/* crypto/cms/cms_sd.c */ /* * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project. */ /* ==================================================================== * Copyright (c) 2008 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. * ==================================================================== */ #include "cryptlib.h" #include #include #include #include #include #include #include "cms_lcl.h" #include "internal/asn1_int.h" /* CMS SignedData Utilities */ DECLARE_ASN1_ITEM(CMS_SignedData) static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms) { if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) { CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA); return NULL; } return cms->d.signedData; } static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms) { if (cms->d.other == NULL) { cms->d.signedData = M_ASN1_new_of(CMS_SignedData); if (!cms->d.signedData) { CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE); return NULL; } cms->d.signedData->version = 1; cms->d.signedData->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data); cms->d.signedData->encapContentInfo->partial = 1; ASN1_OBJECT_free(cms->contentType); cms->contentType = OBJ_nid2obj(NID_pkcs7_signed); return cms->d.signedData; } return cms_get0_signed(cms); } /* Just initialize SignedData e.g. for certs only structure */ int CMS_SignedData_init(CMS_ContentInfo *cms) { if (cms_signed_data_init(cms)) return 1; else return 0; } /* Check structures and fixup version numbers (if necessary) */ static void cms_sd_set_version(CMS_SignedData *sd) { int i; CMS_CertificateChoices *cch; CMS_RevocationInfoChoice *rch; CMS_SignerInfo *si; for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) { cch = sk_CMS_CertificateChoices_value(sd->certificates, i); if (cch->type == CMS_CERTCHOICE_OTHER) { if (sd->version < 5) sd->version = 5; } else if (cch->type == CMS_CERTCHOICE_V2ACERT) { if (sd->version < 4) sd->version = 4; } else if (cch->type == CMS_CERTCHOICE_V1ACERT) { if (sd->version < 3) sd->version = 3; } } for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) { rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i); if (rch->type == CMS_REVCHOICE_OTHER) { if (sd->version < 5) sd->version = 5; } } if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data) && (sd->version < 3)) sd->version = 3; for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) { si = sk_CMS_SignerInfo_value(sd->signerInfos, i); if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) { if (si->version < 3) si->version = 3; if (sd->version < 3) sd->version = 3; } else if (si->version < 1) si->version = 1; } if (sd->version < 1) sd->version = 1; } /* Copy an existing messageDigest value */ static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si) { STACK_OF(CMS_SignerInfo) *sinfos; CMS_SignerInfo *sitmp; int i; sinfos = CMS_get0_SignerInfos(cms); for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) { ASN1_OCTET_STRING *messageDigest; sitmp = sk_CMS_SignerInfo_value(sinfos, i); if (sitmp == si) continue; if (CMS_signed_get_attr_count(sitmp) < 0) continue; if (OBJ_cmp(si->digestAlgorithm->algorithm, sitmp->digestAlgorithm->algorithm)) continue; messageDigest = CMS_signed_get0_data_by_OBJ(sitmp, OBJ_nid2obj (NID_pkcs9_messageDigest), -3, V_ASN1_OCTET_STRING); if (!messageDigest) { CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE); return 0; } if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest, V_ASN1_OCTET_STRING, messageDigest, -1)) return 1; else return 0; } CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST); return 0; } int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type) { switch (type) { case CMS_SIGNERINFO_ISSUER_SERIAL: if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert)) return 0; break; case CMS_SIGNERINFO_KEYIDENTIFIER: if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert)) return 0; break; default: CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID); return 0; } sid->type = type; return 1; } int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid, ASN1_OCTET_STRING **keyid, X509_NAME **issuer, ASN1_INTEGER **sno) { if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) { if (issuer) *issuer = sid->d.issuerAndSerialNumber->issuer; if (sno) *sno = sid->d.issuerAndSerialNumber->serialNumber; } else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) { if (keyid) *keyid = sid->d.subjectKeyIdentifier; } else return 0; return 1; } int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert) { if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert); else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert); else return -1; } static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd) { EVP_PKEY *pkey = si->pkey; int i; if (!pkey->ameth || !pkey->ameth->pkey_ctrl) return 1; i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si); if (i == -2) { CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE); return 0; } if (i <= 0) { CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE); return 0; } return 1; } CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms, X509 *signer, EVP_PKEY *pk, const EVP_MD *md, unsigned int flags) { CMS_SignedData *sd; CMS_SignerInfo *si = NULL; X509_ALGOR *alg; int i, type; if (!X509_check_private_key(signer, pk)) { CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); return NULL; } sd = cms_signed_data_init(cms); if (!sd) goto err; si = M_ASN1_new_of(CMS_SignerInfo); if (!si) goto merr; X509_check_purpose(signer, -1, -1); CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY); CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509); si->pkey = pk; si->signer = signer; EVP_MD_CTX_init(&si->mctx); si->pctx = NULL; if (flags & CMS_USE_KEYID) { si->version = 3; if (sd->version < 3) sd->version = 3; type = CMS_SIGNERINFO_KEYIDENTIFIER; } else { type = CMS_SIGNERINFO_ISSUER_SERIAL; si->version = 1; } if (!cms_set1_SignerIdentifier(si->sid, signer, type)) goto err; if (md == NULL) { int def_nid; if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0) goto err; md = EVP_get_digestbynid(def_nid); if (md == NULL) { CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST); goto err; } } if (!md) { CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET); goto err; } X509_ALGOR_set_md(si->digestAlgorithm, md); /* See if digest is present in digestAlgorithms */ for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) { ASN1_OBJECT *aoid; alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i); X509_ALGOR_get0(&aoid, NULL, NULL, alg); if (OBJ_obj2nid(aoid) == EVP_MD_type(md)) break; } if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) { alg = X509_ALGOR_new(); if (!alg) goto merr; X509_ALGOR_set_md(alg, md); if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) { X509_ALGOR_free(alg); goto merr; } } if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0)) goto err; if (!(flags & CMS_NOATTR)) { /* * Initialialize signed attributes strutucture so other attributes * such as signing time etc are added later even if we add none here. */ if (!si->signedAttrs) { si->signedAttrs = sk_X509_ATTRIBUTE_new_null(); if (!si->signedAttrs) goto merr; } if (!(flags & CMS_NOSMIMECAP)) { STACK_OF(X509_ALGOR) *smcap = NULL; i = CMS_add_standard_smimecap(&smcap); if (i) i = CMS_add_smimecap(si, smcap); sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); if (!i) goto merr; } if (flags & CMS_REUSE_DIGEST) { if (!cms_copy_messageDigest(cms, si)) goto err; if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) && !CMS_SignerInfo_sign(si)) goto err; } } if (!(flags & CMS_NOCERTS)) { /* NB ignore -1 return for duplicate cert */ if (!CMS_add1_cert(cms, signer)) goto merr; } if (flags & CMS_KEY_PARAM) { if (flags & CMS_NOATTR) { si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL); if (!si->pctx) goto err; if (EVP_PKEY_sign_init(si->pctx) <= 0) goto err; if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0) goto err; } else if (EVP_DigestSignInit(&si->mctx, &si->pctx, md, NULL, pk) <= 0) goto err; } if (!sd->signerInfos) sd->signerInfos = sk_CMS_SignerInfo_new_null(); if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si)) goto merr; return si; merr: CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE); err: M_ASN1_free_of(si, CMS_SignerInfo); return NULL; } static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t) { ASN1_TIME *tt; int r = 0; if (t) tt = t; else tt = X509_gmtime_adj(NULL, 0); if (!tt) goto merr; if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime, tt->type, tt, -1) <= 0) goto merr; r = 1; merr: if (!t) ASN1_TIME_free(tt); if (!r) CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE); return r; } EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si) { return si->pctx; } EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si) { return &si->mctx; } STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms) { CMS_SignedData *sd; sd = cms_get0_signed(cms); if (!sd) return NULL; return sd->signerInfos; } STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms) { STACK_OF(X509) *signers = NULL; STACK_OF(CMS_SignerInfo) *sinfos; CMS_SignerInfo *si; int i; sinfos = CMS_get0_SignerInfos(cms); for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) { si = sk_CMS_SignerInfo_value(sinfos, i); if (si->signer) { if (!signers) { signers = sk_X509_new_null(); if (!signers) return NULL; } if (!sk_X509_push(signers, si->signer)) { sk_X509_free(signers); return NULL; } } } return signers; } void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer) { if (signer) { CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509); EVP_PKEY_free(si->pkey); si->pkey = X509_get_pubkey(signer); } X509_free(si->signer); si->signer = signer; } int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si, ASN1_OCTET_STRING **keyid, X509_NAME **issuer, ASN1_INTEGER **sno) { return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno); } int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert) { return cms_SignerIdentifier_cert_cmp(si->sid, cert); } int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts, unsigned int flags) { CMS_SignedData *sd; CMS_SignerInfo *si; CMS_CertificateChoices *cch; STACK_OF(CMS_CertificateChoices) *certs; X509 *x; int i, j; int ret = 0; sd = cms_get0_signed(cms); if (!sd) return -1; certs = sd->certificates; for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) { si = sk_CMS_SignerInfo_value(sd->signerInfos, i); if (si->signer) continue; for (j = 0; j < sk_X509_num(scerts); j++) { x = sk_X509_value(scerts, j); if (CMS_SignerInfo_cert_cmp(si, x) == 0) { CMS_SignerInfo_set1_signer_cert(si, x); ret++; break; } } if (si->signer || (flags & CMS_NOINTERN)) continue; for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) { cch = sk_CMS_CertificateChoices_value(certs, j); if (cch->type != 0) continue; x = cch->d.certificate; if (CMS_SignerInfo_cert_cmp(si, x) == 0) { CMS_SignerInfo_set1_signer_cert(si, x); ret++; break; } } } return ret; } void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk, X509 **signer, X509_ALGOR **pdig, X509_ALGOR **psig) { if (pk) *pk = si->pkey; if (signer) *signer = si->signer; if (pdig) *pdig = si->digestAlgorithm; if (psig) *psig = si->signatureAlgorithm; } ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si) { return si->signature; } static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms, CMS_SignerInfo *si, BIO *chain) { EVP_MD_CTX mctx; int r = 0; EVP_PKEY_CTX *pctx = NULL; EVP_MD_CTX_init(&mctx); if (!si->pkey) { CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY); return 0; } if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm)) goto err; /* Set SignerInfo algortihm details if we used custom parametsr */ if (si->pctx && !cms_sd_asn1_ctrl(si, 0)) goto err; /* * If any signed attributes calculate and add messageDigest attribute */ if (CMS_signed_get_attr_count(si) >= 0) { ASN1_OBJECT *ctype = cms->d.signedData->encapContentInfo->eContentType; unsigned char md[EVP_MAX_MD_SIZE]; unsigned int mdlen; if (!EVP_DigestFinal_ex(&mctx, md, &mdlen)) goto err; if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest, V_ASN1_OCTET_STRING, md, mdlen)) goto err; /* Copy content type across */ if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType, V_ASN1_OBJECT, ctype, -1) <= 0) goto err; if (!CMS_SignerInfo_sign(si)) goto err; } else if (si->pctx) { unsigned char *sig; size_t siglen; unsigned char md[EVP_MAX_MD_SIZE]; unsigned int mdlen; pctx = si->pctx; if (!EVP_DigestFinal_ex(&mctx, md, &mdlen)) goto err; siglen = EVP_PKEY_size(si->pkey); sig = OPENSSL_malloc(siglen); if (!sig) { CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE); goto err; } if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) { OPENSSL_free(sig); goto err; } ASN1_STRING_set0(si->signature, sig, siglen); } else { unsigned char *sig; unsigned int siglen; sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey)); if (!sig) { CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE); goto err; } if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey)) { CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_SIGNFINAL_ERROR); OPENSSL_free(sig); goto err; } ASN1_STRING_set0(si->signature, sig, siglen); } r = 1; err: EVP_MD_CTX_cleanup(&mctx); EVP_PKEY_CTX_free(pctx); return r; } int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain) { STACK_OF(CMS_SignerInfo) *sinfos; CMS_SignerInfo *si; int i; sinfos = CMS_get0_SignerInfos(cms); for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) { si = sk_CMS_SignerInfo_value(sinfos, i); if (!cms_SignerInfo_content_sign(cms, si, chain)) return 0; } cms->d.signedData->encapContentInfo->partial = 0; return 1; } int CMS_SignerInfo_sign(CMS_SignerInfo *si) { EVP_MD_CTX *mctx = &si->mctx; EVP_PKEY_CTX *pctx; unsigned char *abuf = NULL; int alen; size_t siglen; const EVP_MD *md = NULL; md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm); if (md == NULL) return 0; if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) { if (!cms_add1_signingTime(si, NULL)) goto err; } if (si->pctx) pctx = si->pctx; else { EVP_MD_CTX_init(mctx); if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0) goto err; } if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) { CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR); goto err; } alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf, ASN1_ITEM_rptr(CMS_Attributes_Sign)); if (!abuf) goto err; if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0) goto err; if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0) goto err; OPENSSL_free(abuf); abuf = OPENSSL_malloc(siglen); if (!abuf) goto err; if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0) goto err; if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) { CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR); goto err; } EVP_MD_CTX_cleanup(mctx); ASN1_STRING_set0(si->signature, abuf, siglen); return 1; err: if (abuf) OPENSSL_free(abuf); EVP_MD_CTX_cleanup(mctx); return 0; } int CMS_SignerInfo_verify(CMS_SignerInfo *si) { EVP_MD_CTX *mctx = &si->mctx; unsigned char *abuf = NULL; int alen, r = -1; const EVP_MD *md = NULL; if (!si->pkey) { CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY); return -1; } md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm); if (md == NULL) return -1; EVP_MD_CTX_init(mctx); if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0) goto err; if (!cms_sd_asn1_ctrl(si, 1)) goto err; alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf, ASN1_ITEM_rptr(CMS_Attributes_Verify)); if (!abuf) goto err; r = EVP_DigestVerifyUpdate(mctx, abuf, alen); OPENSSL_free(abuf); if (r <= 0) { r = -1; goto err; } r = EVP_DigestVerifyFinal(mctx, si->signature->data, si->signature->length); if (r <= 0) CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE); err: EVP_MD_CTX_cleanup(mctx); return r; } /* Create a chain of digest BIOs from a CMS ContentInfo */ BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms) { int i; CMS_SignedData *sd; BIO *chain = NULL; sd = cms_get0_signed(cms); if (!sd) return NULL; if (cms->d.signedData->encapContentInfo->partial) cms_sd_set_version(sd); for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) { X509_ALGOR *digestAlgorithm; BIO *mdbio; digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i); mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm); if (!mdbio) goto err; if (chain) BIO_push(chain, mdbio); else chain = mdbio; } return chain; err: BIO_free_all(chain); return NULL; } int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain) { ASN1_OCTET_STRING *os = NULL; EVP_MD_CTX mctx; EVP_PKEY_CTX *pkctx = NULL; int r = -1; unsigned char mval[EVP_MAX_MD_SIZE]; unsigned int mlen; EVP_MD_CTX_init(&mctx); /* If we have any signed attributes look for messageDigest value */ if (CMS_signed_get_attr_count(si) >= 0) { os = CMS_signed_get0_data_by_OBJ(si, OBJ_nid2obj(NID_pkcs9_messageDigest), -3, V_ASN1_OCTET_STRING); if (!os) { CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE); goto err; } } if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm)) goto err; if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0) { CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, CMS_R_UNABLE_TO_FINALIZE_CONTEXT); goto err; } /* If messageDigest found compare it */ if (os) { if (mlen != (unsigned int)os->length) { CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH); goto err; } if (memcmp(mval, os->data, mlen)) { CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, CMS_R_VERIFICATION_FAILURE); r = 0; } else r = 1; } else { const EVP_MD *md = EVP_MD_CTX_md(&mctx); pkctx = EVP_PKEY_CTX_new(si->pkey, NULL); if (EVP_PKEY_verify_init(pkctx) <= 0) goto err; if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0) goto err; si->pctx = pkctx; if (!cms_sd_asn1_ctrl(si, 1)) goto err; r = EVP_PKEY_verify(pkctx, si->signature->data, si->signature->length, mval, mlen); if (r <= 0) { CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, CMS_R_VERIFICATION_FAILURE); r = 0; } } err: EVP_PKEY_CTX_free(pkctx); EVP_MD_CTX_cleanup(&mctx); return r; } int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs) { unsigned char *smder = NULL; int smderlen, r; smderlen = i2d_X509_ALGORS(algs, &smder); if (smderlen <= 0) return 0; r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities, V_ASN1_SEQUENCE, smder, smderlen); OPENSSL_free(smder); return r; } int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs, int algnid, int keysize) { X509_ALGOR *alg; ASN1_INTEGER *key = NULL; if (keysize > 0) { key = ASN1_INTEGER_new(); if (!key || !ASN1_INTEGER_set(key, keysize)) return 0; } alg = X509_ALGOR_new(); if (!alg) { ASN1_INTEGER_free(key); return 0; } X509_ALGOR_set0(alg, OBJ_nid2obj(algnid), key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key); if (!*algs) *algs = sk_X509_ALGOR_new_null(); if (!*algs || !sk_X509_ALGOR_push(*algs, alg)) { X509_ALGOR_free(alg); return 0; } return 1; } /* Check to see if a cipher exists and if so add S/MIME capabilities */ static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg) { if (EVP_get_cipherbynid(nid)) return CMS_add_simple_smimecap(sk, nid, arg); return 1; } static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg) { if (EVP_get_digestbynid(nid)) return CMS_add_simple_smimecap(sk, nid, arg); return 1; } int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap) { if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1) || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1) || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1) || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1) || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1) || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1) || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128) || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64) || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1) || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40)) return 0; return 1; }