1 /*
2 * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * This is a decoder that's completely internal to the 'file:' store
12 * implementation. Only code in file_store.c know about this one. Because
13 * of this close relationship, we can cut certain corners, such as making
14 * assumptions about the "provider context", which is currently simply the
15 * provider context that the file_store.c code operates within.
16 *
17 * All this does is to read known binary encodings (currently: DER, MSBLOB,
18 * PVK) from the input if it can, and passes it on to the data callback as
19 * an object abstraction, leaving it to the callback to figure out what it
20 * actually is.
21 *
22 * This MUST be made the last decoder in a chain, leaving it to other more
23 * specialized decoders to recognise and process their stuff first.
24 */
25
26 #include <openssl/core_dispatch.h>
27 #include <openssl/core_names.h>
28 #include <openssl/core_object.h>
29 #include <openssl/bio.h>
30 #include <openssl/buffer.h>
31 #include <openssl/err.h>
32 #include <openssl/asn1err.h>
33 #include <openssl/params.h>
34 #include "internal/asn1.h"
35 #include "crypto/pem.h" /* For internal PVK and "blob" headers */
36 #include "prov/bio.h"
37 #include "file_store_local.h"
38
39 /*
40 * newctx and freectx are not strictly necessary. However, the method creator,
41 * ossl_decoder_from_algorithm(), demands that they exist, so we make sure to
42 * oblige.
43 */
44
45 static OSSL_FUNC_decoder_newctx_fn any2obj_newctx;
46 static OSSL_FUNC_decoder_freectx_fn any2obj_freectx;
47
any2obj_newctx(void * provctx)48 static void *any2obj_newctx(void *provctx)
49 {
50 return provctx;
51 }
52
any2obj_freectx(void * vctx)53 static void any2obj_freectx(void *vctx)
54 {
55 }
56
any2obj_decode_final(void * provctx,int objtype,BUF_MEM * mem,OSSL_CALLBACK * data_cb,void * data_cbarg)57 static int any2obj_decode_final(void *provctx, int objtype, BUF_MEM *mem,
58 OSSL_CALLBACK *data_cb, void *data_cbarg)
59 {
60 /*
61 * 1 indicates that we successfully decoded something, or not at all.
62 * Ending up "empty handed" is not an error.
63 */
64 int ok = 1;
65
66 if (mem != NULL) {
67 OSSL_PARAM params[3];
68
69 params[0] =
70 OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &objtype);
71 params[1] =
72 OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA,
73 mem->data, mem->length);
74 params[2] = OSSL_PARAM_construct_end();
75
76 ok = data_cb(params, data_cbarg);
77 BUF_MEM_free(mem);
78 }
79 return ok;
80 }
81
82 static OSSL_FUNC_decoder_decode_fn der2obj_decode;
der2obj_decode(void * provctx,OSSL_CORE_BIO * cin,int selection,OSSL_CALLBACK * data_cb,void * data_cbarg,OSSL_PASSPHRASE_CALLBACK * pw_cb,void * pw_cbarg)83 static int der2obj_decode(void *provctx, OSSL_CORE_BIO *cin, int selection,
84 OSSL_CALLBACK *data_cb, void *data_cbarg,
85 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
86 {
87 BIO *in = ossl_bio_new_from_core_bio(provctx, cin);
88 BUF_MEM *mem = NULL;
89 int ok;
90
91 if (in == NULL)
92 return 0;
93
94 ERR_set_mark();
95 ok = (asn1_d2i_read_bio(in, &mem) >= 0);
96 ERR_pop_to_mark();
97 if (!ok && mem != NULL) {
98 BUF_MEM_free(mem);
99 mem = NULL;
100 }
101 BIO_free(in);
102
103 /* any2obj_decode_final() frees |mem| for us */
104 return any2obj_decode_final(provctx, OSSL_OBJECT_UNKNOWN, mem,
105 data_cb, data_cbarg);
106 }
107
108 static OSSL_FUNC_decoder_decode_fn msblob2obj_decode;
msblob2obj_decode(void * provctx,OSSL_CORE_BIO * cin,int selection,OSSL_CALLBACK * data_cb,void * data_cbarg,OSSL_PASSPHRASE_CALLBACK * pw_cb,void * pw_cbarg)109 static int msblob2obj_decode(void *provctx, OSSL_CORE_BIO *cin, int selection,
110 OSSL_CALLBACK *data_cb, void *data_cbarg,
111 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
112 {
113 BIO *in = ossl_bio_new_from_core_bio(provctx, cin);
114 BUF_MEM *mem = NULL;
115 size_t mem_len = 0, mem_want;
116 const unsigned char *p;
117 unsigned int bitlen, magic;
118 int isdss = -1;
119 int ispub = -1;
120 int ok = 0;
121
122 if (in == NULL)
123 goto err;
124
125 mem_want = 16; /* The size of the MSBLOB header */
126 if ((mem = BUF_MEM_new()) == NULL
127 || !BUF_MEM_grow(mem, mem_want)) {
128 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
129 goto err;
130 }
131
132 ERR_set_mark();
133 ok = BIO_read(in, &mem->data[0], mem_want) == (int)mem_want;
134 mem_len += mem_want;
135 ERR_pop_to_mark();
136 if (!ok)
137 goto next;
138
139
140 ERR_set_mark();
141 p = (unsigned char *)&mem->data[0];
142 ok = ossl_do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) > 0;
143 ERR_pop_to_mark();
144 if (!ok)
145 goto next;
146
147 ok = 0;
148 mem_want = ossl_blob_length(bitlen, isdss, ispub);
149 if (!BUF_MEM_grow(mem, mem_len + mem_want)) {
150 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
151 goto err;
152 }
153
154 ERR_set_mark();
155 ok = BIO_read(in, &mem->data[mem_len], mem_want) == (int)mem_want;
156 mem_len += mem_want;
157 ERR_pop_to_mark();
158
159 next:
160 /* Free resources we no longer need. */
161 BIO_free(in);
162 if (!ok && mem != NULL) {
163 BUF_MEM_free(mem);
164 mem = NULL;
165 }
166
167 /* any2obj_decode_final() frees |mem| for us */
168 return any2obj_decode_final(provctx, OSSL_OBJECT_PKEY, mem,
169 data_cb, data_cbarg);
170
171 err:
172 BIO_free(in);
173 BUF_MEM_free(mem);
174 return 0;
175 }
176
177 static OSSL_FUNC_decoder_decode_fn pvk2obj_decode;
pvk2obj_decode(void * provctx,OSSL_CORE_BIO * cin,int selection,OSSL_CALLBACK * data_cb,void * data_cbarg,OSSL_PASSPHRASE_CALLBACK * pw_cb,void * pw_cbarg)178 static int pvk2obj_decode(void *provctx, OSSL_CORE_BIO *cin, int selection,
179 OSSL_CALLBACK *data_cb, void *data_cbarg,
180 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
181 {
182 BIO *in = ossl_bio_new_from_core_bio(provctx, cin);
183 BUF_MEM *mem = NULL;
184 size_t mem_len = 0, mem_want;
185 const unsigned char *p;
186 unsigned int saltlen, keylen;
187 int ok = 0;
188
189 if (in == NULL)
190 goto err;
191
192 mem_want = 24; /* The size of the PVK header */
193 if ((mem = BUF_MEM_new()) == NULL
194 || !BUF_MEM_grow(mem, mem_want)) {
195 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
196 goto err;
197 }
198
199 ERR_set_mark();
200 ok = BIO_read(in, &mem->data[0], mem_want) == (int)mem_want;
201 mem_len += mem_want;
202 ERR_pop_to_mark();
203 if (!ok)
204 goto next;
205
206
207 ERR_set_mark();
208 p = (unsigned char *)&mem->data[0];
209 ok = ossl_do_PVK_header(&p, 24, 0, &saltlen, &keylen) > 0;
210 ERR_pop_to_mark();
211 if (!ok)
212 goto next;
213
214 ok = 0;
215 mem_want = saltlen + keylen;
216 if (!BUF_MEM_grow(mem, mem_len + mem_want)) {
217 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
218 goto err;
219 }
220
221 ERR_set_mark();
222 ok = BIO_read(in, &mem->data[mem_len], mem_want) == (int)mem_want;
223 mem_len += mem_want;
224 ERR_pop_to_mark();
225
226 next:
227 /* Free resources we no longer need. */
228 BIO_free(in);
229 if (!ok && mem != NULL) {
230 BUF_MEM_free(mem);
231 mem = NULL;
232 }
233
234 /* any2obj_decode_final() frees |mem| for us */
235 return any2obj_decode_final(provctx, OSSL_OBJECT_PKEY, mem,
236 data_cb, data_cbarg);
237
238 err:
239 BIO_free(in);
240 BUF_MEM_free(mem);
241 return 0;
242 }
243
244 #define MAKE_DECODER(fromtype, objtype) \
245 static const OSSL_DISPATCH fromtype##_to_obj_decoder_functions[] = { \
246 { OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))any2obj_newctx }, \
247 { OSSL_FUNC_DECODER_FREECTX, (void (*)(void))any2obj_freectx }, \
248 { OSSL_FUNC_DECODER_DECODE, (void (*)(void))fromtype##2obj_decode }, \
249 { 0, NULL } \
250 }
251
252 MAKE_DECODER(der, OSSL_OBJECT_UNKNOWN);
253 MAKE_DECODER(msblob, OSSL_OBJECT_PKEY);
254 MAKE_DECODER(pvk, OSSL_OBJECT_PKEY);
255
256 const OSSL_ALGORITHM ossl_any_to_obj_algorithm[] = {
257 { "obj", "input=DER", der_to_obj_decoder_functions },
258 { "obj", "input=MSBLOB", msblob_to_obj_decoder_functions },
259 { "obj", "input=PVK", pvk_to_obj_decoder_functions },
260 { NULL, }
261 };
262