1 /*
2 * Copyright 2020-2022 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 * low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <string.h>
17
18 #include <openssl/core_dispatch.h>
19 #include <openssl/core_names.h>
20 #include <openssl/core_object.h>
21 #include <openssl/crypto.h>
22 #include <openssl/params.h>
23 #include <openssl/err.h>
24 #include <openssl/pem.h> /* For public PVK functions */
25 #include <openssl/x509.h>
26 #include "internal/passphrase.h"
27 #include "crypto/pem.h" /* For internal PVK and "blob" headers */
28 #include "crypto/rsa.h"
29 #include "prov/bio.h"
30 #include "prov/implementations.h"
31 #include "endecoder_local.h"
32
33 struct pvk2key_ctx_st; /* Forward declaration */
34 typedef int check_key_fn(void *, struct pvk2key_ctx_st *ctx);
35 typedef void adjust_key_fn(void *, struct pvk2key_ctx_st *ctx);
36 typedef void *b2i_PVK_of_bio_pw_fn(BIO *in, pem_password_cb *cb, void *u,
37 OSSL_LIB_CTX *libctx, const char *propq);
38 typedef void free_key_fn(void *);
39 struct keytype_desc_st {
40 int type; /* EVP key type */
41 const char *name; /* Keytype */
42 const OSSL_DISPATCH *fns; /* Keymgmt (to pilfer functions from) */
43
44 b2i_PVK_of_bio_pw_fn *read_private_key;
45 adjust_key_fn *adjust_key;
46 free_key_fn *free_key;
47 };
48
49 static OSSL_FUNC_decoder_freectx_fn pvk2key_freectx;
50 static OSSL_FUNC_decoder_decode_fn pvk2key_decode;
51 static OSSL_FUNC_decoder_export_object_fn pvk2key_export_object;
52
53 /*
54 * Context used for DER to key decoding.
55 */
56 struct pvk2key_ctx_st {
57 PROV_CTX *provctx;
58 const struct keytype_desc_st *desc;
59 /* The selection that is passed to der2key_decode() */
60 int selection;
61 };
62
63 static struct pvk2key_ctx_st *
pvk2key_newctx(void * provctx,const struct keytype_desc_st * desc)64 pvk2key_newctx(void *provctx, const struct keytype_desc_st *desc)
65 {
66 struct pvk2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
67
68 if (ctx != NULL) {
69 ctx->provctx = provctx;
70 ctx->desc = desc;
71 }
72 return ctx;
73 }
74
pvk2key_freectx(void * vctx)75 static void pvk2key_freectx(void *vctx)
76 {
77 struct pvk2key_ctx_st *ctx = vctx;
78
79 OPENSSL_free(ctx);
80 }
81
pvk2key_decode(void * vctx,OSSL_CORE_BIO * cin,int selection,OSSL_CALLBACK * data_cb,void * data_cbarg,OSSL_PASSPHRASE_CALLBACK * pw_cb,void * pw_cbarg)82 static int pvk2key_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
83 OSSL_CALLBACK *data_cb, void *data_cbarg,
84 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
85 {
86 struct pvk2key_ctx_st *ctx = vctx;
87 BIO *in = ossl_bio_new_from_core_bio(ctx->provctx, cin);
88 void *key = NULL;
89 int ok = 0;
90
91 if (in == NULL)
92 return 0;
93
94 ctx->selection = selection;
95
96 if ((selection == 0
97 || (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
98 && ctx->desc->read_private_key != NULL) {
99 struct ossl_passphrase_data_st pwdata;
100 int err, lib, reason;
101
102 memset(&pwdata, 0, sizeof(pwdata));
103 if (!ossl_pw_set_ossl_passphrase_cb(&pwdata, pw_cb, pw_cbarg))
104 goto end;
105
106 key = ctx->desc->read_private_key(in, ossl_pw_pvk_password, &pwdata,
107 PROV_LIBCTX_OF(ctx->provctx), NULL);
108
109 /*
110 * Because the PVK API doesn't have a separate decrypt call, we need
111 * to check the error queue for certain well known errors that are
112 * considered fatal and which we pass through, while the rest gets
113 * thrown away.
114 */
115 err = ERR_peek_last_error();
116 lib = ERR_GET_LIB(err);
117 reason = ERR_GET_REASON(err);
118 if (lib == ERR_LIB_PEM
119 && (reason == PEM_R_BAD_PASSWORD_READ
120 || reason == PEM_R_BAD_DECRYPT)) {
121 ERR_clear_last_mark();
122 goto end;
123 }
124
125 if (selection != 0 && key == NULL)
126 goto next;
127 }
128
129 if (key != NULL && ctx->desc->adjust_key != NULL)
130 ctx->desc->adjust_key(key, ctx);
131
132 next:
133 /*
134 * Indicated that we successfully decoded something, or not at all.
135 * Ending up "empty handed" is not an error.
136 */
137 ok = 1;
138
139 /*
140 * We free resources here so it's not held up during the callback, because
141 * we know the process is recursive and the allocated chunks of memory
142 * add up.
143 */
144 BIO_free(in);
145 in = NULL;
146
147 if (key != NULL) {
148 OSSL_PARAM params[4];
149 int object_type = OSSL_OBJECT_PKEY;
150
151 params[0] =
152 OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &object_type);
153 params[1] =
154 OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
155 (char *)ctx->desc->name, 0);
156 /* The address of the key becomes the octet string */
157 params[2] =
158 OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_REFERENCE,
159 &key, sizeof(key));
160 params[3] = OSSL_PARAM_construct_end();
161
162 ok = data_cb(params, data_cbarg);
163 }
164
165 end:
166 BIO_free(in);
167 ctx->desc->free_key(key);
168
169 return ok;
170 }
171
pvk2key_export_object(void * vctx,const void * reference,size_t reference_sz,OSSL_CALLBACK * export_cb,void * export_cbarg)172 static int pvk2key_export_object(void *vctx,
173 const void *reference, size_t reference_sz,
174 OSSL_CALLBACK *export_cb, void *export_cbarg)
175 {
176 struct pvk2key_ctx_st *ctx = vctx;
177 OSSL_FUNC_keymgmt_export_fn *export =
178 ossl_prov_get_keymgmt_export(ctx->desc->fns);
179 void *keydata;
180
181 if (reference_sz == sizeof(keydata) && export != NULL) {
182 /* The contents of the reference is the address to our object */
183 keydata = *(void **)reference;
184
185 return export(keydata, ctx->selection, export_cb, export_cbarg);
186 }
187 return 0;
188 }
189
190 /* ---------------------------------------------------------------------- */
191
192 #define dsa_private_key_bio (b2i_PVK_of_bio_pw_fn *)b2i_DSA_PVK_bio_ex
193 #define dsa_adjust NULL
194 #define dsa_free (void (*)(void *))DSA_free
195
196 /* ---------------------------------------------------------------------- */
197
198 #define rsa_private_key_bio (b2i_PVK_of_bio_pw_fn *)b2i_RSA_PVK_bio_ex
199
rsa_adjust(void * key,struct pvk2key_ctx_st * ctx)200 static void rsa_adjust(void *key, struct pvk2key_ctx_st *ctx)
201 {
202 ossl_rsa_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
203 }
204
205 #define rsa_free (void (*)(void *))RSA_free
206
207 /* ---------------------------------------------------------------------- */
208
209 #define IMPLEMENT_MS(KEYTYPE, keytype) \
210 static const struct keytype_desc_st \
211 pvk2##keytype##_desc = { \
212 EVP_PKEY_##KEYTYPE, #KEYTYPE, \
213 ossl_##keytype##_keymgmt_functions, \
214 keytype##_private_key_bio, \
215 keytype##_adjust, \
216 keytype##_free \
217 }; \
218 static OSSL_FUNC_decoder_newctx_fn pvk2##keytype##_newctx; \
219 static void *pvk2##keytype##_newctx(void *provctx) \
220 { \
221 return pvk2key_newctx(provctx, &pvk2##keytype##_desc); \
222 } \
223 const OSSL_DISPATCH \
224 ossl_##pvk_to_##keytype##_decoder_functions[] = { \
225 { OSSL_FUNC_DECODER_NEWCTX, \
226 (void (*)(void))pvk2##keytype##_newctx }, \
227 { OSSL_FUNC_DECODER_FREECTX, \
228 (void (*)(void))pvk2key_freectx }, \
229 { OSSL_FUNC_DECODER_DECODE, \
230 (void (*)(void))pvk2key_decode }, \
231 { OSSL_FUNC_DECODER_EXPORT_OBJECT, \
232 (void (*)(void))pvk2key_export_object }, \
233 { 0, NULL } \
234 }
235
236 #ifndef OPENSSL_NO_DSA
237 IMPLEMENT_MS(DSA, dsa);
238 #endif
239 IMPLEMENT_MS(RSA, rsa);
240