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1 | // This file is part of libptytty. Do not make local modifications. |
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2 | // http://software.schmorp.de/pkg/libptytty |
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3 | |
1 | /*--------------------------------*-C-*---------------------------------* |
4 | /*----------------------------------------------------------------------* |
2 | * File: ptytty.C |
5 | * File: ptytty.C |
3 | *----------------------------------------------------------------------* |
6 | *----------------------------------------------------------------------* |
4 | * |
7 | * |
5 | * All portions of code are copyright by their respective author/s. |
8 | * All portions of code are copyright by their respective author/s. |
6 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
9 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
7 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
10 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
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11 | * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
8 | * |
12 | * |
9 | * This program is free software; you can redistribute it and/or modify |
13 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by |
14 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 2 of the License, or |
15 | * the Free Software Foundation; either version 2 of the License, or |
12 | * (at your option) any later version. |
16 | * (at your option) any later version. |
… | |
… | |
19 | * You should have received a copy of the GNU General Public License |
23 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
24 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
22 | *---------------------------------------------------------------------*/ |
26 | *---------------------------------------------------------------------*/ |
23 | |
27 | |
24 | #include "../config.h" /* NECESSARY */ |
28 | #include "../config.h" |
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29 | |
25 | #include "rxvt.h" |
30 | #include "ptytty.h" |
26 | |
31 | |
27 | #include <cstdlib> |
32 | #include <cstdlib> |
28 | #include <cstring> |
33 | #include <cstring> |
29 | |
34 | |
30 | #include <sys/types.h> |
35 | #include <sys/types.h> |
… | |
… | |
33 | #include <fcntl.h> |
38 | #include <fcntl.h> |
34 | |
39 | |
35 | #ifdef HAVE_SYS_IOCTL_H |
40 | #ifdef HAVE_SYS_IOCTL_H |
36 | # include <sys/ioctl.h> |
41 | # include <sys/ioctl.h> |
37 | #endif |
42 | #endif |
38 | #if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
43 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
39 | # include <sys/stropts.h> /* for I_PUSH */ |
44 | # include <sys/stropts.h> /* for I_PUSH */ |
40 | #endif |
45 | #endif |
41 | #ifdef HAVE_ISASTREAM |
46 | #ifdef HAVE_ISASTREAM |
42 | # include <stropts.h> |
47 | # include <stropts.h> |
43 | #endif |
48 | #endif |
… | |
… | |
46 | #elif defined(HAVE_LIBUTIL_H) |
51 | #elif defined(HAVE_LIBUTIL_H) |
47 | # include <libutil.h> |
52 | # include <libutil.h> |
48 | #elif defined(HAVE_UTIL_H) |
53 | #elif defined(HAVE_UTIL_H) |
49 | # include <util.h> |
54 | # include <util.h> |
50 | #endif |
55 | #endif |
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56 | #ifdef TTY_GID_SUPPORT |
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57 | #include <grp.h> |
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58 | #endif |
51 | |
59 | |
52 | #include <cstdio> |
60 | #include <cstdio> |
53 | #include <grp.h> |
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54 | |
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55 | #include "rxvtutil.h" |
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56 | #include "fdpass.h" |
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57 | #include "ptytty.h" |
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58 | |
61 | |
59 | ///////////////////////////////////////////////////////////////////////////// |
62 | ///////////////////////////////////////////////////////////////////////////// |
60 | |
63 | |
61 | /* ------------------------------------------------------------------------- * |
64 | /* ------------------------------------------------------------------------- * |
62 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
65 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
… | |
… | |
64 | /* |
67 | /* |
65 | * Returns pty file descriptor, or -1 on failure |
68 | * Returns pty file descriptor, or -1 on failure |
66 | * If successful, ttydev is set to the name of the slave device. |
69 | * If successful, ttydev is set to the name of the slave device. |
67 | * fd_tty _may_ also be set to an open fd to the slave device |
70 | * fd_tty _may_ also be set to an open fd to the slave device |
68 | */ |
71 | */ |
69 | static inline int |
72 | #if defined(UNIX98_PTY) |
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73 | static int |
70 | get_pty_streams (int *fd_tty, char **ttydev) |
74 | get_pty (int *fd_tty, char **ttydev) |
71 | { |
75 | { |
72 | #ifdef NO_SETOWNER_TTYDEV |
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73 | int pfd; |
76 | int pfd; |
74 | |
77 | |
75 | # ifdef PTYS_ARE_GETPT |
78 | # if defined(HAVE_GETPT) |
76 | pfd = getpt(); |
79 | pfd = getpt(); |
77 | # else |
80 | # elif defined(HAVE_POSIX_OPENPT) |
78 | # ifdef PTYS_ARE_POSIX |
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79 | pfd = posix_openpt (O_RDWR); |
81 | pfd = posix_openpt (O_RDWR); |
80 | # else |
82 | # else |
81 | pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
83 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
82 | # endif |
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83 | # endif |
84 | # endif |
84 | if (pfd >= 0) |
85 | if (pfd >= 0) |
85 | { |
86 | { |
86 | if (grantpt (pfd) == 0 /* change slave permissions */ |
87 | if (grantpt (pfd) == 0 /* change slave permissions */ |
87 | && unlockpt (pfd) == 0) |
88 | && unlockpt (pfd) == 0) |
88 | { /* slave now unlocked */ |
89 | { /* slave now unlocked */ |
89 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
90 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
90 | return pfd; |
91 | return pfd; |
91 | } |
92 | } |
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93 | |
92 | close (pfd); |
94 | close (pfd); |
93 | } |
95 | } |
94 | #endif |
96 | |
95 | return -1; |
97 | return -1; |
96 | } |
98 | } |
97 | |
99 | #elif defined(HAVE_OPENPTY) |
98 | static inline int |
100 | static int |
99 | get_pty_openpty (int *fd_tty, char **ttydev) |
101 | get_pty (int *fd_tty, char **ttydev) |
100 | { |
102 | { |
101 | #ifdef PTYS_ARE_OPENPTY |
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102 | int pfd; |
103 | int pfd; |
103 | int res; |
104 | int res; |
104 | char tty_name[sizeof "/dev/pts/????\0"]; |
105 | char tty_name[32]; |
105 | |
106 | |
106 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
107 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
107 | if (res != -1) |
108 | if (res != -1) |
108 | { |
109 | { |
109 | *ttydev = strdup (tty_name); |
110 | *ttydev = strdup (tty_name); |
110 | return pfd; |
111 | return pfd; |
111 | } |
112 | } |
112 | #endif |
113 | |
113 | return -1; |
114 | return -1; |
114 | } |
115 | } |
115 | |
116 | #elif defined(HAVE__GETPTY) |
116 | static inline int |
117 | static int |
117 | get_pty__getpty (int *fd_tty, char **ttydev) |
118 | get_pty (int *fd_tty, char **ttydev) |
118 | { |
119 | { |
119 | #ifdef PTYS_ARE__GETPTY |
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120 | int pfd; |
120 | int pfd; |
121 | |
121 | |
122 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
122 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
123 | if (*ttydev != NULL) |
123 | if (*ttydev != NULL) |
124 | return pfd; |
124 | return pfd; |
125 | #endif |
125 | |
126 | return -1; |
126 | return -1; |
127 | } |
127 | } |
128 | |
128 | #elif defined(HAVE_DEV_PTC) |
129 | static inline int |
129 | static int |
130 | get_pty_ptc (int *fd_tty, char **ttydev) |
130 | get_pty (int *fd_tty, char **ttydev) |
131 | { |
131 | { |
132 | #ifdef PTYS_ARE_PTC |
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133 | int pfd; |
132 | int pfd; |
134 | |
133 | |
135 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
134 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
136 | { |
135 | { |
137 | *ttydev = strdup (ttyname (pfd)); |
136 | *ttydev = strdup (ttyname (pfd)); |
138 | return pfd; |
137 | return pfd; |
139 | } |
138 | } |
140 | #endif |
139 | |
141 | return -1; |
140 | return -1; |
142 | } |
141 | } |
143 | |
142 | #elif defined(HAVE_DEV_CLONE) |
144 | static inline int |
143 | static int |
145 | get_pty_clone (int *fd_tty, char **ttydev) |
144 | get_pty (int *fd_tty, char **ttydev) |
146 | { |
145 | { |
147 | #ifdef PTYS_ARE_CLONE |
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148 | int pfd; |
146 | int pfd; |
149 | |
147 | |
150 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
148 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
151 | { |
149 | { |
152 | *ttydev = strdup (ptsname (pfd)); |
150 | *ttydev = strdup (ptsname (pfd)); |
153 | return pfd; |
151 | return pfd; |
154 | } |
152 | } |
155 | #endif |
153 | |
156 | return -1; |
154 | return -1; |
157 | } |
155 | } |
158 | |
156 | #else |
159 | static inline int |
157 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
160 | get_pty_numeric (int *fd_tty, char **ttydev) |
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161 | { |
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162 | #ifdef PTYS_ARE_NUMERIC |
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163 | int pfd; |
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164 | int idx; |
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165 | char *c1, *c2; |
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166 | char pty_name[] = "/dev/ptyp???"; |
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167 | char tty_name[] = "/dev/ttyp???"; |
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168 | |
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169 | c1 = &(pty_name[sizeof (pty_name) - 4]); |
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170 | c2 = &(tty_name[sizeof (tty_name) - 4]); |
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171 | for (idx = 0; idx < 256; idx++) |
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172 | { |
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173 | sprintf (c1, "%d", idx); |
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174 | sprintf (c2, "%d", idx); |
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175 | if (access (tty_name, F_OK) < 0) |
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176 | { |
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177 | idx = 256; |
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178 | break; |
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179 | } |
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180 | |
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181 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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182 | { |
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183 | if (access (tty_name, R_OK | W_OK) == 0) |
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184 | { |
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185 | *ttydev = strdup (tty_name); |
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186 | return pfd; |
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187 | } |
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188 | |
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189 | close (pfd); |
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190 | } |
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191 | } |
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192 | #endif |
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193 | return -1; |
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194 | } |
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195 | |
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196 | static inline int |
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197 | get_pty_searched (int *fd_tty, char **ttydev) |
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198 | { |
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199 | #ifdef PTYS_ARE_SEARCHED |
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200 | # ifndef PTYCHAR1 |
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201 | # define PTYCHAR1 "pqrstuvwxyz" |
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202 | # endif |
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203 | # ifndef PTYCHAR2 |
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204 | # define PTYCHAR2 "0123456789abcdef" |
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205 | # endif |
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206 | int pfd; |
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207 | const char *c1, *c2; |
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208 | char pty_name[] = "/dev/pty??"; |
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209 | char tty_name[] = "/dev/tty??"; |
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210 | |
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211 | for (c1 = PTYCHAR1; *c1; c1++) |
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212 | { |
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213 | pty_name[ (sizeof (pty_name) - 3)] = |
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214 | tty_name[ (sizeof (pty_name) - 3)] = *c1; |
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215 | for (c2 = PTYCHAR2; *c2; c2++) |
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216 | { |
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217 | pty_name[ (sizeof (pty_name) - 2)] = |
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218 | tty_name[ (sizeof (pty_name) - 2)] = *c2; |
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219 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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220 | { |
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221 | if (access (tty_name, R_OK | W_OK) == 0) |
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222 | { |
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223 | *ttydev = strdup (tty_name); |
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224 | return pfd; |
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225 | } |
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226 | |
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227 | close (pfd); |
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228 | } |
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229 | } |
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230 | } |
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231 | #endif |
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232 | return -1; |
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233 | } |
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234 | |
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235 | static int |
158 | static int |
236 | get_pty (int *fd_tty, char **ttydev) |
159 | get_pty (int *fd_tty, char **ttydev) |
237 | { |
160 | { |
238 | int pfd; |
161 | int pfd; |
239 | |
162 | int i; |
240 | if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1 |
163 | char pty_name[32]; |
241 | || (pfd = get_pty_openpty (fd_tty, ttydev)) != -1 |
164 | char tty_name[32]; |
242 | || (pfd = get_pty__getpty (fd_tty, ttydev)) != -1 |
165 | const char *majors = "pqrstuvwxyzabcde"; |
243 | || (pfd = get_pty_ptc (fd_tty, ttydev)) != -1 |
166 | const char *minors = "0123456789abcdef"; |
244 | || (pfd = get_pty_clone (fd_tty, ttydev)) != -1 |
167 | for (i = 0; i < 256; i++) |
245 | || (pfd = get_pty_numeric (fd_tty, ttydev)) != -1 |
168 | { |
246 | || (pfd = get_pty_searched (fd_tty, ttydev)) != -1) |
169 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
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170 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
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171 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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172 | { |
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173 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
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174 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
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175 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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176 | continue; |
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177 | } |
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178 | if (access (tty_name, R_OK | W_OK) == 0) |
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179 | { |
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180 | *ttydev = strdup (tty_name); |
247 | return pfd; |
181 | return pfd; |
248 | return -1; |
182 | } |
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183 | |
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184 | close (pfd); |
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185 | } |
249 | } |
186 | } |
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187 | #endif |
250 | |
188 | |
251 | /*----------------------------------------------------------------------*/ |
189 | /*----------------------------------------------------------------------*/ |
252 | /* |
190 | /* |
253 | * Returns tty file descriptor, or -1 on failure |
191 | * Returns tty file descriptor, or -1 on failure |
254 | */ |
192 | */ |
… | |
… | |
263 | * Make our tty a controlling tty so that /dev/tty points to us |
201 | * Make our tty a controlling tty so that /dev/tty points to us |
264 | */ |
202 | */ |
265 | static int |
203 | static int |
266 | control_tty (int fd_tty) |
204 | control_tty (int fd_tty) |
267 | { |
205 | { |
268 | int fd; |
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269 | |
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270 | /* ---------------------------------------- */ |
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271 | setsid (); |
206 | setsid (); |
272 | |
207 | |
273 | /* ---------------------------------------- */ |
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274 | # if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
208 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
275 | /* |
209 | /* |
276 | * Push STREAMS modules: |
210 | * Push STREAMS modules: |
277 | * ptem: pseudo-terminal hardware emulation module. |
211 | * ptem: pseudo-terminal hardware emulation module. |
278 | * ldterm: standard terminal line discipline. |
212 | * ldterm: standard terminal line discipline. |
279 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
213 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
… | |
… | |
287 | * documentation is really unclear about whether it is any close () on |
221 | * documentation is really unclear about whether it is any close () on |
288 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
222 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
289 | * close () - on the master side which causes a hang up to be sent |
223 | * close () - on the master side which causes a hang up to be sent |
290 | * through - Geoff Wing |
224 | * through - Geoff Wing |
291 | */ |
225 | */ |
292 | # ifdef HAVE_ISASTREAM |
226 | # ifdef HAVE_ISASTREAM |
293 | if (isastream (fd_tty) == 1) |
227 | if (isastream (fd_tty) == 1) |
294 | # endif |
228 | # endif |
295 | { |
229 | { |
296 | ioctl (fd_tty, I_PUSH, "ptem"); |
230 | ioctl (fd_tty, I_PUSH, "ptem"); |
297 | ioctl (fd_tty, I_PUSH, "ldterm"); |
231 | ioctl (fd_tty, I_PUSH, "ldterm"); |
298 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
232 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
299 | } |
233 | } |
300 | # endif |
234 | #endif |
301 | /* ---------------------------------------- */ |
235 | |
302 | fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
236 | ioctl (fd_tty, TIOCSCTTY, NULL); |
303 | /* ---------------------------------------- */ |
237 | |
304 | fd = open ("/dev/tty", O_WRONLY); |
238 | int fd = open ("/dev/tty", O_WRONLY); |
305 | if (fd < 0) |
239 | if (fd < 0) |
306 | return -1; /* fatal */ |
240 | return -1; /* fatal */ |
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241 | |
307 | close (fd); |
242 | close (fd); |
308 | /* ---------------------------------------- */ |
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309 | |
243 | |
310 | return 0; |
244 | return 0; |
311 | } |
245 | } |
312 | |
246 | |
313 | void |
247 | void |
314 | rxvt_ptytty::close_tty () |
248 | ptytty::close_tty () |
315 | { |
249 | { |
316 | if (tty < 0) |
250 | if (tty < 0) |
317 | return; |
251 | return; |
318 | |
252 | |
319 | close (tty); |
253 | close (tty); |
320 | tty = -1; |
254 | tty = -1; |
321 | } |
255 | } |
322 | |
256 | |
323 | bool |
257 | bool |
324 | rxvt_ptytty::make_controlling_tty () |
258 | ptytty::make_controlling_tty () |
325 | { |
259 | { |
326 | return control_tty (tty) >= 0; |
260 | return control_tty (tty) >= 0; |
327 | } |
261 | } |
328 | |
262 | |
329 | void |
263 | void |
330 | rxvt_ptytty::set_utf8_mode (bool on) |
264 | ptytty::set_utf8_mode (bool on) |
331 | { |
265 | { |
332 | #ifdef IUTF8 |
266 | #ifdef IUTF8 |
333 | if (pty < 0) |
267 | if (pty < 0) |
334 | return; |
268 | return; |
335 | |
269 | |
… | |
… | |
351 | } |
285 | } |
352 | } |
286 | } |
353 | #endif |
287 | #endif |
354 | } |
288 | } |
355 | |
289 | |
356 | ///////////////////////////////////////////////////////////////////////////// |
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357 | |
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358 | #ifndef NO_SETOWNER_TTYDEV |
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359 | static struct ttyconf { |
290 | static struct ttyconf { |
360 | gid_t gid; |
291 | gid_t gid; |
361 | mode_t mode; |
292 | mode_t mode; |
362 | |
293 | |
363 | ttyconf () |
294 | ttyconf () |
… | |
… | |
372 | } |
303 | } |
373 | else |
304 | else |
374 | #endif /* TTY_GID_SUPPORT */ |
305 | #endif /* TTY_GID_SUPPORT */ |
375 | { |
306 | { |
376 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
307 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
377 | gid = getgid (); |
308 | gid = 0; |
378 | } |
309 | } |
379 | } |
310 | } |
380 | } ttyconf; |
311 | } ttyconf; |
381 | |
312 | |
382 | ///////////////////////////////////////////////////////////////////////////// |
313 | ptytty_unix::ptytty_unix () |
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314 | { |
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315 | name = 0; |
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316 | #if UTMP_SUPPORT |
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317 | cmd_pid = 0; |
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318 | #endif |
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319 | } |
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320 | |
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321 | ptytty_unix::~ptytty_unix () |
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322 | { |
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323 | #if UTMP_SUPPORT |
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324 | logout (); |
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325 | #endif |
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326 | put (); |
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327 | } |
383 | |
328 | |
384 | void |
329 | void |
385 | rxvt_ptytty_unix::privileges (rxvt_privaction action) |
330 | ptytty_unix::put () |
386 | { |
331 | { |
387 | if (!name || !*name) |
332 | chmod (name, RESTORE_TTY_MODE); |
388 | return; |
333 | chown (name, 0, ttyconf.gid); |
389 | |
334 | |
390 | if (action == SAVE) |
335 | close_tty (); |
391 | { |
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392 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
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393 | /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
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394 | if (lstat (name, &savestat) < 0) /* you lose out */ |
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395 | ; |
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396 | else |
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397 | # endif |
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398 | { |
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399 | saved = true; |
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400 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
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401 | chmod (name, ttyconf.mode); |
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402 | # ifdef HAVE_REVOKE |
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403 | revoke (name); |
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404 | # endif |
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405 | } |
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406 | } |
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407 | else |
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408 | { /* action == RESTORE */ |
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409 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
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410 | if (saved) |
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411 | { |
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412 | chmod (name, savestat.st_mode); |
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413 | chown (name, savestat.st_uid, savestat.st_gid); |
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414 | } |
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415 | # else |
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416 | chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
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417 | chown (name, 0, 0); |
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418 | # endif |
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419 | |
336 | |
420 | } |
337 | if (pty >= 0) |
421 | } |
338 | close (pty); |
422 | #endif |
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423 | |
339 | |
424 | rxvt_ptytty_unix::rxvt_ptytty_unix () |
340 | free (name); |
425 | { |
341 | |
426 | pty = tty = -1; |
342 | pty = tty = -1; |
427 | name = 0; |
343 | name = 0; |
428 | #ifndef NO_SETOWNER_TTYDEV |
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429 | saved = false; |
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430 | #endif |
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431 | #if UTMP_SUPPORT |
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432 | cmd_pid = 0; |
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433 | #endif |
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434 | } |
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435 | |
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436 | rxvt_ptytty_unix::~rxvt_ptytty_unix () |
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437 | { |
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438 | #if UTMP_SUPPORT |
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439 | logout (); |
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440 | #endif |
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441 | put (); |
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442 | } |
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443 | |
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444 | void |
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445 | rxvt_ptytty_unix::put () |
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446 | { |
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447 | #ifndef NO_SETOWNER_TTYDEV |
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448 | privileges (RESTORE); |
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449 | #endif |
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450 | |
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451 | if (pty >= 0) close (pty); |
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452 | close_tty (); |
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453 | free (name); |
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454 | |
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455 | pty = tty = -1; |
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456 | name = 0; |
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457 | } |
344 | } |
458 | |
345 | |
459 | bool |
346 | bool |
460 | rxvt_ptytty_unix::get () |
347 | ptytty_unix::get () |
461 | { |
348 | { |
462 | /* get master (pty) */ |
349 | /* get master (pty) */ |
463 | if ((pty = get_pty (&tty, &name)) < 0) |
350 | if ((pty = get_pty (&tty, &name)) < 0) |
464 | return false; |
351 | return false; |
465 | |
352 | |
… | |
… | |
467 | |
354 | |
468 | /* get slave (tty) */ |
355 | /* get slave (tty) */ |
469 | if (tty < 0) |
356 | if (tty < 0) |
470 | { |
357 | { |
471 | #ifndef NO_SETOWNER_TTYDEV |
358 | #ifndef NO_SETOWNER_TTYDEV |
472 | privileges (SAVE); |
359 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
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360 | chmod (name, ttyconf.mode); |
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361 | # ifdef HAVE_REVOKE |
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362 | revoke (name); |
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363 | # endif |
473 | #endif |
364 | #endif |
474 | |
365 | |
475 | if ((tty = get_tty (name)) < 0) |
366 | if ((tty = get_tty (name)) < 0) |
476 | { |
367 | { |
477 | put (); |
368 | put (); |
… | |
… | |
482 | return true; |
373 | return true; |
483 | } |
374 | } |
484 | |
375 | |
485 | #if PTYTTY_HELPER |
376 | #if PTYTTY_HELPER |
486 | |
377 | |
487 | static int sock_fd; |
378 | static int sock_fd = -1; |
488 | static int pid; |
379 | static int helper_pid, owner_pid; |
489 | |
380 | |
490 | struct command |
381 | struct command |
491 | { |
382 | { |
492 | enum { get, login, destroy } type; |
383 | enum { get, login, destroy } type; |
493 | |
384 | |
494 | rxvt_ptytty *id; |
385 | ptytty *id; |
495 | |
386 | |
496 | bool login_shell; |
387 | bool login_shell; |
497 | int cmd_pid; |
388 | int cmd_pid; |
498 | char hostname[512]; // arbitrary, but should be plenty |
389 | char hostname[512]; // arbitrary, but should be plenty |
499 | }; |
390 | }; |
500 | |
391 | |
501 | struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty |
392 | struct ptytty_proxy : ptytty |
502 | { |
393 | { |
503 | rxvt_ptytty *id; |
394 | ptytty *id; |
504 | |
395 | |
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396 | ptytty_proxy () |
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397 | : id(0) |
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398 | { |
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399 | } |
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400 | |
505 | ~rxvt_ptytty_proxy (); |
401 | ~ptytty_proxy (); |
506 | |
402 | |
507 | bool get (); |
403 | bool get (); |
508 | void login (int cmd_pid, bool login_shell, const char *hostname); |
404 | void login (int cmd_pid, bool login_shell, const char *hostname); |
509 | }; |
405 | }; |
510 | |
406 | |
511 | bool |
407 | bool |
512 | rxvt_ptytty_proxy::get () |
408 | ptytty_proxy::get () |
513 | { |
409 | { |
514 | command cmd; |
410 | command cmd; |
515 | |
411 | |
516 | cmd.type = command::get; |
412 | cmd.type = command::get; |
517 | |
413 | |
518 | write (sock_fd, &cmd, sizeof (cmd)); |
414 | write (sock_fd, &cmd, sizeof (cmd)); |
519 | |
415 | |
520 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
416 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
521 | rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
417 | ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
522 | |
418 | |
523 | if (!id) |
419 | if (!id) |
524 | return false; |
420 | return false; |
525 | |
421 | |
526 | if ((pty = rxvt_recv_fd (sock_fd)) < 0 |
422 | if ((pty = recv_fd (sock_fd)) < 0 |
527 | || (tty = rxvt_recv_fd (sock_fd)) < 0) |
423 | || (tty = recv_fd (sock_fd)) < 0) |
528 | rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
424 | ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
529 | |
425 | |
530 | return true; |
426 | return true; |
531 | } |
427 | } |
532 | |
428 | |
533 | void |
429 | void |
534 | rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
430 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
535 | { |
431 | { |
536 | command cmd; |
432 | command cmd; |
537 | |
433 | |
538 | cmd.type = command::login; |
434 | cmd.type = command::login; |
539 | cmd.id = id; |
435 | cmd.id = id; |
… | |
… | |
542 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
438 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
543 | |
439 | |
544 | write (sock_fd, &cmd, sizeof (cmd)); |
440 | write (sock_fd, &cmd, sizeof (cmd)); |
545 | } |
441 | } |
546 | |
442 | |
547 | rxvt_ptytty_proxy::~rxvt_ptytty_proxy () |
443 | ptytty_proxy::~ptytty_proxy () |
548 | { |
444 | { |
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445 | if (id) |
|
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446 | { |
549 | command cmd; |
447 | command cmd; |
550 | |
448 | |
551 | cmd.type = command::destroy; |
449 | cmd.type = command::destroy; |
552 | cmd.id = id; |
450 | cmd.id = id; |
553 | |
451 | |
554 | write (sock_fd, &cmd, sizeof (cmd)); |
452 | write (sock_fd, &cmd, sizeof (cmd)); |
|
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453 | } |
555 | } |
454 | } |
556 | |
455 | |
557 | static |
456 | static |
558 | void serve () |
457 | void serve () |
559 | { |
458 | { |
560 | command cmd; |
459 | command cmd; |
561 | vector<rxvt_ptytty *> ptys; |
460 | vector<ptytty *> ptys; |
562 | |
461 | |
563 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
462 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
564 | { |
463 | { |
565 | if (cmd.type == command::get) |
464 | if (cmd.type == command::get) |
566 | { |
465 | { |
567 | // -> id ptyfd ttyfd |
466 | // -> id ptyfd ttyfd |
568 | cmd.id = new rxvt_ptytty_unix; |
467 | cmd.id = new ptytty_unix; |
569 | |
468 | |
570 | if (cmd.id->get ()) |
469 | if (cmd.id->get ()) |
571 | { |
470 | { |
572 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
471 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
573 | ptys.push_back (cmd.id); |
472 | ptys.push_back (cmd.id); |
574 | |
473 | |
575 | rxvt_send_fd (sock_fd, cmd.id->pty); |
474 | ptytty::send_fd (sock_fd, cmd.id->pty); |
576 | rxvt_send_fd (sock_fd, cmd.id->tty); |
475 | ptytty::send_fd (sock_fd, cmd.id->tty); |
577 | } |
476 | } |
578 | else |
477 | else |
579 | { |
478 | { |
580 | delete cmd.id; |
479 | delete cmd.id; |
581 | cmd.id = 0; |
480 | cmd.id = 0; |
… | |
… | |
592 | } |
491 | } |
593 | #endif |
492 | #endif |
594 | } |
493 | } |
595 | else if (cmd.type == command::destroy) |
494 | else if (cmd.type == command::destroy) |
596 | { |
495 | { |
597 | rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id); |
496 | vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id); |
598 | |
497 | |
599 | if (pty) |
498 | if (pty != ptys.end ()) |
600 | { |
499 | { |
601 | delete *pty; |
500 | delete *pty; |
602 | ptys.erase (pty); |
501 | ptys.erase (pty); |
603 | } |
502 | } |
604 | } |
503 | } |
605 | else |
504 | else |
606 | break; |
505 | break; |
607 | } |
506 | } |
608 | |
507 | |
609 | // destroy all ptys |
508 | // destroy all ptys |
610 | for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); ) |
509 | for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); ) |
611 | delete *i; |
510 | delete *i; |
612 | } |
511 | } |
613 | |
512 | |
614 | void rxvt_ptytty_server () |
513 | void |
|
|
514 | ptytty::use_helper () |
615 | { |
515 | { |
|
|
516 | int pid = getpid (); |
|
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517 | |
|
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518 | if (sock_fd >= 0 && pid == owner_pid) |
|
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519 | return; |
|
|
520 | |
|
|
521 | owner_pid = pid; |
|
|
522 | |
616 | int sv[2]; |
523 | int sv[2]; |
617 | |
524 | |
618 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
525 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
619 | rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
526 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
620 | |
527 | |
621 | pid = fork (); |
528 | helper_pid = fork (); |
622 | |
529 | |
623 | if (pid < 0) |
530 | if (helper_pid < 0) |
624 | rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
531 | ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
625 | |
532 | |
626 | if (pid) |
533 | if (helper_pid) |
627 | { |
534 | { |
628 | // client, urxvt |
535 | // client, process |
629 | sock_fd = sv[0]; |
536 | sock_fd = sv[0]; |
630 | close (sv[1]); |
537 | close (sv[1]); |
631 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
538 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
632 | } |
539 | } |
633 | else |
540 | else |
634 | { |
541 | { |
635 | setgid (getegid ()); |
|
|
636 | setuid (geteuid ()); |
|
|
637 | |
|
|
638 | // server, pty-helper |
542 | // server, pty-helper |
639 | sock_fd = sv[1]; |
543 | sock_fd = sv[1]; |
640 | |
544 | |
|
|
545 | chdir ("/"); |
|
|
546 | |
641 | for (int fd = 0; fd < 1023; fd++) |
547 | for (int fd = 0; fd < 1023; fd++) |
642 | if (fd != sock_fd && fd != 1) |
548 | if (fd != sock_fd) |
643 | close (fd); |
549 | close (fd); |
644 | |
550 | |
645 | serve (); |
551 | serve (); |
646 | _exit (EXIT_SUCCESS); |
552 | _exit (EXIT_SUCCESS); |
647 | } |
553 | } |
648 | } |
554 | } |
649 | #endif |
|
|
650 | |
555 | |
651 | // a "factory" *g* |
556 | #endif |
|
|
557 | |
652 | rxvt_ptytty * |
558 | ptytty * |
653 | rxvt_new_ptytty () |
559 | ptytty::create () |
654 | { |
560 | { |
655 | #if PTYTTY_HELPER |
561 | #if PTYTTY_HELPER |
656 | if (pid > 0) |
562 | if (helper_pid && getpid () == owner_pid) |
657 | // use helper process |
563 | // use helper process |
658 | return new rxvt_ptytty_proxy; |
564 | return new ptytty_proxy; |
659 | else |
565 | else |
660 | #endif |
566 | #endif |
661 | return new rxvt_ptytty_unix; |
567 | return new ptytty_unix; |
662 | } |
568 | } |
663 | |
569 | |
664 | /*----------------------- end-of-file (C source) -----------------------*/ |
570 | void |
|
|
571 | ptytty::init () |
|
|
572 | { |
|
|
573 | uid_t uid = getuid (); |
|
|
574 | gid_t gid = getgid (); |
|
|
575 | |
|
|
576 | // before doing anything else, check for setuid/setgid operation, |
|
|
577 | // start the helper process and drop privileges |
|
|
578 | if (uid != geteuid () |
|
|
579 | || gid != getegid ()) |
|
|
580 | { |
|
|
581 | #if PTYTTY_HELPER |
|
|
582 | use_helper (); |
|
|
583 | #else |
|
|
584 | ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n"); |
|
|
585 | #endif |
665 | |
586 | |
|
|
587 | drop_privileges (); |
|
|
588 | } |
|
|
589 | } |
|
|
590 | |
|
|
591 | void |
|
|
592 | ptytty::drop_privileges () |
|
|
593 | { |
|
|
594 | uid_t uid = getuid (); |
|
|
595 | gid_t gid = getgid (); |
|
|
596 | |
|
|
597 | // drop privileges |
|
|
598 | #if HAVE_SETRESUID |
|
|
599 | setresgid (gid, gid, gid); |
|
|
600 | setresuid (uid, uid, uid); |
|
|
601 | #elif HAVE_SETREUID |
|
|
602 | setregid (gid, gid); |
|
|
603 | setreuid (uid, uid); |
|
|
604 | #elif HAVE_SETUID |
|
|
605 | setgid (gid); |
|
|
606 | setuid (uid); |
|
|
607 | #endif |
|
|
608 | |
|
|
609 | if (uid != geteuid () |
|
|
610 | || gid != getegid ()) |
|
|
611 | ptytty_fatal ("unable to drop privileges, aborting.\n"); |
|
|
612 | } |
|
|
613 | |