Annotation of embedaddon/sudo/src/get_pty.c, revision 1.1.1.2
1.1 misho 1: /*
2: * Copyright (c) 2009-2011 Todd C. Miller <Todd.Miller@courtesan.com>
3: *
4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15: */
16:
17: #include <config.h>
18:
19: #include <sys/types.h>
20: #include <sys/param.h>
21: #include <sys/stat.h>
22: #include <sys/ioctl.h>
23: #ifdef HAVE_SYS_STROPTS_H
24: #include <sys/stropts.h>
25: #endif /* HAVE_SYS_STROPTS_H */
26: #include <stdio.h>
27: #ifdef STDC_HEADERS
28: # include <stdlib.h>
29: # include <stddef.h>
30: #else
31: # ifdef HAVE_STDLIB_H
32: # include <stdlib.h>
33: # endif
34: #endif /* STDC_HEADERS */
35: #ifdef HAVE_STRING_H
36: # include <string.h>
37: #endif /* HAVE_STRING_H */
38: #ifdef HAVE_STRINGS_H
39: # include <strings.h>
40: #endif /* HAVE_STRINGS_H */
41: #ifdef HAVE_UNISTD_H
42: # include <unistd.h>
43: #endif /* HAVE_UNISTD_H */
44: #include <errno.h>
45: #include <fcntl.h>
46: #include <grp.h>
47: #include <pwd.h>
48:
49: #if defined(HAVE_LIBUTIL_H)
50: # include <libutil.h>
51: #elif defined(HAVE_UTIL_H)
52: # include <util.h>
53: #endif
54: #ifdef HAVE_PTY_H
55: # include <pty.h>
56: #endif
57:
58: #include "sudo.h"
59:
60: #if defined(HAVE_OPENPTY)
61: int
62: get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
63: {
64: struct group *gr;
65: gid_t ttygid = -1;
1.1.1.2 ! misho 66: int rval = 0;
! 67: debug_decl(get_pty, SUDO_DEBUG_PTY)
1.1 misho 68:
69: if ((gr = getgrnam("tty")) != NULL)
70: ttygid = gr->gr_gid;
71:
1.1.1.2 ! misho 72: if (openpty(master, slave, name, NULL, NULL) == 0) {
! 73: if (chown(name, ttyuid, ttygid) == 0)
! 74: rval = 1;
! 75: }
! 76:
! 77: debug_return_bool(rval);
1.1 misho 78: }
79:
80: #elif defined(HAVE__GETPTY)
81: int
82: get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
83: {
84: char *line;
1.1.1.2 ! misho 85: int rval = 0;
! 86: debug_decl(get_pty, SUDO_DEBUG_PTY)
1.1 misho 87:
88: /* IRIX-style dynamic ptys (may fork) */
89: line = _getpty(master, O_RDWR, S_IRUSR|S_IWUSR|S_IWGRP, 0);
1.1.1.2 ! misho 90: if (line != NULL) {
! 91: *slave = open(line, O_RDWR|O_NOCTTY, 0);
! 92: if (*slave != -1) {
! 93: (void) chown(line, ttyuid, -1);
! 94: strlcpy(name, line, namesz);
! 95: rval = 1;
! 96: } else {
! 97: close(*master);
! 98: *master = -1;
! 99: }
1.1 misho 100: }
1.1.1.2 ! misho 101: debug_return_bool(rval);
1.1 misho 102: }
103: #elif defined(HAVE_GRANTPT)
104: # ifndef HAVE_POSIX_OPENPT
105: static int
106: posix_openpt(int oflag)
107: {
108: int fd;
109:
110: # ifdef _AIX
111: fd = open("/dev/ptc", oflag);
112: # else
113: fd = open("/dev/ptmx", oflag);
114: # endif
115: return fd;
116: }
117: # endif /* HAVE_POSIX_OPENPT */
118:
119: int
120: get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
121: {
122: char *line;
1.1.1.2 ! misho 123: int rval = 0;
! 124: debug_decl(get_pty, SUDO_DEBUG_PTY)
1.1 misho 125:
126: *master = posix_openpt(O_RDWR|O_NOCTTY);
1.1.1.2 ! misho 127: if (*master != -1) {
! 128: (void) grantpt(*master); /* may fork */
! 129: if (unlockpt(*master) != 0) {
! 130: close(*master);
! 131: goto done;
! 132: }
! 133: line = ptsname(*master);
! 134: if (line == NULL) {
! 135: close(*master);
! 136: goto done;
! 137: }
! 138: *slave = open(line, O_RDWR|O_NOCTTY, 0);
! 139: if (*slave == -1) {
! 140: close(*master);
! 141: goto done;
! 142: }
1.1 misho 143: # if defined(I_PUSH) && !defined(_AIX)
1.1.1.2 ! misho 144: ioctl(*slave, I_PUSH, "ptem"); /* pseudo tty emulation module */
! 145: ioctl(*slave, I_PUSH, "ldterm"); /* line discipline module */
1.1 misho 146: # endif
1.1.1.2 ! misho 147: (void) chown(line, ttyuid, -1);
! 148: strlcpy(name, line, namesz);
! 149: rval = 1;
! 150: }
! 151: done:
! 152: debug_return_bool(rval);
1.1 misho 153: }
154:
155: #else /* Old-style BSD ptys */
156:
157: static char line[] = "/dev/ptyXX";
158:
159: int
160: get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
161: {
162: char *bank, *cp;
163: struct group *gr;
164: gid_t ttygid = -1;
1.1.1.2 ! misho 165: int rval = 0;
! 166: debug_decl(get_pty, SUDO_DEBUG_PTY)
1.1 misho 167:
168: if ((gr = getgrnam("tty")) != NULL)
169: ttygid = gr->gr_gid;
170:
171: for (bank = "pqrs"; *bank != '\0'; bank++) {
172: line[sizeof("/dev/ptyX") - 2] = *bank;
173: for (cp = "0123456789abcdef"; *cp != '\0'; cp++) {
174: line[sizeof("/dev/ptyXX") - 2] = *cp;
175: *master = open(line, O_RDWR|O_NOCTTY, 0);
176: if (*master == -1) {
177: if (errno == ENOENT)
1.1.1.2 ! misho 178: goto done; /* out of ptys */
1.1 misho 179: continue; /* already in use */
180: }
181: line[sizeof("/dev/p") - 2] = 't';
182: (void) chown(line, ttyuid, ttygid);
183: (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
184: # ifdef HAVE_REVOKE
185: (void) revoke(line);
186: # endif
187: *slave = open(line, O_RDWR|O_NOCTTY, 0);
188: if (*slave != -1) {
189: strlcpy(name, line, namesz);
1.1.1.2 ! misho 190: rval = 1; /* success */
! 191: goto done;
1.1 misho 192: }
193: (void) close(*master);
194: }
195: }
1.1.1.2 ! misho 196: done:
! 197: debug_return(rval);
1.1 misho 198: }
199: #endif /* HAVE_OPENPTY */
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