xref: /openbmc/linux/crypto/algboss.c (revision 7e035230) 
1 /*
2  * Create default crypto algorithm instances.
3  *
4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the Free
8  * Software Foundation; either version 2 of the License, or (at your option)
9  * any later version.
10  *
11  */
12 
13 #include <crypto/internal/aead.h>
14 #include <linux/completion.h>
15 #include <linux/ctype.h>
16 #include <linux/err.h>
17 #include <linux/init.h>
18 #include <linux/kthread.h>
19 #include <linux/module.h>
20 #include <linux/notifier.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
24 #include <linux/string.h>
25 
26 #include "internal.h"
27 
28 struct cryptomgr_param {
29 	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
30 
31 	struct {
32 		struct rtattr attr;
33 		struct crypto_attr_type data;
34 	} type;
35 
36 	union {
37 		struct rtattr attr;
38 		struct {
39 			struct rtattr attr;
40 			struct crypto_attr_alg data;
41 		} alg;
42 		struct {
43 			struct rtattr attr;
44 			struct crypto_attr_u32 data;
45 		} nu32;
46 	} attrs[CRYPTO_MAX_ATTRS];
47 
48 	char larval[CRYPTO_MAX_ALG_NAME];
49 	char template[CRYPTO_MAX_ALG_NAME];
50 
51 	struct completion *completion;
52 
53 	u32 otype;
54 	u32 omask;
55 };
56 
57 struct crypto_test_param {
58 	char driver[CRYPTO_MAX_ALG_NAME];
59 	char alg[CRYPTO_MAX_ALG_NAME];
60 	u32 type;
61 };
62 
63 static int cryptomgr_probe(void *data)
64 {
65 	struct cryptomgr_param *param = data;
66 	struct crypto_template *tmpl;
67 	struct crypto_instance *inst;
68 	int err;
69 
70 	tmpl = crypto_lookup_template(param->template);
71 	if (!tmpl)
72 		goto out;
73 
74 	do {
75 		if (tmpl->create) {
76 			err = tmpl->create(tmpl, param->tb);
77 			continue;
78 		}
79 
80 		inst = tmpl->alloc(param->tb);
81 		if (IS_ERR(inst))
82 			err = PTR_ERR(inst);
83 		else if ((err = crypto_register_instance(tmpl, inst)))
84 			tmpl->free(inst);
85 	} while (err == -EAGAIN && !signal_pending(current));
86 
87 	crypto_tmpl_put(tmpl);
88 
89 out:
90 	complete_all(param->completion);
91 	kfree(param);
92 	module_put_and_exit(0);
93 }
94 
95 static int cryptomgr_schedule_probe(struct crypto_larval *larval)
96 {
97 	struct task_struct *thread;
98 	struct cryptomgr_param *param;
99 	const char *name = larval->alg.cra_name;
100 	const char *p;
101 	unsigned int len;
102 	int i;
103 
104 	if (!try_module_get(THIS_MODULE))
105 		goto err;
106 
107 	param = kzalloc(sizeof(*param), GFP_KERNEL);
108 	if (!param)
109 		goto err_put_module;
110 
111 	for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
112 		;
113 
114 	len = p - name;
115 	if (!len || *p != '(')
116 		goto err_free_param;
117 
118 	memcpy(param->template, name, len);
119 
120 	i = 0;
121 	for (;;) {
122 		int notnum = 0;
123 
124 		name = ++p;
125 		len = 0;
126 
127 		for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
128 			notnum |= !isdigit(*p);
129 
130 		if (*p == '(') {
131 			int recursion = 0;
132 
133 			for (;;) {
134 				if (!*++p)
135 					goto err_free_param;
136 				if (*p == '(')
137 					recursion++;
138 				else if (*p == ')' && !recursion--)
139 					break;
140 			}
141 
142 			notnum = 1;
143 			p++;
144 		}
145 
146 		len = p - name;
147 		if (!len)
148 			goto err_free_param;
149 
150 		if (notnum) {
151 			param->attrs[i].alg.attr.rta_len =
152 				sizeof(param->attrs[i].alg);
153 			param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
154 			memcpy(param->attrs[i].alg.data.name, name, len);
155 		} else {
156 			param->attrs[i].nu32.attr.rta_len =
157 				sizeof(param->attrs[i].nu32);
158 			param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
159 			param->attrs[i].nu32.data.num =
160 				simple_strtol(name, NULL, 0);
161 		}
162 
163 		param->tb[i + 1] = &param->attrs[i].attr;
164 		i++;
165 
166 		if (i >= CRYPTO_MAX_ATTRS)
167 			goto err_free_param;
168 
169 		if (*p == ')')
170 			break;
171 
172 		if (*p != ',')
173 			goto err_free_param;
174 	}
175 
176 	if (!i)
177 		goto err_free_param;
178 
179 	param->tb[i + 1] = NULL;
180 
181 	param->type.attr.rta_len = sizeof(param->type);
182 	param->type.attr.rta_type = CRYPTOA_TYPE;
183 	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
184 	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
185 	param->tb[0] = &param->type.attr;
186 
187 	param->otype = larval->alg.cra_flags;
188 	param->omask = larval->mask;
189 
190 	memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
191 
192 	param->completion = &larval->completion;
193 
194 	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
195 	if (IS_ERR(thread))
196 		goto err_free_param;
197 
198 	wait_for_completion_interruptible(&larval->completion);
199 
200 	return NOTIFY_STOP;
201 
202 err_free_param:
203 	kfree(param);
204 err_put_module:
205 	module_put(THIS_MODULE);
206 err:
207 	return NOTIFY_OK;
208 }
209 
210 static int cryptomgr_test(void *data)
211 {
212 	struct crypto_test_param *param = data;
213 	u32 type = param->type;
214 	int err = 0;
215 
216 #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
217 	goto skiptest;
218 #endif
219 
220 	if (type & CRYPTO_ALG_TESTED)
221 		goto skiptest;
222 
223 	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
224 
225 skiptest:
226 	crypto_alg_tested(param->driver, err);
227 
228 	kfree(param);
229 	module_put_and_exit(0);
230 }
231 
232 static int cryptomgr_schedule_test(struct crypto_alg *alg)
233 {
234 	struct task_struct *thread;
235 	struct crypto_test_param *param;
236 	u32 type;
237 
238 	if (!try_module_get(THIS_MODULE))
239 		goto err;
240 
241 	param = kzalloc(sizeof(*param), GFP_KERNEL);
242 	if (!param)
243 		goto err_put_module;
244 
245 	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
246 	memcpy(param->alg, alg->cra_name, sizeof(param->alg));
247 	type = alg->cra_flags;
248 
249 	/* This piece of crap needs to disappear into per-type test hooks. */
250 	if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
251 	       CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
252 	     ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
253 	      CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
254 					  alg->cra_ablkcipher.ivsize)) ||
255 	    (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
256 	     alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
257 		type |= CRYPTO_ALG_TESTED;
258 
259 	param->type = type;
260 
261 	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
262 	if (IS_ERR(thread))
263 		goto err_free_param;
264 
265 	return NOTIFY_STOP;
266 
267 err_free_param:
268 	kfree(param);
269 err_put_module:
270 	module_put(THIS_MODULE);
271 err:
272 	return NOTIFY_OK;
273 }
274 
275 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
276 			    void *data)
277 {
278 	switch (msg) {
279 	case CRYPTO_MSG_ALG_REQUEST:
280 		return cryptomgr_schedule_probe(data);
281 	case CRYPTO_MSG_ALG_REGISTER:
282 		return cryptomgr_schedule_test(data);
283 	}
284 
285 	return NOTIFY_DONE;
286 }
287 
288 static struct notifier_block cryptomgr_notifier = {
289 	.notifier_call = cryptomgr_notify,
290 };
291 
292 static int __init cryptomgr_init(void)
293 {
294 	return crypto_register_notifier(&cryptomgr_notifier);
295 }
296 
297 static void __exit cryptomgr_exit(void)
298 {
299 	int err = crypto_unregister_notifier(&cryptomgr_notifier);
300 	BUG_ON(err);
301 }
302 
303 subsys_initcall(cryptomgr_init);
304 module_exit(cryptomgr_exit);
305 
306 MODULE_LICENSE("GPL");
307 MODULE_DESCRIPTION("Crypto Algorithm Manager");
308