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osslsigncode.c
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osslsigncode.c
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/*
OpenSSL based Authenticode signing for PE/MSI/Java CAB files.
Copyright (C) 2005-2015 Per Allansson <pallansson@gmail.com>
Copyright (C) 2018-2023 Michał Trojnara <Michal.Trojnara@stunnel.org>
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 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
In addition, as a special exception, the copyright holders give
permission to link the code of portions of this program with the
OpenSSL library under certain conditions as described in each
individual source file, and distribute linked combinations
including the two.
You must obey the GNU General Public License in all respects
for all of the code used other than OpenSSL. If you modify
file(s) with this exception, you may extend this exception to your
version of the file(s), but you are not obligated to do so. If you
do not wish to do so, delete this exception statement from your
version. If you delete this exception statement from all source
files in the program, then also delete it here.
*/
/*
Implemented with good help from:
* Peter Gutmann's analysis of Authenticode:
https://www.cs.auckland.ac.nz/~pgut001/pubs/authenticode.txt
* MS CAB SDK documentation
https://docs.microsoft.com/en-us/previous-versions/ms974336(v=msdn.10)
* MS PE/COFF documentation
https://docs.microsoft.com/en-us/windows/win32/debug/pe-format
* MS Windows Authenticode PE Signature Format
http://msdn.microsoft.com/en-US/windows/hardware/gg463183
(Although the part of how the actual checksumming is done is not
how it is done inside Windows. The end result is however the same
on all "normal" PE files.)
* tail -c, tcpdump, mimencode & openssl asn1parse :)
*/
#include "osslsigncode.h"
#include "helpers.h"
/*
* $ echo -n 3006030200013000 | xxd -r -p | openssl asn1parse -i -inform der
* 0:d=0 hl=2 l= 6 cons: SEQUENCE
* 2:d=1 hl=2 l= 2 prim: BIT STRING
* 6:d=1 hl=2 l= 0 cons: SEQUENCE
*/
const u_char java_attrs_low[] = {
0x30, 0x06, 0x03, 0x02, 0x00, 0x01, 0x30, 0x00
};
/*
* $ echo -n 300c060a2b060104018237020115 | xxd -r -p | openssl asn1parse -i -inform der
* 0:d=0 hl=2 l= 12 cons: SEQUENCE
* 2:d=1 hl=2 l= 10 prim: OBJECT :Microsoft Individual Code Signing
*/
const u_char purpose_ind[] = {
0x30, 0x0c, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04,
0x01, 0x82, 0x37, 0x02, 0x01, 0x15
};
/*
* $ echo -n 300c060a2b060104018237020116 | xxd -r -p | openssl asn1parse -i -inform der
* 0:d=0 hl=2 l= 12 cons: SEQUENCE
* 2:d=1 hl=2 l= 10 prim: OBJECT :Microsoft Commercial Code Signing
*/
const u_char purpose_comm[] = {
0x30, 0x0c, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04,
0x01, 0x82, 0x37, 0x02, 0x01, 0x16
};
/*
* ASN.1 definitions (more or less from official MS Authenticode docs)
*/
ASN1_CHOICE(SpcString) = {
ASN1_IMP_OPT(SpcString, value.unicode, ASN1_BMPSTRING, 0),
ASN1_IMP_OPT(SpcString, value.ascii, ASN1_IA5STRING, 1)
} ASN1_CHOICE_END(SpcString)
IMPLEMENT_ASN1_FUNCTIONS(SpcString)
ASN1_SEQUENCE(SpcSerializedObject) = {
ASN1_SIMPLE(SpcSerializedObject, classId, ASN1_OCTET_STRING),
ASN1_SIMPLE(SpcSerializedObject, serializedData, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(SpcSerializedObject)
IMPLEMENT_ASN1_FUNCTIONS(SpcSerializedObject)
ASN1_CHOICE(SpcLink) = {
ASN1_IMP_OPT(SpcLink, value.url, ASN1_IA5STRING, 0),
ASN1_IMP_OPT(SpcLink, value.moniker, SpcSerializedObject, 1),
ASN1_EXP_OPT(SpcLink, value.file, SpcString, 2)
} ASN1_CHOICE_END(SpcLink)
IMPLEMENT_ASN1_FUNCTIONS(SpcLink)
ASN1_SEQUENCE(SpcSpOpusInfo) = {
ASN1_EXP_OPT(SpcSpOpusInfo, programName, SpcString, 0),
ASN1_EXP_OPT(SpcSpOpusInfo, moreInfo, SpcLink, 1)
} ASN1_SEQUENCE_END(SpcSpOpusInfo)
IMPLEMENT_ASN1_FUNCTIONS(SpcSpOpusInfo)
ASN1_SEQUENCE(SpcAttributeTypeAndOptionalValue) = {
ASN1_SIMPLE(SpcAttributeTypeAndOptionalValue, type, ASN1_OBJECT),
ASN1_OPT(SpcAttributeTypeAndOptionalValue, value, ASN1_ANY)
} ASN1_SEQUENCE_END(SpcAttributeTypeAndOptionalValue)
IMPLEMENT_ASN1_FUNCTIONS(SpcAttributeTypeAndOptionalValue)
ASN1_SEQUENCE(AlgorithmIdentifier) = {
ASN1_SIMPLE(AlgorithmIdentifier, algorithm, ASN1_OBJECT),
ASN1_OPT(AlgorithmIdentifier, parameters, ASN1_ANY)
} ASN1_SEQUENCE_END(AlgorithmIdentifier)
IMPLEMENT_ASN1_FUNCTIONS(AlgorithmIdentifier)
ASN1_SEQUENCE(DigestInfo) = {
ASN1_SIMPLE(DigestInfo, digestAlgorithm, AlgorithmIdentifier),
ASN1_SIMPLE(DigestInfo, digest, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(DigestInfo)
IMPLEMENT_ASN1_FUNCTIONS(DigestInfo)
ASN1_SEQUENCE(SpcIndirectDataContent) = {
ASN1_SIMPLE(SpcIndirectDataContent, data, SpcAttributeTypeAndOptionalValue),
ASN1_SIMPLE(SpcIndirectDataContent, messageDigest, DigestInfo)
} ASN1_SEQUENCE_END(SpcIndirectDataContent)
IMPLEMENT_ASN1_FUNCTIONS(SpcIndirectDataContent)
ASN1_SEQUENCE(CatalogAuthAttr) = {
ASN1_SIMPLE(CatalogAuthAttr, type, ASN1_OBJECT),
ASN1_OPT(CatalogAuthAttr, contents, ASN1_ANY)
} ASN1_SEQUENCE_END(CatalogAuthAttr)
IMPLEMENT_ASN1_FUNCTIONS(CatalogAuthAttr)
#ifdef ENABLE_CURL
/*
* Structures for Authenticode Timestamp
*/
ASN1_SEQUENCE(TimeStampRequestBlob) = {
ASN1_SIMPLE(TimeStampRequestBlob, type, ASN1_OBJECT),
ASN1_EXP_OPT(TimeStampRequestBlob, signature, ASN1_OCTET_STRING, 0)
} ASN1_SEQUENCE_END(TimeStampRequestBlob)
IMPLEMENT_ASN1_FUNCTIONS(TimeStampRequestBlob)
ASN1_SEQUENCE(TimeStampRequest) = {
ASN1_SIMPLE(TimeStampRequest, type, ASN1_OBJECT),
ASN1_SIMPLE(TimeStampRequest, blob, TimeStampRequestBlob)
} ASN1_SEQUENCE_END(TimeStampRequest)
IMPLEMENT_ASN1_FUNCTIONS(TimeStampRequest)
#endif /* ENABLE_CURL */
ASN1_SEQUENCE(CatalogInfo) = {
ASN1_SIMPLE(CatalogInfo, digest, ASN1_OCTET_STRING),
ASN1_SET_OF(CatalogInfo, attributes, CatalogAuthAttr)
} ASN1_SEQUENCE_END(CatalogInfo)
IMPLEMENT_ASN1_FUNCTIONS(CatalogInfo)
ASN1_SEQUENCE(MsCtlContent) = {
ASN1_SIMPLE(MsCtlContent, type, SpcAttributeTypeAndOptionalValue),
ASN1_SIMPLE(MsCtlContent, identifier, ASN1_OCTET_STRING),
ASN1_SIMPLE(MsCtlContent, time, ASN1_UTCTIME),
ASN1_SIMPLE(MsCtlContent, version, SpcAttributeTypeAndOptionalValue),
ASN1_SEQUENCE_OF(MsCtlContent, header_attributes, CatalogInfo),
ASN1_OPT(MsCtlContent, filename, ASN1_ANY)
} ASN1_SEQUENCE_END(MsCtlContent)
IMPLEMENT_ASN1_FUNCTIONS(MsCtlContent)
/* Prototypes */
static int signature_list_append_pkcs7(STACK_OF(PKCS7) **signatures, PKCS7 *p7, int allownest);
static time_t time_t_get_asn1_time(const ASN1_TIME *s);
static time_t time_t_get_si_time(PKCS7_SIGNER_INFO *si);
static time_t time_t_get_cms_time(CMS_ContentInfo *cms);
static CMS_ContentInfo *cms_get_timestamp(PKCS7_SIGNED *p7_signed,
PKCS7_SIGNER_INFO *countersignature);
#ifdef ENABLE_CURL
static int blob_has_nl = 0;
/*
* Callback for writing received data
*/
static size_t curl_write(void *ptr, size_t sz, size_t nmemb, void *stream)
{
size_t written, len = sz * nmemb;
if (len > 0 && !blob_has_nl) {
if (memchr(ptr, '\n', len))
blob_has_nl = 1;
}
if (!BIO_write_ex((BIO*)stream, ptr, len, &written) || written != len)
return 0; /* FAILED */
return written;
}
/*
A timestamp request looks like this:
POST <someurl> HTTP/1.1
Content-Type: application/octet-stream
Content-Length: ...
Accept: application/octet-stream
User-Agent: Transport
Host: ...
Cache-Control: no-cache
<base64encoded blob>
.. and the blob has the following ASN1 structure:
0:d=0 hl=4 l= 291 cons: SEQUENCE
4:d=1 hl=2 l= 10 prim: OBJECT :1.3.6.1.4.1.311.3.2.1
16:d=1 hl=4 l= 275 cons: SEQUENCE
20:d=2 hl=2 l= 9 prim: OBJECT :pkcs7-data
31:d=2 hl=4 l= 260 cons: cont [ 0 ]
35:d=3 hl=4 l= 256 prim: OCTET STRING
<signature>
.. and it returns a base64 encoded PKCS#7 structure.
*/
/*
* Encode RFC3161 timestamp request and write it into BIO
* [in] p7: new PKCS#7 signature
* [in] md: message digest algorithm type
* [returns] pointer to BIO with RFC3161 Timestamp Request
*/
static BIO *bio_encode_rfc3161_request(PKCS7 *p7, const EVP_MD *md)
{
STACK_OF(PKCS7_SIGNER_INFO) *signer_info;
PKCS7_SIGNER_INFO *si;
u_char mdbuf[EVP_MAX_MD_SIZE];
TS_MSG_IMPRINT *msg_imprint = NULL;
X509_ALGOR *alg = NULL;
TS_REQ *req = NULL;
BIO *bout = NULL, *bhash = NULL;
u_char *p;
int len;
signer_info = PKCS7_get_signer_info(p7);
if (!signer_info)
goto out;
si = sk_PKCS7_SIGNER_INFO_value(signer_info, 0);
if (!si)
goto out;
bhash = BIO_new(BIO_f_md());
if (!BIO_set_md(bhash, md)) {
printf("Unable to set the message digest of BIO\n");
goto out;
}
BIO_push(bhash, BIO_new(BIO_s_null()));
BIO_write(bhash, si->enc_digest->data, si->enc_digest->length);
BIO_gets(bhash, (char*)mdbuf, EVP_MD_size(md));
req = TS_REQ_new();
if (!req)
goto out;
if (!TS_REQ_set_version(req, 1))
goto out;
msg_imprint = TS_MSG_IMPRINT_new();
if (!msg_imprint)
goto out;
alg = X509_ALGOR_new();
if (!alg)
goto out;
X509_ALGOR_set_md(alg, md);
if (!X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_MD_nid(md)), V_ASN1_NULL, NULL))
goto out;
if (!TS_MSG_IMPRINT_set_algo(msg_imprint, alg))
goto out;
if (!TS_MSG_IMPRINT_set_msg(msg_imprint, mdbuf, EVP_MD_size(md)))
goto out;
if (!TS_REQ_set_msg_imprint(req, msg_imprint))
goto out;
/* TSA is expected to include its signing certificate in the response, flag 0xFF */
if (!TS_REQ_set_cert_req(req, 1))
goto out;
len = i2d_TS_REQ(req, NULL);
p = OPENSSL_malloc((size_t)len);
len = i2d_TS_REQ(req, &p);
p -= len;
bout = BIO_new(BIO_s_mem());
BIO_write(bout, p, len);
OPENSSL_free(p);
(void)BIO_flush(bout);
out:
BIO_free_all(bhash);
TS_MSG_IMPRINT_free(msg_imprint);
X509_ALGOR_free(alg);
TS_REQ_free(req);
return bout;
}
/*
* Encode authenticode timestamp request and write it into BIO
* [in] p7: new PKCS#7 signature
* [returns] pointer to BIO with authenticode Timestamp Request
*/
static BIO *bio_encode_authenticode_request(PKCS7 *p7)
{
STACK_OF(PKCS7_SIGNER_INFO) *signer_info;
PKCS7_SIGNER_INFO *si;
TimeStampRequest *req;
BIO *bout, *b64;
u_char *p;
int len;
signer_info = PKCS7_get_signer_info(p7);
if (!signer_info)
return 0; /* FAILED */
si = sk_PKCS7_SIGNER_INFO_value(signer_info, 0);
if (!si)
return 0; /* FAILED */
req = TimeStampRequest_new();
req->type = OBJ_txt2obj(SPC_TIME_STAMP_REQUEST_OBJID, 1);
req->blob->type = OBJ_nid2obj(NID_pkcs7_data);
req->blob->signature = si->enc_digest;
len = i2d_TimeStampRequest(req, NULL);
p = OPENSSL_malloc((size_t)len);
len = i2d_TimeStampRequest(req, &p);
p -= len;
req->blob->signature = NULL;
TimeStampRequest_free(req);
bout = BIO_new(BIO_s_mem());
b64 = BIO_new(BIO_f_base64());
bout = BIO_push(b64, bout);
BIO_write(bout, p, len);
OPENSSL_free(p);
(void)BIO_flush(bout);
return bout;
}
/*
* If successful the RFC 3161 timestamp will be written into
* the PKCS7 SignerInfo structure as an unauthorized attribute - cont[1].
* [in, out] p7: new PKCS#7 signature
* [in] response: RFC3161 response
* [in] verbose: additional output mode
* [returns] 1 on error or 0 on success
*/
static int attach_rfc3161_response(PKCS7 *p7, TS_RESP *response, int verbose)
{
PKCS7_SIGNER_INFO *si;
STACK_OF(X509_ATTRIBUTE) *attrs;
TS_STATUS_INFO *status;
PKCS7 *token;
u_char *p;
int i, len;
STACK_OF(PKCS7_SIGNER_INFO) *signer_info = PKCS7_get_signer_info(p7);
if (!signer_info)
return 1; /* FAILED */
si = sk_PKCS7_SIGNER_INFO_value(signer_info, 0);
if (!si)
return 1; /* FAILED */
if (!response)
return 1; /* FAILED */
status = TS_RESP_get_status_info(response);
if (ASN1_INTEGER_get(TS_STATUS_INFO_get0_status(status)) != 0) {
if (verbose) {
const STACK_OF(ASN1_UTF8STRING) *reasons = TS_STATUS_INFO_get0_text(status);
printf("Timestamping failed: status %ld\n", ASN1_INTEGER_get(TS_STATUS_INFO_get0_status(status)));
for (i = 0; i < sk_ASN1_UTF8STRING_num(reasons); i++) {
ASN1_UTF8STRING *reason = sk_ASN1_UTF8STRING_value(reasons, i);
printf("%s\n", ASN1_STRING_get0_data(reason));
}
}
return 1; /* FAILED */
}
token = TS_RESP_get_token(response);
if (((len = i2d_PKCS7(token, NULL)) <= 0) || (p = OPENSSL_malloc((size_t)len)) == NULL) {
if (verbose) {
printf("Failed to convert pkcs7: %d\n", len);
ERR_print_errors_fp(stdout);
}
return 1; /* FAILED */
}
len = i2d_PKCS7(token, &p);
p -= len;
attrs = sk_X509_ATTRIBUTE_new_null();
attrs = X509at_add1_attr_by_txt(&attrs, SPC_RFC3161_OBJID, V_ASN1_SET, p, len);
OPENSSL_free(p);
PKCS7_set_attributes(si, attrs);
sk_X509_ATTRIBUTE_pop_free(attrs, X509_ATTRIBUTE_free);
return 0; /* OK */
}
/*
* If successful the authenticode timestamp will be written into
* the PKCS7 SignerInfo structure as an unauthorized attribute - cont[1]:
* p7->d.sign->signer_info->unauth_attr
* [in, out] p7: new PKCS#7 signature
* [in] resp: PKCS#7 authenticode response
* [in] verbose: additional output mode
* [returns] 1 on error or 0 on success
*/
static int attach_authenticode_response(PKCS7 *p7, PKCS7 *resp, int verbose)
{
PKCS7_SIGNER_INFO *info, *si;
STACK_OF(X509_ATTRIBUTE) *attrs;
u_char *p;
int len, i;
STACK_OF(PKCS7_SIGNER_INFO) *signer_info;
if (!resp) {
return 1; /* FAILED */
}
for(i = sk_X509_num(resp->d.sign->cert)-1; i>=0; i--) {
PKCS7_add_certificate(p7, sk_X509_value(resp->d.sign->cert, i));
}
signer_info = PKCS7_get_signer_info(resp);
if (!signer_info) {
PKCS7_free(resp);
return 1; /* FAILED */
}
info = sk_PKCS7_SIGNER_INFO_value(signer_info, 0);
if (!info) {
PKCS7_free(resp);
return 1; /* FAILED */
}
if (((len = i2d_PKCS7_SIGNER_INFO(info, NULL)) <= 0) || (p = OPENSSL_malloc((size_t)len)) == NULL) {
if (verbose) {
printf("Failed to convert signer info: %d\n", len);
ERR_print_errors_fp(stdout);
}
PKCS7_free(resp);
return 1; /* FAILED */
}
len = i2d_PKCS7_SIGNER_INFO(info, &p);
p -= len;
PKCS7_free(resp);
attrs = sk_X509_ATTRIBUTE_new_null();
attrs = X509at_add1_attr_by_txt(&attrs, PKCS9_COUNTER_SIGNATURE, V_ASN1_SET, p, len);
OPENSSL_free(p);
signer_info = PKCS7_get_signer_info(p7);
if (!signer_info)
return 1; /* FAILED */
si = sk_PKCS7_SIGNER_INFO_value(signer_info, 0);
if (!si)
return 1; /* FAILED */
/*
* PKCS7_set_attributes() frees up all elements of si->unauth_attr
* and sets there a copy of attrs so overrides the previous timestamp
*/
PKCS7_set_attributes(si, attrs);
sk_X509_ATTRIBUTE_pop_free(attrs, X509_ATTRIBUTE_free);
return 0; /* OK */
}
/*
* Get data from HTTP server.
* [out] http_code: HTTP status
* [in] url: URL of the CRL distribution point or Time-Stamp Authority HTTP server
* [in] bout: timestamp request
* [in] proxy: proxy to getting the timestamp through
* [in] noverifypeer: do not verify the Time-Stamp Authority's SSL certificate
* [in] verbose: additional output mode
* [in] content: CRL distribution point (0), RFC3161 TSA (1), Authenticode TSA (2)
* [returns] pointer to BIO with X509 Certificate Revocation List
*/
static BIO *bio_get_http(long *http_code, char *url, BIO *bout, char *proxy,
int noverifypeer, int verbose, int content)
{
CURL *curl;
struct curl_slist *slist = NULL;
CURLcode res;
BIO *bin;
u_char *p = NULL;
long len = 0;
if (!url) {
return NULL; /* FAILED */
}
/* Start a libcurl easy session and set options for a curl easy handle */
printf("Connecting to %s\n", url);
curl = curl_easy_init();
if (proxy) {
res = curl_easy_setopt(curl, CURLOPT_PROXY, proxy);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
if (!strncmp("http:", proxy, 5)) {
res = curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
}
if (!strncmp("socks:", proxy, 6)) {
res = curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
}
}
res = curl_easy_setopt(curl, CURLOPT_URL, url);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
/*
* ask libcurl to show us the verbose output
* curl_easy_setopt(curl, CURLOPT_VERBOSE, 42);
*/
if (noverifypeer) {
res = curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
}
if (content == 1) {
/* RFC3161 Timestamp */
slist = curl_slist_append(slist, "Content-Type: application/timestamp-query");
slist = curl_slist_append(slist, "Accept: application/timestamp-reply");
} else if (content == 2) {
/* Authenticode Timestamp */
slist = curl_slist_append(slist, "Content-Type: application/octet-stream");
slist = curl_slist_append(slist, "Accept: application/octet-stream");
}
if (content > 0) {
/* Timestamp */
slist = curl_slist_append(slist, "User-Agent: Transport");
slist = curl_slist_append(slist, "Cache-Control: no-cache");
res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
len = BIO_get_mem_data(bout, &p);
res = curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, len);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
res = curl_easy_setopt(curl, CURLOPT_POSTFIELDS, (char*)p);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
res = curl_easy_setopt(curl, CURLOPT_POST, 1);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
}
bin = BIO_new(BIO_s_mem());
BIO_set_mem_eof_return(bin, 0);
res = curl_easy_setopt(curl, CURLOPT_WRITEDATA, bin);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
res = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_write);
if (res != CURLE_OK) {
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
/* Perform the request */
res = curl_easy_perform(curl);
curl_slist_free_all(slist);
if (res != CURLE_OK) {
BIO_free_all(bin);
if (verbose)
printf("CURL failure: %s %s\n", curl_easy_strerror(res), url);
curl_easy_cleanup(curl);
return NULL; /* FAILED */
} else {
/* CURLE_OK (0) */
(void)BIO_flush(bin);
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, http_code);
}
/* End a libcurl easy handle */
curl_easy_cleanup(curl);
return bin;
}
/*
* Decode a curl response from BIO and write it into the PKCS7 structure
* Add timestamp to the PKCS7 SignerInfo structure:
* sig->d.sign->signer_info->unauth_attr
* [in, out] p7: new PKCS#7 signature
* [in] ctx: structure holds input and output data
* [in] url: URL of the Time-Stamp Authority server
* [in] rfc3161: Authenticode / RFC3161 Timestamp switch
* [returns] 1 on error or 0 on success
*/
static int add_timestamp(PKCS7 *p7, FILE_FORMAT_CTX *ctx, char *url, int rfc3161)
{
BIO *bout, *bin;
int verbose = ctx->options->verbose || ctx->options->ntsurl == 1;
int res = 1;
long http_code = -1;
/* Encode timestamp request */
if (rfc3161) {
bout = bio_encode_rfc3161_request(p7, ctx->options->md);
} else {
bout = bio_encode_authenticode_request(p7);
}
if (!bout) {
return 1; /* FAILED */
}
if (rfc3161) {
bin = bio_get_http(&http_code, url, bout, ctx->options->proxy,
ctx->options->noverifypeer, verbose, 1);
} else {
bin = bio_get_http(&http_code, url, bout, ctx->options->proxy,
ctx->options->noverifypeer, verbose, 2);
}
BIO_free_all(bout);
if (bin) {
if (rfc3161) {
/* decode a RFC 3161 response from BIO */
TS_RESP *response = d2i_TS_RESP_bio(bin, NULL);
BIO_free_all(bin);
res = attach_rfc3161_response(p7, response, verbose);
TS_RESP_free(response);
} else {
/* decode an authenticode response from BIO */
PKCS7 *response;
BIO *b64, *b64_bin;
b64 = BIO_new(BIO_f_base64());
if (!blob_has_nl)
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
b64_bin = BIO_push(b64, bin);
response = d2i_PKCS7_bio(b64_bin, NULL);
BIO_free_all(b64_bin);
res = attach_authenticode_response(p7, response, verbose);
}
if (res && verbose) {
if (http_code != -1) {
printf("Failed to convert timestamp reply from %s; "
"HTTP status %ld\n", url, http_code);
} else {
printf("Failed to convert timestamp reply from %s; "
"no HTTP status available", url);
}
ERR_print_errors_fp(stdout);
}
}
return res;
}
/*
* [in, out] p7: new PKCS#7 signature
* [in] ctx: structure holds input and output data
* [returns] 0 on error or 1 on success
*/
static int add_timestamp_authenticode(PKCS7 *p7, FILE_FORMAT_CTX *ctx)
{
int i;
for (i=0; i<ctx->options->nturl; i++) {
if (!add_timestamp(p7, ctx, ctx->options->turl[i], 0))
return 1; /* OK */
}
return 0; /* FAILED */
}
/*
* [in, out] p7: new PKCS#7 signature
* [in] ctx: structure holds input and output data
* [returns] 0 on error or 1 on success
*/
static int add_timestamp_rfc3161(PKCS7 *p7, FILE_FORMAT_CTX *ctx)
{
int i;
for (i=0; i<ctx->options->ntsurl; i++) {
if (!add_timestamp(p7, ctx, ctx->options->tsurl[i], 1))
return 1; /* OK */
}
return 0; /* FAILED */
}
#endif /* ENABLE_CURL */
/*
* [in] resp_ctx: a response context that can be used for generating responses
* [in] data: unused
* [returns] hexadecimal serial number
*/
static ASN1_INTEGER *serial_cb(TS_RESP_CTX *resp_ctx, void *data)
{
int ret = 0;
uint64_t buf;
ASN1_INTEGER *serial = NULL;
/* squash unused parameter warning */
(void)data;
if (RAND_bytes((unsigned char *)&buf, sizeof buf) <= 0) {
printf("RAND_bytes failed\n");
goto out;
}
serial = ASN1_INTEGER_new();
if (!serial)
goto out;
ASN1_INTEGER_set_uint64(serial, buf);
ret = 1;
out:
if (!ret) {
TS_RESP_CTX_set_status_info(resp_ctx, TS_STATUS_REJECTION,
"Error during serial number generation.");
TS_RESP_CTX_add_failure_info(resp_ctx, TS_INFO_ADD_INFO_NOT_AVAILABLE);
ASN1_INTEGER_free(serial);
return NULL; /* FAILED */
}
return serial;
}
/*
* This must return the seconds and microseconds since Jan 1, 1970 in the sec
* and usec variables allocated by the caller.
* [in] resp_ctx: a response context that can be used for generating responses
* [in] data: timestamping time
* [out] sec: total of seconds since Jan 1, 1970
* [out] usec: microseconds (unused)
* [returns] 0 on error or 1 on success
*/
static int time_cb(TS_RESP_CTX *resp_ctx, void *data, long *sec, long *usec)
{
time_t *time = (time_t *)data;
if(!*time) {
TS_RESP_CTX_set_status_info(resp_ctx, TS_STATUS_REJECTION,
"Time is not available.");
TS_RESP_CTX_add_failure_info(resp_ctx, TS_INFO_TIME_NOT_AVAILABLE);
return 0; /* FAILED */
}
*sec = (long int)*time;
*usec = 0;
return 1; /* OK */
}
/*
* [in] ctx: structure holds input and output data
* [in] signer_cert: the signer certificate of the TSA in PEM format
* [in] signer_key: the private key of the TSA in PEM format
* [in] chain: the certificate chain that will all be included in the response
* [in] bout: timestamp request
* [returns] RFC3161 response
*/
static TS_RESP *get_rfc3161_response(FILE_FORMAT_CTX *ctx, X509 *signer_cert,
EVP_PKEY *signer_key, STACK_OF(X509) *chain, BIO *bout)
{
TS_RESP_CTX *resp_ctx = NULL;
TS_RESP *response = NULL;
ASN1_OBJECT *policy_obj = NULL;
resp_ctx = TS_RESP_CTX_new();
if (!resp_ctx)
goto out;
TS_RESP_CTX_set_serial_cb(resp_ctx, serial_cb, NULL);
if (!TS_RESP_CTX_set_signer_cert(resp_ctx, signer_cert)) {
goto out;
}
if (!TS_RESP_CTX_set_signer_key(resp_ctx, signer_key)) {
goto out;
}
if (!TS_RESP_CTX_set_certs(resp_ctx, chain)) {
goto out;
}
/* message digest algorithm that the TSA accepts */
if (!TS_RESP_CTX_add_md(resp_ctx, ctx->options->md)) {
goto out;
}
/* signing digest to use */
if (!TS_RESP_CTX_set_signer_digest(resp_ctx, ctx->options->md)) {
goto out;
}
/* default policy to use when the request does not mandate any policy
* tsa_policy1 = 1.2.3.4.1 */
policy_obj = OBJ_txt2obj(TSA_POLICY1, 0);
if (!policy_obj) {
goto out;
}
if (!TS_RESP_CTX_set_def_policy(resp_ctx, policy_obj)) {
goto out;
}
/* the accuracy of the time source of the TSA in seconds, milliseconds
* and microseconds; e.g. secs:1, millisecs:500, microsecs:100;
* 0 means not specified */
if (!TS_RESP_CTX_set_accuracy(resp_ctx, 1, 500, 100)) {
goto out;
}
if (ctx->options->tsa_time) {
TS_RESP_CTX_set_time_cb(resp_ctx, time_cb, &(ctx->options->tsa_time));
}
/* generate RFC3161 response with embedded TS_TST_INFO structure */
response = TS_RESP_create_response(resp_ctx, bout);
if (!response) {
printf("Failed to create RFC3161 response\n");
}
out:
ASN1_OBJECT_free(policy_obj);
TS_RESP_CTX_free(resp_ctx);
return response;
}
/*
* [in] bin: certfile BIO
* [in] certpass: NULL
* [returns] pointer to STACK_OF(X509) structure
*/
static STACK_OF(X509) *X509_chain_read_certs(BIO *bin, char *certpass)
{
STACK_OF(X509) *certs = sk_X509_new_null();
X509 *x509;
(void)BIO_seek(bin, 0);
x509 = PEM_read_bio_X509(bin, NULL, NULL, certpass);
while (x509) {
sk_X509_push(certs, x509);
x509 = PEM_read_bio_X509(bin, NULL, NULL, certpass);
}
ERR_clear_error();
if (!sk_X509_num(certs)) {
sk_X509_free(certs);
return NULL;
}
return certs;
}
/*
* [in, out] p7: new PKCS#7 signature
* [in] ctx: structure holds input and output data
* [returns] 1 on error or 0 on success
*/
static int add_timestamp_builtin(PKCS7 *p7, FILE_FORMAT_CTX *ctx)
{
BIO *btmp, *bout;
STACK_OF(X509) *chain;
X509 *signer_cert = NULL;
EVP_PKEY *signer_key;
TS_RESP *response = NULL;
int i, res = 1;
btmp = BIO_new_file(ctx->options->tsa_certfile, "rb");
if (!btmp) {
printf("Failed to read Time-Stamp Authority certificate file: %s\n", ctx->options->tsa_certfile);
return 0; /* FAILED */
}
/* .pem certificate file */
chain = X509_chain_read_certs(btmp, NULL);
BIO_free(btmp);
btmp = BIO_new_file(ctx->options->tsa_keyfile, "rb");
if (!btmp) {
printf("Failed to read private key file: %s\n", ctx->options->tsa_keyfile);
return 0; /* FAILED */
}
signer_key = PEM_read_bio_PrivateKey(btmp, NULL, NULL, NULL);
BIO_free(btmp);
if(!chain || !signer_key) {
printf("Failed to load Time-Stamp Authority crypto parameters\n");
return 0; /* FAILED */
}
/* find the signer's certificate located somewhere in the whole certificate chain */
for (i=0; i<sk_X509_num(chain); i++) {
X509 *cert = sk_X509_value(chain, i);
if (X509_check_private_key(cert, signer_key)) {
signer_cert = cert;
break;
}
}
if(!signer_cert) {
printf("Failed to checking the consistency of a TSA private key with a public key in any X509 certificate\n");
goto out;
}
/* The TSA signing certificate must have exactly one extended key usage
* assigned to it: timeStamping. The extended key usage must also be critical,
* otherwise the certificate is going to be refused. */
/* check X509_PURPOSE_TIMESTAMP_SIGN certificate purpose */
if (X509_check_purpose(signer_cert, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
printf("Unsupported TSA signer's certificate purpose X509_PURPOSE_TIMESTAMP_SIGN\n");
goto out;
}
/* check extended key usage flag XKU_TIMESTAMP */
if (!(X509_get_extended_key_usage(signer_cert) & XKU_TIMESTAMP)) {
printf("Unsupported Signer's certificate purpose XKU_TIMESTAMP\n");
goto out;
}
/* encode timestamp request */
bout = bio_encode_rfc3161_request(p7, ctx->options->md);
if (!bout) {
printf("Failed to encode timestamp request\n");
goto out;
}
response = get_rfc3161_response(ctx, signer_cert, signer_key, chain, bout);
BIO_free_all(bout);
if (response) {
res = attach_rfc3161_response(p7, response, ctx->options->verbose);
if (res) {
printf("Failed to convert timestamp reply\n");
ERR_print_errors_fp(stdout);
}
} else {
printf("Failed to obtain RFC3161 response\n");
}
out:
sk_X509_pop_free(chain, X509_free);
EVP_PKEY_free(signer_key);
TS_RESP_free(response);
return res;
}
/*
* If successful the unauthenticated blob will be written into
* the PKCS7 SignerInfo structure as an unauthorized attribute - cont[1]:
* p7->d.sign->signer_info->unauth_attr
* [in, out] p7: new PKCS#7 signature
* [returns] 0 on error or 1 on success
*/
static int add_unauthenticated_blob(PKCS7 *p7)
{
PKCS7_SIGNER_INFO *si;
STACK_OF(PKCS7_SIGNER_INFO) *signer_info;
ASN1_STRING *astr;
u_char *p = NULL;
int nid, len = 1024+4;
/* Length data for ASN1 attribute plus prefix */
const char prefix[] = "\x0c\x82\x04\x00---BEGIN_BLOB---";
const char postfix[] = "---END_BLOB---";
signer_info = PKCS7_get_signer_info(p7);
if (!signer_info)
return 0; /* FAILED */
si = sk_PKCS7_SIGNER_INFO_value(p7->d.sign->signer_info, 0);
if (!si)
return 0; /* FAILED */
if ((p = OPENSSL_malloc((size_t)len)) == NULL)
return 0; /* FAILED */
memset(p, 0, (size_t)len);
memcpy(p, prefix, sizeof prefix);
memcpy(p + len - sizeof postfix, postfix, sizeof postfix);
astr = ASN1_STRING_new();
ASN1_STRING_set(astr, p, len);
nid = OBJ_create(SPC_UNAUTHENTICATED_DATA_BLOB_OBJID,
"unauthenticatedData", "unauthenticatedData");
PKCS7_add_attribute(si, nid, V_ASN1_SEQUENCE, astr);
OPENSSL_free(p);
return 1; /* OK */
}
/*
* [in, out] p7: new PKCS#7 signature
* [in, out] ctx: structure holds input and output data
* [returns] 1 on error or 0 on success
*/
static int add_timestamp_and_blob(PKCS7 *p7, FILE_FORMAT_CTX *ctx)
{
#ifdef ENABLE_CURL
/* add counter-signature/timestamp */
if (ctx->options->nturl && !add_timestamp_authenticode(p7, ctx)) {