summaryrefslogtreecommitdiff
path: root/openbsd-compat/port-solaris.c
blob: 7d5a28cd0b12019f46bfcec12e0e4fc74e1e7591 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/*
 * Copyright (c) 2006 Chad Mynhier.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "config.h"
#include "includes.h"

#ifdef USE_SOLARIS_PROCESS_CONTRACTS

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>

#include <errno.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#include <stdarg.h>
#include <string.h>
#include <unistd.h>

#include <libcontract.h>
#include <sys/contract/process.h>
#include <sys/ctfs.h>

#include "log.h"

#define CT_TEMPLATE	CTFS_ROOT "/process/template"
#define CT_LATEST	CTFS_ROOT "/process/latest"

static int tmpl_fd = -1;

/* Lookup the latest process contract */
static ctid_t
get_active_process_contract_id(void)
{
	int stat_fd;
	ctid_t ctid = -1;
	ct_stathdl_t stathdl;

	if ((stat_fd = open64(CT_LATEST, O_RDONLY)) == -1) {
		error("%s: Error opening 'latest' process "
		    "contract: %s", __func__, strerror(errno));
		return -1;
	}
	if (ct_status_read(stat_fd, CTD_COMMON, &stathdl) != 0) {
		error("%s: Error reading process contract "
		    "status: %s", __func__, strerror(errno));
		goto out;
	}
	if ((ctid = ct_status_get_id(stathdl)) < 0) {
		error("%s: Error getting process contract id: %s",
		    __func__, strerror(errno));
		goto out;
	}

	ct_status_free(stathdl);
 out:
	close(stat_fd);
	return ctid;
}

void
solaris_contract_pre_fork(void)
{
	if ((tmpl_fd = open64(CT_TEMPLATE, O_RDWR)) == -1) {
		error("%s: open %s: %s", __func__,
		    CT_TEMPLATE, strerror(errno));
		return;
	}

	debug2("%s: setting up process contract template on fd %d",
	    __func__, tmpl_fd);

	/* First we set the template parameters and event sets. */
	if (ct_pr_tmpl_set_param(tmpl_fd, CT_PR_PGRPONLY) != 0) {
		error("%s: Error setting process contract parameter set "
		    "(pgrponly): %s", __func__, strerror(errno));
		goto fail;
	}
	if (ct_pr_tmpl_set_fatal(tmpl_fd, CT_PR_EV_HWERR) != 0) {
		error("%s: Error setting process contract template "
		    "fatal events: %s", __func__, strerror(errno));
		goto fail;
	}
	if (ct_tmpl_set_critical(tmpl_fd, 0) != 0) {
		error("%s: Error setting process contract template "
		    "critical events: %s", __func__, strerror(errno));
		goto fail;
	}
	if (ct_tmpl_set_informative(tmpl_fd, CT_PR_EV_HWERR) != 0) {
		error("%s: Error setting process contract template "
		    "informative events: %s", __func__, strerror(errno));
		goto fail;
	}

	/* Now make this the active template for this process. */
	if (ct_tmpl_activate(tmpl_fd) != 0) {
		error("%s: Error activating process contract "
		    "template: %s", __func__, strerror(errno));
		goto fail;
	}
	return;

 fail:
	if (tmpl_fd != -1) {
		close(tmpl_fd);
		tmpl_fd = -1;
	}
}

void
solaris_contract_post_fork_child()
{
	debug2("%s: clearing process contract template on fd %d",
	    __func__, tmpl_fd);

	/* Clear the active template. */
	if (ct_tmpl_clear(tmpl_fd) != 0)
		error("%s: Error clearing active process contract "
		    "template: %s", __func__, strerror(errno));

	close(tmpl_fd);
	tmpl_fd = -1;
}

void
solaris_contract_post_fork_parent(pid_t pid)
{
	ctid_t ctid;
	char ctl_path[256];
	int r, ctl_fd = -1, stat_fd = -1;

	debug2("%s: clearing template (fd %d)", __func__, tmpl_fd);

	if (tmpl_fd == -1)
		return;

	/* First clear the active template. */
	if ((r = ct_tmpl_clear(tmpl_fd)) != 0)
		error("%s: Error clearing active process contract "
		    "template: %s", __func__, strerror(errno));

	close(tmpl_fd);
	tmpl_fd = -1;

	/*
	 * If either the fork didn't succeed (pid < 0), or clearing
	 * th active contract failed (r != 0), then we have nothing
	 * more do.
	 */
	if (r != 0 || pid <= 0)
		return;

	/* Now lookup and abandon the contract we've created. */
	ctid = get_active_process_contract_id();

	debug2("%s: abandoning contract id %ld", __func__, ctid);

	snprintf(ctl_path, sizeof(ctl_path),
	    CTFS_ROOT "/process/%ld/ctl", ctid);
	if ((ctl_fd = open64(ctl_path, O_WRONLY)) < 0) {
		error("%s: Error opening process contract "
		    "ctl file: %s", __func__, strerror(errno));
		goto fail;
	}
	if (ct_ctl_abandon(ctl_fd) < 0) {
		error("%s: Error abandoning process contract: %s",
		    __func__, strerror(errno));
		goto fail;
	}
	close(ctl_fd);
	return;

 fail:
	if (tmpl_fd != -1) {
		close(tmpl_fd);
		tmpl_fd = -1;
	}
	if (stat_fd != -1)
		close(stat_fd);
	if (ctl_fd != -1)
		close(ctl_fd);
}
#endif

#ifdef USE_SOLARIS_PROJECTS
#include <sys/task.h>
#include <project.h>

/*
 * Get/set solaris default project.
 * If we fail, just run along gracefully.
 */
void
solaris_set_default_project(struct passwd *pw)
{
	struct project  *defaultproject;
	struct project   tempproject;
	char buf[1024];

	/* get default project, if we fail just return gracefully  */
	if ((defaultproject = getdefaultproj(pw->pw_name, &tempproject, &buf,
	    sizeof(buf))) != NULL) {
		/* set default project */
		if (setproject(defaultproject->pj_name, pw->pw_name,
		    TASK_NORMAL) != 0)
			debug("setproject(%s): %s", defaultproject->pj_name,
			    strerror(errno));
	} else {
		/* debug on getdefaultproj() error */
		debug("getdefaultproj(%s): %s", pw->pw_name, strerror(errno));
	}
}
#endif /* USE_SOLARIS_PROJECTS */

#ifdef USE_SOLARIS_PRIVS
# ifdef HAVE_PRIV_H
#  include <priv.h>
# endif

priv_set_t *
solaris_basic_privset(void)
{
	priv_set_t *pset;

#ifdef HAVE_PRIV_BASICSET
	if ((pset = priv_allocset()) == NULL) {
		error("priv_allocset: %s", strerror(errno));
		return NULL;
	}
	priv_basicset(pset);
#else
	if ((pset = priv_str_to_set("basic", ",", NULL)) == NULL) {
		error("priv_str_to_set: %s", strerror(errno));
		return NULL;
	}
#endif
	return pset;
}

void
solaris_drop_privs_pinfo_net_fork_exec(void)
{
	priv_set_t *pset = NULL, *npset = NULL;

	/*
	 * Note: this variant avoids dropping DAC filesystem rights, in case
	 * the process calling it is running as root and should have the
	 * ability to read/write/chown any file on the system.
	 *
	 * We start with the basic set, then *add* the DAC rights to it while
	 * taking away other parts of BASIC we don't need. Then we intersect
	 * this with our existing PERMITTED set. In this way we keep any
	 * DAC rights we had before, while otherwise reducing ourselves to
	 * the minimum set of privileges we need to proceed.
	 *
	 * This also means we drop any other parts of "root" that we don't
	 * need (e.g. the ability to kill any process, create new device nodes
	 * etc etc).
	 */

	if ((pset = priv_allocset()) == NULL)
		fatal("priv_allocset: %s", strerror(errno));
	if ((npset = solaris_basic_privset()) == NULL)
		fatal("solaris_basic_privset: %s", strerror(errno));

	if (priv_addset(npset, PRIV_FILE_CHOWN) != 0 ||
	    priv_addset(npset, PRIV_FILE_DAC_READ) != 0 ||
	    priv_addset(npset, PRIV_FILE_DAC_SEARCH) != 0 ||
	    priv_addset(npset, PRIV_FILE_DAC_WRITE) != 0 ||
	    priv_addset(npset, PRIV_FILE_OWNER) != 0)
		fatal("priv_addset: %s", strerror(errno));

	if (priv_delset(npset, PRIV_PROC_EXEC) != 0 ||
#ifdef PRIV_NET_ACCESS
	    priv_delset(npset, PRIV_NET_ACCESS) != 0 ||
#endif
	    priv_delset(npset, PRIV_PROC_FORK) != 0 ||
	    priv_delset(npset, PRIV_PROC_INFO) != 0 ||
	    priv_delset(npset, PRIV_PROC_SESSION) != 0)
		fatal("priv_delset: %s", strerror(errno));

	if (getppriv(PRIV_PERMITTED, pset) != 0)
		fatal("getppriv: %s", strerror(errno));

	priv_intersect(pset, npset);

	if (setppriv(PRIV_SET, PRIV_PERMITTED, npset) != 0 ||
	    setppriv(PRIV_SET, PRIV_LIMIT, npset) != 0 ||
	    setppriv(PRIV_SET, PRIV_INHERITABLE, npset) != 0)
		fatal("setppriv: %s", strerror(errno));

	priv_freeset(pset);
	priv_freeset(npset);
}

void
solaris_drop_privs_root_pinfo_net(void)
{
	priv_set_t *pset = NULL;

	/* Start with "basic" and drop everything we don't need. */
	if ((pset = solaris_basic_privset()) == NULL)
		fatal("solaris_basic_privset: %s", strerror(errno));

	if (priv_delset(pset, PRIV_FILE_LINK_ANY) != 0 ||
#ifdef PRIV_NET_ACCESS
	    priv_delset(pset, PRIV_NET_ACCESS) != 0 ||
#endif
	    priv_delset(pset, PRIV_PROC_INFO) != 0 ||
	    priv_delset(pset, PRIV_PROC_SESSION) != 0)
		fatal("priv_delset: %s", strerror(errno));

	if (setppriv(PRIV_SET, PRIV_PERMITTED, pset) != 0 ||
	    setppriv(PRIV_SET, PRIV_LIMIT, pset) != 0 ||
	    setppriv(PRIV_SET, PRIV_INHERITABLE, pset) != 0)
		fatal("setppriv: %s", strerror(errno));

	priv_freeset(pset);
}

void
solaris_drop_privs_root_pinfo_net_exec(void)
{
	priv_set_t *pset = NULL;


	/* Start with "basic" and drop everything we don't need. */
	if ((pset = solaris_basic_privset()) == NULL)
		fatal("solaris_basic_privset: %s", strerror(errno));

	if (priv_delset(pset, PRIV_FILE_LINK_ANY) != 0 ||
#ifdef PRIV_NET_ACCESS
	    priv_delset(pset, PRIV_NET_ACCESS) != 0 ||
#endif
	    priv_delset(pset, PRIV_PROC_EXEC) != 0 ||
	    priv_delset(pset, PRIV_PROC_INFO) != 0)
		fatal("priv_delset: %s", strerror(errno));

	if (setppriv(PRIV_SET, PRIV_PERMITTED, pset) != 0 ||
	    setppriv(PRIV_SET, PRIV_LIMIT, pset) != 0 ||
	    setppriv(PRIV_SET, PRIV_INHERITABLE, pset) != 0)
		fatal("setppriv: %s", strerror(errno));

	priv_freeset(pset);
}

#endif