: pipe: %s", strerror(errno)); |
| | 58 | return xstrdup(""); |
| | 59 | } |
| | 60 | if ((pid = fork()) < 0) { |
| | 61 | error("ssh_askpass: fork: %s", strerror(errno)); |
| | 62 | return xstrdup(""); |
| | 63 | } |
| | 64 | if (pid == 0) { |
| | 65 | seteuid(getuid()); |
| | 66 | setuid(getuid()); |
| | 67 | close(p[0]); |
| | 68 | if (dup2(p[1], STDOUT_FILENO) < 0) |
| | 69 | fatal("ssh_askpass: dup2: %s", strerror(errno)); |
| | 70 | execlp(askpass, askpass, msg, (char *) 0); |
| | 71 | fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno)); |
| | 72 | } |
| | 73 | close(p[1]); |
| | 74 | |
| | 75 | len = ret = 0; |
| | 76 | do { |
| | 77 | ret = read(p[0], buf + len, sizeof(buf) - 1 - len); |
| | 78 | if (ret == -1 && errno == EINTR) |
| | 79 | continue; |
| | 80 | if (ret <= 0) |
| | 81 | break; |
| | 82 | len += ret; |
| | 83 | } while (sizeof(buf) - 1 - len > 0); |
| | 84 | buf[len] = '\0'; |
| | 85 | |
| | 86 | close(p[0]); |
| | 87 | while (waitpid(pid, &status, 0) < 0) |
| | 88 | if (errno != EINTR) |
| | 89 | break; |
| | 90 | |
| | 91 | buf[strcspn(buf, "\r\n")] = '\0'; |
| | 92 | pass = xstrdup(buf); |
| | 93 | memset(buf, 0, sizeof(buf)); |
| | 94 | return pass; |
| | 95 | } |
| | 96 | |
| | 97 | /* |
| | 98 | * Reads a passphrase from /dev/tty with echo turned off/on. Returns the |
| | 99 | * passphrase (allocated with xmalloc). Exits if EOF is encountered. If |
| | 100 | * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no |
| | 101 | * tty is available |
| | 102 | */ |
| | 103 | char * |
| | 104 | read_passphrase(const char *prompt, int flags) |
| | 105 | { |
| | 106 | char *askpass = NULL, *ret, buf[1024]; |
| | 107 | int rppflags, use_askpass = 0, ttyfd; |
| | 108 | |
| | 109 | rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF; |
| | 110 | if (flags & RP_ALLOW_STDIN) { |
| | 111 | if (!isatty(STDIN_FILENO)) |
| | 112 | use_askpass = 1; |
| | 113 | } else { |
| | 114 | rppflags |= RPP_REQUIRE_TTY; |
| | 115 | ttyfd = open("/dev/tty", O_RDWR); |
| | 116 | if (ttyfd >= 0) |
| | 117 | close(ttyfd); |
| | 118 | else |
| | 119 | use_askpass = 1; |
| | 120 | } |
| | 121 | |
| | 122 | if (use_askpass && getenv("DISPLAY")) { |
| | 123 | if (getenv(SSH_ASKPASS_ENV)) |
| | 124 | askpass = getenv(SSH_ASKPASS_ENV); |
| | 125 | else |
| | 126 | askpass = _PATH_SSH_ASKPASS_DEFAULT; |
| | 127 | return ssh_askpass(askpass, prompt); |
| | 128 | } |
| | 129 | |
| | 130 | if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) |
| | 131 | return xstrdup(""); |
| | 132 | |
| | 133 | ret = xstrdup(buf); |
| | 134 | memset(buf, 'x', sizeof buf); |
| | 135 | return ret; |
| | 136 | } |
andersk / openssh.git / blame_incremental