aboutsummaryrefslogtreecommitdiff
path: root/openssl/crypto/engine/eng_ctrl.c
blob: 5ce25d92ec9518508b9e7c3734bf1b59ae8fcc63 (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
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
/* crypto/engine/eng_ctrl.c */
/* ====================================================================
 * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include "eng_int.h"

/* When querying a ENGINE-specific control command's 'description', this string
 * is used if the ENGINE_CMD_DEFN has cmd_desc set to NULL. */
static const char *int_no_description = "";

/* These internal functions handle 'CMD'-related control commands when the
 * ENGINE in question has asked us to take care of it (ie. the ENGINE did not
 * set the ENGINE_FLAGS_MANUAL_CMD_CTRL flag. */

static int int_ctrl_cmd_is_null(const ENGINE_CMD_DEFN *defn)
	{
	if((defn->cmd_num == 0) || (defn->cmd_name == NULL))
		return 1;
	return 0;
	}

static int int_ctrl_cmd_by_name(const ENGINE_CMD_DEFN *defn, const char *s)
	{
	int idx = 0;
	while(!int_ctrl_cmd_is_null(defn) && (strcmp(defn->cmd_name, s) != 0))
		{
		idx++;
		defn++;
		}
	if(int_ctrl_cmd_is_null(defn))
		/* The given name wasn't found */
		return -1;
	return idx;
	}

static int int_ctrl_cmd_by_num(const ENGINE_CMD_DEFN *defn, unsigned int num)
	{
	int idx = 0;
	/* NB: It is stipulated that 'cmd_defn' lists are ordered by cmd_num. So
	 * our searches don't need to take any longer than necessary. */
	while(!int_ctrl_cmd_is_null(defn) && (defn->cmd_num < num))
		{
		idx++;
		defn++;
		}
	if(defn->cmd_num == num)
		return idx;
	/* The given cmd_num wasn't found */
	return -1;
	}

static int int_ctrl_helper(ENGINE *e, int cmd, long i, void *p,
			   void (*f)(void))
	{
	int idx;
	char *s = (char *)p;
	/* Take care of the easy one first (eg. it requires no searches) */
	if(cmd == ENGINE_CTRL_GET_FIRST_CMD_TYPE)
		{
		if((e->cmd_defns == NULL) || int_ctrl_cmd_is_null(e->cmd_defns))
			return 0;
		return e->cmd_defns->cmd_num;
		}
	/* One or two commands require that "p" be a valid string buffer */
	if((cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) ||
			(cmd == ENGINE_CTRL_GET_NAME_FROM_CMD) ||
			(cmd == ENGINE_CTRL_GET_DESC_FROM_CMD))
		{
		if(s == NULL)
			{
			ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
				ERR_R_PASSED_NULL_PARAMETER);
			return -1;
			}
		}
	/* Now handle cmd_name -> cmd_num conversion */
	if(cmd == ENGINE_CTRL_GET_CMD_FROM_NAME)
		{
		if((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_name(
						e->cmd_defns, s)) < 0))
			{
			ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
				ENGINE_R_INVALID_CMD_NAME);
			return -1;
			}
		return e->cmd_defns[idx].cmd_num;
		}
	/* For the rest of the commands, the 'long' argument must specify a
	 * valie command number - so we need to conduct a search. */
	if((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_num(e->cmd_defns,
					(unsigned int)i)) < 0))
		{
		ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
			ENGINE_R_INVALID_CMD_NUMBER);
		return -1;
		}
	/* Now the logic splits depending on command type */
	switch(cmd)
		{
	case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
		idx++;
		if(int_ctrl_cmd_is_null(e->cmd_defns + idx))
			/* end-of-list */
			return 0;
		else
			return e->cmd_defns[idx].cmd_num;
	case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
		return strlen(e->cmd_defns[idx].cmd_name);
	case ENGINE_CTRL_GET_NAME_FROM_CMD:
		return BIO_snprintf(s,strlen(e->cmd_defns[idx].cmd_name) + 1,
				    "%s", e->cmd_defns[idx].cmd_name);
	case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
		if(e->cmd_defns[idx].cmd_desc)
			return strlen(e->cmd_defns[idx].cmd_desc);
		return strlen(int_no_description);
	case ENGINE_CTRL_GET_DESC_FROM_CMD:
		if(e->cmd_defns[idx].cmd_desc)
			return BIO_snprintf(s,
					    strlen(e->cmd_defns[idx].cmd_desc) + 1,
					    "%s", e->cmd_defns[idx].cmd_desc);
		return BIO_snprintf(s, strlen(int_no_description) + 1,"%s",
				    int_no_description);
	case ENGINE_CTRL_GET_CMD_FLAGS:
		return e->cmd_defns[idx].cmd_flags;
		}
	/* Shouldn't really be here ... */
	ENGINEerr(ENGINE_F_INT_CTRL_HELPER,ENGINE_R_INTERNAL_LIST_ERROR);
	return -1;
	}

int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
	{
	int ctrl_exists, ref_exists;
	if(e == NULL)
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL,ERR_R_PASSED_NULL_PARAMETER);
		return 0;
		}
	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
	ref_exists = ((e->struct_ref > 0) ? 1 : 0);
	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
	ctrl_exists = ((e->ctrl == NULL) ? 0 : 1);
	if(!ref_exists)
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_REFERENCE);
		return 0;
		}
	/* Intercept any "root-level" commands before trying to hand them on to
	 * ctrl() handlers. */
	switch(cmd)
		{
	case ENGINE_CTRL_HAS_CTRL_FUNCTION:
		return ctrl_exists;
	case ENGINE_CTRL_GET_FIRST_CMD_TYPE:
	case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
	case ENGINE_CTRL_GET_CMD_FROM_NAME:
	case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
	case ENGINE_CTRL_GET_NAME_FROM_CMD:
	case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
	case ENGINE_CTRL_GET_DESC_FROM_CMD:
	case ENGINE_CTRL_GET_CMD_FLAGS:
		if(ctrl_exists && !(e->flags & ENGINE_FLAGS_MANUAL_CMD_CTRL))
			return int_ctrl_helper(e,cmd,i,p,f);
		if(!ctrl_exists)
			{
			ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_CONTROL_FUNCTION);
			/* For these cmd-related functions, failure is indicated
			 * by a -1 return value (because 0 is used as a valid
			 * return in some places). */
			return -1;
			}
	default:
		break;
		}
	/* Anything else requires a ctrl() handler to exist. */
	if(!ctrl_exists)
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_CONTROL_FUNCTION);
		return 0;
		}
	return e->ctrl(e, cmd, i, p, f);
	}

int ENGINE_cmd_is_executable(ENGINE *e, int cmd)
	{
	int flags;
	if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, cmd, NULL, NULL)) < 0)
		{
		ENGINEerr(ENGINE_F_ENGINE_CMD_IS_EXECUTABLE,
			ENGINE_R_INVALID_CMD_NUMBER);
		return 0;
		}
	if(!(flags & ENGINE_CMD_FLAG_NO_INPUT) &&
			!(flags & ENGINE_CMD_FLAG_NUMERIC) &&
			!(flags & ENGINE_CMD_FLAG_STRING))
		return 0;
	return 1;
	}

int ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name,
        long i, void *p, void (*f)(void), int cmd_optional)
        {
	int num;

	if((e == NULL) || (cmd_name == NULL))
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD,
			ERR_R_PASSED_NULL_PARAMETER);
		return 0;
		}
	if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
					ENGINE_CTRL_GET_CMD_FROM_NAME,
					0, (void *)cmd_name, NULL)) <= 0))
		{
		/* If the command didn't *have* to be supported, we fake
		 * success. This allows certain settings to be specified for
		 * multiple ENGINEs and only require a change of ENGINE id
		 * (without having to selectively apply settings). Eg. changing
		 * from a hardware device back to the regular software ENGINE
		 * without editing the config file, etc. */
		if(cmd_optional)
			{
			ERR_clear_error();
			return 1;
			}
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD,
			ENGINE_R_INVALID_CMD_NAME);
		return 0;
		}
	/* Force the result of the control command to 0 or 1, for the reasons
	 * mentioned before. */
        if (ENGINE_ctrl(e, num, i, p, f) > 0)
                return 1;
        return 0;
        }

int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
				int cmd_optional)
	{
	int num, flags;
	long l;
	char *ptr;
	if((e == NULL) || (cmd_name == NULL))
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
			ERR_R_PASSED_NULL_PARAMETER);
		return 0;
		}
	if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
					ENGINE_CTRL_GET_CMD_FROM_NAME,
					0, (void *)cmd_name, NULL)) <= 0))
		{
		/* If the command didn't *have* to be supported, we fake
		 * success. This allows certain settings to be specified for
		 * multiple ENGINEs and only require a change of ENGINE id
		 * (without having to selectively apply settings). Eg. changing
		 * from a hardware device back to the regular software ENGINE
		 * without editing the config file, etc. */
		if(cmd_optional)
			{
			ERR_clear_error();
			return 1;
			}
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
			ENGINE_R_INVALID_CMD_NAME);
		return 0;
		}
	if(!ENGINE_cmd_is_executable(e, num))
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
			ENGINE_R_CMD_NOT_EXECUTABLE);
		return 0;
		}
	if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num, NULL, NULL)) < 0)
		{
		/* Shouldn't happen, given that ENGINE_cmd_is_executable()
		 * returned success. */
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
			ENGINE_R_INTERNAL_LIST_ERROR);
		return 0;
		}
	/* If the command takes no input, there must be no input. And vice
	 * versa. */
	if(flags & ENGINE_CMD_FLAG_NO_INPUT)
		{
		if(arg != NULL)
			{
			ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
				ENGINE_R_COMMAND_TAKES_NO_INPUT);
			return 0;
			}
		/* We deliberately force the result of ENGINE_ctrl() to 0 or 1
		 * rather than returning it as "return data". This is to ensure
		 * usage of these commands is consistent across applications and
		 * that certain applications don't understand it one way, and
		 * others another. */
		if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
			return 1;
		return 0;
		}
	/* So, we require input */
	if(arg == NULL)
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
			ENGINE_R_COMMAND_TAKES_INPUT);
		return 0;
		}
	/* If it takes string input, that's easy */
	if(flags & ENGINE_CMD_FLAG_STRING)
		{
		/* Same explanation as above */
		if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
			return 1;
		return 0;
		}
	/* If it doesn't take numeric either, then it is unsupported for use in
	 * a config-setting situation, which is what this function is for. This
	 * should never happen though, because ENGINE_cmd_is_executable() was
	 * used. */
	if(!(flags & ENGINE_CMD_FLAG_NUMERIC))
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
			ENGINE_R_INTERNAL_LIST_ERROR);
		return 0;
		}
	l = strtol(arg, &ptr, 10);
	if((arg == ptr) || (*ptr != '\0'))
		{
		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
			ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER);
		return 0;
		}
	/* Force the result of the control command to 0 or 1, for the reasons
	 * mentioned before. */
	if(ENGINE_ctrl(e, num, l, NULL, NULL) > 0)
		return 1;
	return 0;
	}