a9ab65a935
[libfreerdp/crypto/certificate.c:315] -> [libfreerdp/crypto/certificate.c:316]: (warning) Either the condition 'if(fingerprint&&fprint)' is redundant or there is possible null pointer dereference: fingerprint.
691 lines
16 KiB
C
691 lines
16 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Certificate Handling
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*
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* Copyright 2011 Jiten Pathy
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* Copyright 2011-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <winpr/crypto.h>
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#include <winpr/crt.h>
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#include <winpr/file.h>
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#include <winpr/path.h>
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#include <openssl/pem.h>
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#include <openssl/rsa.h>
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static const char certificate_store_dir[] = "certs";
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static const char certificate_server_dir[] = "server";
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static const char certificate_known_hosts_file[] = "known_hosts2";
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static const char certificate_legacy_hosts_file[] = "known_hosts";
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#include <freerdp/log.h>
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#include <freerdp/crypto/certificate.h>
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#define TAG FREERDP_TAG("crypto")
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static BOOL certificate_split_line(char* line, char** host, UINT16* port,
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char**subject, char**issuer,
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char** fingerprint);
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BOOL certificate_store_init(rdpCertificateStore* certificate_store)
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{
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char* server_path = NULL;
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rdpSettings* settings;
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settings = certificate_store->settings;
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if (!PathFileExistsA(settings->ConfigPath))
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{
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if (!PathMakePathA(settings->ConfigPath, 0))
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{
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WLog_ERR(TAG, "error creating directory '%s'", settings->ConfigPath);
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goto fail;
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}
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WLog_INFO(TAG, "creating directory %s", settings->ConfigPath);
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}
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if (!(certificate_store->path = GetCombinedPath(settings->ConfigPath, (char*) certificate_store_dir)))
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goto fail;
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if (!PathFileExistsA(certificate_store->path))
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{
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if (!PathMakePathA(certificate_store->path, 0))
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{
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WLog_ERR(TAG, "error creating directory [%s]", certificate_store->path);
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goto fail;
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}
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WLog_INFO(TAG, "creating directory [%s]", certificate_store->path);
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}
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if (!(server_path = GetCombinedPath(settings->ConfigPath, (char*) certificate_server_dir)))
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goto fail;
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if (!PathFileExistsA(server_path))
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{
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if (!PathMakePathA(server_path, 0))
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{
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WLog_ERR(TAG, "error creating directory [%s]", server_path);
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goto fail;
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}
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WLog_INFO(TAG, "created directory [%s]", server_path);
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}
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if (!(certificate_store->file = GetCombinedPath(settings->ConfigPath, (char*) certificate_known_hosts_file)))
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goto fail;
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if (!(certificate_store->legacy_file = GetCombinedPath(settings->ConfigPath,
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(char*) certificate_legacy_hosts_file)))
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goto fail;
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free(server_path);
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return TRUE;
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fail:
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WLog_ERR(TAG, "certificate store initialization failed");
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free(server_path);
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free(certificate_store->path);
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free(certificate_store->file);
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certificate_store->path = NULL;
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certificate_store->file = NULL;
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return FALSE;
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}
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static int certificate_data_match_legacy(rdpCertificateStore* certificate_store,
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rdpCertificateData* certificate_data)
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{
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HANDLE fp;
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int match = 1;
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char* data;
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char* mdata;
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char* pline;
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char* hostname = NULL;
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DWORD lowSize, highSize;
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UINT64 size;
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size_t length;
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DWORD read;
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/* Assure POSIX style paths, CreateFile expects either '/' or '\\' */
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PathCchConvertStyleA(certificate_store->legacy_file, strlen(certificate_store->legacy_file), PATH_STYLE_UNIX);
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fp = CreateFileA(certificate_store->legacy_file, GENERIC_READ, FILE_SHARE_READ,
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NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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if (fp == INVALID_HANDLE_VALUE)
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return match;
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if ((lowSize = GetFileSize(fp, &highSize)) == INVALID_FILE_SIZE)
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{
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WLog_ERR(TAG, "GetFileSize(%s) returned %s [0x%08"PRIX32"]",
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certificate_store->legacy_file, strerror(errno), GetLastError());
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CloseHandle(fp);
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return match;
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}
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size = (UINT64)lowSize | ((UINT64)highSize << 32);
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if (size < 1)
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{
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CloseHandle(fp);
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return match;
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}
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mdata = (char*) malloc(size + 2);
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if (!mdata)
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{
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CloseHandle(fp);
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return match;
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}
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data = mdata;
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if (!ReadFile(fp, data, size, &read, NULL) || (read != size))
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{
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free(data);
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CloseHandle(fp);
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return match;
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}
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CloseHandle(fp);
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data[size] = '\n';
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data[size + 1] = '\0';
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pline = StrSep(&data, "\r\n");
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while (pline != NULL)
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{
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length = strlen(pline);
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if (length > 0)
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{
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hostname = StrSep(&pline, " \t");
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if (!hostname || !pline)
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WLog_WARN(TAG, "Invalid %s entry %s %s!", certificate_legacy_hosts_file,
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hostname, pline);
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else if (strcmp(hostname, certificate_data->hostname) == 0)
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{
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match = strcmp(pline, certificate_data->fingerprint);
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break;
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}
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}
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pline = StrSep(&data, "\r\n");
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}
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/* Found a valid fingerprint in legacy file,
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* copy to new file in new format. */
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if (0 == match)
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{
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rdpCertificateData* data = certificate_data_new(
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hostname,
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certificate_data->port,
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NULL, NULL,
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certificate_data->fingerprint);
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if (data)
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{
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free (data->subject);
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free (data->issuer);
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data->subject = NULL;
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data->issuer = NULL;
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if (certificate_data->subject)
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{
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data->subject = _strdup(certificate_data->subject);
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if (!data->subject)
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goto out;
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}
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if (certificate_data->issuer)
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{
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data->issuer = _strdup(certificate_data->issuer);
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if (!data->issuer)
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goto out;
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}
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match = certificate_data_print(certificate_store, data) ? 0 : 1;
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}
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out:
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certificate_data_free(data);
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}
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free(mdata);
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return match;
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}
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static int certificate_data_match_raw(rdpCertificateStore* certificate_store,
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rdpCertificateData* certificate_data,
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char** psubject, char** pissuer,
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char** fprint)
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{
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BOOL found = FALSE;
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HANDLE fp;
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size_t length;
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char* data;
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char* mdata;
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char* pline;
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int match = 1;
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DWORD lowSize, highSize;
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UINT64 size;
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char* hostname = NULL;
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char* subject = NULL;
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char* issuer = NULL;
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char* fingerprint = NULL;
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unsigned short port = 0;
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DWORD read;
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/* Assure POSIX style paths, CreateFile expects either '/' or '\\' */
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PathCchConvertStyleA(certificate_store->file, strlen(certificate_store->file), PATH_STYLE_UNIX);
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fp = CreateFileA(certificate_store->file, GENERIC_READ, FILE_SHARE_READ,
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NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_NORMAL, NULL);
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if (fp == INVALID_HANDLE_VALUE)
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return match;
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if ((lowSize = GetFileSize(fp, &highSize)) == INVALID_FILE_SIZE)
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{
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WLog_ERR(TAG, "GetFileSize(%s) returned %s [0x%08"PRIX32"]",
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certificate_store->legacy_file, strerror(errno), GetLastError());
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CloseHandle(fp);
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return match;
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}
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size = (UINT64)lowSize | ((UINT64)highSize << 32);
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if (size < 1)
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{
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CloseHandle(fp);
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return match;
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}
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mdata = (char*) malloc(size + 2);
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if (!mdata)
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{
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CloseHandle(fp);
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return match;
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}
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data = mdata;
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if (!ReadFile(fp, data, size, &read, NULL) || (read != size))
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{
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free(data);
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CloseHandle(fp);
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return match;
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}
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CloseHandle(fp);
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data[size] = '\n';
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data[size + 1] = '\0';
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pline = StrSep(&data, "\r\n");
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while (pline != NULL)
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{
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length = strlen(pline);
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if (length > 0)
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{
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if (!certificate_split_line(pline, &hostname, &port,
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&subject, &issuer, &fingerprint))
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WLog_WARN(TAG, "Invalid %s entry %s!",
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certificate_known_hosts_file, pline);
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else if (strcmp(pline, certificate_data->hostname) == 0)
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{
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int outLen;
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if (port == certificate_data->port)
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{
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found = TRUE;
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if (fingerprint)
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{
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match = (strcmp(certificate_data->fingerprint, fingerprint) == 0) ? 0 : -1;
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if (fprint)
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*fprint = _strdup(fingerprint);
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}
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if (subject && psubject)
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crypto_base64_decode(subject, strlen(subject), (BYTE**)psubject, &outLen);
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if (issuer && pissuer)
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crypto_base64_decode(issuer, strlen(issuer), (BYTE**)pissuer, &outLen);
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break;
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}
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}
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}
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pline = StrSep(&data, "\r\n");
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}
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free(mdata);
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if ((match != 0) && !found)
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match = certificate_data_match_legacy(certificate_store, certificate_data);
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return match;
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}
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BOOL certificate_get_stored_data(rdpCertificateStore* certificate_store,
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rdpCertificateData* certificate_data,
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char** subject, char** issuer,
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char** fingerprint)
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{
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int rc = certificate_data_match_raw(certificate_store, certificate_data,
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subject, issuer, fingerprint);
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if ((rc == 0) || (rc == -1))
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return TRUE;
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return FALSE;
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}
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int certificate_data_match(rdpCertificateStore* certificate_store,
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rdpCertificateData* certificate_data)
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{
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return certificate_data_match_raw(certificate_store, certificate_data,
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NULL, NULL, NULL);
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}
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BOOL certificate_data_replace(rdpCertificateStore* certificate_store,
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rdpCertificateData* certificate_data)
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{
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HANDLE fp;
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BOOL rc = FALSE;
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size_t length;
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char* data;
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char* sdata;
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char* pline;
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UINT64 size;
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DWORD read, written;
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DWORD lowSize, highSize;
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/* Assure POSIX style paths, CreateFile expects either '/' or '\\' */
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PathCchConvertStyleA(certificate_store->file, strlen(certificate_store->file), PATH_STYLE_UNIX);
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fp = CreateFileA(certificate_store->file, GENERIC_READ | GENERIC_WRITE, 0,
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NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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if (fp == INVALID_HANDLE_VALUE)
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return FALSE;
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if ((lowSize = GetFileSize(fp, &highSize)) == INVALID_FILE_SIZE)
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{
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WLog_ERR(TAG, "GetFileSize(%s) returned %s [0x%08"PRIX32"]",
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certificate_store->legacy_file, strerror(errno), GetLastError());
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CloseHandle(fp);
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return FALSE;
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}
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size = (UINT64)lowSize | ((UINT64)highSize << 32);
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if (size < 1)
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{
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CloseHandle(fp);
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return FALSE;
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}
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data = (char*) malloc(size + 2);
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if (!data)
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{
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fclose(fp);
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return FALSE;
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}
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if (!ReadFile(fp, data, size, &read, NULL) || (read != size))
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{
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free(data);
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CloseHandle(fp);
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return FALSE;
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}
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if (SetFilePointer(fp, 0, NULL, FILE_BEGIN) == INVALID_SET_FILE_POINTER)
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{
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WLog_ERR(TAG, "SetFilePointer(%s) returned %s [0x%08"PRIX32"]",
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certificate_store->file, strerror(errno), GetLastError());
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free(data);
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CloseHandle(fp);
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return FALSE;
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}
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if (!SetEndOfFile(fp))
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{
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WLog_ERR(TAG, "SetEndOfFile(%s) returned %s [0x%08"PRIX32"]",
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certificate_store->file, strerror(errno), GetLastError());
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free(data);
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CloseHandle(fp);
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return FALSE;
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}
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/* Write the file back out, with appropriate fingerprint substitutions */
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data[size] = '\n';
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data[size + 1] = '\0';
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sdata = data;
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pline = StrSep(&sdata, "\r\n");
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while (pline != NULL)
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{
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length = strlen(pline);
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if (length > 0)
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{
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UINT16 port = 0;
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char* hostname = NULL;
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char* fingerprint = NULL;
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char* subject = NULL;
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char* issuer = NULL;
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char* tdata;
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if (!certificate_split_line(pline, &hostname, &port, &subject, &issuer, &fingerprint))
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WLog_WARN(TAG, "Skipping invalid %s entry %s!",
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certificate_known_hosts_file, pline);
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else
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{
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/* If this is the replaced hostname, use the updated fingerprint. */
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if ((strcmp(hostname, certificate_data->hostname) == 0) &&
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(port == certificate_data->port))
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{
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fingerprint = certificate_data->fingerprint;
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rc = TRUE;
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}
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size = _snprintf(NULL, 0, "%s %"PRIu16" %s %s %s\n", hostname, port, fingerprint, subject, issuer);
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tdata = malloc(size + 1);
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if (!tdata)
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{
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WLog_ERR(TAG, "malloc(%s) returned %s [0x%08X]",
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certificate_store->file, strerror(errno), errno);
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free(data);
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CloseHandle(fp);
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return FALSE;
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}
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if (_snprintf(tdata, size + 1, "%s %"PRIu16" %s %s %s\n", hostname, port, fingerprint, subject, issuer) != size)
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{
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WLog_ERR(TAG, "_snprintf(%s) returned %s [0x%08X]",
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certificate_store->file, strerror(errno), errno);
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free(tdata);
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free(data);
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CloseHandle(fp);
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return FALSE;
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}
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if (!WriteFile(fp, tdata, size, &written, NULL) || (written != size))
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{
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WLog_ERR(TAG, "WriteFile(%s) returned %s [0x%08X]",
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certificate_store->file, strerror(errno), errno);
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free(tdata);
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free(data);
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CloseHandle(fp);
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return FALSE;
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}
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free(tdata);
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}
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}
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pline = StrSep(&sdata, "\r\n");
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}
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CloseHandle(fp);
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free(data);
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return rc;
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}
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BOOL certificate_split_line(char* line, char** host, UINT16* port, char** subject,
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char** issuer, char** fingerprint)
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{
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char* cur;
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size_t length = strlen(line);
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if (length <= 0)
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return FALSE;
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cur = StrSep(&line, " \t");
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if (!cur)
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return FALSE;
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*host = cur;
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cur = StrSep(&line, " \t");
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if (!cur)
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return FALSE;
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if(sscanf(cur, "%hu", port) != 1)
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return FALSE;
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cur = StrSep(&line, " \t");
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if (!cur)
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return FALSE;
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*fingerprint = cur;
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cur = StrSep(&line, " \t");
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if (!cur)
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return FALSE;
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*subject = cur;
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cur = StrSep(&line, " \t");
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if (!cur)
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return FALSE;
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*issuer = cur;
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return TRUE;
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}
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BOOL certificate_data_print(rdpCertificateStore* certificate_store, rdpCertificateData* certificate_data)
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{
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HANDLE fp;
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char* tdata;
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UINT64 size;
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DWORD written;
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/* reopen in append mode */
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/* Assure POSIX style paths, CreateFile expects either '/' or '\\' */
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|
PathCchConvertStyleA(certificate_store->file, strlen(certificate_store->file), PATH_STYLE_UNIX);
|
|
fp = CreateFileA(certificate_store->file, GENERIC_WRITE, 0,
|
|
NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
|
|
|
|
if (fp == INVALID_HANDLE_VALUE)
|
|
return FALSE;
|
|
|
|
if (SetFilePointer(fp, 0, NULL, FILE_END) == INVALID_SET_FILE_POINTER)
|
|
{
|
|
WLog_ERR(TAG, "SetFilePointer(%s) returned %s [0x%08"PRIX32"]",
|
|
certificate_store->file, strerror(errno), GetLastError());
|
|
CloseHandle(fp);
|
|
return FALSE;
|
|
}
|
|
|
|
size = _snprintf(NULL, 0, "%s %"PRIu16" %s %s %s\n", certificate_data->hostname, certificate_data->port,
|
|
certificate_data->fingerprint, certificate_data->subject,
|
|
certificate_data->issuer);
|
|
tdata = malloc(size + 1);
|
|
if (!tdata)
|
|
{
|
|
WLog_ERR(TAG, "malloc(%s) returned %s [0x%08X]",
|
|
certificate_store->file, strerror(errno), errno);
|
|
CloseHandle(fp);
|
|
return FALSE;
|
|
}
|
|
if (_snprintf(tdata, size + 1, "%s %"PRIu16" %s %s %s\n", certificate_data->hostname, certificate_data->port,
|
|
certificate_data->fingerprint, certificate_data->subject,
|
|
certificate_data->issuer) != size)
|
|
{
|
|
WLog_ERR(TAG, "_snprintf(%s) returned %s [0x%08X]",
|
|
certificate_store->file, strerror(errno), errno);
|
|
free(tdata);
|
|
CloseHandle(fp);
|
|
return FALSE;
|
|
}
|
|
if (!WriteFile(fp, tdata, size, &written, NULL) || (written != size))
|
|
{
|
|
WLog_ERR(TAG, "WriteFile(%s) returned %s [0x%08X]",
|
|
certificate_store->file, strerror(errno), errno);
|
|
free(tdata);
|
|
CloseHandle(fp);
|
|
return FALSE;
|
|
}
|
|
free(tdata);
|
|
|
|
CloseHandle(fp);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
rdpCertificateData* certificate_data_new(char* hostname, UINT16 port, char* subject, char* issuer, char* fingerprint)
|
|
{
|
|
size_t i;
|
|
rdpCertificateData* certdata;
|
|
|
|
if (!hostname)
|
|
return NULL;
|
|
|
|
if (!fingerprint)
|
|
return NULL;
|
|
|
|
certdata = (rdpCertificateData *)calloc(1, sizeof(rdpCertificateData));
|
|
if (!certdata)
|
|
return NULL;
|
|
|
|
certdata->port = port;
|
|
certdata->hostname = _strdup(hostname);
|
|
if (subject)
|
|
certdata->subject = crypto_base64_encode((BYTE*)subject, strlen(subject));
|
|
else
|
|
certdata->subject = crypto_base64_encode((BYTE*)"", 0);
|
|
if (issuer)
|
|
certdata->issuer = crypto_base64_encode((BYTE*)issuer, strlen(issuer));
|
|
else
|
|
certdata->issuer = crypto_base64_encode((BYTE*)"", 0);
|
|
certdata->fingerprint = _strdup(fingerprint);
|
|
|
|
if (!certdata->hostname || !certdata->subject ||
|
|
!certdata->issuer || !certdata->fingerprint)
|
|
goto fail;
|
|
|
|
for (i=0; i<strlen(hostname); i++)
|
|
certdata->hostname[i] = tolower(certdata->hostname[i]);
|
|
|
|
return certdata;
|
|
|
|
fail:
|
|
free(certdata->hostname);
|
|
free(certdata->subject);
|
|
free(certdata->issuer);
|
|
free(certdata->fingerprint);
|
|
free(certdata);
|
|
return NULL;
|
|
}
|
|
|
|
void certificate_data_free(rdpCertificateData* certificate_data)
|
|
{
|
|
if (certificate_data != NULL)
|
|
{
|
|
free(certificate_data->hostname);
|
|
free(certificate_data->subject);
|
|
free(certificate_data->issuer);
|
|
free(certificate_data->fingerprint);
|
|
free(certificate_data);
|
|
}
|
|
}
|
|
|
|
rdpCertificateStore* certificate_store_new(rdpSettings* settings)
|
|
{
|
|
rdpCertificateStore* certificate_store;
|
|
|
|
certificate_store = (rdpCertificateStore*) calloc(1, sizeof(rdpCertificateStore));
|
|
|
|
if (!certificate_store)
|
|
return NULL;
|
|
|
|
certificate_store->settings = settings;
|
|
|
|
if (!certificate_store_init(certificate_store))
|
|
{
|
|
free(certificate_store);
|
|
return NULL;
|
|
}
|
|
|
|
return certificate_store;
|
|
}
|
|
|
|
void certificate_store_free(rdpCertificateStore* certstore)
|
|
{
|
|
if (certstore != NULL)
|
|
{
|
|
free(certstore->path);
|
|
free(certstore->file);
|
|
free(certstore->legacy_file);
|
|
free(certstore);
|
|
}
|
|
}
|