2 * Copyright 2007-2022 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright Nokia 2007-2019
4 * Copyright Siemens AG 2015-2019
6 * Licensed under the Apache License 2.0 (the "License"). You may not use
7 * this file except in compliance with the License. You can obtain a copy
8 * in the file LICENSE in the source distribution or at
9 * https://www.openssl.org/source/license.html
12 #include "cmp_local.h"
13 #include "crypto/asn1.h"
15 /* explicit #includes not strictly needed since implied by the above: */
16 #include <openssl/asn1t.h>
17 #include <openssl/cmp.h>
18 #include <openssl/crmf.h>
19 #include <openssl/err.h>
20 #include <openssl/x509.h>
23 * This function is also used by the internal verify_PBMAC() in cmp_vfy.c.
25 * Calculate protection for given PKImessage according to
26 * the algorithm and parameters in the message header's protectionAlg
27 * using the credentials, library context, and property criteria in the ctx.
29 * returns ASN1_BIT_STRING representing the protection on success, else NULL
31 ASN1_BIT_STRING *ossl_cmp_calc_protection(const OSSL_CMP_CTX *ctx,
32 const OSSL_CMP_MSG *msg)
34 ASN1_BIT_STRING *prot = NULL;
35 OSSL_CMP_PROTECTEDPART prot_part;
36 const ASN1_OBJECT *algorOID = NULL;
37 const void *ppval = NULL;
40 if (!ossl_assert(ctx != NULL && msg != NULL))
43 /* construct data to be signed */
44 prot_part.header = msg->header;
45 prot_part.body = msg->body;
47 if (msg->header->protectionAlg == NULL) {
48 ERR_raise(ERR_LIB_CMP, CMP_R_UNKNOWN_ALGORITHM_ID);
51 X509_ALGOR_get0(&algorOID, &pptype, &ppval, msg->header->protectionAlg);
53 if (OBJ_obj2nid(algorOID) == NID_id_PasswordBasedMAC) {
55 size_t prot_part_der_len;
56 unsigned char *prot_part_der = NULL;
58 unsigned char *protection = NULL;
59 OSSL_CRMF_PBMPARAMETER *pbm = NULL;
60 ASN1_STRING *pbm_str = NULL;
61 const unsigned char *pbm_str_uc = NULL;
63 if (ctx->secretValue == NULL) {
64 ERR_raise(ERR_LIB_CMP, CMP_R_MISSING_PBM_SECRET);
68 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CALCULATING_PROTECTION);
72 len = i2d_OSSL_CMP_PROTECTEDPART(&prot_part, &prot_part_der);
73 if (len < 0 || prot_part_der == NULL) {
74 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CALCULATING_PROTECTION);
77 prot_part_der_len = (size_t)len;
79 pbm_str = (ASN1_STRING *)ppval;
80 pbm_str_uc = pbm_str->data;
81 pbm = d2i_OSSL_CRMF_PBMPARAMETER(NULL, &pbm_str_uc, pbm_str->length);
83 ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_ALGORITHM_OID);
87 if (!OSSL_CRMF_pbm_new(ctx->libctx, ctx->propq,
88 pbm, prot_part_der, prot_part_der_len,
89 ctx->secretValue->data, ctx->secretValue->length,
90 &protection, &sig_len))
93 if ((prot = ASN1_BIT_STRING_new()) == NULL)
95 /* OpenSSL defaults all bit strings to be encoded as ASN.1 NamedBitList */
96 prot->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
97 prot->flags |= ASN1_STRING_FLAG_BITS_LEFT;
98 if (!ASN1_BIT_STRING_set(prot, protection, sig_len)) {
99 ASN1_BIT_STRING_free(prot);
103 OSSL_CRMF_PBMPARAMETER_free(pbm);
104 OPENSSL_free(protection);
105 OPENSSL_free(prot_part_der);
109 const EVP_MD *md = NULL;
111 if (ctx->pkey == NULL) {
112 ERR_raise(ERR_LIB_CMP,
113 CMP_R_MISSING_KEY_INPUT_FOR_CREATING_PROTECTION);
116 if (!OBJ_find_sigid_algs(OBJ_obj2nid(algorOID), &md_nid, NULL)
117 || (md = EVP_get_digestbynid(md_nid)) == NULL) {
118 ERR_raise(ERR_LIB_CMP, CMP_R_UNKNOWN_ALGORITHM_ID);
122 if ((prot = ASN1_BIT_STRING_new()) == NULL)
124 if (ASN1_item_sign_ex(ASN1_ITEM_rptr(OSSL_CMP_PROTECTEDPART), NULL,
125 NULL, prot, &prot_part, NULL, ctx->pkey, md,
126 ctx->libctx, ctx->propq))
128 ASN1_BIT_STRING_free(prot);
133 int ossl_cmp_msg_add_extraCerts(OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg)
135 if (!ossl_assert(ctx != NULL && msg != NULL))
138 /* Add first ctx->cert and its chain if using signature-based protection */
139 if (!ctx->unprotectedSend && ctx->secretValue == NULL
140 && ctx->cert != NULL && ctx->pkey != NULL) {
141 int prepend = X509_ADD_FLAG_UP_REF | X509_ADD_FLAG_NO_DUP
142 | X509_ADD_FLAG_PREPEND | X509_ADD_FLAG_NO_SS;
144 /* if not yet done try to build chain using available untrusted certs */
145 if (ctx->chain == NULL) {
147 "trying to build chain for own CMP signer cert");
148 ctx->chain = X509_build_chain(ctx->cert, ctx->untrusted, NULL, 0,
149 ctx->libctx, ctx->propq);
150 if (ctx->chain != NULL) {
152 "success building chain for own CMP signer cert");
154 /* dump errors to avoid confusion when printing further ones */
155 OSSL_CMP_CTX_print_errors(ctx);
157 "could not build chain for own CMP signer cert");
160 if (ctx->chain != NULL) {
161 if (!ossl_x509_add_certs_new(&msg->extraCerts, ctx->chain, prepend))
164 /* make sure that at least our own signer cert is included first */
165 if (!ossl_x509_add_cert_new(&msg->extraCerts, ctx->cert, prepend))
167 ossl_cmp_debug(ctx, "fallback: adding just own CMP signer cert");
171 /* add any additional certificates from ctx->extraCertsOut */
172 if (!ossl_x509_add_certs_new(&msg->extraCerts, ctx->extraCertsOut,
173 X509_ADD_FLAG_UP_REF | X509_ADD_FLAG_NO_DUP))
176 /* in case extraCerts are empty list avoid empty ASN.1 sequence */
177 if (sk_X509_num(msg->extraCerts) == 0) {
178 sk_X509_free(msg->extraCerts);
179 msg->extraCerts = NULL;
185 * Create an X509_ALGOR structure for PasswordBasedMAC protection based on
186 * the pbm settings in the context
188 static X509_ALGOR *pbmac_algor(const OSSL_CMP_CTX *ctx)
190 OSSL_CRMF_PBMPARAMETER *pbm = NULL;
191 unsigned char *pbm_der = NULL;
193 ASN1_STRING *pbm_str = NULL;
194 X509_ALGOR *alg = NULL;
196 if (!ossl_assert(ctx != NULL))
199 pbm = OSSL_CRMF_pbmp_new(ctx->libctx, ctx->pbm_slen,
200 EVP_MD_get_type(ctx->pbm_owf), ctx->pbm_itercnt,
202 pbm_str = ASN1_STRING_new();
203 if (pbm == NULL || pbm_str == NULL)
205 if ((pbm_der_len = i2d_OSSL_CRMF_PBMPARAMETER(pbm, &pbm_der)) < 0)
207 if (!ASN1_STRING_set(pbm_str, pbm_der, pbm_der_len))
209 alg = ossl_X509_ALGOR_from_nid(NID_id_PasswordBasedMAC,
210 V_ASN1_SEQUENCE, pbm_str);
213 ASN1_STRING_free(pbm_str);
214 OPENSSL_free(pbm_der);
215 OSSL_CRMF_PBMPARAMETER_free(pbm);
219 static X509_ALGOR *sig_algor(const OSSL_CMP_CTX *ctx)
223 if (!OBJ_find_sigid_by_algs(&nid, EVP_MD_get_type(ctx->digest),
224 EVP_PKEY_get_id(ctx->pkey))) {
225 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_KEY_TYPE);
228 return ossl_X509_ALGOR_from_nid(nid, V_ASN1_UNDEF, NULL);
231 static int set_senderKID(const OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg,
232 const ASN1_OCTET_STRING *id)
235 id = ctx->referenceValue; /* standard for PBM, fallback for sig-based */
236 return id == NULL || ossl_cmp_hdr_set1_senderKID(msg->header, id);
239 int ossl_cmp_msg_protect(OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg)
241 if (!ossl_assert(ctx != NULL && msg != NULL))
245 * For the case of re-protection remove pre-existing protection.
247 X509_ALGOR_free(msg->header->protectionAlg);
248 msg->header->protectionAlg = NULL;
249 ASN1_BIT_STRING_free(msg->protection);
250 msg->protection = NULL;
252 if (ctx->unprotectedSend) {
253 if (!set_senderKID(ctx, msg, NULL))
255 } else if (ctx->secretValue != NULL) {
256 /* use PasswordBasedMac according to 5.1.3.1 if secretValue is given */
257 if ((msg->header->protectionAlg = pbmac_algor(ctx)) == NULL)
259 if (!set_senderKID(ctx, msg, NULL))
263 * will add any additional certificates from ctx->extraCertsOut
264 * while not needed to validate the protection certificate,
265 * the option to do this might be handy for certain use cases
267 } else if (ctx->cert != NULL && ctx->pkey != NULL) {
268 /* use MSG_SIG_ALG according to 5.1.3.3 if client cert and key given */
270 /* make sure that key and certificate match */
271 if (!X509_check_private_key(ctx->cert, ctx->pkey)) {
272 ERR_raise(ERR_LIB_CMP, CMP_R_CERT_AND_KEY_DO_NOT_MATCH);
276 if ((msg->header->protectionAlg = sig_algor(ctx)) == NULL)
278 /* set senderKID to keyIdentifier of the cert according to 5.1.1 */
279 if (!set_senderKID(ctx, msg, X509_get0_subject_key_id(ctx->cert)))
283 * will add ctx->cert followed, if possible, by its chain built
284 * from ctx->untrusted, and then ctx->extraCertsOut
287 ERR_raise(ERR_LIB_CMP,
288 CMP_R_MISSING_KEY_INPUT_FOR_CREATING_PROTECTION);
291 if (!ctx->unprotectedSend
292 && ((msg->protection = ossl_cmp_calc_protection(ctx, msg)) == NULL))
296 * For signature-based protection add ctx->cert followed by its chain.
297 * Finally add any additional certificates from ctx->extraCertsOut;
298 * even if not needed to validate the protection
299 * the option to do this might be handy for certain use cases.
301 if (!ossl_cmp_msg_add_extraCerts(ctx, msg))
305 * As required by RFC 4210 section 5.1.1., if the sender name is not known
306 * to the client it set to NULL-DN. In this case for identification at least
307 * the senderKID must be set, where we took the referenceValue as fallback.
309 if (!(ossl_cmp_general_name_is_NULL_DN(msg->header->sender)
310 && msg->header->senderKID == NULL))
312 ERR_raise(ERR_LIB_CMP, CMP_R_MISSING_SENDER_IDENTIFICATION);
315 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_PROTECTING_MESSAGE);