/* crypto/cms/cms_lib.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 <openssl/asn1t.h> #include <openssl/x509.h> #include <openssl/err.h> #include <openssl/pem.h> #include <openssl/bio.h> #include <openssl/asn1.h> #include "cms.h" #include "cms_lcl.h" IMPLEMENT_ASN1_FUNCTIONS(CMS_ContentInfo) IMPLEMENT_ASN1_PRINT_FUNCTION(CMS_ContentInfo) DECLARE_ASN1_ITEM(CMS_CertificateChoices) DECLARE_ASN1_ITEM(CMS_RevocationInfoChoice) DECLARE_STACK_OF(CMS_CertificateChoices) DECLARE_STACK_OF(CMS_RevocationInfoChoice) const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms) { return cms->contentType; } CMS_ContentInfo *cms_Data_create(void) { CMS_ContentInfo *cms; cms = CMS_ContentInfo_new(); if (cms) { cms->contentType = OBJ_nid2obj(NID_pkcs7_data); /* Never detached */ CMS_set_detached(cms, 0); } return cms; } BIO *cms_content_bio(CMS_ContentInfo *cms) { ASN1_OCTET_STRING **pos = CMS_get0_content(cms); if (!pos) return NULL; /* If content detached data goes nowhere: create NULL BIO */ if (!*pos) return BIO_new(BIO_s_null()); /* If content not detached and created return memory BIO */ if (!*pos || ((*pos)->flags == ASN1_STRING_FLAG_CONT)) return BIO_new(BIO_s_mem()); /* Else content was read in: return read only BIO for it */ return BIO_new_mem_buf((*pos)->data, (*pos)->length); } BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont) { BIO *cmsbio, *cont; if (icont) cont = icont; else cont = cms_content_bio(cms); if (!cont) { CMSerr(CMS_F_CMS_DATAINIT, CMS_R_NO_CONTENT); return NULL; } switch (OBJ_obj2nid(cms->contentType)) { case NID_pkcs7_data: return cont; case NID_pkcs7_signed: cmsbio = cms_SignedData_init_bio(cms); break; case NID_pkcs7_digest: cmsbio = cms_DigestedData_init_bio(cms); break; #ifdef ZLIB case NID_id_smime_ct_compressedData: cmsbio = cms_CompressedData_init_bio(cms); break; #endif case NID_pkcs7_encrypted: cmsbio = cms_EncryptedData_init_bio(cms); break; case NID_pkcs7_enveloped: cmsbio = cms_EnvelopedData_init_bio(cms); break; default: CMSerr(CMS_F_CMS_DATAINIT, CMS_R_UNSUPPORTED_TYPE); return NULL; } if (cmsbio) return BIO_push(cmsbio, cont); if (!icont) BIO_free(cont); return NULL; } int CMS_dataFinal(CMS_ContentInfo *cms, BIO *cmsbio) { ASN1_OCTET_STRING **pos = CMS_get0_content(cms); if (!pos) return 0; /* If ebmedded content find memory BIO and set content */ if (*pos && ((*pos)->flags & ASN1_STRING_FLAG_CONT)) { BIO *mbio; unsigned char *cont; long contlen; mbio = BIO_find_type(cmsbio, BIO_TYPE_MEM); if (!mbio) { CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_CONTENT_NOT_FOUND); return 0; } contlen = BIO_get_mem_data(mbio, &cont); /* Set bio as read only so its content can't be clobbered */ BIO_set_flags(mbio, BIO_FLAGS_MEM_RDONLY); BIO_set_mem_eof_return(mbio, 0); ASN1_STRING_set0(*pos, cont, contlen); (*pos)->flags &= ~ASN1_STRING_FLAG_CONT; } switch (OBJ_obj2nid(cms->contentType)) { case NID_pkcs7_data: case NID_pkcs7_enveloped: case NID_pkcs7_encrypted: case NID_id_smime_ct_compressedData: /* Nothing to do */ return 1; case NID_pkcs7_signed: return cms_SignedData_final(cms, cmsbio); case NID_pkcs7_digest: return cms_DigestedData_do_final(cms, cmsbio, 0); default: CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_UNSUPPORTED_TYPE); return 0; } } /* Return an OCTET STRING pointer to content. This allows it to * be accessed or set later. */ ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms) { switch (OBJ_obj2nid(cms->contentType)) { case NID_pkcs7_data: return &cms->d.data; case NID_pkcs7_signed: return &cms->d.signedData->encapContentInfo->eContent; case NID_pkcs7_enveloped: return &cms->d.envelopedData->encryptedContentInfo->encryptedContent; case NID_pkcs7_digest: return &cms->d.digestedData->encapContentInfo->eContent; case NID_pkcs7_encrypted: return &cms->d.encryptedData->encryptedContentInfo->encryptedContent; case NID_id_smime_ct_authData: return &cms->d.authenticatedData->encapContentInfo->eContent; case NID_id_smime_ct_compressedData: return &cms->d.compressedData->encapContentInfo->eContent; default: if (cms->d.other->type == V_ASN1_OCTET_STRING) return &cms->d.other->value.octet_string; CMSerr(CMS_F_CMS_GET0_CONTENT, CMS_R_UNSUPPORTED_CONTENT_TYPE); return NULL; } } /* Return an ASN1_OBJECT pointer to content type. This allows it to * be accessed or set later. */ static ASN1_OBJECT **cms_get0_econtent_type(CMS_ContentInfo *cms) { switch (OBJ_obj2nid(cms->contentType)) { case NID_pkcs7_signed: return &cms->d.signedData->encapContentInfo->eContentType; case NID_pkcs7_enveloped: return &cms->d.envelopedData->encryptedContentInfo->contentType; case NID_pkcs7_digest: return &cms->d.digestedData->encapContentInfo->eContentType; case NID_pkcs7_encrypted: return &cms->d.encryptedData->encryptedContentInfo->contentType; case NID_id_smime_ct_authData: return &cms->d.authenticatedData->encapContentInfo->eContentType; case NID_id_smime_ct_compressedData: return &cms->d.compressedData->encapContentInfo->eContentType; default: CMSerr(CMS_F_CMS_GET0_ECONTENT_TYPE, CMS_R_UNSUPPORTED_CONTENT_TYPE); return NULL; } } const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms) { ASN1_OBJECT **petype; petype = cms_get0_econtent_type(cms); if (petype) return *petype; return NULL; } int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid) { ASN1_OBJECT **petype, *etype; petype = cms_get0_econtent_type(cms); if (!petype) return 0; if (!oid) return 1; etype = OBJ_dup(oid); if (!etype) return 0; ASN1_OBJECT_free(*petype); *petype = etype; return 1; } int CMS_is_detached(CMS_ContentInfo *cms) { ASN1_OCTET_STRING **pos; pos = CMS_get0_content(cms); if (!pos) return -1; if (*pos) return 0; return 1; } int CMS_set_detached(CMS_ContentInfo *cms, int detached) { ASN1_OCTET_STRING **pos; pos = CMS_get0_content(cms); if (!pos) return 0; if (detached) { if (*pos) { ASN1_OCTET_STRING_free(*pos); *pos = NULL; } return 1; } if (!*pos) *pos = ASN1_OCTET_STRING_new(); if (*pos) { /* NB: special flag to show content is created and not * read in. */ (*pos)->flags |= ASN1_STRING_FLAG_CONT; return 1; } CMSerr(CMS_F_CMS_SET_DETACHED, ERR_R_MALLOC_FAILURE); return 0; } /* Set up an X509_ALGOR DigestAlgorithmIdentifier from an EVP_MD */ void cms_DigestAlgorithm_set(X509_ALGOR *alg, const EVP_MD *md) { int param_type; if (md->flags & EVP_MD_FLAG_DIGALGID_ABSENT) param_type = V_ASN1_UNDEF; else param_type = V_ASN1_NULL; X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_MD_type(md)), param_type, NULL); } /* Create a digest BIO from an X509_ALGOR structure */ BIO *cms_DigestAlgorithm_init_bio(X509_ALGOR *digestAlgorithm) { BIO *mdbio = NULL; ASN1_OBJECT *digestoid; const EVP_MD *digest; X509_ALGOR_get0(&digestoid, NULL, NULL, digestAlgorithm); digest = EVP_get_digestbyobj(digestoid); if (!digest) { CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO, CMS_R_UNKNOWN_DIGEST_ALGORIHM); goto err; } mdbio = BIO_new(BIO_f_md()); if (!mdbio || !BIO_set_md(mdbio, digest)) { CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO, CMS_R_MD_BIO_INIT_ERROR); goto err; } return mdbio; err: if (mdbio) BIO_free(mdbio); return NULL; } /* Locate a message digest content from a BIO chain based on SignerInfo */ int cms_DigestAlgorithm_find_ctx(EVP_MD_CTX *mctx, BIO *chain, X509_ALGOR *mdalg) { int nid; ASN1_OBJECT *mdoid; X509_ALGOR_get0(&mdoid, NULL, NULL, mdalg); nid = OBJ_obj2nid(mdoid); /* Look for digest type to match signature */ for (;;) { EVP_MD_CTX *mtmp; chain = BIO_find_type(chain, BIO_TYPE_MD); if (chain == NULL) { CMSerr(CMS_F_CMS_DIGESTALGORITHM_FIND_CTX, CMS_R_NO_MATCHING_DIGEST); return 0; } BIO_get_md_ctx(chain, &mtmp); if (EVP_MD_CTX_type(mtmp) == nid /* Workaround for broken implementations that use signature * algorithm OID instead of digest. */ || EVP_MD_pkey_type(EVP_MD_CTX_md(mtmp)) == nid) return EVP_MD_CTX_copy_ex(mctx, mtmp); chain = BIO_next(chain); } } static STACK_OF(CMS_CertificateChoices) **cms_get0_certificate_choices(CMS_ContentInfo *cms) { switch (OBJ_obj2nid(cms->contentType)) { case NID_pkcs7_signed: return &cms->d.signedData->certificates; case NID_pkcs7_enveloped: return &cms->d.envelopedData->originatorInfo->certificates; default: CMSerr(CMS_F_CMS_GET0_CERTIFICATE_CHOICES, CMS_R_UNSUPPORTED_CONTENT_TYPE); return NULL; } } CMS_CertificateChoices *CMS_add0_CertificateChoices(CMS_ContentInfo *cms) { STACK_OF(CMS_CertificateChoices) **pcerts; CMS_CertificateChoices *cch; pcerts = cms_get0_certificate_choices(cms); if (!pcerts) return NULL; if (!*pcerts) *pcerts = sk_CMS_CertificateChoices_new_null(); if (!*pcerts) return NULL; cch = M_ASN1_new_of(CMS_CertificateChoices); if (!cch) return NULL; if (!sk_CMS_CertificateChoices_push(*pcerts, cch)) { M_ASN1_free_of(cch, CMS_CertificateChoices); return NULL; } return cch; } int CMS_add0_cert(CMS_ContentInfo *cms, X509 *cert) { CMS_CertificateChoices *cch; STACK_OF(CMS_CertificateChoices) **pcerts; int i; pcerts = cms_get0_certificate_choices(cms); if (!pcerts) return 0; for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++) { cch = sk_CMS_CertificateChoices_value(*pcerts, i); if (cch->type == CMS_CERTCHOICE_CERT) { if (!X509_cmp(cch->d.certificate, cert)) { CMSerr(CMS_F_CMS_ADD0_CERT, CMS_R_CERTIFICATE_ALREADY_PRESENT); return 0; } } } cch = CMS_add0_CertificateChoices(cms); if (!cch) return 0; cch->type = CMS_CERTCHOICE_CERT; cch->d.certificate = cert; return 1; } int CMS_add1_cert(CMS_ContentInfo *cms, X509 *cert) { int r; r = CMS_add0_cert(cms, cert); if (r > 0) CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); return r; } static STACK_OF(CMS_RevocationInfoChoice) **cms_get0_revocation_choices(CMS_ContentInfo *cms) { switch (OBJ_obj2nid(cms->contentType)) { case NID_pkcs7_signed: return &cms->d.signedData->crls; case NID_pkcs7_enveloped: return &cms->d.envelopedData->originatorInfo->crls; default: CMSerr(CMS_F_CMS_GET0_REVOCATION_CHOICES, CMS_R_UNSUPPORTED_CONTENT_TYPE); return NULL; } } CMS_RevocationInfoChoice *CMS_add0_RevocationInfoChoice(CMS_ContentInfo *cms) { STACK_OF(CMS_RevocationInfoChoice) **pcrls; CMS_RevocationInfoChoice *rch; pcrls = cms_get0_revocation_choices(cms); if (!pcrls) return NULL; if (!*pcrls) *pcrls = sk_CMS_RevocationInfoChoice_new_null(); if (!*pcrls) return NULL; rch = M_ASN1_new_of(CMS_RevocationInfoChoice); if (!rch) return NULL; if (!sk_CMS_RevocationInfoChoice_push(*pcrls, rch)) { M_ASN1_free_of(rch, CMS_RevocationInfoChoice); return NULL; } return rch; } int CMS_add0_crl(CMS_ContentInfo *cms, X509_CRL *crl) { CMS_RevocationInfoChoice *rch; rch = CMS_add0_RevocationInfoChoice(cms); if (!rch) return 0; rch->type = CMS_REVCHOICE_CRL; rch->d.crl = crl; return 1; } int CMS_add1_crl(CMS_ContentInfo *cms, X509_CRL *crl) { int r; r = CMS_add0_crl(cms, crl); if (r > 0) CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509_CRL); return r; } STACK_OF(X509) *CMS_get1_certs(CMS_ContentInfo *cms) { STACK_OF(X509) *certs = NULL; CMS_CertificateChoices *cch; STACK_OF(CMS_CertificateChoices) **pcerts; int i; pcerts = cms_get0_certificate_choices(cms); if (!pcerts) return NULL; for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++) { cch = sk_CMS_CertificateChoices_value(*pcerts, i); if (cch->type == 0) { if (!certs) { certs = sk_X509_new_null(); if (!certs) return NULL; } if (!sk_X509_push(certs, cch->d.certificate)) { sk_X509_pop_free(certs, X509_free); return NULL; } CRYPTO_add(&cch->d.certificate->references, 1, CRYPTO_LOCK_X509); } } return certs; } STACK_OF(X509_CRL) *CMS_get1_crls(CMS_ContentInfo *cms) { STACK_OF(X509_CRL) *crls = NULL; STACK_OF(CMS_RevocationInfoChoice) **pcrls; CMS_RevocationInfoChoice *rch; int i; pcrls = cms_get0_revocation_choices(cms); if (!pcrls) return NULL; for (i = 0; i < sk_CMS_RevocationInfoChoice_num(*pcrls); i++) { rch = sk_CMS_RevocationInfoChoice_value(*pcrls, i); if (rch->type == 0) { if (!crls) { crls = sk_X509_CRL_new_null(); if (!crls) return NULL; } if (!sk_X509_CRL_push(crls, rch->d.crl)) { sk_X509_CRL_pop_free(crls, X509_CRL_free); return NULL; } CRYPTO_add(&rch->d.crl->references, 1, CRYPTO_LOCK_X509_CRL); } } return crls; }