Annotation of src/usr.bin/ssh/readpass.c, Revision 1.16
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"
1.16 ! mouring 35: RCSID("$OpenBSD: readpass.c,v 1.15 2001/04/18 21:57:41 markus Exp $");
1.1 deraadt 36:
37: #include "xmalloc.h"
1.12 markus 38: #include "cli.h"
1.14 itojun 39: #include "readpass.h"
1.15 markus 40: #include "pathnames.h"
41: #include "log.h"
42: #include "atomicio.h"
43: #include "ssh.h"
44:
45: char *
1.16 ! mouring 46: ssh_askpass(char *askpass, const char *msg)
1.15 markus 47: {
48: pid_t pid;
49: size_t len;
50: char *nl, *pass;
51: int p[2], status;
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");
58: if (pipe(p) < 0)
59: fatal("ssh_askpass: pipe: %s", strerror(errno));
60: if ((pid = fork()) < 0)
61: fatal("ssh_askpass: fork: %s", strerror(errno));
62: if (pid == 0) {
63: seteuid(getuid());
64: setuid(getuid());
65: close(p[0]);
66: if (dup2(p[1], STDOUT_FILENO) < 0)
67: fatal("ssh_askpass: dup2: %s", strerror(errno));
68: execlp(askpass, askpass, msg, (char *) 0);
69: fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
70: }
71: close(p[1]);
72: len = read(p[0], buf, sizeof buf);
73: close(p[0]);
74: while (waitpid(pid, &status, 0) < 0)
75: if (errno != EINTR)
76: break;
77: if (len <= 1)
78: return xstrdup("");
79: nl = strchr(buf, '\n');
80: if (nl)
81: *nl = '\0';
82: pass = xstrdup(buf);
83: memset(buf, 0, sizeof(buf));
84: return pass;
85: }
86:
1.9 deraadt 87:
1.7 markus 88: /*
89: * Reads a passphrase from /dev/tty with echo turned off. Returns the
1.8 deraadt 90: * passphrase (allocated with xmalloc), being very careful to ensure that
91: * no other userland buffer is storing the password.
1.7 markus 92: */
1.12 markus 93: /*
94: * Note: the funcationallity of this routing has been moved to
95: * cli_read_passphrase(). This routing remains to maintain
96: * compatibility with existing code.
97: */
1.5 markus 98: char *
1.12 markus 99: read_passphrase(char *prompt, int from_stdin)
1.1 deraadt 100: {
1.15 markus 101: char *askpass = NULL;
102: int use_askpass = 0, ttyfd;
103:
104: if (from_stdin) {
105: if (!isatty(STDIN_FILENO))
106: use_askpass = 1;
107: } else {
108: ttyfd = open("/dev/tty", O_RDWR);
109: if (ttyfd >= 0)
110: close(ttyfd);
111: else
112: use_askpass = 1;
113: }
114:
115: if (use_askpass && getenv("DISPLAY")) {
116: if (getenv(SSH_ASKPASS_ENV))
117: askpass = getenv(SSH_ASKPASS_ENV);
118: else
119: askpass = _PATH_SSH_ASKPASS_DEFAULT;
120: return ssh_askpass(askpass, prompt);
121: }
122:
1.12 markus 123: return cli_read_passphrase(prompt, from_stdin, 0);
1.1 deraadt 124: }