1/*-
2 * Copyright (c) 2011-2014 Dag-Erling Sm��rgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote
14 *    products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifdef HAVE_CONFIG_H
31# include "config.h"
32#endif
33
34#include <ctype.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <unistd.h>
39
40#include <security/pam_appl.h>
41
42#include "openpam_impl.h"
43#include "openpam_asprintf.h"
44
45static char *
46openpam_chain_name(const char *service, pam_facility_t fclt)
47{
48	const char *facility = pam_facility_name[fclt];
49	char *name;
50
51	if (asprintf(&name, "pam_%s_%s", service, facility) == -1)
52		return (NULL);
53	return (name);
54}
55
56static char *
57openpam_facility_index_name(pam_facility_t fclt)
58{
59	const char *facility = pam_facility_name[fclt];
60	char *name, *p;
61
62	if (asprintf(&name, "PAM_%s", facility) == -1)
63		return (NULL);
64	for (p = name + 4; *p; ++p)
65		*p = toupper((unsigned char)*p);
66	return (name);
67}
68
69int
70openpam_dump_chain(const char *name, pam_chain_t *chain)
71{
72	char *modname, **opt, *p;
73	int i;
74
75	for (i = 0; chain != NULL; ++i, chain = chain->next) {
76		/* declare the module's struct pam_module */
77		modname = strrchr(chain->module->path, '/');
78		modname = strdup(modname ? modname : chain->module->path);
79		if (modname == NULL)
80			return (PAM_BUF_ERR);
81		for (p = modname; *p && *p != '.'; ++p)
82			/* nothing */ ;
83		*p = '\0';
84		printf("extern struct pam_module %s_pam_module;\n", modname);
85		/* module arguments */
86		printf("static char *%s_%d_optv[] = {\n", name, i);
87		for (opt = chain->optv; *opt; ++opt) {
88			printf("\t\"");
89			for (p = *opt; *p; ++p) {
90				if (isprint((unsigned char)*p) && *p != '"')
91					printf("%c", *p);
92				else
93					printf("\\x%02x", (unsigned char)*p);
94			}
95			printf("\",\n");
96		}
97		printf("\tNULL,\n");
98		printf("};\n");
99		/* next module in chain */
100		if (chain->next != NULL)
101			printf("static pam_chain_t %s_%d;\n", name, i + 1);
102		/* chain entry */
103		printf("static pam_chain_t %s_%d = {\n", name, i);
104		printf("\t.module = &%s_pam_module,\n", modname);
105		printf("\t.flag = 0x%08x,\n", chain->flag);
106		printf("\t.optc = %d,\n", chain->optc);
107		printf("\t.optv = %s_%d_optv,\n", name, i);
108		if (chain->next)
109			printf("\t.next = &%s_%d,\n", name, i + 1);
110		else
111			printf("\t.next = NULL,\n");
112		printf("};\n");
113		free(modname);
114	}
115	return (PAM_SUCCESS);
116}
117
118int
119openpam_dump_policy(const char *service)
120{
121	pam_handle_t *pamh;
122	char *name;
123	int fclt, ret;
124
125	if ((pamh = calloc(1, sizeof *pamh)) == NULL)
126		return (PAM_BUF_ERR);
127	if ((ret = openpam_configure(pamh, service)) != PAM_SUCCESS)
128		return (ret);
129	for (fclt = 0; fclt < PAM_NUM_FACILITIES; ++fclt) {
130		if (pamh->chains[fclt] != NULL) {
131			if ((name = openpam_chain_name(service, fclt)) == NULL)
132				return (PAM_BUF_ERR);
133			ret = openpam_dump_chain(name, pamh->chains[fclt]);
134			free(name);
135			if (ret != PAM_SUCCESS)
136				return (ret);
137		}
138	}
139	printf("static pam_policy_t pam_%s_policy = {\n", service);
140	printf("\t.service = \"%s\",\n", service);
141	printf("\t.chains = {\n");
142	for (fclt = 0; fclt < PAM_NUM_FACILITIES; ++fclt) {
143		if ((name = openpam_facility_index_name(fclt)) == NULL)
144			return (PAM_BUF_ERR);
145		printf("\t\t[%s] = ", name);
146		free(name);
147		if (pamh->chains[fclt] != NULL) {
148			if ((name = openpam_chain_name(service, fclt)) == NULL)
149				return (PAM_BUF_ERR);
150			printf("&%s_0,\n", name);
151			free(name);
152		} else {
153			printf("NULL,\n");
154		}
155	}
156	printf("\t},\n");
157	printf("};\n");
158	free(pamh);
159	return (PAM_SUCCESS);
160}
161
162static void
163usage(void)
164{
165
166	fprintf(stderr, "usage: openpam_dump_policy [-d] policy ...\n");
167	exit(1);
168}
169
170int
171main(int argc, char *argv[])
172{
173	int i, opt;
174
175	while ((opt = getopt(argc, argv, "d")) != -1)
176		switch (opt) {
177		case 'd':
178			openpam_debug = 1;
179			break;
180		default:
181			usage();
182		}
183
184	argc -= optind;
185	argv += optind;
186
187	if (argc < 1)
188		usage();
189
190	printf("#include <security/pam_appl.h>\n");
191	printf("#include \"openpam_impl.h\"\n");
192	for (i = 0; i < argc; ++i)
193		openpam_dump_policy(argv[i]);
194	printf("pam_policy_t *pam_embedded_policies[] = {\n");
195	for (i = 0; i < argc; ++i)
196		printf("\t&pam_%s_policy,\n", argv[i]);
197	printf("\tNULL,\n");
198	printf("};\n");
199	exit(0);
200}
201