1 /*
2 * Copyright (c) 2006 Chad Mynhier.
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 #include "includes.h"
19
20 #ifdef USE_SOLARIS_PROCESS_CONTRACTS
21
22 #include <sys/types.h>
23 #include <sys/stat.h>
24 #include <sys/param.h>
25
26 #include <errno.h>
27 #ifdef HAVE_FCNTL_H
28 # include <fcntl.h>
29 #endif
30 #include <stdarg.h>
31 #include <string.h>
32 #include <unistd.h>
33
34 #include <libcontract.h>
35 #include <sys/contract/process.h>
36 #include <sys/ctfs.h>
37
38 #include "log.h"
39
40 #define CT_TEMPLATE CTFS_ROOT "/process/template"
41 #define CT_LATEST CTFS_ROOT "/process/latest"
42
43 static int tmpl_fd = -1;
44
45 /* Lookup the latest process contract */
46 static ctid_t
get_active_process_contract_id(void)47 get_active_process_contract_id(void)
48 {
49 int stat_fd;
50 ctid_t ctid = -1;
51 ct_stathdl_t stathdl;
52
53 if ((stat_fd = open64(CT_LATEST, O_RDONLY)) == -1) {
54 error("%s: Error opening 'latest' process "
55 "contract: %s", __func__, strerror(errno));
56 return -1;
57 }
58 if (ct_status_read(stat_fd, CTD_COMMON, &stathdl) != 0) {
59 error("%s: Error reading process contract "
60 "status: %s", __func__, strerror(errno));
61 goto out;
62 }
63 if ((ctid = ct_status_get_id(stathdl)) < 0) {
64 error("%s: Error getting process contract id: %s",
65 __func__, strerror(errno));
66 goto out;
67 }
68
69 ct_status_free(stathdl);
70 out:
71 close(stat_fd);
72 return ctid;
73 }
74
75 void
solaris_contract_pre_fork(void)76 solaris_contract_pre_fork(void)
77 {
78 if ((tmpl_fd = open64(CT_TEMPLATE, O_RDWR)) == -1) {
79 error("%s: open %s: %s", __func__,
80 CT_TEMPLATE, strerror(errno));
81 return;
82 }
83
84 debug2("%s: setting up process contract template on fd %d",
85 __func__, tmpl_fd);
86
87 /* First we set the template parameters and event sets. */
88 if (ct_pr_tmpl_set_param(tmpl_fd, CT_PR_PGRPONLY) != 0) {
89 error("%s: Error setting process contract parameter set "
90 "(pgrponly): %s", __func__, strerror(errno));
91 goto fail;
92 }
93 if (ct_pr_tmpl_set_fatal(tmpl_fd, CT_PR_EV_HWERR) != 0) {
94 error("%s: Error setting process contract template "
95 "fatal events: %s", __func__, strerror(errno));
96 goto fail;
97 }
98 if (ct_tmpl_set_critical(tmpl_fd, 0) != 0) {
99 error("%s: Error setting process contract template "
100 "critical events: %s", __func__, strerror(errno));
101 goto fail;
102 }
103 if (ct_tmpl_set_informative(tmpl_fd, CT_PR_EV_HWERR) != 0) {
104 error("%s: Error setting process contract template "
105 "informative events: %s", __func__, strerror(errno));
106 goto fail;
107 }
108
109 /* Now make this the active template for this process. */
110 if (ct_tmpl_activate(tmpl_fd) != 0) {
111 error("%s: Error activating process contract "
112 "template: %s", __func__, strerror(errno));
113 goto fail;
114 }
115 return;
116
117 fail:
118 if (tmpl_fd != -1) {
119 close(tmpl_fd);
120 tmpl_fd = -1;
121 }
122 }
123
124 void
solaris_contract_post_fork_child()125 solaris_contract_post_fork_child()
126 {
127 debug2("%s: clearing process contract template on fd %d",
128 __func__, tmpl_fd);
129
130 /* Clear the active template. */
131 if (ct_tmpl_clear(tmpl_fd) != 0)
132 error("%s: Error clearing active process contract "
133 "template: %s", __func__, strerror(errno));
134
135 close(tmpl_fd);
136 tmpl_fd = -1;
137 }
138
139 void
solaris_contract_post_fork_parent(pid_t pid)140 solaris_contract_post_fork_parent(pid_t pid)
141 {
142 ctid_t ctid;
143 char ctl_path[256];
144 int r, ctl_fd = -1, stat_fd = -1;
145
146 debug2("%s: clearing template (fd %d)", __func__, tmpl_fd);
147
148 if (tmpl_fd == -1)
149 return;
150
151 /* First clear the active template. */
152 if ((r = ct_tmpl_clear(tmpl_fd)) != 0)
153 error("%s: Error clearing active process contract "
154 "template: %s", __func__, strerror(errno));
155
156 close(tmpl_fd);
157 tmpl_fd = -1;
158
159 /*
160 * If either the fork didn't succeed (pid < 0), or clearing
161 * th active contract failed (r != 0), then we have nothing
162 * more do.
163 */
164 if (r != 0 || pid <= 0)
165 return;
166
167 /* Now lookup and abandon the contract we've created. */
168 ctid = get_active_process_contract_id();
169
170 debug2("%s: abandoning contract id %ld", __func__, ctid);
171
172 snprintf(ctl_path, sizeof(ctl_path),
173 CTFS_ROOT "/process/%ld/ctl", ctid);
174 if ((ctl_fd = open64(ctl_path, O_WRONLY)) < 0) {
175 error("%s: Error opening process contract "
176 "ctl file: %s", __func__, strerror(errno));
177 goto fail;
178 }
179 if (ct_ctl_abandon(ctl_fd) < 0) {
180 error("%s: Error abandoning process contract: %s",
181 __func__, strerror(errno));
182 goto fail;
183 }
184 close(ctl_fd);
185 return;
186
187 fail:
188 if (tmpl_fd != -1) {
189 close(tmpl_fd);
190 tmpl_fd = -1;
191 }
192 if (stat_fd != -1)
193 close(stat_fd);
194 if (ctl_fd != -1)
195 close(ctl_fd);
196 }
197 #endif
198
199 #ifdef USE_SOLARIS_PROJECTS
200 #include <sys/task.h>
201 #include <project.h>
202
203 /*
204 * Get/set solaris default project.
205 * If we fail, just run along gracefully.
206 */
207 void
solaris_set_default_project(struct passwd * pw)208 solaris_set_default_project(struct passwd *pw)
209 {
210 struct project *defaultproject;
211 struct project tempproject;
212 char buf[1024];
213
214 /* get default project, if we fail just return gracefully */
215 if ((defaultproject = getdefaultproj(pw->pw_name, &tempproject, &buf,
216 sizeof(buf))) != NULL) {
217 /* set default project */
218 if (setproject(defaultproject->pj_name, pw->pw_name,
219 TASK_NORMAL) != 0)
220 debug("setproject(%s): %s", defaultproject->pj_name,
221 strerror(errno));
222 } else {
223 /* debug on getdefaultproj() error */
224 debug("getdefaultproj(%s): %s", pw->pw_name, strerror(errno));
225 }
226 }
227 #endif /* USE_SOLARIS_PROJECTS */
228
229 #ifdef USE_SOLARIS_PRIVS
230 # ifdef HAVE_PRIV_H
231 # include <priv.h>
232 # endif
233
234 priv_set_t *
solaris_basic_privset(void)235 solaris_basic_privset(void)
236 {
237 priv_set_t *pset;
238
239 #ifdef HAVE_PRIV_BASICSET
240 if ((pset = priv_allocset()) == NULL) {
241 error("priv_allocset: %s", strerror(errno));
242 return NULL;
243 }
244 priv_basicset(pset);
245 #else
246 if ((pset = priv_str_to_set("basic", ",", NULL)) == NULL) {
247 error("priv_str_to_set: %s", strerror(errno));
248 return NULL;
249 }
250 #endif
251 return pset;
252 }
253
254 void
solaris_drop_privs_pinfo_net_fork_exec(void)255 solaris_drop_privs_pinfo_net_fork_exec(void)
256 {
257 priv_set_t *pset = NULL, *npset = NULL;
258
259 /*
260 * Note: this variant avoids dropping DAC filesystem rights, in case
261 * the process calling it is running as root and should have the
262 * ability to read/write/chown any file on the system.
263 *
264 * We start with the basic set, then *add* the DAC rights to it while
265 * taking away other parts of BASIC we don't need. Then we intersect
266 * this with our existing PERMITTED set. In this way we keep any
267 * DAC rights we had before, while otherwise reducing ourselves to
268 * the minimum set of privileges we need to proceed.
269 *
270 * This also means we drop any other parts of "root" that we don't
271 * need (e.g. the ability to kill any process, create new device nodes
272 * etc etc).
273 */
274
275 if ((pset = priv_allocset()) == NULL)
276 fatal("priv_allocset: %s", strerror(errno));
277 if ((npset = solaris_basic_privset()) == NULL)
278 fatal("solaris_basic_privset: %s", strerror(errno));
279
280 if (priv_addset(npset, PRIV_FILE_CHOWN) != 0 ||
281 priv_addset(npset, PRIV_FILE_DAC_READ) != 0 ||
282 priv_addset(npset, PRIV_FILE_DAC_SEARCH) != 0 ||
283 priv_addset(npset, PRIV_FILE_DAC_WRITE) != 0 ||
284 priv_addset(npset, PRIV_FILE_OWNER) != 0)
285 fatal("priv_addset: %s", strerror(errno));
286
287 if (priv_delset(npset, PRIV_FILE_LINK_ANY) != 0 ||
288 #ifdef PRIV_NET_ACCESS
289 priv_delset(npset, PRIV_NET_ACCESS) != 0 ||
290 #endif
291 priv_delset(npset, PRIV_PROC_EXEC) != 0 ||
292 priv_delset(npset, PRIV_PROC_FORK) != 0 ||
293 priv_delset(npset, PRIV_PROC_INFO) != 0 ||
294 priv_delset(npset, PRIV_PROC_SESSION) != 0)
295 fatal("priv_delset: %s", strerror(errno));
296
297 if (getppriv(PRIV_PERMITTED, pset) != 0)
298 fatal("getppriv: %s", strerror(errno));
299
300 priv_intersect(pset, npset);
301
302 if (setppriv(PRIV_SET, PRIV_PERMITTED, npset) != 0 ||
303 setppriv(PRIV_SET, PRIV_LIMIT, npset) != 0 ||
304 setppriv(PRIV_SET, PRIV_INHERITABLE, npset) != 0)
305 fatal("setppriv: %s", strerror(errno));
306
307 priv_freeset(pset);
308 priv_freeset(npset);
309 }
310
311 void
solaris_drop_privs_root_pinfo_net(void)312 solaris_drop_privs_root_pinfo_net(void)
313 {
314 priv_set_t *pset = NULL;
315
316 /* Start with "basic" and drop everything we don't need. */
317 if ((pset = solaris_basic_privset()) == NULL)
318 fatal("solaris_basic_privset: %s", strerror(errno));
319
320 if (priv_delset(pset, PRIV_FILE_LINK_ANY) != 0 ||
321 #ifdef PRIV_NET_ACCESS
322 priv_delset(pset, PRIV_NET_ACCESS) != 0 ||
323 #endif
324 priv_delset(pset, PRIV_PROC_INFO) != 0 ||
325 priv_delset(pset, PRIV_PROC_SESSION) != 0)
326 fatal("priv_delset: %s", strerror(errno));
327
328 if (setppriv(PRIV_SET, PRIV_PERMITTED, pset) != 0 ||
329 setppriv(PRIV_SET, PRIV_LIMIT, pset) != 0 ||
330 setppriv(PRIV_SET, PRIV_INHERITABLE, pset) != 0)
331 fatal("setppriv: %s", strerror(errno));
332
333 priv_freeset(pset);
334 }
335
336 void
solaris_drop_privs_root_pinfo_net_exec(void)337 solaris_drop_privs_root_pinfo_net_exec(void)
338 {
339 priv_set_t *pset = NULL;
340
341
342 /* Start with "basic" and drop everything we don't need. */
343 if ((pset = solaris_basic_privset()) == NULL)
344 fatal("solaris_basic_privset: %s", strerror(errno));
345
346 if (priv_delset(pset, PRIV_FILE_LINK_ANY) != 0 ||
347 #ifdef PRIV_NET_ACCESS
348 priv_delset(pset, PRIV_NET_ACCESS) != 0 ||
349 #endif
350 priv_delset(pset, PRIV_PROC_EXEC) != 0 ||
351 priv_delset(pset, PRIV_PROC_INFO) != 0 ||
352 priv_delset(pset, PRIV_PROC_SESSION) != 0)
353 fatal("priv_delset: %s", strerror(errno));
354
355 if (setppriv(PRIV_SET, PRIV_PERMITTED, pset) != 0 ||
356 setppriv(PRIV_SET, PRIV_LIMIT, pset) != 0 ||
357 setppriv(PRIV_SET, PRIV_INHERITABLE, pset) != 0)
358 fatal("setppriv: %s", strerror(errno));
359
360 priv_freeset(pset);
361 }
362
363 #endif
364