76522cd3770f26a047815345c6541f4e5f25d398
[openssl.git] / crypto / param_build.c
1 /*
2  * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
3  * Copyright (c) 2019, Oracle and/or its affiliates.  All rights reserved.
4  *
5  * Licensed under the Apache License 2.0 (the "License").  You may not use
6  * this file except in compliance with the License.  You can obtain a copy
7  * in the file LICENSE in the source distribution or at
8  * https://www.openssl.org/source/license.html
9  */
10
11 #include <string.h>
12 #include <openssl/err.h>
13 #include <openssl/cryptoerr.h>
14 #include <openssl/params.h>
15 #include <openssl/types.h>
16 #include <openssl/safestack.h>
17 #include "internal/cryptlib.h"
18 #include "openssl/param_build.h"
19
20 /*
21  * Special internal param type to indicate the end of an allocate OSSL_PARAM
22  * array.
23  */
24 #define OSSL_PARAM_ALLOCATED_END    127
25
26 typedef struct {
27     const char *key;
28     int type;
29     int secure;
30     size_t size;
31     size_t alloc_blocks;
32     const BIGNUM *bn;
33     const void *string;
34     union {
35         /*
36          * These fields are never directly addressed, but their sizes are
37          * imporant so that all native types can be copied here without overrun.
38          */
39         ossl_intmax_t i;
40         ossl_uintmax_t u;
41         double d;
42     } num;
43 } OSSL_PARAM_BLD_DEF;
44
45 DEFINE_STACK_OF(OSSL_PARAM_BLD_DEF)
46
47 struct ossl_param_bld_st {
48     size_t total_blocks;
49     size_t secure_blocks;
50     STACK_OF(OSSL_PARAM_BLD_DEF) *params;
51 };
52
53 typedef union {
54     OSSL_UNION_ALIGN;
55 } OSSL_PARAM_BLD_BLOCK;
56
57 #define ALIGN_SIZE  sizeof(OSSL_PARAM_BLD_BLOCK)
58
59 static size_t bytes_to_blocks(size_t bytes)
60 {
61     return (bytes + ALIGN_SIZE - 1) / ALIGN_SIZE;
62 }
63
64 static OSSL_PARAM_BLD_DEF *param_push(OSSL_PARAM_BLD *bld, const char *key,
65                                       int size, size_t alloc, int type,
66                                       int secure)
67 {
68     OSSL_PARAM_BLD_DEF *pd = OPENSSL_zalloc(sizeof(*pd));
69
70     if (pd == NULL) {
71         CRYPTOerr(CRYPTO_F_PARAM_PUSH, ERR_R_MALLOC_FAILURE);
72         return NULL;
73     }
74     pd->key = key;
75     pd->type = type;
76     pd->size = size;
77     pd->alloc_blocks = bytes_to_blocks(size);
78     if ((pd->secure = secure) != 0)
79         bld->secure_blocks += pd->alloc_blocks;
80     else
81         bld->total_blocks += pd->alloc_blocks;
82     if (sk_OSSL_PARAM_BLD_DEF_push(bld->params, pd) <= 0) {
83         OPENSSL_free(pd);
84         pd = NULL;
85     }
86     return pd;
87 }
88
89 static int param_push_num(OSSL_PARAM_BLD *bld, const char *key,
90                           void *num, size_t size, int type)
91 {
92     OSSL_PARAM_BLD_DEF *pd = param_push(bld, key, size, size, type, 0);
93
94     if (pd == NULL)
95         return 0;
96     if (size > sizeof(pd->num)) {
97         CRYPTOerr(CRYPTO_F_PARAM_PUSH_NUM, CRYPTO_R_TOO_MANY_BYTES);
98         return 0;
99     }
100     memcpy(&pd->num, num, size);
101     return 1;
102 }
103
104 OSSL_PARAM_BLD *OSSL_PARAM_BLD_new(void)
105 {
106     OSSL_PARAM_BLD *r = OPENSSL_zalloc(sizeof(OSSL_PARAM_BLD));
107
108     if (r != NULL) {
109         r->params = sk_OSSL_PARAM_BLD_DEF_new_null();
110         if (r->params == NULL) {
111             OPENSSL_free(r);
112             r = NULL;
113         }
114     }
115     return r;
116 }
117
118 static void free_all_params(OSSL_PARAM_BLD *bld)
119 {
120     int i, n = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
121
122     for (i = 0; i < n; i++)
123         OPENSSL_free(sk_OSSL_PARAM_BLD_DEF_pop(bld->params));
124 }
125
126 void OSSL_PARAM_BLD_free(OSSL_PARAM_BLD *bld)
127 {
128     if (bld == NULL)
129         return;
130     free_all_params(bld);
131     sk_OSSL_PARAM_BLD_DEF_free(bld->params);
132     OPENSSL_free(bld);
133 }
134
135 int OSSL_PARAM_BLD_push_int(OSSL_PARAM_BLD *bld, const char *key, int num)
136 {
137     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
138 }
139
140 int OSSL_PARAM_BLD_push_uint(OSSL_PARAM_BLD *bld, const char *key,
141                              unsigned int num)
142 {
143     return param_push_num(bld, key, &num, sizeof(num),
144                           OSSL_PARAM_UNSIGNED_INTEGER);
145 }
146
147 int OSSL_PARAM_BLD_push_long(OSSL_PARAM_BLD *bld, const char *key,
148                              long int num)
149 {
150     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
151 }
152
153 int OSSL_PARAM_BLD_push_ulong(OSSL_PARAM_BLD *bld, const char *key,
154                               unsigned long int num)
155 {
156     return param_push_num(bld, key, &num, sizeof(num),
157                           OSSL_PARAM_UNSIGNED_INTEGER);
158 }
159
160 int OSSL_PARAM_BLD_push_int32(OSSL_PARAM_BLD *bld, const char *key,
161                               int32_t num)
162 {
163     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
164 }
165
166 int OSSL_PARAM_BLD_push_uint32(OSSL_PARAM_BLD *bld, const char *key,
167                                uint32_t num)
168 {
169     return param_push_num(bld, key, &num, sizeof(num),
170                           OSSL_PARAM_UNSIGNED_INTEGER);
171 }
172
173 int OSSL_PARAM_BLD_push_int64(OSSL_PARAM_BLD *bld, const char *key,
174                               int64_t num)
175 {
176     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
177 }
178
179 int OSSL_PARAM_BLD_push_uint64(OSSL_PARAM_BLD *bld, const char *key,
180                                uint64_t num)
181 {
182     return param_push_num(bld, key, &num, sizeof(num),
183                           OSSL_PARAM_UNSIGNED_INTEGER);
184 }
185
186 int OSSL_PARAM_BLD_push_size_t(OSSL_PARAM_BLD *bld, const char *key,
187                                size_t num)
188 {
189     return param_push_num(bld, key, &num, sizeof(num),
190                           OSSL_PARAM_UNSIGNED_INTEGER);
191 }
192
193 int OSSL_PARAM_BLD_push_double(OSSL_PARAM_BLD *bld, const char *key,
194                                double num)
195 {
196     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_REAL);
197 }
198
199 int OSSL_PARAM_BLD_push_BN(OSSL_PARAM_BLD *bld, const char *key,
200                            const BIGNUM *bn)
201 {
202     return OSSL_PARAM_BLD_push_BN_pad(bld, key, bn,
203                                       bn == NULL ? 0 : BN_num_bytes(bn));
204 }
205
206 int OSSL_PARAM_BLD_push_BN_pad(OSSL_PARAM_BLD *bld, const char *key,
207                                const BIGNUM *bn, size_t sz)
208 {
209     int n, secure = 0;
210     OSSL_PARAM_BLD_DEF *pd;
211
212     if (bn != NULL) {
213         n = BN_num_bytes(bn);
214         if (n < 0) {
215             CRYPTOerr(0, CRYPTO_R_ZERO_LENGTH_NUMBER);
216             return 0;
217         }
218         if (sz < (size_t)n) {
219             CRYPTOerr(0, CRYPTO_R_TOO_SMALL_BUFFER);
220             return 0;
221         }
222         if (BN_get_flags(bn, BN_FLG_SECURE) == BN_FLG_SECURE)
223             secure = 1;
224     }
225     pd = param_push(bld, key, sz, sz, OSSL_PARAM_UNSIGNED_INTEGER, secure);
226     if (pd == NULL)
227         return 0;
228     pd->bn = bn;
229     return 1;
230 }
231
232 int OSSL_PARAM_BLD_push_utf8_string(OSSL_PARAM_BLD *bld, const char *key,
233                                     const char *buf, size_t bsize)
234 {
235     OSSL_PARAM_BLD_DEF *pd;
236
237     if (bsize == 0) {
238         bsize = strlen(buf) + 1;
239     } else if (bsize > INT_MAX) {
240         CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_UTF8_STRING,
241                   CRYPTO_R_STRING_TOO_LONG);
242         return 0;
243     }
244     pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_UTF8_STRING, 0);
245     if (pd == NULL)
246         return 0;
247     pd->string = buf;
248     return 1;
249 }
250
251 int OSSL_PARAM_BLD_push_utf8_ptr(OSSL_PARAM_BLD *bld, const char *key,
252                                  char *buf, size_t bsize)
253 {
254     OSSL_PARAM_BLD_DEF *pd;
255
256     if (bsize == 0) {
257         bsize = strlen(buf) + 1;
258     } else if (bsize > INT_MAX) {
259         CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_UTF8_PTR,
260                   CRYPTO_R_STRING_TOO_LONG);
261         return 0;
262     }
263     pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_UTF8_PTR, 0);
264     if (pd == NULL)
265         return 0;
266     pd->string = buf;
267     return 1;
268 }
269
270 int OSSL_PARAM_BLD_push_octet_string(OSSL_PARAM_BLD *bld, const char *key,
271                                      const void *buf, size_t bsize)
272 {
273     OSSL_PARAM_BLD_DEF *pd;
274
275     if (bsize > INT_MAX) {
276         CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_OCTET_STRING,
277                   CRYPTO_R_STRING_TOO_LONG);
278         return 0;
279     }
280     pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_OCTET_STRING, 0);
281     if (pd == NULL)
282         return 0;
283     pd->string = buf;
284     return 1;
285 }
286
287 int OSSL_PARAM_BLD_push_octet_ptr(OSSL_PARAM_BLD *bld, const char *key,
288                                   void *buf, size_t bsize)
289 {
290     OSSL_PARAM_BLD_DEF *pd;
291
292     if (bsize > INT_MAX) {
293         CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_OCTET_PTR,
294                   CRYPTO_R_STRING_TOO_LONG);
295         return 0;
296     }
297     pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_OCTET_PTR, 0);
298     if (pd == NULL)
299         return 0;
300     pd->string = buf;
301     return 1;
302 }
303
304 static OSSL_PARAM *param_bld_convert(OSSL_PARAM_BLD *bld, OSSL_PARAM *param,
305                                      OSSL_PARAM_BLD_BLOCK *blk,
306                                      OSSL_PARAM_BLD_BLOCK *secure)
307 {
308     int i, num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
309     OSSL_PARAM_BLD_DEF *pd;
310     void *p;
311
312     for (i = 0; i < num; i++) {
313         pd = sk_OSSL_PARAM_BLD_DEF_value(bld->params, i);
314         param[i].key = pd->key;
315         param[i].data_type = pd->type;
316         param[i].data_size = pd->size;
317         param[i].return_size = OSSL_PARAM_UNMODIFIED;
318
319         if (pd->secure) {
320             p = secure;
321             secure += pd->alloc_blocks;
322         } else {
323             p = blk;
324             blk += pd->alloc_blocks;
325         }
326         param[i].data = p;
327         if (pd->bn != NULL) {
328             /* BIGNUM */
329             BN_bn2nativepad(pd->bn, (unsigned char *)p, pd->size);
330         } else if (pd->type == OSSL_PARAM_OCTET_PTR
331                    || pd->type == OSSL_PARAM_UTF8_PTR) {
332             /* PTR */
333             *(const void **)p = pd->string;
334         } else if (pd->type == OSSL_PARAM_OCTET_STRING
335                    || pd->type == OSSL_PARAM_UTF8_STRING) {
336             if (pd->string != NULL)
337                 memcpy(p, pd->string, pd->size);
338             else
339                 memset(p, 0, pd->size);
340         } else {
341             /* Number, but could also be a NULL BIGNUM */
342             if (pd->size > sizeof(pd->num))
343                 memset(p, 0, pd->size);
344             else if (pd->size > 0)
345                 memcpy(p, &pd->num, pd->size);
346         }
347     }
348     param[i] = OSSL_PARAM_construct_end();
349     return param + i;
350 }
351
352 OSSL_PARAM *OSSL_PARAM_BLD_to_param(OSSL_PARAM_BLD *bld)
353 {
354     OSSL_PARAM_BLD_BLOCK *blk, *s = NULL;
355     OSSL_PARAM *params, *last;
356     const int num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
357     const size_t p_blks = bytes_to_blocks((1 + num) * sizeof(*params));
358     const size_t total = ALIGN_SIZE * (p_blks + bld->total_blocks);
359     const size_t ss = ALIGN_SIZE * bld->secure_blocks;
360
361     if (ss > 0) {
362         s = OPENSSL_secure_malloc(ss);
363         if (s == NULL) {
364             CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_TO_PARAM,
365                       CRYPTO_R_SECURE_MALLOC_FAILURE);
366             return NULL;
367         }
368     }
369     params = OPENSSL_malloc(total);
370     if (params == NULL) {
371         CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_TO_PARAM, ERR_R_MALLOC_FAILURE);
372         OPENSSL_secure_free(s);
373         return NULL;
374     }
375     blk = p_blks + (OSSL_PARAM_BLD_BLOCK *)(params);
376     last = param_bld_convert(bld, params, blk, s);
377     last->data_size = ss;
378     last->data = s;
379     last->data_type = OSSL_PARAM_ALLOCATED_END;
380
381     /* Reset builder for reuse */
382     bld->total_blocks = 0;
383     bld->secure_blocks = 0;
384     free_all_params(bld);
385     return params;
386 }
387
388 void OSSL_PARAM_BLD_free_params(OSSL_PARAM *params)
389 {
390     if (params != NULL) {
391         OSSL_PARAM *p;
392
393         for (p = params; p->key != NULL; p++)
394             ;
395         if (p->data_type == OSSL_PARAM_ALLOCATED_END)
396             OPENSSL_secure_clear_free(p->data, p->data_size);
397         OPENSSL_free(params);
398     }
399 }