diff options
Diffstat (limited to 'src/libstrongswan/crypto/pkcs7.c')
| -rw-r--r-- | src/libstrongswan/crypto/pkcs7.c | 1061 |
1 files changed, 0 insertions, 1061 deletions
diff --git a/src/libstrongswan/crypto/pkcs7.c b/src/libstrongswan/crypto/pkcs7.c deleted file mode 100644 index 0ec19f2cd..000000000 --- a/src/libstrongswan/crypto/pkcs7.c +++ /dev/null @@ -1,1061 +0,0 @@ -/* - * Copyright (C) 2012 Tobias Brunner - * Copyright (C) 2002-2008 Andreas Steffen - * Copyright (C) 2005 Jan Hutter, Martin Willi - * Hochschule fuer Technik Rapperswil, Switzerland - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY - * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - */ - -#include <stdlib.h> -#include <string.h> -#include <time.h> - -#include <library.h> -#include <debug.h> - -#include <asn1/oid.h> -#include <asn1/asn1.h> -#include <asn1/asn1_parser.h> -#include <credentials/certificates/x509.h> -#include <credentials/keys/public_key.h> -#include <crypto/pkcs9.h> -#include <crypto/hashers/hasher.h> -#include <crypto/crypters/crypter.h> -#include <utils/linked_list.h> - -#include "pkcs7.h" - -typedef struct private_pkcs7_t private_pkcs7_t; - -/** - * Private data of a pkcs7_t object. - */ -struct private_pkcs7_t { - /** - * Public interface for this certificate. - */ - pkcs7_t public; - - /** - * contentInfo type - */ - int type; - - /** - * ASN.1 encoded content - */ - chunk_t content; - - /** - * ASN.1 parsing start level - */ - u_int level; - - /** - * retrieved data - */ - chunk_t data; - - /** - * ASN.1 encoded attributes - */ - pkcs9_t *attributes; - - /** - * Linked list of X.509 certificates - */ - linked_list_t *certs; -}; - -METHOD(pkcs7_t, is_data, bool, - private_pkcs7_t *this) -{ - return this->type == OID_PKCS7_DATA; -} - -METHOD(pkcs7_t, is_signedData, bool, - private_pkcs7_t *this) -{ - return this->type == OID_PKCS7_SIGNED_DATA; -} - -METHOD(pkcs7_t, is_envelopedData, bool, - private_pkcs7_t *this) -{ - return this->type == OID_PKCS7_ENVELOPED_DATA; -} - -/** - * ASN.1 definition of the PKCS#7 ContentInfo type - */ -static const asn1Object_t contentInfoObjects[] = { - { 0, "contentInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */ - { 1, "contentType", ASN1_OID, ASN1_BODY }, /* 1 */ - { 1, "content", ASN1_CONTEXT_C_0, ASN1_OPT | - ASN1_BODY }, /* 2 */ - { 1, "end opt", ASN1_EOC, ASN1_END }, /* 3 */ - { 0, "exit", ASN1_EOC, ASN1_EXIT } -}; -#define PKCS7_INFO_TYPE 1 -#define PKCS7_INFO_CONTENT 2 - -/** - * Parse PKCS#7 contentInfo object - */ -static bool parse_contentInfo(private_pkcs7_t *this) -{ - asn1_parser_t *parser; - chunk_t object; - int objectID; - bool success = FALSE; - - if (!this->data.ptr) - { - return FALSE; - } - - parser = asn1_parser_create(contentInfoObjects, this->data); - parser->set_top_level(parser, this->level); - - while (parser->iterate(parser, &objectID, &object)) - { - if (objectID == PKCS7_INFO_TYPE) - { - this->type = asn1_known_oid(object); - if (this->type < OID_PKCS7_DATA || - this->type > OID_PKCS7_ENCRYPTED_DATA) - { - DBG1(DBG_LIB, "unknown pkcs7 content type"); - goto end; - } - } - else if (objectID == PKCS7_INFO_CONTENT && object.len > 0) - { - chunk_free(&this->content); - this->content = chunk_clone(object); - } - } - success = parser->success(parser); - - if (success) - { - this->level += 2; - chunk_free(&this->data); - } - -end: - parser->destroy(parser); - return success; -} - -/** - * Check whether to abort the requested parsing - */ -static bool abort_parsing(private_pkcs7_t *this, int type) -{ - if (this->type != type) - { - DBG1(DBG_LIB, "pkcs7 content to be parsed is not of type '%s'", - oid_names[type].name); - return TRUE; - } - return FALSE; -} - -METHOD(pkcs7_t, parse_data, bool, - private_pkcs7_t *this) -{ - chunk_t data; - - if (!parse_contentInfo(this) || - abort_parsing(this, OID_PKCS7_DATA)) - { - return FALSE; - } - data = this->content; - if (data.len == 0) - { - this->data = chunk_empty; - return TRUE; - } - if (asn1_parse_simple_object(&data, ASN1_OCTET_STRING, - this->level, "data")) - { - this->data = chunk_clone(data); - return TRUE; - } - return FALSE; -} - -/** - * ASN.1 definition of the PKCS#7 signedData type - */ -static const asn1Object_t signedDataObjects[] = { - { 0, "signedData", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */ - { 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */ - { 1, "digestAlgorithms", ASN1_SET, ASN1_LOOP }, /* 2 */ - { 2, "algorithm", ASN1_EOC, ASN1_RAW }, /* 3 */ - { 1, "end loop", ASN1_EOC, ASN1_END }, /* 4 */ - { 1, "contentInfo", ASN1_EOC, ASN1_RAW }, /* 5 */ - { 1, "certificates", ASN1_CONTEXT_C_0, ASN1_OPT | - ASN1_LOOP }, /* 6 */ - { 2, "certificate", ASN1_SEQUENCE, ASN1_OBJ }, /* 7 */ - { 1, "end opt or loop", ASN1_EOC, ASN1_END }, /* 8 */ - { 1, "crls", ASN1_CONTEXT_C_1, ASN1_OPT | - ASN1_LOOP }, /* 9 */ - { 2, "crl", ASN1_SEQUENCE, ASN1_OBJ }, /* 10 */ - { 1, "end opt or loop", ASN1_EOC, ASN1_END }, /* 11 */ - { 1, "signerInfos", ASN1_SET, ASN1_LOOP }, /* 12 */ - { 2, "signerInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 13 */ - { 3, "version", ASN1_INTEGER, ASN1_BODY }, /* 14 */ - { 3, "issuerAndSerialNumber", ASN1_SEQUENCE, ASN1_BODY }, /* 15 */ - { 4, "issuer", ASN1_SEQUENCE, ASN1_OBJ }, /* 16 */ - { 4, "serial", ASN1_INTEGER, ASN1_BODY }, /* 17 */ - { 3, "digestAlgorithm", ASN1_EOC, ASN1_RAW }, /* 18 */ - { 3, "authenticatedAttributes", ASN1_CONTEXT_C_0, ASN1_OPT | - ASN1_OBJ }, /* 19 */ - { 3, "end opt", ASN1_EOC, ASN1_END }, /* 20 */ - { 3, "digestEncryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 21 */ - { 3, "encryptedDigest", ASN1_OCTET_STRING, ASN1_BODY }, /* 22 */ - { 3, "unauthenticatedAttributes", ASN1_CONTEXT_C_1, ASN1_OPT }, /* 23 */ - { 3, "end opt", ASN1_EOC, ASN1_END }, /* 24 */ - { 1, "end loop", ASN1_EOC, ASN1_END }, /* 25 */ - { 0, "exit", ASN1_EOC, ASN1_EXIT } -}; -#define PKCS7_SIGNED_VERSION 1 -#define PKCS7_DIGEST_ALG 3 -#define PKCS7_SIGNED_CONTENT_INFO 5 -#define PKCS7_SIGNED_CERT 7 -#define PKCS7_SIGNER_INFO 13 -#define PKCS7_SIGNER_INFO_VERSION 14 -#define PKCS7_SIGNED_ISSUER 16 -#define PKCS7_SIGNED_SERIAL_NUMBER 17 -#define PKCS7_DIGEST_ALGORITHM 18 -#define PKCS7_AUTH_ATTRIBUTES 19 -#define PKCS7_DIGEST_ENC_ALGORITHM 21 -#define PKCS7_ENCRYPTED_DIGEST 22 - -METHOD(pkcs7_t, parse_signedData, bool, - private_pkcs7_t *this, certificate_t *cacert) -{ - asn1_parser_t *parser; - chunk_t object; - int objectID, version; - int digest_alg = OID_UNKNOWN; - int enc_alg = OID_UNKNOWN; - int signerInfos = 0; - bool success = FALSE; - - chunk_t encrypted_digest = chunk_empty; - - if (!parse_contentInfo(this) || - abort_parsing(this, OID_PKCS7_SIGNED_DATA)) - { - return FALSE; - } - - parser = asn1_parser_create(signedDataObjects, this->content); - parser->set_top_level(parser, this->level); - - while (parser->iterate(parser, &objectID, &object)) - { - u_int level = parser->get_level(parser); - - switch (objectID) - { - case PKCS7_SIGNED_VERSION: - version = object.len ? (int)*object.ptr : 0; - DBG2(DBG_LIB, " v%d", version); - break; - case PKCS7_DIGEST_ALG: - digest_alg = asn1_parse_algorithmIdentifier(object, level, NULL); - break; - case PKCS7_SIGNED_CONTENT_INFO: - { - pkcs7_t *data = pkcs7_create_from_chunk(object, level+1); - - if (!data || !data->parse_data(data)) - { - DESTROY_IF(data); - goto end; - } - this->data = chunk_clone(data->get_data(data)); - data->destroy(data); - break; - } - case PKCS7_SIGNED_CERT: - { - certificate_t *cert; - - DBG2(DBG_LIB, " parsing pkcs7-wrapped certificate"); - cert = lib->creds->create(lib->creds, - CRED_CERTIFICATE, CERT_X509, - BUILD_BLOB_ASN1_DER, object, - BUILD_END); - if (cert) - { - this->certs->insert_last(this->certs, cert); - } - break; - } - case PKCS7_SIGNER_INFO: - signerInfos++; - DBG2(DBG_LIB, " signer #%d", signerInfos); - break; - case PKCS7_SIGNER_INFO_VERSION: - version = object.len ? (int)*object.ptr : 0; - DBG2(DBG_LIB, " v%d", version); - break; - case PKCS7_SIGNED_ISSUER: - { - identification_t *issuer; - - issuer = identification_create_from_encoding(ID_DER_ASN1_DN, object); - DBG2(DBG_LIB, " '%Y'", issuer); - issuer->destroy(issuer); - break; - } - case PKCS7_AUTH_ATTRIBUTES: - *object.ptr = ASN1_SET; - this->attributes = pkcs9_create_from_chunk(object, level+1); - *object.ptr = ASN1_CONTEXT_C_0; - break; - case PKCS7_DIGEST_ALGORITHM: - digest_alg = asn1_parse_algorithmIdentifier(object, level, NULL); - break; - case PKCS7_DIGEST_ENC_ALGORITHM: - enc_alg = asn1_parse_algorithmIdentifier(object, level, NULL); - break; - case PKCS7_ENCRYPTED_DIGEST: - encrypted_digest = object; - } - } - success = parser->success(parser); - -end: - parser->destroy(parser); - if (!success) - { - return FALSE; - } - - /* check the signature only if a cacert is available */ - if (cacert != NULL) - { - signature_scheme_t scheme; - public_key_t *key; - - scheme = signature_scheme_from_oid(digest_alg); - if (scheme == SIGN_UNKNOWN) - { - DBG1(DBG_LIB, "unsupported signature scheme"); - return FALSE; - } - if (signerInfos == 0) - { - DBG1(DBG_LIB, "no signerInfo object found"); - return FALSE; - } - else if (signerInfos > 1) - { - DBG1(DBG_LIB, "more than one signerInfo object found"); - return FALSE; - } - if (this->attributes == NULL) - { - DBG1(DBG_LIB, "no authenticatedAttributes object found"); - return FALSE; - } - if (enc_alg != OID_RSA_ENCRYPTION) - { - DBG1(DBG_LIB, "only RSA digest encryption supported"); - return FALSE; - } - - /* verify the signature */ - key = cacert->get_public_key(cacert); - if (key == NULL) - { - DBG1(DBG_LIB, "no public key found in CA certificate"); - return FALSE; - } - if (key->verify(key, scheme, - this->attributes->get_encoding(this->attributes), encrypted_digest)) - { - DBG2(DBG_LIB, "signature is valid"); - } - else - { - DBG1(DBG_LIB, "invalid signature"); - key->destroy(key); - return FALSE; - } - key->destroy(key); - - if (this->data.ptr != NULL) - { - chunk_t messageDigest; - - messageDigest = this->attributes->get_attribute(this->attributes, - OID_PKCS9_MESSAGE_DIGEST); - if (messageDigest.ptr == NULL) - { - DBG1(DBG_LIB, "messageDigest attribute not found"); - return FALSE; - } - else - { - hash_algorithm_t algorithm; - hasher_t *hasher; - chunk_t hash; - bool valid; - - algorithm = hasher_algorithm_from_oid(digest_alg); - hasher = lib->crypto->create_hasher(lib->crypto, algorithm); - if (!hasher || !hasher->allocate_hash(hasher, this->data, &hash)) - { - DESTROY_IF(hasher); - DBG1(DBG_LIB, "hash algorithm %N not supported", - hash_algorithm_names, algorithm); - return FALSE; - } - hasher->destroy(hasher); - DBG3(DBG_LIB, "hash: %B", &hash); - - valid = chunk_equals(messageDigest, hash); - free(hash.ptr); - if (valid) - { - DBG2(DBG_LIB, "messageDigest is valid"); - } - else - { - DBG1(DBG_LIB, "invalid messageDigest"); - return FALSE; - } - } - } - } - return TRUE; -} - -/** - * ASN.1 definition of the PKCS#7 envelopedData type - */ -static const asn1Object_t envelopedDataObjects[] = { - { 0, "envelopedData", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */ - { 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */ - { 1, "recipientInfos", ASN1_SET, ASN1_LOOP }, /* 2 */ - { 2, "recipientInfo", ASN1_SEQUENCE, ASN1_BODY }, /* 3 */ - { 3, "version", ASN1_INTEGER, ASN1_BODY }, /* 4 */ - { 3, "issuerAndSerialNumber", ASN1_SEQUENCE, ASN1_BODY }, /* 5 */ - { 4, "issuer", ASN1_SEQUENCE, ASN1_OBJ }, /* 6 */ - { 4, "serial", ASN1_INTEGER, ASN1_BODY }, /* 7 */ - { 3, "encryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 8 */ - { 3, "encryptedKey", ASN1_OCTET_STRING, ASN1_BODY }, /* 9 */ - { 1, "end loop", ASN1_EOC, ASN1_END }, /* 10 */ - { 1, "encryptedContentInfo", ASN1_SEQUENCE, ASN1_OBJ }, /* 11 */ - { 2, "contentType", ASN1_OID, ASN1_BODY }, /* 12 */ - { 2, "contentEncryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 13 */ - { 2, "encryptedContent", ASN1_CONTEXT_S_0, ASN1_BODY }, /* 14 */ - { 0, "exit", ASN1_EOC, ASN1_EXIT } -}; -#define PKCS7_ENVELOPED_VERSION 1 -#define PKCS7_RECIPIENT_INFO_VERSION 4 -#define PKCS7_ISSUER 6 -#define PKCS7_SERIAL_NUMBER 7 -#define PKCS7_ENCRYPTION_ALG 8 -#define PKCS7_ENCRYPTED_KEY 9 -#define PKCS7_CONTENT_TYPE 12 -#define PKCS7_CONTENT_ENC_ALGORITHM 13 -#define PKCS7_ENCRYPTED_CONTENT 14 - -METHOD(pkcs7_t, parse_envelopedData, bool, - private_pkcs7_t *this, chunk_t serialNumber, private_key_t *key) -{ - asn1_parser_t *parser; - chunk_t object; - int objectID, version; - bool success = FALSE; - - chunk_t iv = chunk_empty; - chunk_t symmetric_key = chunk_empty; - chunk_t encrypted_content = chunk_empty; - - crypter_t *crypter = NULL; - - if (!parse_contentInfo(this) || - abort_parsing(this, OID_PKCS7_ENVELOPED_DATA)) - { - return FALSE; - } - - parser = asn1_parser_create(envelopedDataObjects, this->content); - parser->set_top_level(parser, this->level); - - while (parser->iterate(parser, &objectID, &object)) - { - u_int level = parser->get_level(parser); - - switch (objectID) - { - case PKCS7_ENVELOPED_VERSION: - { - version = object.len ? (int)*object.ptr : 0; - DBG2(DBG_LIB, " v%d", version); - if (version != 0) - { - DBG1(DBG_LIB, "envelopedData version is not 0"); - goto end; - } - break; - } - case PKCS7_RECIPIENT_INFO_VERSION: - { - version = object.len ? (int)*object.ptr : 0; - DBG2(DBG_LIB, " v%d", version); - if (version != 0) - { - DBG1(DBG_LIB, "recipient info version is not 0"); - goto end; - } - break; - } - case PKCS7_ISSUER: - { - identification_t *issuer; - - issuer = identification_create_from_encoding(ID_DER_ASN1_DN, - object); - DBG2(DBG_LIB, " '%Y'", issuer); - issuer->destroy(issuer); - break; - } - case PKCS7_SERIAL_NUMBER: - { - if (!chunk_equals(serialNumber, object)) - { - DBG1(DBG_LIB, "serial numbers do not match"); - goto end; - } - break; - } - case PKCS7_ENCRYPTION_ALG: - { - int alg; - - alg = asn1_parse_algorithmIdentifier(object, level, NULL); - if (alg != OID_RSA_ENCRYPTION) - { - DBG1(DBG_LIB, "only rsa encryption supported"); - goto end; - } - break; - } - case PKCS7_ENCRYPTED_KEY: - { - if (!key->decrypt(key, ENCRYPT_RSA_PKCS1, object, &symmetric_key)) - { - DBG1(DBG_LIB, "symmetric key could not be decrypted with rsa"); - goto end; - } - DBG4(DBG_LIB, "symmetric key %B", &symmetric_key); - break; - } - case PKCS7_CONTENT_TYPE: - { - if (asn1_known_oid(object) != OID_PKCS7_DATA) - { - DBG1(DBG_LIB, "encrypted content not of type pkcs7 data"); - goto end; - } - break; - } - case PKCS7_CONTENT_ENC_ALGORITHM: - { - encryption_algorithm_t enc_alg; - size_t key_size; - int alg; - - alg = asn1_parse_algorithmIdentifier(object, level, &iv); - enc_alg = encryption_algorithm_from_oid(alg, &key_size); - if (enc_alg == ENCR_UNDEFINED) - { - DBG1(DBG_LIB, "unsupported content encryption algorithm"); - goto end; - } - crypter = lib->crypto->create_crypter(lib->crypto, enc_alg, - key_size); - if (crypter == NULL) - { - DBG1(DBG_LIB, "crypter %N not available", - encryption_algorithm_names, enc_alg); - goto end; - } - if (symmetric_key.len != crypter->get_key_size(crypter)) - { - DBG1(DBG_LIB, "symmetric key length %d is wrong", - symmetric_key.len); - goto end; - } - if (!asn1_parse_simple_object(&iv, ASN1_OCTET_STRING, - level + 1, "IV")) - { - DBG1(DBG_LIB, "IV could not be parsed"); - goto end; - } - if (iv.len != crypter->get_iv_size(crypter)) - { - DBG1(DBG_LIB, "IV length %d is wrong", iv.len); - goto end; - } - break; - } - case PKCS7_ENCRYPTED_CONTENT: - { - encrypted_content = object; - break; - } - } - } - success = parser->success(parser); - -end: - parser->destroy(parser); - if (!success) - { - goto failed; - } - success = FALSE; - - /* decrypt the content */ - if (!crypter->set_key(crypter, symmetric_key) || - !crypter->decrypt(crypter, encrypted_content, iv, &this->data)) - { - success = FALSE; - goto failed; - } - DBG4(DBG_LIB, "decrypted content with padding: %B", &this->data); - - /* remove the padding */ - { - u_char *pos = this->data.ptr + this->data.len - 1; - u_char pattern = *pos; - size_t padding = pattern; - - if (padding > this->data.len) - { - DBG1(DBG_LIB, "padding greater than data length"); - goto failed; - } - this->data.len -= padding; - - while (padding-- > 0) - { - if (*pos-- != pattern) - { - DBG1(DBG_LIB, "wrong padding pattern"); - goto failed; - } - } - } - success = TRUE; - -failed: - DESTROY_IF(crypter); - chunk_clear(&symmetric_key); - if (!success) - { - chunk_free(&this->data); - } - return success; -} - -METHOD(pkcs7_t, get_data, chunk_t, - private_pkcs7_t *this) -{ - return this->data; -} - -METHOD(pkcs7_t, get_contentInfo, chunk_t, - private_pkcs7_t *this) -{ - chunk_t content_type; - - /* create DER-encoded OID for pkcs7_contentInfo type */ - switch(this->type) - { - case OID_PKCS7_DATA: - case OID_PKCS7_SIGNED_DATA: - case OID_PKCS7_ENVELOPED_DATA: - case OID_PKCS7_SIGNED_ENVELOPED_DATA: - case OID_PKCS7_DIGESTED_DATA: - case OID_PKCS7_ENCRYPTED_DATA: - content_type = asn1_build_known_oid(this->type); - break; - case OID_UNKNOWN: - default: - DBG1(DBG_LIB, "invalid pkcs7 contentInfo type"); - return chunk_empty; - } - - return this->content.ptr == NULL - ? asn1_wrap(ASN1_SEQUENCE, "m", content_type) - : asn1_wrap(ASN1_SEQUENCE, "mm", content_type, - asn1_simple_object(ASN1_CONTEXT_C_0, this->content)); -} - -METHOD(pkcs7_t, create_certificate_enumerator, enumerator_t*, - private_pkcs7_t *this) -{ - return this->certs->create_enumerator(this->certs); -} - -METHOD(pkcs7_t, set_certificate, void, - private_pkcs7_t *this, certificate_t *cert) -{ - if (cert) - { - this->certs->insert_last(this->certs, cert); - } -} - -METHOD(pkcs7_t, set_attributes, void, - private_pkcs7_t *this, pkcs9_t *attributes) -{ - this->attributes = attributes; -} - -METHOD(pkcs7_t, get_attributes, pkcs9_t*, - private_pkcs7_t *this) -{ - return this->attributes; -} - -/** - * build a DER-encoded issuerAndSerialNumber object - */ -chunk_t pkcs7_build_issuerAndSerialNumber(certificate_t *cert) -{ - identification_t *issuer = cert->get_issuer(cert); - chunk_t serial = chunk_empty; - - if (cert->get_type(cert) == CERT_X509) - { - x509_t *x509 = (x509_t*)cert; - serial = x509->get_serial(x509); - } - - return asn1_wrap(ASN1_SEQUENCE, "cm", - issuer->get_encoding(issuer), - asn1_integer("c", serial)); -} - -METHOD(pkcs7_t, build_envelopedData, bool, - private_pkcs7_t *this, certificate_t *cert, encryption_algorithm_t alg, - size_t key_size) -{ - chunk_t iv, symmetricKey, protectedKey, in, out; - crypter_t *crypter; - int alg_oid; - - /* select OID of symmetric encryption algorithm */ - alg_oid = encryption_algorithm_to_oid(alg, key_size); - if (alg_oid == OID_UNKNOWN) - { - DBG1(DBG_LIB, " encryption algorithm %N not supported", - encryption_algorithm_names, alg); - return FALSE; - } - crypter = lib->crypto->create_crypter(lib->crypto, alg, key_size / 8); - if (crypter == NULL) - { - DBG1(DBG_LIB, " could not create crypter for algorithm %N", - encryption_algorithm_names, alg); - return FALSE; - } - - /* generate a true random symmetric encryption key - * and a pseudo-random iv - */ - { - rng_t *rng; - - rng = lib->crypto->create_rng(lib->crypto, RNG_TRUE); - if (!rng || !rng->allocate_bytes(rng, crypter->get_key_size(crypter), - &symmetricKey)) - { - DBG1(DBG_LIB, " failed to allocate symmetric encryption key"); - DESTROY_IF(rng); - return FALSE; - } - DBG4(DBG_LIB, " symmetric encryption key: %B", &symmetricKey); - rng->destroy(rng); - - rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK); - if (!rng || !rng->allocate_bytes(rng, crypter->get_iv_size(crypter), - &iv)) - { - DBG1(DBG_LIB, " failed to allocate initialization vector"); - DESTROY_IF(rng); - return FALSE; - } - DBG4(DBG_LIB, " initialization vector: %B", &iv); - rng->destroy(rng); - } - - /* pad the data so that the total length becomes - * a multiple of the block size - */ - { - size_t block_size = crypter->get_block_size(crypter); - size_t padding = block_size - this->data.len % block_size; - - in.len = this->data.len + padding; - in.ptr = malloc(in.len); - - DBG2(DBG_LIB, " padding %d bytes of data to multiple block size of %d bytes", - (int)this->data.len, (int)in.len); - - /* copy data */ - memcpy(in.ptr, this->data.ptr, this->data.len); - /* append padding */ - memset(in.ptr + this->data.len, padding, padding); - } - DBG3(DBG_LIB, " padded unencrypted data: %B", &in); - - /* symmetric encryption of data object */ - if (!crypter->set_key(crypter, symmetricKey) || - !crypter->encrypt(crypter, in, iv, &out)) - { - crypter->destroy(crypter); - chunk_clear(&in); - chunk_clear(&symmetricKey); - chunk_free(&iv); - return FALSE; - } - crypter->destroy(crypter); - chunk_clear(&in); - DBG3(DBG_LIB, " encrypted data: %B", &out); - - /* protect symmetric key by public key encryption */ - { - public_key_t *key = cert->get_public_key(cert); - - if (key == NULL) - { - DBG1(DBG_LIB, " public key not found in encryption certificate"); - chunk_clear(&symmetricKey); - chunk_free(&iv); - chunk_free(&out); - return FALSE; - } - key->encrypt(key, ENCRYPT_RSA_PKCS1, symmetricKey, &protectedKey); - key->destroy(key); - chunk_clear(&symmetricKey); - } - - /* build pkcs7 enveloped data object */ - { - chunk_t contentEncryptionAlgorithm = asn1_wrap(ASN1_SEQUENCE, "mm", - asn1_build_known_oid(alg_oid), - asn1_wrap(ASN1_OCTET_STRING, "m", iv)); - - chunk_t encryptedContentInfo = asn1_wrap(ASN1_SEQUENCE, "mmm", - asn1_build_known_oid(OID_PKCS7_DATA), - contentEncryptionAlgorithm, - asn1_wrap(ASN1_CONTEXT_S_0, "m", out)); - - chunk_t encryptedKey = asn1_wrap(ASN1_OCTET_STRING, "m", protectedKey); - - chunk_t recipientInfo = asn1_wrap(ASN1_SEQUENCE, "cmmm", - ASN1_INTEGER_0, - pkcs7_build_issuerAndSerialNumber(cert), - asn1_algorithmIdentifier(OID_RSA_ENCRYPTION), - encryptedKey); - - this->content = asn1_wrap(ASN1_SEQUENCE, "cmm", - ASN1_INTEGER_0, - asn1_wrap(ASN1_SET, "m", recipientInfo), - encryptedContentInfo); - chunk_free(&this->data); - this->type = OID_PKCS7_ENVELOPED_DATA; - this->data = get_contentInfo(this); - } - return TRUE; -} - -METHOD(pkcs7_t, build_signedData, bool, - private_pkcs7_t *this, private_key_t *private_key, hash_algorithm_t alg) -{ - chunk_t authenticatedAttributes = chunk_empty; - chunk_t encryptedDigest = chunk_empty; - chunk_t signerInfo, encoding = chunk_empty; - signature_scheme_t scheme; - int digest_oid; - certificate_t *cert; - - if (this->certs->get_first(this->certs, (void**)&cert) != SUCCESS) - { - DBG1(DBG_LIB, " no pkcs7 signer certificate found"); - return FALSE; - } - digest_oid = hasher_algorithm_to_oid(alg); - scheme = signature_scheme_from_oid(digest_oid); - - if (this->attributes != NULL) - { - if (this->data.ptr != NULL) - { - chunk_t messageDigest, signingTime, attributes; - hasher_t *hasher; - time_t now; - - hasher = lib->crypto->create_hasher(lib->crypto, alg); - if (!hasher || - !hasher->allocate_hash(hasher, this->data, &messageDigest)) - { - DESTROY_IF(hasher); - DBG1(DBG_LIB, " hash algorithm %N not support", - hash_algorithm_names, alg); - return FALSE; - } - hasher->destroy(hasher); - this->attributes->set_attribute(this->attributes, - OID_PKCS9_MESSAGE_DIGEST, - messageDigest); - free(messageDigest.ptr); - - /* take the current time as signingTime */ - now = time(NULL); - signingTime = asn1_from_time(&now, ASN1_UTCTIME); - this->attributes->set_attribute_raw(this->attributes, - OID_PKCS9_SIGNING_TIME, signingTime); - this->attributes->set_attribute_raw(this->attributes, - OID_PKCS9_CONTENT_TYPE, - asn1_build_known_oid(OID_PKCS7_DATA)); - - attributes = this->attributes->get_encoding(this->attributes); - - private_key->sign(private_key, scheme, attributes, &encryptedDigest); - authenticatedAttributes = chunk_clone(attributes); - *authenticatedAttributes.ptr = ASN1_CONTEXT_C_0; - } - } - else if (this->data.ptr != NULL) - { - private_key->sign(private_key, scheme, this->data, &encryptedDigest); - } - if (encryptedDigest.ptr) - { - encryptedDigest = asn1_wrap(ASN1_OCTET_STRING, "m", encryptedDigest); - } - signerInfo = asn1_wrap(ASN1_SEQUENCE, "cmmmmm", - ASN1_INTEGER_1, - pkcs7_build_issuerAndSerialNumber(cert), - asn1_algorithmIdentifier(digest_oid), - authenticatedAttributes, - asn1_algorithmIdentifier(OID_RSA_ENCRYPTION), - encryptedDigest); - - if (this->data.ptr != NULL) - { - chunk_free(&this->content); - this->content = asn1_simple_object(ASN1_OCTET_STRING, this->data); - chunk_free(&this->data); - } - this->type = OID_PKCS7_DATA; - this->data = get_contentInfo(this); - chunk_free(&this->content); - - cert->get_encoding(cert, CERT_ASN1_DER, &encoding); - - this->content = asn1_wrap(ASN1_SEQUENCE, "cmcmm", - ASN1_INTEGER_1, - asn1_wrap(ASN1_SET, "m", asn1_algorithmIdentifier(digest_oid)), - this->data, - asn1_wrap(ASN1_CONTEXT_C_0, "m", encoding), - asn1_wrap(ASN1_SET, "m", signerInfo)); - chunk_free(&this->data); - this->type = OID_PKCS7_SIGNED_DATA; - this->data = get_contentInfo(this); - - return TRUE; -} - -METHOD(pkcs7_t, destroy, void, - private_pkcs7_t *this) -{ - DESTROY_IF(this->attributes); - this->certs->destroy_offset(this->certs, offsetof(certificate_t, destroy)); - free(this->content.ptr); - free(this->data.ptr); - free(this); -} - -/** - * Generic private constructor - */ -static private_pkcs7_t *pkcs7_create_empty(void) -{ - private_pkcs7_t *this; - - INIT(this, - .public = { - .is_data = _is_data, - .is_signedData = _is_signedData, - .is_envelopedData = _is_envelopedData, - .parse_data = _parse_data, - .parse_signedData = _parse_signedData, - .parse_envelopedData = _parse_envelopedData, - .get_data = _get_data, - .get_contentInfo = _get_contentInfo, - .create_certificate_enumerator = _create_certificate_enumerator, - .set_certificate = _set_certificate, - .set_attributes = _set_attributes, - .get_attributes = _get_attributes, - .build_envelopedData = _build_envelopedData, - .build_signedData = _build_signedData, - .destroy = _destroy, - }, - .type = OID_UNKNOWN, - .certs = linked_list_create(), - ); - - return this; -} - -/* - * Described in header. - */ -pkcs7_t *pkcs7_create_from_chunk(chunk_t chunk, u_int level) -{ - private_pkcs7_t *this = pkcs7_create_empty(); - - this->level = level; - this->data = chunk_clone(chunk); - - return &this->public; -} - -/* - * Described in header. - */ -pkcs7_t *pkcs7_create_from_data(chunk_t data) -{ - private_pkcs7_t *this = pkcs7_create_empty(); - - this->data = chunk_clone(data); - - return &this->public; -} - |