Annotation of src/usr.bin/ssh/readpass.c, Revision 1.25
1.1 deraadt 1: /*
1.8 deraadt 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.
1.6 deraadt 32: */
1.1 deraadt 33:
34: #include "includes.h"
1.25 ! markus 35: RCSID("$OpenBSD: readpass.c,v 1.24 2001/12/21 08:53:45 djm Exp $");
1.19 markus 36:
37: #include <readpassphrase.h>
1.1 deraadt 38:
39: #include "xmalloc.h"
1.14 itojun 40: #include "readpass.h"
1.15 markus 41: #include "pathnames.h"
42: #include "log.h"
43: #include "ssh.h"
44:
1.18 itojun 45: static char *
1.16 mouring 46: ssh_askpass(char *askpass, const char *msg)
1.15 markus 47: {
48: pid_t pid;
49: size_t len;
1.23 markus 50: char *pass;
1.24 djm 51: int p[2], status, ret;
1.15 markus 52: char buf[1024];
53:
54: if (fflush(stdout) != 0)
55: error("ssh_askpass: fflush: %s", strerror(errno));
56: if (askpass == NULL)
57: fatal("internal error: askpass undefined");
1.21 markus 58: if (pipe(p) < 0) {
59: error("ssh_askpass: pipe: %s", strerror(errno));
60: return xstrdup("");
61: }
62: if ((pid = fork()) < 0) {
63: error("ssh_askpass: fork: %s", strerror(errno));
64: return xstrdup("");
65: }
1.15 markus 66: if (pid == 0) {
67: seteuid(getuid());
68: setuid(getuid());
69: close(p[0]);
70: if (dup2(p[1], STDOUT_FILENO) < 0)
71: fatal("ssh_askpass: dup2: %s", strerror(errno));
72: execlp(askpass, askpass, msg, (char *) 0);
73: fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
74: }
75: close(p[1]);
1.24 djm 76:
77: len = ret = 0;
78: do {
79: ret = read(p[0], buf + len, sizeof(buf) - 1 - len);
80: if (ret == -1 && errno == EINTR)
81: continue;
82: if (ret <= 0)
83: break;
84: len += ret;
85: } while (sizeof(buf) - 1 - len > 0);
86: buf[len] = '\0';
87:
1.15 markus 88: close(p[0]);
89: while (waitpid(pid, &status, 0) < 0)
90: if (errno != EINTR)
91: break;
1.24 djm 92:
1.23 markus 93: buf[strcspn(buf, "\r\n")] = '\0';
1.15 markus 94: pass = xstrdup(buf);
95: memset(buf, 0, sizeof(buf));
96: return pass;
97: }
98:
1.7 markus 99: /*
1.19 markus 100: * Reads a passphrase from /dev/tty with echo turned off/on. Returns the
101: * passphrase (allocated with xmalloc). Exits if EOF is encountered. If
102: * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no
103: * tty is available
1.12 markus 104: */
1.5 markus 105: char *
1.19 markus 106: read_passphrase(const char *prompt, int flags)
1.1 deraadt 107: {
1.19 markus 108: char *askpass = NULL, *ret, buf[1024];
109: int rppflags, use_askpass = 0, ttyfd;
1.15 markus 110:
1.19 markus 111: rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF;
112: if (flags & RP_ALLOW_STDIN) {
1.15 markus 113: if (!isatty(STDIN_FILENO))
114: use_askpass = 1;
115: } else {
1.19 markus 116: rppflags |= RPP_REQUIRE_TTY;
1.25 ! markus 117: ttyfd = open(_PATH_TTY, O_RDWR);
1.15 markus 118: if (ttyfd >= 0)
119: close(ttyfd);
120: else
121: use_askpass = 1;
122: }
123:
124: if (use_askpass && getenv("DISPLAY")) {
125: if (getenv(SSH_ASKPASS_ENV))
126: askpass = getenv(SSH_ASKPASS_ENV);
127: else
128: askpass = _PATH_SSH_ASKPASS_DEFAULT;
129: return ssh_askpass(askpass, prompt);
130: }
131:
1.19 markus 132: if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL)
1.20 markus 133: return xstrdup("");
1.19 markus 134:
135: ret = xstrdup(buf);
136: memset(buf, 'x', sizeof buf);
137: return ret;
1.1 deraadt 138: }
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