573 lines
19 KiB
C
573 lines
19 KiB
C
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2012 - 2016, Marc Hoersken, <info@marc-hoersken.de>
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* Copyright (C) 2012, Mark Salisbury, <mark.salisbury@hp.com>
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* Copyright (C) 2012 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/*
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* Source file for Schannel-specific certificate verification. This code should
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* only be invoked by code in schannel.c.
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*/
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#include "curl_setup.h"
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#ifdef USE_SCHANNEL
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#ifndef USE_WINDOWS_SSPI
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# error "Can't compile SCHANNEL support without SSPI."
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#endif
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#define EXPOSE_SCHANNEL_INTERNAL_STRUCTS
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#include "schannel.h"
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#ifdef HAS_MANUAL_VERIFY_API
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#include "vtls.h"
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#include "sendf.h"
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#include "strerror.h"
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#include "curl_multibyte.h"
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#include "curl_printf.h"
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#include "hostcheck.h"
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#include "system_win32.h"
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/* The last #include file should be: */
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#include "curl_memory.h"
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#include "memdebug.h"
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#define BACKEND connssl->backend
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#define MAX_CAFILE_SIZE 1048576 /* 1 MiB */
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#define BEGIN_CERT "-----BEGIN CERTIFICATE-----"
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#define END_CERT "\n-----END CERTIFICATE-----"
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typedef struct {
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DWORD cbSize;
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HCERTSTORE hRestrictedRoot;
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HCERTSTORE hRestrictedTrust;
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HCERTSTORE hRestrictedOther;
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DWORD cAdditionalStore;
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HCERTSTORE *rghAdditionalStore;
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DWORD dwFlags;
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DWORD dwUrlRetrievalTimeout;
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DWORD MaximumCachedCertificates;
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DWORD CycleDetectionModulus;
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HCERTSTORE hExclusiveRoot;
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HCERTSTORE hExclusiveTrustedPeople;
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} CERT_CHAIN_ENGINE_CONFIG_WIN7, *PCERT_CHAIN_ENGINE_CONFIG_WIN7;
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static int is_cr_or_lf(char c)
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{
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return c == '\r' || c == '\n';
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}
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static CURLcode add_certs_to_store(HCERTSTORE trust_store,
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const char *ca_file,
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struct connectdata *conn)
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{
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CURLcode result;
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struct Curl_easy *data = conn->data;
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HANDLE ca_file_handle = INVALID_HANDLE_VALUE;
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LARGE_INTEGER file_size;
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char *ca_file_buffer = NULL;
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char *current_ca_file_ptr = NULL;
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TCHAR *ca_file_tstr = NULL;
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size_t ca_file_bufsize = 0;
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DWORD total_bytes_read = 0;
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bool more_certs = 0;
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int num_certs = 0;
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size_t END_CERT_LEN;
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ca_file_tstr = Curl_convert_UTF8_to_tchar((char *)ca_file);
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if(!ca_file_tstr) {
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char buffer[STRERROR_LEN];
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failf(data,
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"schannel: invalid path name for CA file '%s': %s",
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ca_file, Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
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result = CURLE_SSL_CACERT_BADFILE;
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goto cleanup;
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}
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/*
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* Read the CA file completely into memory before parsing it. This
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* optimizes for the common case where the CA file will be relatively
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* small ( < 1 MiB ).
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*/
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ca_file_handle = CreateFile(ca_file_tstr,
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GENERIC_READ,
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0,
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NULL,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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NULL);
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if(ca_file_handle == INVALID_HANDLE_VALUE) {
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char buffer[STRERROR_LEN];
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failf(data,
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"schannel: failed to open CA file '%s': %s",
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ca_file, Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
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result = CURLE_SSL_CACERT_BADFILE;
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goto cleanup;
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}
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if(!GetFileSizeEx(ca_file_handle, &file_size)) {
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char buffer[STRERROR_LEN];
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failf(data,
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"schannel: failed to determine size of CA file '%s': %s",
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ca_file, Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
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result = CURLE_SSL_CACERT_BADFILE;
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goto cleanup;
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}
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if(file_size.QuadPart > MAX_CAFILE_SIZE) {
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failf(data,
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"schannel: CA file exceeds max size of %u bytes",
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MAX_CAFILE_SIZE);
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result = CURLE_SSL_CACERT_BADFILE;
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goto cleanup;
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}
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ca_file_bufsize = (size_t)file_size.QuadPart;
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ca_file_buffer = (char *)malloc(ca_file_bufsize + 1);
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if(!ca_file_buffer) {
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result = CURLE_OUT_OF_MEMORY;
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goto cleanup;
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}
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result = CURLE_OK;
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while(total_bytes_read < ca_file_bufsize) {
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DWORD bytes_to_read = (DWORD)(ca_file_bufsize - total_bytes_read);
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DWORD bytes_read = 0;
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if(!ReadFile(ca_file_handle, ca_file_buffer + total_bytes_read,
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bytes_to_read, &bytes_read, NULL)) {
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char buffer[STRERROR_LEN];
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failf(data,
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"schannel: failed to read from CA file '%s': %s",
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ca_file, Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
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result = CURLE_SSL_CACERT_BADFILE;
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goto cleanup;
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}
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if(bytes_read == 0) {
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/* Premature EOF -- adjust the bufsize to the new value */
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ca_file_bufsize = total_bytes_read;
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}
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else {
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total_bytes_read += bytes_read;
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}
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}
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/* Null terminate the buffer */
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ca_file_buffer[ca_file_bufsize] = '\0';
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if(result != CURLE_OK) {
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goto cleanup;
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}
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END_CERT_LEN = strlen(END_CERT);
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more_certs = 1;
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current_ca_file_ptr = ca_file_buffer;
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while(more_certs && *current_ca_file_ptr != '\0') {
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char *begin_cert_ptr = strstr(current_ca_file_ptr, BEGIN_CERT);
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if(!begin_cert_ptr || !is_cr_or_lf(begin_cert_ptr[strlen(BEGIN_CERT)])) {
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more_certs = 0;
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}
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else {
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char *end_cert_ptr = strstr(begin_cert_ptr, END_CERT);
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if(!end_cert_ptr) {
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failf(data,
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"schannel: CA file '%s' is not correctly formatted",
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ca_file);
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result = CURLE_SSL_CACERT_BADFILE;
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more_certs = 0;
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}
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else {
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CERT_BLOB cert_blob;
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CERT_CONTEXT *cert_context = NULL;
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BOOL add_cert_result = FALSE;
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DWORD actual_content_type = 0;
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DWORD cert_size = (DWORD)
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((end_cert_ptr + END_CERT_LEN) - begin_cert_ptr);
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cert_blob.pbData = (BYTE *)begin_cert_ptr;
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cert_blob.cbData = cert_size;
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if(!CryptQueryObject(CERT_QUERY_OBJECT_BLOB,
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&cert_blob,
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CERT_QUERY_CONTENT_FLAG_CERT,
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CERT_QUERY_FORMAT_FLAG_ALL,
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0,
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NULL,
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&actual_content_type,
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NULL,
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NULL,
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NULL,
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(const void **)&cert_context)) {
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char buffer[STRERROR_LEN];
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failf(data,
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"schannel: failed to extract certificate from CA file "
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"'%s': %s",
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ca_file,
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Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
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result = CURLE_SSL_CACERT_BADFILE;
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more_certs = 0;
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}
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else {
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current_ca_file_ptr = begin_cert_ptr + cert_size;
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/* Sanity check that the cert_context object is the right type */
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if(CERT_QUERY_CONTENT_CERT != actual_content_type) {
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failf(data,
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"schannel: unexpected content type '%d' when extracting "
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"certificate from CA file '%s'",
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actual_content_type, ca_file);
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result = CURLE_SSL_CACERT_BADFILE;
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more_certs = 0;
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}
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else {
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add_cert_result =
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CertAddCertificateContextToStore(trust_store,
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cert_context,
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CERT_STORE_ADD_ALWAYS,
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NULL);
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CertFreeCertificateContext(cert_context);
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if(!add_cert_result) {
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char buffer[STRERROR_LEN];
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failf(data,
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"schannel: failed to add certificate from CA file '%s' "
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"to certificate store: %s",
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ca_file,
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Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
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result = CURLE_SSL_CACERT_BADFILE;
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more_certs = 0;
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}
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else {
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num_certs++;
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}
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}
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}
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}
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}
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}
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if(result == CURLE_OK) {
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if(!num_certs) {
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infof(data,
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"schannel: did not add any certificates from CA file '%s'\n",
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ca_file);
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}
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else {
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infof(data,
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"schannel: added %d certificate(s) from CA file '%s'\n",
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num_certs, ca_file);
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}
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}
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cleanup:
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if(ca_file_handle != INVALID_HANDLE_VALUE) {
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CloseHandle(ca_file_handle);
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}
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Curl_safefree(ca_file_buffer);
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Curl_unicodefree(ca_file_tstr);
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return result;
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}
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static CURLcode verify_host(struct Curl_easy *data,
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CERT_CONTEXT *pCertContextServer,
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const char * const conn_hostname)
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{
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CURLcode result = CURLE_PEER_FAILED_VERIFICATION;
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TCHAR *cert_hostname_buff = NULL;
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size_t cert_hostname_buff_index = 0;
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DWORD len = 0;
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DWORD actual_len = 0;
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/* CertGetNameString will provide the 8-bit character string without
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* any decoding */
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DWORD name_flags = CERT_NAME_DISABLE_IE4_UTF8_FLAG;
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#ifdef CERT_NAME_SEARCH_ALL_NAMES_FLAG
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name_flags |= CERT_NAME_SEARCH_ALL_NAMES_FLAG;
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#endif
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/* Determine the size of the string needed for the cert hostname */
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len = CertGetNameString(pCertContextServer,
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CERT_NAME_DNS_TYPE,
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name_flags,
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NULL,
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NULL,
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0);
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if(len == 0) {
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failf(data,
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"schannel: CertGetNameString() returned no "
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"certificate name information");
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result = CURLE_PEER_FAILED_VERIFICATION;
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goto cleanup;
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}
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/* CertGetNameString guarantees that the returned name will not contain
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* embedded null bytes. This appears to be undocumented behavior.
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*/
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cert_hostname_buff = (LPTSTR)malloc(len * sizeof(TCHAR));
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if(!cert_hostname_buff) {
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result = CURLE_OUT_OF_MEMORY;
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goto cleanup;
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}
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actual_len = CertGetNameString(pCertContextServer,
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CERT_NAME_DNS_TYPE,
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name_flags,
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NULL,
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(LPTSTR) cert_hostname_buff,
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len);
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/* Sanity check */
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if(actual_len != len) {
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failf(data,
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"schannel: CertGetNameString() returned certificate "
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"name information of unexpected size");
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result = CURLE_PEER_FAILED_VERIFICATION;
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goto cleanup;
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}
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/* If HAVE_CERT_NAME_SEARCH_ALL_NAMES is available, the output
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* will contain all DNS names, where each name is null-terminated
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* and the last DNS name is double null-terminated. Due to this
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* encoding, use the length of the buffer to iterate over all names.
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*/
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result = CURLE_PEER_FAILED_VERIFICATION;
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while(cert_hostname_buff_index < len &&
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cert_hostname_buff[cert_hostname_buff_index] != TEXT('\0') &&
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result == CURLE_PEER_FAILED_VERIFICATION) {
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char *cert_hostname;
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/* Comparing the cert name and the connection hostname encoded as UTF-8
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* is acceptable since both values are assumed to use ASCII
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* (or some equivalent) encoding
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*/
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cert_hostname = Curl_convert_tchar_to_UTF8(
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&cert_hostname_buff[cert_hostname_buff_index]);
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|
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if(!cert_hostname) {
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result = CURLE_OUT_OF_MEMORY;
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}
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else {
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|
int match_result;
|
||
|
|
|
||
|
|
match_result = Curl_cert_hostcheck(cert_hostname, conn_hostname);
|
||
|
|
if(match_result == CURL_HOST_MATCH) {
|
||
|
|
infof(data,
|
||
|
|
"schannel: connection hostname (%s) validated "
|
||
|
|
"against certificate name (%s)\n",
|
||
|
|
conn_hostname, cert_hostname);
|
||
|
|
result = CURLE_OK;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
size_t cert_hostname_len;
|
||
|
|
|
||
|
|
infof(data,
|
||
|
|
"schannel: connection hostname (%s) did not match "
|
||
|
|
"against certificate name (%s)\n",
|
||
|
|
conn_hostname, cert_hostname);
|
||
|
|
|
||
|
|
cert_hostname_len = _tcslen(
|
||
|
|
&cert_hostname_buff[cert_hostname_buff_index]);
|
||
|
|
|
||
|
|
/* Move on to next cert name */
|
||
|
|
cert_hostname_buff_index += cert_hostname_len + 1;
|
||
|
|
|
||
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
||
|
|
}
|
||
|
|
Curl_unicodefree(cert_hostname);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(result == CURLE_PEER_FAILED_VERIFICATION) {
|
||
|
|
failf(data,
|
||
|
|
"schannel: CertGetNameString() failed to match "
|
||
|
|
"connection hostname (%s) against server certificate names",
|
||
|
|
conn_hostname);
|
||
|
|
}
|
||
|
|
else if(result != CURLE_OK)
|
||
|
|
failf(data, "schannel: server certificate name verification failed");
|
||
|
|
|
||
|
|
cleanup:
|
||
|
|
Curl_unicodefree(cert_hostname_buff);
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
CURLcode Curl_verify_certificate(struct connectdata *conn, int sockindex)
|
||
|
|
{
|
||
|
|
SECURITY_STATUS sspi_status;
|
||
|
|
struct Curl_easy *data = conn->data;
|
||
|
|
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
||
|
|
CURLcode result = CURLE_OK;
|
||
|
|
CERT_CONTEXT *pCertContextServer = NULL;
|
||
|
|
const CERT_CHAIN_CONTEXT *pChainContext = NULL;
|
||
|
|
HCERTCHAINENGINE cert_chain_engine = NULL;
|
||
|
|
HCERTSTORE trust_store = NULL;
|
||
|
|
const char * const conn_hostname = SSL_IS_PROXY() ?
|
||
|
|
conn->http_proxy.host.name :
|
||
|
|
conn->host.name;
|
||
|
|
|
||
|
|
sspi_status =
|
||
|
|
s_pSecFn->QueryContextAttributes(&BACKEND->ctxt->ctxt_handle,
|
||
|
|
SECPKG_ATTR_REMOTE_CERT_CONTEXT,
|
||
|
|
&pCertContextServer);
|
||
|
|
|
||
|
|
if((sspi_status != SEC_E_OK) || (pCertContextServer == NULL)) {
|
||
|
|
char buffer[STRERROR_LEN];
|
||
|
|
failf(data, "schannel: Failed to read remote certificate context: %s",
|
||
|
|
Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
|
||
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(result == CURLE_OK && SSL_CONN_CONFIG(CAfile) &&
|
||
|
|
BACKEND->use_manual_cred_validation) {
|
||
|
|
/*
|
||
|
|
* Create a chain engine that uses the certificates in the CA file as
|
||
|
|
* trusted certificates. This is only supported on Windows 7+.
|
||
|
|
*/
|
||
|
|
|
||
|
|
if(Curl_verify_windows_version(6, 1, PLATFORM_WINNT, VERSION_LESS_THAN)) {
|
||
|
|
failf(data, "schannel: this version of Windows is too old to support "
|
||
|
|
"certificate verification via CA bundle file.");
|
||
|
|
result = CURLE_SSL_CACERT_BADFILE;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
/* Open the certificate store */
|
||
|
|
trust_store = CertOpenStore(CERT_STORE_PROV_MEMORY,
|
||
|
|
0,
|
||
|
|
(HCRYPTPROV)NULL,
|
||
|
|
CERT_STORE_CREATE_NEW_FLAG,
|
||
|
|
NULL);
|
||
|
|
if(!trust_store) {
|
||
|
|
char buffer[STRERROR_LEN];
|
||
|
|
failf(data, "schannel: failed to create certificate store: %s",
|
||
|
|
Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
|
||
|
|
result = CURLE_SSL_CACERT_BADFILE;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
result = add_certs_to_store(trust_store, SSL_CONN_CONFIG(CAfile),
|
||
|
|
conn);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(result == CURLE_OK) {
|
||
|
|
CERT_CHAIN_ENGINE_CONFIG_WIN7 engine_config;
|
||
|
|
BOOL create_engine_result;
|
||
|
|
|
||
|
|
memset(&engine_config, 0, sizeof(engine_config));
|
||
|
|
engine_config.cbSize = sizeof(engine_config);
|
||
|
|
engine_config.hExclusiveRoot = trust_store;
|
||
|
|
|
||
|
|
/* CertCreateCertificateChainEngine will check the expected size of the
|
||
|
|
* CERT_CHAIN_ENGINE_CONFIG structure and fail if the specified size
|
||
|
|
* does not match the expected size. When this occurs, it indicates that
|
||
|
|
* CAINFO is not supported on the version of Windows in use.
|
||
|
|
*/
|
||
|
|
create_engine_result =
|
||
|
|
CertCreateCertificateChainEngine(
|
||
|
|
(CERT_CHAIN_ENGINE_CONFIG *)&engine_config, &cert_chain_engine);
|
||
|
|
if(!create_engine_result) {
|
||
|
|
char buffer[STRERROR_LEN];
|
||
|
|
failf(data,
|
||
|
|
"schannel: failed to create certificate chain engine: %s",
|
||
|
|
Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
|
||
|
|
result = CURLE_SSL_CACERT_BADFILE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(result == CURLE_OK) {
|
||
|
|
CERT_CHAIN_PARA ChainPara;
|
||
|
|
|
||
|
|
memset(&ChainPara, 0, sizeof(ChainPara));
|
||
|
|
ChainPara.cbSize = sizeof(ChainPara);
|
||
|
|
|
||
|
|
if(!CertGetCertificateChain(cert_chain_engine,
|
||
|
|
pCertContextServer,
|
||
|
|
NULL,
|
||
|
|
pCertContextServer->hCertStore,
|
||
|
|
&ChainPara,
|
||
|
|
(data->set.ssl.no_revoke ? 0 :
|
||
|
|
CERT_CHAIN_REVOCATION_CHECK_CHAIN),
|
||
|
|
NULL,
|
||
|
|
&pChainContext)) {
|
||
|
|
char buffer[STRERROR_LEN];
|
||
|
|
failf(data, "schannel: CertGetCertificateChain failed: %s",
|
||
|
|
Curl_strerror(GetLastError(), buffer, sizeof(buffer)));
|
||
|
|
pChainContext = NULL;
|
||
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(result == CURLE_OK) {
|
||
|
|
CERT_SIMPLE_CHAIN *pSimpleChain = pChainContext->rgpChain[0];
|
||
|
|
DWORD dwTrustErrorMask = ~(DWORD)(CERT_TRUST_IS_NOT_TIME_NESTED);
|
||
|
|
dwTrustErrorMask &= pSimpleChain->TrustStatus.dwErrorStatus;
|
||
|
|
if(dwTrustErrorMask) {
|
||
|
|
if(dwTrustErrorMask & CERT_TRUST_IS_REVOKED)
|
||
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
||
|
|
" CERT_TRUST_IS_REVOKED");
|
||
|
|
else if(dwTrustErrorMask & CERT_TRUST_IS_PARTIAL_CHAIN)
|
||
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
||
|
|
" CERT_TRUST_IS_PARTIAL_CHAIN");
|
||
|
|
else if(dwTrustErrorMask & CERT_TRUST_IS_UNTRUSTED_ROOT)
|
||
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
||
|
|
" CERT_TRUST_IS_UNTRUSTED_ROOT");
|
||
|
|
else if(dwTrustErrorMask & CERT_TRUST_IS_NOT_TIME_VALID)
|
||
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
||
|
|
" CERT_TRUST_IS_NOT_TIME_VALID");
|
||
|
|
else if(dwTrustErrorMask & CERT_TRUST_REVOCATION_STATUS_UNKNOWN)
|
||
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
||
|
|
" CERT_TRUST_REVOCATION_STATUS_UNKNOWN");
|
||
|
|
else
|
||
|
|
failf(data, "schannel: CertGetCertificateChain error mask: 0x%08x",
|
||
|
|
dwTrustErrorMask);
|
||
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(result == CURLE_OK) {
|
||
|
|
if(SSL_CONN_CONFIG(verifyhost)) {
|
||
|
|
result = verify_host(conn->data, pCertContextServer, conn_hostname);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(cert_chain_engine) {
|
||
|
|
CertFreeCertificateChainEngine(cert_chain_engine);
|
||
|
|
}
|
||
|
|
|
||
|
|
if(trust_store) {
|
||
|
|
CertCloseStore(trust_store, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
if(pChainContext)
|
||
|
|
CertFreeCertificateChain(pChainContext);
|
||
|
|
|
||
|
|
if(pCertContextServer)
|
||
|
|
CertFreeCertificateContext(pCertContextServer);
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* HAS_MANUAL_VERIFY_API */
|
||
|
|
#endif /* USE_SCHANNEL */
|