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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> |
… | |
… | |
19 | * You should have received a copy of the GNU General Public License |
22 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
23 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
22 | *---------------------------------------------------------------------*/ |
25 | *---------------------------------------------------------------------*/ |
23 | |
26 | |
24 | #include "../config.h" /* NECESSARY */ |
27 | #include "../config.h" |
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28 | |
25 | #include "rxvt.h" |
29 | #include "ptytty.h" |
26 | |
30 | |
27 | #include <cstdlib> |
31 | #include <cstdlib> |
28 | #include <cstring> |
32 | #include <cstring> |
29 | |
33 | |
30 | #include <sys/types.h> |
34 | #include <sys/types.h> |
… | |
… | |
33 | #include <fcntl.h> |
37 | #include <fcntl.h> |
34 | |
38 | |
35 | #ifdef HAVE_SYS_IOCTL_H |
39 | #ifdef HAVE_SYS_IOCTL_H |
36 | # include <sys/ioctl.h> |
40 | # include <sys/ioctl.h> |
37 | #endif |
41 | #endif |
38 | #if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
42 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
39 | # include <sys/stropts.h> /* for I_PUSH */ |
43 | # include <sys/stropts.h> /* for I_PUSH */ |
40 | #endif |
44 | #endif |
41 | #ifdef HAVE_ISASTREAM |
45 | #ifdef HAVE_ISASTREAM |
42 | # include <stropts.h> |
46 | # include <stropts.h> |
43 | #endif |
47 | #endif |
… | |
… | |
46 | #elif defined(HAVE_LIBUTIL_H) |
50 | #elif defined(HAVE_LIBUTIL_H) |
47 | # include <libutil.h> |
51 | # include <libutil.h> |
48 | #elif defined(HAVE_UTIL_H) |
52 | #elif defined(HAVE_UTIL_H) |
49 | # include <util.h> |
53 | # include <util.h> |
50 | #endif |
54 | #endif |
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55 | #ifdef TTY_GID_SUPPORT |
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56 | #include <grp.h> |
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57 | #endif |
51 | |
58 | |
52 | #include <cstdio> |
59 | #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 | |
60 | |
59 | ///////////////////////////////////////////////////////////////////////////// |
61 | ///////////////////////////////////////////////////////////////////////////// |
60 | |
62 | |
61 | /* ------------------------------------------------------------------------- * |
63 | /* ------------------------------------------------------------------------- * |
62 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
64 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
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… | |
64 | /* |
66 | /* |
65 | * Returns pty file descriptor, or -1 on failure |
67 | * Returns pty file descriptor, or -1 on failure |
66 | * If successful, ttydev is set to the name of the slave device. |
68 | * 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 |
69 | * fd_tty _may_ also be set to an open fd to the slave device |
68 | */ |
70 | */ |
69 | static inline int |
71 | #if defined(UNIX98_PTY) |
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72 | static int |
70 | get_pty_streams (int *fd_tty, char **ttydev) |
73 | get_pty (int *fd_tty, char **ttydev) |
71 | { |
74 | { |
72 | #ifdef NO_SETOWNER_TTYDEV |
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73 | int pfd; |
75 | int pfd; |
74 | |
76 | |
75 | # if defined(PTYS_ARE_GETPT) |
77 | # if defined(HAVE_GETPT) |
76 | pfd = getpt(); |
78 | pfd = getpt(); |
77 | # elif defined(PTYS_ARE_POSIX) |
79 | # elif defined(HAVE_POSIX_OPENPT) |
78 | pfd = posix_openpt (O_RDWR); |
80 | pfd = posix_openpt (O_RDWR); |
79 | # else |
81 | # else |
80 | pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
82 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
81 | # endif |
83 | # endif |
82 | if (pfd >= 0) |
84 | if (pfd >= 0) |
83 | { |
85 | { |
84 | if (grantpt (pfd) == 0 /* change slave permissions */ |
86 | if (grantpt (pfd) == 0 /* change slave permissions */ |
85 | && unlockpt (pfd) == 0) |
87 | && unlockpt (pfd) == 0) |
… | |
… | |
88 | return pfd; |
90 | return pfd; |
89 | } |
91 | } |
90 | |
92 | |
91 | close (pfd); |
93 | close (pfd); |
92 | } |
94 | } |
93 | #endif |
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94 | |
95 | |
95 | return -1; |
96 | return -1; |
96 | } |
97 | } |
97 | |
98 | #elif defined(HAVE_OPENPTY) |
98 | static inline int |
99 | static int |
99 | get_pty_openpty (int *fd_tty, char **ttydev) |
100 | get_pty (int *fd_tty, char **ttydev) |
100 | { |
101 | { |
101 | #ifdef PTYS_ARE_OPENPTY |
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102 | int pfd; |
102 | int pfd; |
103 | int res; |
103 | int res; |
104 | char tty_name[sizeof "/dev/pts/????\0"]; |
104 | char tty_name[32]; |
105 | |
105 | |
106 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
106 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
107 | if (res != -1) |
107 | if (res != -1) |
108 | { |
108 | { |
109 | *ttydev = strdup (tty_name); |
109 | *ttydev = strdup (tty_name); |
110 | return pfd; |
110 | return pfd; |
111 | } |
111 | } |
112 | #endif |
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113 | |
112 | |
114 | return -1; |
113 | return -1; |
115 | } |
114 | } |
116 | |
115 | #elif defined(HAVE__GETPTY) |
117 | static inline int |
116 | static int |
118 | get_pty__getpty (int *fd_tty, char **ttydev) |
117 | get_pty (int *fd_tty, char **ttydev) |
119 | { |
118 | { |
120 | #ifdef PTYS_ARE__GETPTY |
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121 | int pfd; |
119 | int pfd; |
122 | |
120 | |
123 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
121 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
124 | if (*ttydev != NULL) |
122 | if (*ttydev != NULL) |
125 | return pfd; |
123 | return pfd; |
126 | #endif |
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127 | |
124 | |
128 | return -1; |
125 | return -1; |
129 | } |
126 | } |
130 | |
127 | #elif defined(HAVE_DEV_PTC) |
131 | static inline int |
128 | static int |
132 | get_pty_ptc (int *fd_tty, char **ttydev) |
129 | get_pty (int *fd_tty, char **ttydev) |
133 | { |
130 | { |
134 | #ifdef PTYS_ARE_PTC |
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135 | int pfd; |
131 | int pfd; |
136 | |
132 | |
137 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
133 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
138 | { |
134 | { |
139 | *ttydev = strdup (ttyname (pfd)); |
135 | *ttydev = strdup (ttyname (pfd)); |
140 | return pfd; |
136 | return pfd; |
141 | } |
137 | } |
142 | #endif |
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143 | |
138 | |
144 | return -1; |
139 | return -1; |
145 | } |
140 | } |
146 | |
141 | #elif defined(HAVE_DEV_CLONE) |
147 | static inline int |
142 | static int |
148 | get_pty_clone (int *fd_tty, char **ttydev) |
143 | get_pty (int *fd_tty, char **ttydev) |
149 | { |
144 | { |
150 | #ifdef PTYS_ARE_CLONE |
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151 | int pfd; |
145 | int pfd; |
152 | |
146 | |
153 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
147 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
154 | { |
148 | { |
155 | *ttydev = strdup (ptsname (pfd)); |
149 | *ttydev = strdup (ptsname (pfd)); |
156 | return pfd; |
150 | return pfd; |
157 | } |
151 | } |
158 | #endif |
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159 | |
152 | |
160 | return -1; |
153 | return -1; |
161 | } |
154 | } |
162 | |
155 | #else |
163 | static inline int |
156 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
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157 | static int |
164 | get_pty_numeric (int *fd_tty, char **ttydev) |
158 | get_pty (int *fd_tty, char **ttydev) |
165 | { |
159 | { |
166 | #ifdef PTYS_ARE_NUMERIC |
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167 | int pfd; |
160 | int pfd; |
168 | int idx; |
161 | int i; |
169 | char *c1, *c2; |
162 | char pty_name[32]; |
170 | char pty_name[] = "/dev/ptyp???"; |
163 | char tty_name[32]; |
171 | char tty_name[] = "/dev/ttyp???"; |
164 | const char *majors = "pqrstuvwxyzabcde"; |
172 | |
165 | const char *minors = "0123456789abcdef"; |
173 | c1 = &(pty_name[sizeof (pty_name) - 4]); |
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174 | c2 = &(tty_name[sizeof (tty_name) - 4]); |
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175 | |
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176 | for (idx = 0; idx < 256; idx++) |
166 | for (i = 0; i < 256; i++) |
177 | { |
167 | { |
178 | sprintf (c1, "%d", idx); |
168 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
179 | sprintf (c2, "%d", idx); |
169 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
180 | |
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181 | if (access (tty_name, F_OK) < 0) |
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182 | { |
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183 | idx = 256; |
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184 | break; |
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185 | } |
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186 | |
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187 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
170 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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171 | { |
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172 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
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173 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
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174 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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175 | continue; |
188 | { |
176 | } |
189 | if (access (tty_name, R_OK | W_OK) == 0) |
177 | if (access (tty_name, R_OK | W_OK) == 0) |
190 | { |
178 | { |
191 | *ttydev = strdup (tty_name); |
179 | *ttydev = strdup (tty_name); |
192 | return pfd; |
180 | return pfd; |
193 | } |
181 | } |
194 | |
182 | |
195 | close (pfd); |
183 | close (pfd); |
196 | } |
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197 | } |
184 | } |
198 | #endif |
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199 | |
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200 | return -1; |
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201 | } |
185 | } |
202 | |
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203 | static inline int |
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204 | get_pty_searched (int *fd_tty, char **ttydev) |
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205 | { |
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206 | #ifdef PTYS_ARE_SEARCHED |
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207 | # ifndef PTYCHAR1 |
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208 | # define PTYCHAR1 "pqrstuvwxyz" |
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209 | # endif |
186 | #endif |
210 | # ifndef PTYCHAR2 |
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211 | # define PTYCHAR2 "0123456789abcdef" |
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212 | # endif |
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213 | int pfd; |
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214 | const char *c1, *c2; |
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215 | char pty_name[] = "/dev/pty??"; |
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216 | char tty_name[] = "/dev/tty??"; |
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217 | |
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218 | for (c1 = PTYCHAR1; *c1; c1++) |
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219 | { |
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220 | pty_name[ (sizeof (pty_name) - 3)] = |
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221 | tty_name[ (sizeof (pty_name) - 3)] = *c1; |
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222 | |
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223 | for (c2 = PTYCHAR2; *c2; c2++) |
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224 | { |
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225 | pty_name[ (sizeof (pty_name) - 2)] = |
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226 | tty_name[ (sizeof (pty_name) - 2)] = *c2; |
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227 | |
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228 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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229 | { |
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230 | if (access (tty_name, R_OK | W_OK) == 0) |
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231 | { |
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232 | *ttydev = strdup (tty_name); |
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233 | return pfd; |
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234 | } |
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235 | |
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236 | close (pfd); |
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237 | } |
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238 | } |
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239 | } |
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240 | #endif |
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241 | |
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242 | return -1; |
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243 | } |
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244 | |
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245 | static int |
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246 | get_pty (int *fd_tty, char **ttydev) |
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247 | { |
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248 | int pfd; |
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249 | |
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250 | if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1 |
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251 | || (pfd = get_pty_openpty (fd_tty, ttydev)) != -1 |
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252 | || (pfd = get_pty__getpty (fd_tty, ttydev)) != -1 |
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253 | || (pfd = get_pty_ptc (fd_tty, ttydev)) != -1 |
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254 | || (pfd = get_pty_clone (fd_tty, ttydev)) != -1 |
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255 | || (pfd = get_pty_numeric (fd_tty, ttydev)) != -1 |
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256 | || (pfd = get_pty_searched (fd_tty, ttydev)) != -1) |
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257 | return pfd; |
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258 | |
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259 | return -1; |
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260 | } |
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261 | |
187 | |
262 | /*----------------------------------------------------------------------*/ |
188 | /*----------------------------------------------------------------------*/ |
263 | /* |
189 | /* |
264 | * Returns tty file descriptor, or -1 on failure |
190 | * Returns tty file descriptor, or -1 on failure |
265 | */ |
191 | */ |
… | |
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276 | static int |
202 | static int |
277 | control_tty (int fd_tty) |
203 | control_tty (int fd_tty) |
278 | { |
204 | { |
279 | setsid (); |
205 | setsid (); |
280 | |
206 | |
281 | #if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
207 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
282 | /* |
208 | /* |
283 | * Push STREAMS modules: |
209 | * Push STREAMS modules: |
284 | * ptem: pseudo-terminal hardware emulation module. |
210 | * ptem: pseudo-terminal hardware emulation module. |
285 | * ldterm: standard terminal line discipline. |
211 | * ldterm: standard terminal line discipline. |
286 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
212 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
… | |
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308 | |
234 | |
309 | ioctl (fd_tty, TIOCSCTTY, NULL); |
235 | ioctl (fd_tty, TIOCSCTTY, NULL); |
310 | |
236 | |
311 | int fd = open ("/dev/tty", O_WRONLY); |
237 | int fd = open ("/dev/tty", O_WRONLY); |
312 | if (fd < 0) |
238 | if (fd < 0) |
313 | return -1; /* fatal */ |
239 | return -1; /* fatal */ |
314 | |
240 | |
315 | close (fd); |
241 | close (fd); |
316 | |
242 | |
317 | return 0; |
243 | return 0; |
318 | } |
244 | } |
319 | |
245 | |
320 | void |
246 | void |
321 | rxvt_ptytty::close_tty () |
247 | ptytty::close_tty () |
322 | { |
248 | { |
323 | if (tty < 0) |
249 | if (tty < 0) |
324 | return; |
250 | return; |
325 | |
251 | |
326 | close (tty); |
252 | close (tty); |
327 | tty = -1; |
253 | tty = -1; |
328 | } |
254 | } |
329 | |
255 | |
330 | bool |
256 | bool |
331 | rxvt_ptytty::make_controlling_tty () |
257 | ptytty::make_controlling_tty () |
332 | { |
258 | { |
333 | return control_tty (tty) >= 0; |
259 | return control_tty (tty) >= 0; |
334 | } |
260 | } |
335 | |
261 | |
336 | void |
262 | void |
337 | rxvt_ptytty::set_utf8_mode (bool on) |
263 | ptytty::set_utf8_mode (bool on) |
338 | { |
264 | { |
339 | #ifdef IUTF8 |
265 | #ifdef IUTF8 |
340 | if (pty < 0) |
266 | if (pty < 0) |
341 | return; |
267 | return; |
342 | |
268 | |
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358 | } |
284 | } |
359 | } |
285 | } |
360 | #endif |
286 | #endif |
361 | } |
287 | } |
362 | |
288 | |
363 | ///////////////////////////////////////////////////////////////////////////// |
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364 | |
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365 | #ifndef NO_SETOWNER_TTYDEV |
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366 | static struct ttyconf { |
289 | static struct ttyconf { |
367 | gid_t gid; |
290 | gid_t gid; |
368 | mode_t mode; |
291 | mode_t mode; |
369 | |
292 | |
370 | ttyconf () |
293 | ttyconf () |
… | |
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379 | } |
302 | } |
380 | else |
303 | else |
381 | #endif /* TTY_GID_SUPPORT */ |
304 | #endif /* TTY_GID_SUPPORT */ |
382 | { |
305 | { |
383 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
306 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
384 | gid = getgid (); |
307 | gid = 0; |
385 | } |
308 | } |
386 | } |
309 | } |
387 | } ttyconf; |
310 | } ttyconf; |
388 | |
311 | |
389 | ///////////////////////////////////////////////////////////////////////////// |
312 | ptytty_unix::ptytty_unix () |
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313 | { |
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314 | name = 0; |
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315 | #if UTMP_SUPPORT |
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316 | cmd_pid = 0; |
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317 | #endif |
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318 | } |
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319 | |
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320 | ptytty_unix::~ptytty_unix () |
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321 | { |
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322 | #if UTMP_SUPPORT |
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323 | logout (); |
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324 | #endif |
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325 | put (); |
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326 | } |
390 | |
327 | |
391 | void |
328 | void |
392 | rxvt_ptytty_unix::privileges (rxvt_privaction action) |
329 | ptytty_unix::put () |
393 | { |
330 | { |
394 | if (!name || !*name) |
331 | chmod (name, RESTORE_TTY_MODE); |
395 | return; |
332 | chown (name, 0, ttyconf.gid); |
396 | |
333 | |
397 | if (action == SAVE) |
334 | close_tty (); |
398 | { |
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399 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
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400 | /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
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401 | if (lstat (name, &savestat) < 0) /* you lose out */ |
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402 | ; |
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403 | else |
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404 | # endif |
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405 | { |
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406 | saved = true; |
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407 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
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408 | chmod (name, ttyconf.mode); |
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409 | # ifdef HAVE_REVOKE |
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410 | revoke (name); |
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411 | # endif |
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412 | } |
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413 | } |
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414 | else |
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415 | { /* action == RESTORE */ |
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416 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
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417 | if (saved) |
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418 | { |
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419 | chmod (name, savestat.st_mode); |
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420 | chown (name, savestat.st_uid, savestat.st_gid); |
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421 | } |
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422 | # else |
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423 | chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
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424 | chown (name, 0, 0); |
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425 | # endif |
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426 | } |
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427 | } |
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428 | #endif |
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429 | |
335 | |
430 | rxvt_ptytty_unix::rxvt_ptytty_unix () |
336 | if (pty >= 0) |
431 | { |
337 | close (pty); |
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338 | |
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339 | free (name); |
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340 | |
432 | pty = tty = -1; |
341 | pty = tty = -1; |
433 | name = 0; |
342 | name = 0; |
434 | #ifndef NO_SETOWNER_TTYDEV |
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435 | saved = false; |
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436 | #endif |
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437 | #if UTMP_SUPPORT |
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438 | cmd_pid = 0; |
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439 | #endif |
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440 | } |
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441 | |
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442 | rxvt_ptytty_unix::~rxvt_ptytty_unix () |
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443 | { |
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444 | #if UTMP_SUPPORT |
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445 | logout (); |
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446 | #endif |
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447 | put (); |
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448 | } |
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449 | |
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450 | void |
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451 | rxvt_ptytty_unix::put () |
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452 | { |
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453 | #ifndef NO_SETOWNER_TTYDEV |
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454 | privileges (RESTORE); |
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455 | #endif |
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456 | |
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457 | if (pty >= 0) close (pty); |
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458 | close_tty (); |
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459 | free (name); |
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460 | |
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461 | pty = tty = -1; |
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462 | name = 0; |
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463 | } |
343 | } |
464 | |
344 | |
465 | bool |
345 | bool |
466 | rxvt_ptytty_unix::get () |
346 | ptytty_unix::get () |
467 | { |
347 | { |
468 | /* get master (pty) */ |
348 | /* get master (pty) */ |
469 | if ((pty = get_pty (&tty, &name)) < 0) |
349 | if ((pty = get_pty (&tty, &name)) < 0) |
470 | return false; |
350 | return false; |
471 | |
351 | |
… | |
… | |
473 | |
353 | |
474 | /* get slave (tty) */ |
354 | /* get slave (tty) */ |
475 | if (tty < 0) |
355 | if (tty < 0) |
476 | { |
356 | { |
477 | #ifndef NO_SETOWNER_TTYDEV |
357 | #ifndef NO_SETOWNER_TTYDEV |
478 | privileges (SAVE); |
358 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
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359 | chmod (name, ttyconf.mode); |
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360 | # ifdef HAVE_REVOKE |
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361 | revoke (name); |
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362 | # endif |
479 | #endif |
363 | #endif |
480 | |
364 | |
481 | if ((tty = get_tty (name)) < 0) |
365 | if ((tty = get_tty (name)) < 0) |
482 | { |
366 | { |
483 | put (); |
367 | put (); |
… | |
… | |
488 | return true; |
372 | return true; |
489 | } |
373 | } |
490 | |
374 | |
491 | #if PTYTTY_HELPER |
375 | #if PTYTTY_HELPER |
492 | |
376 | |
493 | static int sock_fd; |
377 | static int sock_fd = -1; |
494 | static int pid; |
378 | static int helper_pid, owner_pid; |
495 | |
379 | |
496 | struct command |
380 | struct command |
497 | { |
381 | { |
498 | enum { get, login, destroy } type; |
382 | enum { get, login, destroy } type; |
499 | |
383 | |
500 | rxvt_ptytty *id; |
384 | ptytty *id; |
501 | |
385 | |
502 | bool login_shell; |
386 | bool login_shell; |
503 | int cmd_pid; |
387 | int cmd_pid; |
504 | char hostname[512]; // arbitrary, but should be plenty |
388 | char hostname[512]; // arbitrary, but should be plenty |
505 | }; |
389 | }; |
506 | |
390 | |
507 | struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty |
391 | struct ptytty_proxy : ptytty |
508 | { |
392 | { |
509 | rxvt_ptytty *id; |
393 | ptytty *id; |
510 | |
394 | |
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395 | ptytty_proxy () |
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396 | : id(0) |
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397 | { |
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398 | } |
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399 | |
511 | ~rxvt_ptytty_proxy (); |
400 | ~ptytty_proxy (); |
512 | |
401 | |
513 | bool get (); |
402 | bool get (); |
514 | void login (int cmd_pid, bool login_shell, const char *hostname); |
403 | void login (int cmd_pid, bool login_shell, const char *hostname); |
515 | }; |
404 | }; |
516 | |
405 | |
517 | bool |
406 | bool |
518 | rxvt_ptytty_proxy::get () |
407 | ptytty_proxy::get () |
519 | { |
408 | { |
520 | command cmd; |
409 | command cmd; |
521 | |
410 | |
522 | cmd.type = command::get; |
411 | cmd.type = command::get; |
523 | |
412 | |
524 | write (sock_fd, &cmd, sizeof (cmd)); |
413 | write (sock_fd, &cmd, sizeof (cmd)); |
525 | |
414 | |
526 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
415 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
527 | rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
416 | ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
528 | |
417 | |
529 | if (!id) |
418 | if (!id) |
530 | return false; |
419 | return false; |
531 | |
420 | |
532 | if ((pty = rxvt_recv_fd (sock_fd)) < 0 |
421 | if ((pty = recv_fd (sock_fd)) < 0 |
533 | || (tty = rxvt_recv_fd (sock_fd)) < 0) |
422 | || (tty = recv_fd (sock_fd)) < 0) |
534 | rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
423 | ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
535 | |
424 | |
536 | return true; |
425 | return true; |
537 | } |
426 | } |
538 | |
427 | |
539 | void |
428 | void |
540 | rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
429 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
541 | { |
430 | { |
542 | command cmd; |
431 | command cmd; |
543 | |
432 | |
544 | cmd.type = command::login; |
433 | cmd.type = command::login; |
545 | cmd.id = id; |
434 | cmd.id = id; |
… | |
… | |
548 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
437 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
549 | |
438 | |
550 | write (sock_fd, &cmd, sizeof (cmd)); |
439 | write (sock_fd, &cmd, sizeof (cmd)); |
551 | } |
440 | } |
552 | |
441 | |
553 | rxvt_ptytty_proxy::~rxvt_ptytty_proxy () |
442 | ptytty_proxy::~ptytty_proxy () |
554 | { |
443 | { |
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444 | if (id) |
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445 | { |
555 | command cmd; |
446 | command cmd; |
556 | |
447 | |
557 | cmd.type = command::destroy; |
448 | cmd.type = command::destroy; |
558 | cmd.id = id; |
449 | cmd.id = id; |
559 | |
450 | |
560 | write (sock_fd, &cmd, sizeof (cmd)); |
451 | write (sock_fd, &cmd, sizeof (cmd)); |
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452 | } |
561 | } |
453 | } |
562 | |
454 | |
563 | static |
455 | static |
564 | void serve () |
456 | void serve () |
565 | { |
457 | { |
566 | command cmd; |
458 | command cmd; |
567 | vector<rxvt_ptytty *> ptys; |
459 | vector<ptytty *> ptys; |
568 | |
460 | |
569 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
461 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
570 | { |
462 | { |
571 | if (cmd.type == command::get) |
463 | if (cmd.type == command::get) |
572 | { |
464 | { |
573 | // -> id ptyfd ttyfd |
465 | // -> id ptyfd ttyfd |
574 | cmd.id = new rxvt_ptytty_unix; |
466 | cmd.id = new ptytty_unix; |
575 | |
467 | |
576 | if (cmd.id->get ()) |
468 | if (cmd.id->get ()) |
577 | { |
469 | { |
578 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
470 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
579 | ptys.push_back (cmd.id); |
471 | ptys.push_back (cmd.id); |
580 | |
472 | |
581 | rxvt_send_fd (sock_fd, cmd.id->pty); |
473 | ptytty::send_fd (sock_fd, cmd.id->pty); |
582 | rxvt_send_fd (sock_fd, cmd.id->tty); |
474 | ptytty::send_fd (sock_fd, cmd.id->tty); |
583 | } |
475 | } |
584 | else |
476 | else |
585 | { |
477 | { |
586 | delete cmd.id; |
478 | delete cmd.id; |
587 | cmd.id = 0; |
479 | cmd.id = 0; |
… | |
… | |
598 | } |
490 | } |
599 | #endif |
491 | #endif |
600 | } |
492 | } |
601 | else if (cmd.type == command::destroy) |
493 | else if (cmd.type == command::destroy) |
602 | { |
494 | { |
603 | rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id); |
495 | vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id); |
604 | |
496 | |
605 | if (pty) |
497 | if (pty != ptys.end ()) |
606 | { |
498 | { |
607 | delete *pty; |
499 | delete *pty; |
608 | ptys.erase (pty); |
500 | ptys.erase (pty); |
609 | } |
501 | } |
610 | } |
502 | } |
611 | else |
503 | else |
612 | break; |
504 | break; |
613 | } |
505 | } |
614 | |
506 | |
615 | // destroy all ptys |
507 | // destroy all ptys |
616 | for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); ) |
508 | for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); ) |
617 | delete *i; |
509 | delete *i; |
618 | } |
510 | } |
619 | |
511 | |
620 | void rxvt_ptytty_server () |
512 | void |
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513 | ptytty::use_helper () |
621 | { |
514 | { |
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515 | int pid = getpid (); |
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516 | |
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517 | if (sock_fd >= 0 && pid == owner_pid) |
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518 | return; |
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519 | |
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520 | owner_pid = pid; |
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521 | |
622 | int sv[2]; |
522 | int sv[2]; |
623 | |
523 | |
624 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
524 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
625 | rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
525 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
626 | |
526 | |
627 | pid = fork (); |
527 | helper_pid = fork (); |
628 | |
528 | |
629 | if (pid < 0) |
529 | if (helper_pid < 0) |
630 | rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
530 | ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
631 | |
531 | |
632 | if (pid) |
532 | if (helper_pid) |
633 | { |
533 | { |
634 | // client, urxvt |
534 | // client, process |
635 | sock_fd = sv[0]; |
535 | sock_fd = sv[0]; |
636 | close (sv[1]); |
536 | close (sv[1]); |
637 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
537 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
638 | } |
538 | } |
639 | else |
539 | else |
640 | { |
540 | { |
641 | // server, pty-helper |
541 | // server, pty-helper |
642 | sock_fd = sv[1]; |
542 | sock_fd = sv[1]; |
643 | |
543 | |
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544 | chdir ("/"); |
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545 | |
644 | for (int fd = 0; fd < 1023; fd++) |
546 | for (int fd = 0; fd < 1023; fd++) |
645 | if (fd != sock_fd) |
547 | if (fd != sock_fd) |
646 | close (fd); |
548 | close (fd); |
647 | |
549 | |
648 | serve (); |
550 | serve (); |
649 | _exit (EXIT_SUCCESS); |
551 | _exit (EXIT_SUCCESS); |
650 | } |
552 | } |
651 | } |
553 | } |
652 | #endif |
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653 | |
554 | |
654 | // a "factory" *g* |
555 | #endif |
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556 | |
655 | rxvt_ptytty * |
557 | ptytty * |
656 | rxvt_new_ptytty () |
558 | ptytty::create () |
657 | { |
559 | { |
658 | #if PTYTTY_HELPER |
560 | #if PTYTTY_HELPER |
659 | if (pid > 0) |
561 | if (helper_pid && getpid () == owner_pid) |
660 | // use helper process |
562 | // use helper process |
661 | return new rxvt_ptytty_proxy; |
563 | return new ptytty_proxy; |
662 | else |
564 | else |
663 | #endif |
565 | #endif |
664 | return new rxvt_ptytty_unix; |
566 | return new ptytty_unix; |
665 | } |
567 | } |
666 | |
568 | |
667 | /*----------------------- end-of-file (C source) -----------------------*/ |
569 | void |
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570 | ptytty::init () |
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571 | { |
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572 | uid_t uid = getuid (); |
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573 | gid_t gid = getgid (); |
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574 | |
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575 | // before doing anything else, check for setuid/setgid operation, |
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576 | // start the helper process and drop privileges |
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577 | if (uid != geteuid () |
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578 | || gid != getegid ()) |
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579 | { |
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580 | #if PTYTTY_HELPER |
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581 | use_helper (); |
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582 | #else |
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583 | ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n"); |
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584 | #endif |
668 | |
585 | |
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586 | drop_privileges (); |
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587 | } |
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588 | } |
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589 | |
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590 | void |
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591 | ptytty::drop_privileges () |
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592 | { |
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593 | uid_t uid = getuid (); |
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594 | gid_t gid = getgid (); |
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595 | |
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596 | // drop privileges |
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597 | #if HAVE_SETRESUID |
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598 | setresgid (gid, gid, gid); |
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599 | setresuid (uid, uid, uid); |
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600 | #elif HAVE_SETREUID |
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601 | setregid (gid, gid); |
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602 | setreuid (uid, uid); |
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603 | #elif HAVE_SETUID |
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604 | setgid (gid); |
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605 | setuid (uid); |
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606 | #endif |
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607 | |
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608 | if (uid != geteuid () |
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609 | || gid != getegid ()) |
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610 | ptytty_fatal ("unable to drop privileges, aborting.\n"); |
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611 | } |
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612 | |