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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 <[email protected]>
Copyright (C) 2018-2023 Michał Trojnara <[email protected]>
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(SpcSipInfo) = {
ASN1_SIMPLE(SpcSipInfo, a, ASN1_INTEGER),
ASN1_SIMPLE(SpcSipInfo, string, ASN1_OCTET_STRING),
ASN1_SIMPLE(SpcSipInfo, b, ASN1_INTEGER),
ASN1_SIMPLE(SpcSipInfo, c, ASN1_INTEGER),
ASN1_SIMPLE(SpcSipInfo, d, ASN1_INTEGER),
ASN1_SIMPLE(SpcSipInfo, e, ASN1_INTEGER),
ASN1_SIMPLE(SpcSipInfo, f, ASN1_INTEGER),
} ASN1_SEQUENCE_END(SpcSipInfo)
IMPLEMENT_ASN1_FUNCTIONS(SpcSipInfo)
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)
/*
* 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)
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)
#ifndef OPENSSL_NO_ENGINE
ASN1_SEQUENCE(EngineControl) = {
ASN1_SIMPLE(EngineControl, cmd, ASN1_OCTET_STRING),
ASN1_SIMPLE(EngineControl, param, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(EngineControl)
IMPLEMENT_ASN1_FUNCTIONS(EngineControl)
#endif /* OPENSSL_NO_ENGINE */
#if OPENSSL_VERSION_NUMBER>=0x30000000L
DEFINE_STACK_OF(OSSL_PROVIDER)
static STACK_OF(OSSL_PROVIDER) *providers = NULL;
static void provider_free(OSSL_PROVIDER *prov);
static void providers_cleanup(void);
static int provider_load(const char *pname);
#endif /* OPENSSL_VERSION_NUMBER>=0x30000000L */
/* Prototypes */
static ASN1_INTEGER *create_nonce(int bits);
static char *clrdp_url_get_x509(X509 *cert);
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 ASN1_UTCTIME *asn1_time_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);
static int cursig_set_nested(PKCS7 *cursig, PKCS7 *p7);
static int nested_signatures_number_get(PKCS7 *p7);
static int X509_attribute_chain_append_object(STACK_OF(X509_ATTRIBUTE) **unauth_attr,
u_char *p, int len, const char *oid);
static STACK_OF(PKCS7) *signature_list_create(PKCS7 *p7);
static int PKCS7_compare(const PKCS7 *const *a, const PKCS7 *const *b);
static PKCS7 *pkcs7_get_sigfile(FILE_FORMAT_CTX *ctx);
static void print_cert(X509 *cert, int i);
static int x509_store_load_crlfile(X509_STORE *store, char *cafile, char *crlfile);
static void load_objects_from_store(const char *url, char *pass, EVP_PKEY **pkey, STACK_OF(X509) *certs, STACK_OF(X509_CRL) *crls);
#ifndef OPENSSL_NO_ENGINE
static void engine_control_set(GLOBAL_OPTIONS *options, const char *arg);
#endif /* OPENSSL_NO_ENGINE */
/*
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;
ASN1_INTEGER *nonce = 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)) {
fprintf(stderr, "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;
/* Setting nonce */
nonce = create_nonce(NONCE_LENGTH);
if (!nonce)
goto out;
if (!TS_REQ_set_nonce(req, nonce))
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);
ASN1_INTEGER_free(nonce);
TS_MSG_IMPRINT_free(msg_imprint);
X509_ALGOR_free(alg);
TS_REQ_free(req);
return bout;
}
static ASN1_INTEGER *create_nonce(int bits)
{
unsigned char buf[20];
ASN1_INTEGER *nonce = NULL;
int len = (bits - 1) / 8 + 1;
int i;
if (len > (int)sizeof(buf)) {
fprintf(stderr, "Invalid nonce size\n");
return NULL;
}
if (RAND_bytes(buf, len) <= 0) {
fprintf(stderr, "Random nonce generation failed\n");
return NULL;
}
/* Find the first non-zero byte and creating ASN1_INTEGER object. */
for (i = 0; i < len && !buf[i]; ++i) {
}
nonce = ASN1_INTEGER_new();
if (!nonce) {
fprintf(stderr, "Could not create nonce\n");
return NULL;
}
OPENSSL_free(nonce->data);
nonce->length = len - i;
nonce->data = OPENSSL_malloc((size_t)nonce->length + 1);
memcpy(nonce->data, buf + i, (size_t)nonce->length);
return nonce;
}
/*
* 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 unauthenticated 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;
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);
fprintf(stderr, "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);
fprintf(stderr, "%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) {
fprintf(stderr, "Failed to convert pkcs7: %d\n", len);
ERR_print_errors_fp(stderr);
}
return 1; /* FAILED */
}
len = i2d_PKCS7(token, &p);
p -= len;
if (!X509_attribute_chain_append_object(&(si->unauth_attr), p, len, SPC_RFC3161_OBJID)) {
OPENSSL_free(p);
return 1; /* FAILED */
}
OPENSSL_free(p);
return 0; /* OK */
}
/*
* If successful the authenticode timestamp will be written into
* the PKCS7 SignerInfo structure as an unauthenticated 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;
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) {
fprintf(stderr, "Failed to convert signer info: %d\n", len);
ERR_print_errors_fp(stderr);
}
PKCS7_free(resp);
return 1; /* FAILED */
}
len = i2d_PKCS7_SIGNER_INFO(info, &p);
p -= len;
PKCS7_free(resp);
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 (!X509_attribute_chain_append_object(&(si->unauth_attr), p, len, PKCS9_COUNTER_SIGNATURE)) {
OPENSSL_free(p);
return 1; /* FAILED */
}
OPENSSL_free(p);
return 0; /* OK */
}
#if defined(ENABLE_CURL) || OPENSSL_VERSION_NUMBER >= 0x30000000L
static void print_proxy(char *proxy)
{
if (proxy) {
printf ("Using configured proxy: %s\n", proxy);
} else {
char *http_proxy, *https_proxy;
http_proxy = getenv("http_proxy");
if (!http_proxy)
http_proxy = getenv("HTTP_PROXY");
if (http_proxy && *http_proxy != '\0')
printf ("Using environmental HTTP proxy: %s\n", http_proxy);
https_proxy = getenv("https_proxy");
if (!https_proxy)
https_proxy = getenv("HTTPS_PROXY");
if (https_proxy && *https_proxy != '\0')
printf ("Using environmental HTTPS proxy: %s\n", https_proxy);
}
}
#endif /* ENABLE_CURL || OPENSSL_VERSION_NUMBER < 0x30000000L */
#if OPENSSL_VERSION_NUMBER<0x30000000L
#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;
}
/*
* 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] req: 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] rfc3161: Authenticode / RFC3161 Timestamp switch
* [returns] pointer to BIO with X509 Certificate Revocation List or timestamp response
*/
static BIO *bio_get_http_curl(long *http_code, char *url, BIO *req, char *proxy,
int noverifypeer, int verbose, int rfc3161)
{
CURL *curl;
struct curl_slist *slist = NULL;
CURLcode res;
BIO *bin;
u_char *p = NULL;
long len = 0;
if (!url) {
return NULL; /* FAILED */
}
print_proxy(proxy);
/* 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) {
fprintf(stderr, "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) {
fprintf(stderr, "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) {
fprintf(stderr, "CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
}
}
res = curl_easy_setopt(curl, CURLOPT_URL, url);
if (res != CURLE_OK) {
fprintf(stderr, "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) {
fprintf(stderr, "CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
}
if (req) { /* POST */
if (rfc3161) {
/* RFC3161 Timestamp */
slist = curl_slist_append(slist, "Content-Type: application/timestamp-query");
slist = curl_slist_append(slist, "Accept: application/timestamp-reply");
} else {
/* Authenticode Timestamp */
slist = curl_slist_append(slist, "Content-Type: application/octet-stream");
slist = curl_slist_append(slist, "Accept: application/octet-stream");
}
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) {
fprintf(stderr, "CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
len = BIO_get_mem_data(req, &p);
res = curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, len);
if (res != CURLE_OK) {
fprintf(stderr, "CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
res = curl_easy_setopt(curl, CURLOPT_POSTFIELDS, (char*)p);
if (res != CURLE_OK) {
fprintf(stderr, "CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
res = curl_easy_setopt(curl, CURLOPT_POST, 1);
if (res != CURLE_OK) {
fprintf(stderr, "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) {
fprintf(stderr, "CURL failure: %s %s\n", curl_easy_strerror(res), url);
}
res = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_write);
if (res != CURLE_OK) {
fprintf(stderr, "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)
fprintf(stderr, "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);
if (req && !rfc3161) {
/* BASE64 encoded Authenticode Timestamp */
BIO *b64 = BIO_new(BIO_f_base64());
if (!blob_has_nl)
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
bin = BIO_push(b64, bin);
}
return bin;
}
#endif /* ENABLE_CURL */
#else /* OPENSSL_VERSION_NUMBER<0x30000000L */
/* HTTP callback function that supports TLS connection also via HTTPS proxy */
static BIO *http_tls_cb(BIO *bio, void *arg, int connect, int detail)
{
HTTP_TLS_Info *info = (HTTP_TLS_Info *)arg;
SSL_CTX *ssl_ctx = info->ssl_ctx;
if (ssl_ctx == NULL) {
/* not using TLS */
return bio;
}
if (connect && detail) {
/* connecting with TLS */
SSL *ssl;
BIO *sbio = NULL;
if (info->use_proxy && !OSSL_HTTP_proxy_connect(bio, info->server,
info->port, NULL, NULL, info->timeout, NULL, NULL)) {
return NULL;
}
sbio = BIO_new(BIO_f_ssl());
if (sbio == NULL) {
return NULL;
}
ssl = SSL_new(ssl_ctx);
if (ssl == NULL) {
BIO_free(sbio);
return NULL;
}
SSL_set_tlsext_host_name(ssl, info->server);
SSL_set_connect_state(ssl);
BIO_set_ssl(sbio, ssl, BIO_CLOSE);
bio = BIO_push(sbio, bio);
}
return bio;
}
static int verify_callback(int ok, X509_STORE_CTX *ctx)
{
if (!ok) {
int error = X509_STORE_CTX_get_error(ctx);
print_cert(X509_STORE_CTX_get_current_cert(ctx), 0);
if (error == X509_V_ERR_UNABLE_TO_GET_CRL) {
char *url = clrdp_url_get_x509(X509_STORE_CTX_get_current_cert(ctx));
printf("\tWarning: Ignoring \'%s\' error for CRL validation\n",
X509_verify_cert_error_string(error));
printf("\nUse the \"-HTTPS-CRLfile\" option to verify CRL\n");
if (url) {
printf("HTTPS's CRL distribution point: %s\n", url);
OPENSSL_free(url);
}
return 1;
} else {
printf("\tError: %s\n\n", X509_verify_cert_error_string(error));
}
}
return ok;
}
/*
* Read data from socket BIO
* [in] s_bio: socket BIO
* [in] rctx: open connection context
* [in] use_ssl: HTTPS request switch
* [returns] memory BIO
*/
static BIO *socket_bio_read(BIO *s_bio, OSSL_HTTP_REQ_CTX *rctx, int use_ssl)
{
int retry = 1, ok = 0, written = 0, resp_len = 0;
char *buf = OPENSSL_malloc(OSSL_HTTP_DEFAULT_MAX_RESP_LEN);
BIO *resp = BIO_new(BIO_s_mem());
if (rctx) {
resp_len = (int)OSSL_HTTP_REQ_CTX_get_resp_len(rctx);
}
if (resp_len == 0) {
if (use_ssl)
BIO_ssl_shutdown(s_bio);
else {
int fd = (int)BIO_get_fd(s_bio, NULL);
if (fd >= 0) {
#ifdef WIN32
(void)shutdown(fd, SD_SEND);
#else /* WIN32 */
(void)shutdown(fd, SHUT_WR);
#endif /* WIN32 */
}
}
}
ERR_clear_error();
while (retry) {
int n;
errno = 0;
n = BIO_read(s_bio, buf, OSSL_HTTP_DEFAULT_MAX_RESP_LEN);
if (n > 0) {
written += BIO_write(resp, buf, n);
} else if (BIO_eof(s_bio) == 1) {
ok = 1;
retry = 0; /* EOF */
} else if (BIO_should_retry(s_bio)) {
} else {
unsigned long err = ERR_get_error();
if (err == 0) {
ok = 1;
retry = 0; /* use_ssl EOF */
} else {
fprintf(stderr, "\nHTTP failure: error %ld: %s\n", err, ERR_reason_error_string(err));
retry = 0; /* FAILED */
}
}
if (resp_len > 0 && resp_len == written) {
ok = 1;
retry = 0; /* all response has been read */
}
}
OSSL_HTTP_close(rctx, ok);
OPENSSL_free(buf);
if (!ok) {
BIO_free_all(resp);
resp = NULL;
}
return resp;
}
/*
* pkcs7-signedData bytes found indicates DER form
* in otherwise BASE64 encoded
* '\n' newline character means BASE64 line with newline at the end
* in otherwise BIO_FLAGS_BASE64_NO_NL flag must me set
* [in, out] resp: memory BIO with Authenticode Timestamp data
* [returns] none
*/
static void check_authenticode_timestamp(BIO **resp)
{
u_char *ptr = NULL;
const u_char pkcs7_signed[] = {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x02};
int i, len, pkcs7_signed_len, found = 0;
len = (int)BIO_get_mem_data(*resp, &ptr);
if (len <= 0) {
return;
}
pkcs7_signed_len = (int)sizeof pkcs7_signed;
for (i = 0; i <= len - pkcs7_signed_len; i++) {
if (memcmp(ptr + i, pkcs7_signed, (size_t)pkcs7_signed_len) == 0) {
found = 1;
break;
}
}
if (!found) {
/* BASE64 encoded Authenticode Timestamp */
BIO *b64 = BIO_new(BIO_f_base64());
if (!memchr(ptr, '\n', (size_t)len)) {
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
} else {
BIO *bio_mem = BIO_new_mem_buf(ptr, len);
BIO_push(b64, bio_mem);
}
*resp = BIO_push(b64, *resp);
}
}
/*
* Get data from HTTP server.
* [in] url: URL of the CRL distribution point or Time-Stamp Authority HTTP server
* [in] req: timestamp request
* [in] proxy: proxy to getting the timestamp through
* [in] rfc3161: Authenticode / RFC3161 Timestamp switch
* [in] cafile: file contains concatenated CA certificates in PEM format
* [in] crlfile: file contains Certificate Revocation List (CRLs)
* [returns] pointer to BIO with X509 Certificate Revocation List or timestamp response
*/
static BIO *bio_get_http(char *url, BIO *req, char *proxy, int rfc3161, char *cafile, char *crlfile)
{
BIO *tmp_bio = NULL, *s_bio = NULL, *resp = NULL;
OSSL_HTTP_REQ_CTX *rctx = NULL;
HTTP_TLS_Info info;
SSL_CTX *ssl_ctx = NULL;
char *server = NULL, *port = NULL, *path = NULL;
int timeout = -1; /* blocking mode, exactly one try, see BIO_do_connect_retry() */
int keep_alive = 1; /* prefer */
int use_ssl = 0;
if (!url) {
return NULL; /* FAILED */
}
print_proxy(proxy);
printf("Connecting to %s\n", url);
if (!OSSL_HTTP_parse_url(url, &use_ssl, NULL, &server, &port, NULL, &path, NULL, NULL)) {
return NULL; /* FAILED */
}
if (use_ssl) {
X509_STORE *store = NULL;
ssl_ctx = SSL_CTX_new(TLS_client_method());
if (cafile) {
printf("HTTPS-CAfile: %s\n", cafile);
if (crlfile)
printf("HTTPS-CRLfile: %s\n", crlfile);
store = SSL_CTX_get_cert_store(ssl_ctx);
if (x509_store_load_crlfile(store, cafile, crlfile))
SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER, verify_callback);
else
printf("Warning: HTTPS verification was skipped\n");
} else {
printf("Warning: HTTPS verification was skipped\n");
}
}
info.server = server;
info.port = port;
info.use_proxy = OSSL_HTTP_adapt_proxy(proxy, NULL, server, use_ssl) != NULL;
info.timeout = timeout;
info.ssl_ctx = ssl_ctx;
if (!req) { /* GET */
const char *expected_content_type = "application/pkix-crl";
s_bio = OSSL_HTTP_get(url, proxy, NULL, NULL, NULL, http_tls_cb, &info, 0,
NULL, expected_content_type, 0, 0, timeout);
} else { /* POST */
const char *content_type = "application/timestamp-query"; /* RFC3161 Timestamp */
const char *expected_content_type = "application/timestamp-reply";
if (!rfc3161) {
u_char *p = NULL;
long len = BIO_get_mem_data(req, &p);
tmp_bio = BIO_new(BIO_s_mem());
BIO_write(tmp_bio, p, (int)len);
req = BIO_push(tmp_bio, req);
content_type = "application/octet-stream"; /* Authenticode Timestamp */
expected_content_type = "application/octet-stream";
}
s_bio = OSSL_HTTP_transfer(&rctx, server, port, path, use_ssl, proxy, NULL,
NULL, NULL, http_tls_cb, &info, 0, NULL, content_type, req,
expected_content_type, 0, 0, timeout, keep_alive);
BIO_free(tmp_bio);
}
OPENSSL_free(server);
OPENSSL_free(port);
OPENSSL_free(path);
SSL_CTX_free(ssl_ctx);
if (s_bio) {
resp = socket_bio_read(s_bio, rctx, use_ssl);
BIO_free_all(s_bio);
if (resp && req && !rfc3161)
check_authenticode_timestamp(&resp);
} else {
fprintf(stderr, "\nHTTP failure: Failed to get data from %s\n", url);
}
return resp;
}
#endif /* OPENSSL_VERSION_NUMBER<0x30000000L */
/*
* Decode a HTTP 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)
{