[apple/xnu.git] / bsd / kern / sys_persona.c

/*
 * Copyright (c) 2015 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kernel_types.h>
#include <sys/sysproto.h>

#include <sys/kauth.h>
#include <sys/malloc.h>
#include <sys/persona.h>
#include <sys/proc.h>

#include <libkern/libkern.h>

static int kpersona_copyin(user_addr_t infop, struct kpersona_info *kinfo)
{
	uint32_t info_v = 0;
	int error;

	error = copyin(infop, &info_v, sizeof(info_v));
	if (error)
		return error;

	/* only support a single version of the struct for now */
	if (info_v != PERSONA_INFO_V1)
		return EINVAL;

	error = copyin(infop, kinfo, sizeof(*kinfo));

	/* enforce NULL termination on strings */
	kinfo->persona_name[MAXLOGNAME] = 0;

	return error;
}

static int kpersona_copyout(struct kpersona_info *kinfo, user_addr_t infop)
{
	uint32_t info_v;
	int error;

	error = copyin(infop, &info_v, sizeof(info_v));
	if (error)
		return error;

	/* only support a single version of the struct for now */
	/* TODO: in the future compare info_v to kinfo->persona_info_version */
	if (info_v != PERSONA_INFO_V1)
		return EINVAL;

	error = copyout(kinfo, infop, sizeof(*kinfo));
	return error;
}


static int kpersona_alloc_syscall(user_addr_t infop, user_addr_t idp)
{
	int error;
	struct kpersona_info kinfo;
	struct persona *persona;
	uid_t id = PERSONA_ID_NONE;
	const char *login;

	/*
	 * TODO: rdar://problem/19981151
	 * Add entitlement check!
	 */
	if (!kauth_cred_issuser(kauth_cred_get()))
		return EPERM;

	error = kpersona_copyin(infop, &kinfo);
	if (error)
		return error;

	login = kinfo.persona_name[0] ? kinfo.persona_name : NULL;
	if (kinfo.persona_id != PERSONA_ID_NONE && kinfo.persona_id != (uid_t)0)
		id = kinfo.persona_id;

	error = 0;
	persona = persona_alloc(id, login, kinfo.persona_type, &error);
	if (!persona)
		return error;

	if (kinfo.persona_gid) {
		error = persona_set_gid(persona, kinfo.persona_gid);
		if (error)
			goto out_error;
	}

	if (kinfo.persona_ngroups > 0) {
		/* force gmuid 0 to *opt-out* of memberd */
		if (kinfo.persona_gmuid == 0)
			kinfo.persona_gmuid = KAUTH_UID_NONE;

		error = persona_set_groups(persona, kinfo.persona_groups,
					   kinfo.persona_ngroups,
					   kinfo.persona_gmuid);
		if (error)
			goto out_error;
	}

	error = copyout(&persona->pna_id, idp, sizeof(persona->pna_id));
	if (error)
		goto out_error;
	error = kpersona_copyout(&kinfo, infop);

	/*
	 * On success, we have a persona structure in the global list with a
	 * single reference count on it. The corresponding _dealloc() call
	 * will release this reference.
	 */
	return error;

out_error:
	printf("%s:  ERROR:%d\n", __func__, error);
	if (persona)
		persona_put(persona);
	return error;
}

static int kpersona_dealloc_syscall(user_addr_t idp)
{
	int error;
	uid_t persona_id;
	struct persona *persona;

	if (!kauth_cred_issuser(kauth_cred_get()))
		return EPERM;

	error = copyin(idp, &persona_id, sizeof(persona_id));
	if (error)
		return error;

	persona = persona_lookup(persona_id);
	if (!persona)
		return ESRCH;

	/* invalidate the persona (deny subsequent spawn/fork) */
	error = persona_invalidate(persona);

	/* one reference from the _lookup() */
	persona_put(persona);

	/* one reference from the _alloc() */
	if (!error)
		persona_put(persona);

	return error;
}

static int kpersona_get_syscall(user_addr_t idp)
{
	int error;
	struct persona *persona = current_persona_get();

	if (!persona)
		return ESRCH;

	error = copyout(&persona->pna_id, idp, sizeof(persona->pna_id));
	persona_put(persona);

	return error;
}

static int kpersona_info_syscall(user_addr_t idp, user_addr_t infop)
{
	int error;
	uid_t persona_id;
	struct persona *persona;
	struct kpersona_info kinfo;

	error = copyin(idp, &persona_id, sizeof(persona_id));
	if (error)
		return error;

	/*
	 * TODO: rdar://problem/19981151
	 * Add entitlement check!
	 */

	persona = persona_lookup(persona_id);
	if (!persona)
		return ESRCH;

	persona_dbg("FOUND: persona:%p, id:%d, gid:%d, login:\"%s\"",
		    persona, persona->pna_id, persona_get_gid(persona),
		    persona->pna_login);

	memset(&kinfo, 0, sizeof(kinfo));
	kinfo.persona_info_version = PERSONA_INFO_V1;
	kinfo.persona_id = persona->pna_id;
	kinfo.persona_type = persona->pna_type;
	kinfo.persona_gid = persona_get_gid(persona);
	int ngroups = 0;
	persona_get_groups(persona, &ngroups, kinfo.persona_groups, NGROUPS);
	kinfo.persona_ngroups = ngroups;
	kinfo.persona_gmuid = persona_get_gmuid(persona);

	/*
	 * NULL termination is assured b/c persona_name is
	 * exactly MAXLOGNAME + 1 bytes (and has been memset to 0)
	 */
	strncpy(kinfo.persona_name, persona->pna_login, MAXLOGNAME);

	persona_put(persona);

	error = kpersona_copyout(&kinfo, infop);

	return error;
}

static int kpersona_pidinfo_syscall(user_addr_t idp, user_addr_t infop)
{
	int error;
	pid_t pid;
	struct persona *persona;
	struct kpersona_info kinfo;

	error = copyin(idp, &pid, sizeof(pid));
	if (error)
		return error;

	if (!kauth_cred_issuser(kauth_cred_get())
	    && (pid != current_proc()->p_pid))
		return EPERM;

	persona = persona_proc_get(pid);
	if (!persona)
		return ESRCH;

	memset(&kinfo, 0, sizeof(kinfo));
	kinfo.persona_info_version = PERSONA_INFO_V1;
	kinfo.persona_id = persona->pna_id;
	kinfo.persona_type = persona->pna_type;
	kinfo.persona_gid = persona_get_gid(persona);
	int ngroups = 0;
	persona_get_groups(persona, &ngroups, kinfo.persona_groups, NGROUPS);
	kinfo.persona_ngroups = ngroups;
	kinfo.persona_gmuid = persona_get_gmuid(persona);

	strncpy(kinfo.persona_name, persona->pna_login, MAXLOGNAME);

	persona_put(persona);

	error = kpersona_copyout(&kinfo, infop);

	return error;
}

static int kpersona_find_syscall(user_addr_t infop, user_addr_t idp, user_addr_t idlenp)
{
	int error;
	struct kpersona_info kinfo;
	const char *login;
	size_t u_idlen, k_idlen = 0;
	struct persona **persona = NULL;

	error = copyin(idlenp, &u_idlen, sizeof(u_idlen));
	if (error)
		return error;

	if (u_idlen > g_max_personas)
		u_idlen = g_max_personas;

	error = kpersona_copyin(infop, &kinfo);
	if (error)
		goto out;

	login = kinfo.persona_name[0] ? kinfo.persona_name : NULL;

	if (u_idlen > 0) {
		MALLOC(persona, struct persona **, sizeof(*persona) * u_idlen,
		       M_TEMP, M_WAITOK|M_ZERO);
		if (!persona) {
			error = ENOMEM;
			goto out;
		}
	}

	k_idlen = u_idlen;
	error = persona_find(login, kinfo.persona_id, persona, &k_idlen);
	if (error)
		goto out;

	/* copyout all the IDs of each persona we found */
	for (size_t i = 0; i < k_idlen; i++) {
		if (i >= u_idlen)
			break;
		error = copyout(&persona[i]->pna_id,
				idp + (i * sizeof(persona[i]->pna_id)),
				sizeof(persona[i]->pna_id));
		if (error)
			goto out;
	}

out:
	if (persona) {
		for (size_t i = 0; i < u_idlen; i++)
			persona_put(persona[i]);
		FREE(persona, M_TEMP);
	}

	(void)copyout(&k_idlen, idlenp, sizeof(u_idlen));

	return error;
}


/*
 * Syscall entry point / demux.
 */
int persona(__unused proc_t p, struct persona_args *pargs, __unused int32_t *retval)
{
	int error;
	uint32_t op = pargs->operation;
	/* uint32_t flags = pargs->flags; */
	user_addr_t infop = pargs->info;
	user_addr_t idp = pargs->id;

	switch (op) {
	case PERSONA_OP_ALLOC:
		error = kpersona_alloc_syscall(infop, idp);
		break;
	case PERSONA_OP_DEALLOC:
		error = kpersona_dealloc_syscall(idp);
		break;
	case PERSONA_OP_GET:
		error = kpersona_get_syscall(idp);
		break;
	case PERSONA_OP_INFO:
		error = kpersona_info_syscall(idp, infop);
		break;
	case PERSONA_OP_PIDINFO:
		error = kpersona_pidinfo_syscall(idp, infop);
		break;
	case PERSONA_OP_FIND:
		error = kpersona_find_syscall(infop, idp, pargs->idlen);
		break;
	default:
		error = ENOSYS;
		break;
	}

	return error;
}
Commit	Line	Data
490019cf A	1	/*
	2	* Copyright (c) 2015 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	#include <sys/param.h>
	29	#include <sys/kernel.h>
	30	#include <sys/kernel_types.h>
	31	#include <sys/sysproto.h>
	32
	33	#include <sys/kauth.h>
	34	#include <sys/malloc.h>
	35	#include <sys/persona.h>
	36	#include <sys/proc.h>
	37
	38	#include <libkern/libkern.h>
	39
	40	static int kpersona_copyin(user_addr_t infop, struct kpersona_info *kinfo)
	41	{
	42	uint32_t info_v = 0;
	43	int error;
	44
	45	error = copyin(infop, &info_v, sizeof(info_v));
	46	if (error)
	47	return error;
	48
	49	/* only support a single version of the struct for now */
	50	if (info_v != PERSONA_INFO_V1)
	51	return EINVAL;
	52
	53	error = copyin(infop, kinfo, sizeof(*kinfo));
	54
	55	/* enforce NULL termination on strings */
	56	kinfo->persona_name[MAXLOGNAME] = 0;
	57
	58	return error;
	59	}
	60
	61	static int kpersona_copyout(struct kpersona_info *kinfo, user_addr_t infop)
	62	{
	63	uint32_t info_v;
	64	int error;
65
66	error = copyin(infop, &info_v, sizeof(info_v));
67	if (error)
68	return error;
69
70	/* only support a single version of the struct for now */
71	/* TODO: in the future compare info_v to kinfo->persona_info_version */
72	if (info_v != PERSONA_INFO_V1)
73	return EINVAL;
74
75	error = copyout(kinfo, infop, sizeof(*kinfo));
76	return error;
77	}
78
79
80	static int kpersona_alloc_syscall(user_addr_t infop, user_addr_t idp)
81	{
82	int error;
83	struct kpersona_info kinfo;
84	struct persona *persona;
85	uid_t id = PERSONA_ID_NONE;
86	const char *login;
87
88	/*
89	* TODO: rdar://problem/19981151
90	* Add entitlement check!
91	*/
92	if (!kauth_cred_issuser(kauth_cred_get()))
93	return EPERM;
94
95	error = kpersona_copyin(infop, &kinfo);
96	if (error)
97	return error;
98
99	login = kinfo.persona_name[0] ? kinfo.persona_name : NULL;
100	if (kinfo.persona_id != PERSONA_ID_NONE && kinfo.persona_id != (uid_t)0)
101	id = kinfo.persona_id;
102
103	error = 0;
104	persona = persona_alloc(id, login, kinfo.persona_type, &error);
105	if (!persona)
106	return error;
107
108	if (kinfo.persona_gid) {
109	error = persona_set_gid(persona, kinfo.persona_gid);
110	if (error)
111	goto out_error;
112	}
113
114	if (kinfo.persona_ngroups > 0) {
115	/* force gmuid 0 to opt-out of memberd */
116	if (kinfo.persona_gmuid == 0)
117	kinfo.persona_gmuid = KAUTH_UID_NONE;
118
119	error = persona_set_groups(persona, kinfo.persona_groups,
120	kinfo.persona_ngroups,
121	kinfo.persona_gmuid);
122	if (error)
123	goto out_error;
124	}
125
126	error = copyout(&persona->pna_id, idp, sizeof(persona->pna_id));
127	if (error)
128	goto out_error;
129	error = kpersona_copyout(&kinfo, infop);
130
131	/*
132	* On success, we have a persona structure in the global list with a
133	* single reference count on it. The corresponding _dealloc() call
134	* will release this reference.
135	*/
136	return error;
137
138	out_error:
139	printf("%s: ERROR:%d\n", __func__, error);
140	if (persona)
141	persona_put(persona);
142	return error;
143	}
144
145	static int kpersona_dealloc_syscall(user_addr_t idp)
146	{
147	int error;
148	uid_t persona_id;
149	struct persona *persona;
150
151	if (!kauth_cred_issuser(kauth_cred_get()))
152	return EPERM;
153
154	error = copyin(idp, &persona_id, sizeof(persona_id));
155	if (error)
156	return error;
157
158	persona = persona_lookup(persona_id);
159	if (!persona)
160	return ESRCH;
161
162	/* invalidate the persona (deny subsequent spawn/fork) */
163	error = persona_invalidate(persona);
164
165	/* one reference from the _lookup() */
166	persona_put(persona);
167
168	/* one reference from the _alloc() */
169	if (!error)
170	persona_put(persona);
171
172	return error;
173	}
174
175	static int kpersona_get_syscall(user_addr_t idp)
176	{
177	int error;
178	struct persona *persona = current_persona_get();
179
180	if (!persona)
181	return ESRCH;
182
183	error = copyout(&persona->pna_id, idp, sizeof(persona->pna_id));
184	persona_put(persona);
185
186	return error;
187	}
188
189	static int kpersona_info_syscall(user_addr_t idp, user_addr_t infop)
190	{
191	int error;
192	uid_t persona_id;
193	struct persona *persona;
194	struct kpersona_info kinfo;
195
196	error = copyin(idp, &persona_id, sizeof(persona_id));
197	if (error)
198	return error;
199
200	/*
201	* TODO: rdar://problem/19981151
202	* Add entitlement check!
203	*/
204
205	persona = persona_lookup(persona_id);
206	if (!persona)
207	return ESRCH;
208
209	persona_dbg("FOUND: persona:%p, id:%d, gid:%d, login:\"%s\"",
210	persona, persona->pna_id, persona_get_gid(persona),
211	persona->pna_login);
212
213	memset(&kinfo, 0, sizeof(kinfo));
214	kinfo.persona_info_version = PERSONA_INFO_V1;
215	kinfo.persona_id = persona->pna_id;
216	kinfo.persona_type = persona->pna_type;
217	kinfo.persona_gid = persona_get_gid(persona);
218	int ngroups = 0;
219	persona_get_groups(persona, &ngroups, kinfo.persona_groups, NGROUPS);
220	kinfo.persona_ngroups = ngroups;
221	kinfo.persona_gmuid = persona_get_gmuid(persona);
222
223	/*
224	* NULL termination is assured b/c persona_name is
225	* exactly MAXLOGNAME + 1 bytes (and has been memset to 0)
226	*/
227	strncpy(kinfo.persona_name, persona->pna_login, MAXLOGNAME);
228
229	persona_put(persona);
230
231	error = kpersona_copyout(&kinfo, infop);
232
233	return error;
234	}
235
236	static int kpersona_pidinfo_syscall(user_addr_t idp, user_addr_t infop)
237	{
238	int error;
239	pid_t pid;
240	struct persona *persona;
241	struct kpersona_info kinfo;
242
243	error = copyin(idp, &pid, sizeof(pid));
244	if (error)
245	return error;
246
247	if (!kauth_cred_issuser(kauth_cred_get())
248	&& (pid != current_proc()->p_pid))
249	return EPERM;
250
251	persona = persona_proc_get(pid);
252	if (!persona)
253	return ESRCH;
254
255	memset(&kinfo, 0, sizeof(kinfo));
256	kinfo.persona_info_version = PERSONA_INFO_V1;
257	kinfo.persona_id = persona->pna_id;
258	kinfo.persona_type = persona->pna_type;
259	kinfo.persona_gid = persona_get_gid(persona);
260	int ngroups = 0;
261	persona_get_groups(persona, &ngroups, kinfo.persona_groups, NGROUPS);
262	kinfo.persona_ngroups = ngroups;
263	kinfo.persona_gmuid = persona_get_gmuid(persona);
264
265	strncpy(kinfo.persona_name, persona->pna_login, MAXLOGNAME);
266
267	persona_put(persona);
268
269	error = kpersona_copyout(&kinfo, infop);
270
271	return error;
272	}
273
274	static int kpersona_find_syscall(user_addr_t infop, user_addr_t idp, user_addr_t idlenp)
275	{
276	int error;
277	struct kpersona_info kinfo;
278	const char *login;
279	size_t u_idlen, k_idlen = 0;
280	struct persona **persona = NULL;
281
282	error = copyin(idlenp, &u_idlen, sizeof(u_idlen));
283	if (error)
284	return error;
285
286	if (u_idlen > g_max_personas)
287	u_idlen = g_max_personas;
288
289	error = kpersona_copyin(infop, &kinfo);
290	if (error)
291	goto out;
292
293	login = kinfo.persona_name[0] ? kinfo.persona_name : NULL;
294
295	if (u_idlen > 0) {
296	MALLOC(persona, struct persona *, sizeof(persona) * u_idlen,
297	M_TEMP, M_WAITOK\|M_ZERO);
298	if (!persona) {
299	error = ENOMEM;
300	goto out;
301	}
302	}
303
304	k_idlen = u_idlen;
305	error = persona_find(login, kinfo.persona_id, persona, &k_idlen);
306	if (error)
307	goto out;
308
309	/* copyout all the IDs of each persona we found */
310	for (size_t i = 0; i < k_idlen; i++) {
311	if (i >= u_idlen)
312	break;
313	error = copyout(&persona[i]->pna_id,
314	idp + (i * sizeof(persona[i]->pna_id)),
315	sizeof(persona[i]->pna_id));
316	if (error)
317	goto out;
318	}
319
320	out:
321	if (persona) {
322	for (size_t i = 0; i < u_idlen; i++)
323	persona_put(persona[i]);
324	FREE(persona, M_TEMP);
325	}
326
327	(void)copyout(&k_idlen, idlenp, sizeof(u_idlen));
328
329	return error;
330	}
331
332
333	/*
334	* Syscall entry point / demux.
335	*/
336	int persona(__unused proc_t p, struct persona_args pargs, __unused int32_t retval)
337	{
338	int error;
339	uint32_t op = pargs->operation;
340	/* uint32_t flags = pargs->flags; */
341	user_addr_t infop = pargs->info;
342	user_addr_t idp = pargs->id;
343
344	switch (op) {
345	case PERSONA_OP_ALLOC:
346	error = kpersona_alloc_syscall(infop, idp);
347	break;
348	case PERSONA_OP_DEALLOC:
349	error = kpersona_dealloc_syscall(idp);
350	break;
351	case PERSONA_OP_GET:
352	error = kpersona_get_syscall(idp);
353	break;
354	case PERSONA_OP_INFO:
355	error = kpersona_info_syscall(idp, infop);
356	break;
357	case PERSONA_OP_PIDINFO:
358	error = kpersona_pidinfo_syscall(idp, infop);
359	break;
360	case PERSONA_OP_FIND:
361	error = kpersona_find_syscall(infop, idp, pargs->idlen);
362	break;
363	default:
364	error = ENOSYS;
365	break;
366	}
367
368	return error;
369	}