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Diffstat (limited to 'src/lib/libcrypto/engine/eng_ctrl.c')
-rw-r--r--src/lib/libcrypto/engine/eng_ctrl.c379
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diff --git a/src/lib/libcrypto/engine/eng_ctrl.c b/src/lib/libcrypto/engine/eng_ctrl.c
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index 1a3c25fbae..0000000000
--- a/src/lib/libcrypto/engine/eng_ctrl.c
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1/* $OpenBSD: eng_ctrl.c,v 1.11 2017/01/29 17:49:23 beck Exp $ */
2/* ====================================================================
3 * Copyright (c) 1999-2001 The OpenSSL Project. 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 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * licensing@OpenSSL.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
53 *
54 */
55
56#include <string.h>
57
58#include <openssl/err.h>
59
60#include "eng_int.h"
61
62/* When querying a ENGINE-specific control command's 'description', this string
63 * is used if the ENGINE_CMD_DEFN has cmd_desc set to NULL. */
64static const char *int_no_description = "";
65
66/* These internal functions handle 'CMD'-related control commands when the
67 * ENGINE in question has asked us to take care of it (ie. the ENGINE did not
68 * set the ENGINE_FLAGS_MANUAL_CMD_CTRL flag. */
69
70static int
71int_ctrl_cmd_is_null(const ENGINE_CMD_DEFN *defn)
72{
73 if ((defn->cmd_num == 0) || (defn->cmd_name == NULL))
74 return 1;
75 return 0;
76}
77
78static int
79int_ctrl_cmd_by_name(const ENGINE_CMD_DEFN *defn, const char *s)
80{
81 int idx = 0;
82 while (!int_ctrl_cmd_is_null(defn) &&
83 (strcmp(defn->cmd_name, s) != 0)) {
84 idx++;
85 defn++;
86 }
87 if (int_ctrl_cmd_is_null(defn))
88 /* The given name wasn't found */
89 return -1;
90 return idx;
91}
92
93static int
94int_ctrl_cmd_by_num(const ENGINE_CMD_DEFN *defn, unsigned int num)
95{
96 int idx = 0;
97 /* NB: It is stipulated that 'cmd_defn' lists are ordered by cmd_num. So
98 * our searches don't need to take any longer than necessary. */
99 while (!int_ctrl_cmd_is_null(defn) && (defn->cmd_num < num)) {
100 idx++;
101 defn++;
102 }
103 if (defn->cmd_num == num)
104 return idx;
105 /* The given cmd_num wasn't found */
106 return -1;
107}
108
109static int
110int_ctrl_helper(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
111{
112 int idx;
113 int ret;
114 char *s = (char *)p;
115
116 /* Take care of the easy one first (eg. it requires no searches) */
117 if (cmd == ENGINE_CTRL_GET_FIRST_CMD_TYPE) {
118 if ((e->cmd_defns == NULL) ||
119 int_ctrl_cmd_is_null(e->cmd_defns))
120 return 0;
121 return e->cmd_defns->cmd_num;
122 }
123 /* One or two commands require that "p" be a valid string buffer */
124 if ((cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) ||
125 (cmd == ENGINE_CTRL_GET_NAME_FROM_CMD) ||
126 (cmd == ENGINE_CTRL_GET_DESC_FROM_CMD)) {
127 if (s == NULL) {
128 ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
129 return -1;
130 }
131 }
132 /* Now handle cmd_name -> cmd_num conversion */
133 if (cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) {
134 if ((e->cmd_defns == NULL) ||
135 ((idx = int_ctrl_cmd_by_name(e->cmd_defns, s)) < 0)) {
136 ENGINEerror(ENGINE_R_INVALID_CMD_NAME);
137 return -1;
138 }
139 return e->cmd_defns[idx].cmd_num;
140 }
141 /* For the rest of the commands, the 'long' argument must specify a
142 * valie command number - so we need to conduct a search. */
143 if ((e->cmd_defns == NULL) ||
144 ((idx = int_ctrl_cmd_by_num(e->cmd_defns, (unsigned int)i)) < 0)) {
145 ENGINEerror(ENGINE_R_INVALID_CMD_NUMBER);
146 return -1;
147 }
148 /* Now the logic splits depending on command type */
149 switch (cmd) {
150 case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
151 idx++;
152 if (int_ctrl_cmd_is_null(e->cmd_defns + idx))
153 /* end-of-list */
154 return 0;
155 else
156 return e->cmd_defns[idx].cmd_num;
157 case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
158 return strlen(e->cmd_defns[idx].cmd_name);
159 case ENGINE_CTRL_GET_NAME_FROM_CMD:
160 ret = snprintf(s, strlen(e->cmd_defns[idx].cmd_name) + 1,
161 "%s", e->cmd_defns[idx].cmd_name);
162 if (ret >= (strlen(e->cmd_defns[idx].cmd_name) + 1))
163 ret = -1;
164 return ret;
165 case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
166 if (e->cmd_defns[idx].cmd_desc)
167 return strlen(e->cmd_defns[idx].cmd_desc);
168 return strlen(int_no_description);
169 case ENGINE_CTRL_GET_DESC_FROM_CMD:
170 if (e->cmd_defns[idx].cmd_desc) {
171 ret = snprintf(s,
172 strlen(e->cmd_defns[idx].cmd_desc) + 1,
173 "%s", e->cmd_defns[idx].cmd_desc);
174 if (ret >= strlen(e->cmd_defns[idx].cmd_desc) + 1)
175 ret = -1;
176 return ret;
177 }
178 ret = snprintf(s, strlen(int_no_description) + 1, "%s",
179 int_no_description);
180 if (ret >= strlen(int_no_description) + 1)
181 ret = -1;
182 return ret;
183 case ENGINE_CTRL_GET_CMD_FLAGS:
184 return e->cmd_defns[idx].cmd_flags;
185 }
186
187 /* Shouldn't really be here ... */
188 ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
189 return -1;
190}
191
192int
193ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
194{
195 int ctrl_exists, ref_exists;
196
197 if (e == NULL) {
198 ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
199 return 0;
200 }
201 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
202 ref_exists = ((e->struct_ref > 0) ? 1 : 0);
203 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
204 ctrl_exists = ((e->ctrl == NULL) ? 0 : 1);
205 if (!ref_exists) {
206 ENGINEerror(ENGINE_R_NO_REFERENCE);
207 return 0;
208 }
209 /* Intercept any "root-level" commands before trying to hand them on to
210 * ctrl() handlers. */
211 switch (cmd) {
212 case ENGINE_CTRL_HAS_CTRL_FUNCTION:
213 return ctrl_exists;
214 case ENGINE_CTRL_GET_FIRST_CMD_TYPE:
215 case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
216 case ENGINE_CTRL_GET_CMD_FROM_NAME:
217 case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
218 case ENGINE_CTRL_GET_NAME_FROM_CMD:
219 case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
220 case ENGINE_CTRL_GET_DESC_FROM_CMD:
221 case ENGINE_CTRL_GET_CMD_FLAGS:
222 if (ctrl_exists && !(e->flags & ENGINE_FLAGS_MANUAL_CMD_CTRL))
223 return int_ctrl_helper(e, cmd, i, p, f);
224 if (!ctrl_exists) {
225 ENGINEerror(ENGINE_R_NO_CONTROL_FUNCTION);
226 /* For these cmd-related functions, failure is indicated
227 * by a -1 return value (because 0 is used as a valid
228 * return in some places). */
229 return -1;
230 }
231 default:
232 break;
233 }
234 /* Anything else requires a ctrl() handler to exist. */
235 if (!ctrl_exists) {
236 ENGINEerror(ENGINE_R_NO_CONTROL_FUNCTION);
237 return 0;
238 }
239 return e->ctrl(e, cmd, i, p, f);
240}
241
242int
243ENGINE_cmd_is_executable(ENGINE *e, int cmd)
244{
245 int flags;
246
247 if ((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, cmd,
248 NULL, NULL)) < 0) {
249 ENGINEerror(ENGINE_R_INVALID_CMD_NUMBER);
250 return 0;
251 }
252 if (!(flags & ENGINE_CMD_FLAG_NO_INPUT) &&
253 !(flags & ENGINE_CMD_FLAG_NUMERIC) &&
254 !(flags & ENGINE_CMD_FLAG_STRING))
255 return 0;
256 return 1;
257}
258
259int
260ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name, long i, void *p,
261 void (*f)(void), int cmd_optional)
262{
263 int num;
264
265 if ((e == NULL) || (cmd_name == NULL)) {
266 ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
267 return 0;
268 }
269 if ((e->ctrl == NULL) ||
270 ((num = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FROM_NAME,
271 0, (void *)cmd_name, NULL)) <= 0)) {
272 /* If the command didn't *have* to be supported, we fake
273 * success. This allows certain settings to be specified for
274 * multiple ENGINEs and only require a change of ENGINE id
275 * (without having to selectively apply settings). Eg. changing
276 * from a hardware device back to the regular software ENGINE
277 * without editing the config file, etc. */
278 if (cmd_optional) {
279 ERR_clear_error();
280 return 1;
281 }
282 ENGINEerror(ENGINE_R_INVALID_CMD_NAME);
283 return 0;
284 }
285
286 /* Force the result of the control command to 0 or 1, for the reasons
287 * mentioned before. */
288 if (ENGINE_ctrl(e, num, i, p, f) > 0)
289 return 1;
290
291 return 0;
292}
293
294int
295ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
296 int cmd_optional)
297{
298 int num, flags;
299 long l;
300 char *ptr;
301
302 if ((e == NULL) || (cmd_name == NULL)) {
303 ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
304 return 0;
305 }
306 if ((e->ctrl == NULL) ||
307 ((num = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FROM_NAME, 0,
308 (void *)cmd_name, NULL)) <= 0)) {
309 /* If the command didn't *have* to be supported, we fake
310 * success. This allows certain settings to be specified for
311 * multiple ENGINEs and only require a change of ENGINE id
312 * (without having to selectively apply settings). Eg. changing
313 * from a hardware device back to the regular software ENGINE
314 * without editing the config file, etc. */
315 if (cmd_optional) {
316 ERR_clear_error();
317 return 1;
318 }
319 ENGINEerror(ENGINE_R_INVALID_CMD_NAME);
320 return 0;
321 }
322 if (!ENGINE_cmd_is_executable(e, num)) {
323 ENGINEerror(ENGINE_R_CMD_NOT_EXECUTABLE);
324 return 0;
325 }
326 if ((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num,
327 NULL, NULL)) < 0) {
328 /* Shouldn't happen, given that ENGINE_cmd_is_executable()
329 * returned success. */
330 ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
331 return 0;
332 }
333 /* If the command takes no input, there must be no input. And vice
334 * versa. */
335 if (flags & ENGINE_CMD_FLAG_NO_INPUT) {
336 if (arg != NULL) {
337 ENGINEerror(ENGINE_R_COMMAND_TAKES_NO_INPUT);
338 return 0;
339 }
340 /* We deliberately force the result of ENGINE_ctrl() to 0 or 1
341 * rather than returning it as "return data". This is to ensure
342 * usage of these commands is consistent across applications and
343 * that certain applications don't understand it one way, and
344 * others another. */
345 if (ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
346 return 1;
347 return 0;
348 }
349 /* So, we require input */
350 if (arg == NULL) {
351 ENGINEerror(ENGINE_R_COMMAND_TAKES_INPUT);
352 return 0;
353 }
354 /* If it takes string input, that's easy */
355 if (flags & ENGINE_CMD_FLAG_STRING) {
356 /* Same explanation as above */
357 if (ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
358 return 1;
359 return 0;
360 }
361 /* If it doesn't take numeric either, then it is unsupported for use in
362 * a config-setting situation, which is what this function is for. This
363 * should never happen though, because ENGINE_cmd_is_executable() was
364 * used. */
365 if (!(flags & ENGINE_CMD_FLAG_NUMERIC)) {
366 ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
367 return 0;
368 }
369 l = strtol(arg, &ptr, 10);
370 if ((arg == ptr) || (*ptr != '\0')) {
371 ENGINEerror(ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER);
372 return 0;
373 }
374 /* Force the result of the control command to 0 or 1, for the reasons
375 * mentioned before. */
376 if (ENGINE_ctrl(e, num, l, NULL, NULL) > 0)
377 return 1;
378 return 0;
379}
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