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ualds.c
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ualds.c
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/* Copyright (c) 1996-2020, OPC Foundation. All rights reserved.
The source code in this file is covered under a dual-license scenario:
- RCL: for OPC Foundation members in good-standing
- GPL V2: everybody else
RCL license terms accompanied with this source code. See http://opcfoundation.org/License/RCL/1.00/
GNU General Public License as published by the Free Software Foundation;
version 2 of the License are accompanied with this source code. See http://opcfoundation.org/License/GPLv2
This source code 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.
*/
/* system includes */
#include <stdlib.h>
#include <errno.h>
#include <time.h>
/* uastack includes */
#include <opcua_serverstub.h>
#include <opcua_core.h>
#include <opcua_memory.h>
#include <opcua_string.h>
#include <opcua_pkifactory.h>
#include <opcua_endpoint.h>
/* openssl includes */
#if OPCUA_SUPPORT_PKI
#include <openssl/sha.h>
#include <openssl/ossl_typ.h>
#include <openssl/x509.h>
#endif /* OPCUA_SUPPORT_PKI */
/* local includes */
#include "config.h"
#include "ualds.h"
#include "utils.h"
#ifdef _WIN32
#include "service.h"
#endif /* _WIN32 */
#include "settings.h"
#ifdef HAVE_HDS
# include "zeroconf.h"
# include "findserversonnetwork.h"
#endif
/* local platform includes */
#include <platform.h>
#include <log.h>
#if OPCUA_SUPPORT_PKI_WIN32
# include <certstore.h>
#endif /* OPCUA_SUPPORT_PKI_WIN32 */
static int g_shutdown = 0;
static OpcUa_P_OpenSSL_CertificateStore_Config g_PKIConfig;
static OpcUa_PKIProvider g_PkiProvider;
static OpcUa_P_OpenSSL_CertificateStore_Config g_Win32Config;
static OpcUa_PKIProvider g_Win32Override;
static char g_szCertificateFile[PATH_MAX];
static char g_szCertificateKeyFile[PATH_MAX];
static char g_szCRLPath[PATH_MAX];
static char g_szTrustListPath[PATH_MAX];
static char g_szIssuerPath[PATH_MAX];
static char g_szRejectedPath[PATH_MAX];
static char g_szCertificateStorePath[PATH_MAX];
static char g_szTrustListPathOldEditedLocation[PATH_MAX];
OpcUa_ByteString g_server_certificate = OPCUA_BYTESTRING_STATICINITIALIZER;
static OpcUa_Key g_server_key;
extern OpcUa_P_TraceHook g_OpcUa_P_TraceHook;
static OpcUa_UInt32 g_StackTraceLevel = OPCUA_TRACE_OUTPUT_LEVEL_NONE;
static OpcUa_UInt32 g_numEndpoints;
static ualds_endpoint *g_pEndpoints;
static char g_szServerUri[UALDS_CONF_MAX_URI_LENGTH];
static char g_szProductUri[UALDS_CONF_MAX_URI_LENGTH];
static char g_szApplicationName[UALDS_CONF_MAX_URI_LENGTH];
static char g_szHostname[256];
static int g_ExpirationMaxAge = 600; /* 10 minutes */
static int g_bAllowLocalRegistration = 0;
static int g_MaxRejectedCertificates = 5;
static int g_MaxAgeRejectedCertificates = 1; /* days */
#ifdef _WIN32
static int g_bWin32StoreCheck = 0;
#endif /* _WIN32 */
OpcUa_Mutex g_mutex = OpcUa_Null;
int g_bEnableZeroconf = 0;
#if HAVE_OPENSSL
/* basic extensions */
#define EXT_COUNT 6
static OpcUa_Crypto_Extension ext_ent[EXT_COUNT] =
{
{"subjectAltName", 0},
{"basicConstraints", "critical, CA:FALSE"},
{"subjectKeyIdentifier", "hash"},
{"authorityKeyIdentifier", "keyid, issuer:always"},
{"keyUsage", "critical, nonRepudiation, digitalSignature, keyEncipherment, dataEncipherment, keyCertSign"},
{"extendedKeyUsage", "critical, serverAuth"}
};
#endif /* HAVE_OPENSSL */
/** event table for enum/string conversion */
static const char *g_szEndpointEventNames[] = {
"Invalid",
"SecureChannelOpened",
"SecureChannelClosed",
"SecureChannelRenewed",
"SecureChannelOpenVerifyCertificate",
"SecureChannelRenewVerifyCertificate",
"UnsupportedServiceRequested",
"RawRequest",
"DecoderError"
};
#define SECONDS_PER_YEAR 86400*365
typedef struct Status_Code_String_
{
OpcUa_StatusCode status_code;
char* status_code_str;
} Status_Code_String;
#define Status_Code_String_Count 16
static Status_Code_String status_code_to_string[Status_Code_String_Count] =
{
{ OpcUa_BadCertificateChainIncomplete, "CertificateChainIncomplete" },
{ OpcUa_BadCertificateHostNameInvalid, "CertificateHostNameInvalid" },
{ OpcUa_BadCertificateInvalid, "CertificateInvalid" },
{ OpcUa_BadCertificateIssuerRevocationUnknown, "CertificateIssuerRevocationUnknown" },
{ OpcUa_BadCertificateIssuerRevoked, "CertificateIssuerRevoked" },
{ OpcUa_BadCertificateIssuerTimeInvalid, "CertificateIssuerTimeInvalid" },
{ OpcUa_BadCertificateIssuerUseNotAllowed, "CertificateIssuerUseNotAllowed" },
{ OpcUa_BadCertificatePolicyCheckFailed, "CertificatePolicyCheckFailed" },
{ OpcUa_BadCertificateRevocationUnknown, "CertificateRevocationUnknown" },
{ OpcUa_BadCertificateRevoked, "CertificateRevoked" },
{ OpcUa_BadCertificateTimeInvalid, "CertificateTimeInvalid" },
{ OpcUa_BadCertificateUntrusted , "CertificateUntrusted" },
{ OpcUa_BadCertificateUriInvalid, "CertificateUriInvalid" },
{ OpcUa_BadCertificateUseNotAllowed, "CertificateUseNotAllowed" },
{ OpcUa_BadNoValidCertificates, "NoValidCertificates" },
{ OpcUa_BadSecurityChecksFailed, "SecurityChecksFailed" }
};
void print_failed_certificate_vaidation(OpcUa_StatusCode uaStatusCode, OpcUa_ByteString* pCertificate);
char* get_statuscode_pretty_print(OpcUa_StatusCode status_code)
{
int i = 0;
for (i = 0; i < Status_Code_String_Count; i++)
{
if (status_code_to_string[i].status_code == status_code)
{
return status_code_to_string[i].status_code_str;
}
}
return NULL;
}
/** Returns a list of configured UA LDS endpoints. */
const ualds_endpoint* ualds_endpoints(OpcUa_UInt32 *pNumEndpoints)
{
if (pNumEndpoints)
{
*pNumEndpoints = g_numEndpoints;
}
return g_pEndpoints;
}
/** Returns the lds server uri. */
const char* ualds_serveruri()
{
return g_szServerUri;
}
/** Returns the lds product uri. */
const char* ualds_producturi()
{
return g_szProductUri;
}
/** Returns the lds application name for the given locale. */
const char* ualds_applicationname(const char *szLocale)
{
/** TODO: add locale handling */
OpcUa_ReferenceParameter(szLocale);
return g_szApplicationName;
}
/* OPC UA Service forward declarations */
OpcUa_StatusCode ualds_findservers(
OpcUa_Endpoint hEndpoint,
OpcUa_Handle hContext,
OpcUa_Void **ppRequest,
OpcUa_EncodeableType *pRequestType);
OpcUa_StatusCode ualds_getendpoints(
OpcUa_Endpoint hEndpoint,
OpcUa_Handle hContext,
OpcUa_Void **ppRequest,
OpcUa_EncodeableType *pRequestType);
OpcUa_StatusCode ualds_registerserver(
OpcUa_Endpoint hEndpoint,
OpcUa_Handle hContext,
OpcUa_Void **ppRequest,
OpcUa_EncodeableType *pRequestType);
static OpcUa_StatusCode ualds_delete_security_policies();
#ifdef HAVE_HDS
OpcUa_StatusCode ualds_registerserver2(OpcUa_Endpoint hEndpoint,
OpcUa_Handle hContext,
OpcUa_Void **ppRequest,
OpcUa_EncodeableType *pRequestType);
OpcUa_StatusCode ualds_findserversonnetwork(OpcUa_Endpoint hEndpoint,
OpcUa_Handle hContext,
OpcUa_Void **ppRequest,
OpcUa_EncodeableType *pRequestType);
#endif /* HAVE_HDS */
/* OPC UA STACK Service Type configurations */
static OpcUa_ServiceType FindServersService =
{
OpcUaId_FindServersRequest,
&OpcUa_FindServersResponse_EncodeableType,
ualds_findservers,
0
};
static OpcUa_ServiceType GetEndPointsService =
{
OpcUaId_GetEndpointsRequest,
&OpcUa_GetEndpointsResponse_EncodeableType,
ualds_getendpoints,
0
};
static OpcUa_ServiceType RegisterServerService =
{
OpcUaId_RegisterServerRequest,
&OpcUa_RegisterServerResponse_EncodeableType,
ualds_registerserver,
0
};
#ifdef HAVE_HDS
static OpcUa_ServiceType RegisterServer2Service =
{
OpcUaId_RegisterServer2Request,
&OpcUa_RegisterServer2Response_EncodeableType,
ualds_registerserver2,
0
};
static OpcUa_ServiceType FindServersOnNetworkService =
{
OpcUaId_FindServersOnNetworkRequest,
&OpcUa_FindServersOnNetworkResponse_EncodeableType,
ualds_findserversonnetwork,
0
};
#endif /* HAVE_HDS */
/** Service table for EndPointOpen */
static OpcUa_ServiceType *g_ServiceTable[] =
{
&FindServersService,
&GetEndPointsService,
&RegisterServerService,
#ifdef HAVE_HDS
&RegisterServer2Service,
&FindServersOnNetworkService,
#endif /* HAVE_HDS */
0
};
static OpcUa_ServiceType *g_ServiceTableHttps[] =
{
&FindServersService,
&GetEndPointsService,
#ifdef HAVE_HDS
&FindServersOnNetworkService,
#endif /* HAVE_HDS */
0
};
/** Initializes the given \c pEndpoint structure. */
void ualds_endpoint_initialize(ualds_endpoint *pEndpoint)
{
pEndpoint->szUrl[0] = 0;
pEndpoint->nNoOfSecurityPolicies = 0;
pEndpoint->pSecurityPolicies = 0;
}
/** Cleans up all resources referenced by \c pEndpoint. */
void ualds_endpoint_clear(ualds_endpoint *pEndpoint)
{
OpcUa_UInt32 i;
if (pEndpoint->pSecurityPolicies)
{
for (i=0; i<pEndpoint->nNoOfSecurityPolicies; i++)
{
OpcUa_String_Clear(&pEndpoint->pSecurityPolicies[i].sSecurityPolicy);
if (pEndpoint->pSecurityPolicies[i].pbsClientCertificate)
{
OpcUa_ByteString_Clear(pEndpoint->pSecurityPolicies[i].pbsClientCertificate);
}
}
OpcUa_Free(pEndpoint->pSecurityPolicies);
}
}
static OpcUa_StatusCode ualds_create_security_policies()
{
OpcUa_UInt32 i, n;
int j;
char szSecurityPolicies[256] = "";
char szUrl[256] = "";
char szMessageSecurity[50] = "";
const char **szPolicyArray = 0;
const char **szModeArray = 0;
int numModes = 0;
size_t size;
OpcUa_StatusCode ret = OpcUa_Good;
int tmpInt;
int retCode = ualds_settings_begingroup("General");
if (retCode > 0)
{
ualds_log(UALDS_LOG_ERR, "Configuration error: Could not read General settings from config file.");
return OpcUa_BadConfigurationError;
}
retCode = ualds_settings_beginreadarray("Endpoints", &tmpInt);
if (retCode > 0)
{
ualds_log(UALDS_LOG_ERR, "Configuration error: Could not read number of endpoints from config file.");
return OpcUa_BadConfigurationError;
}
g_numEndpoints = tmpInt;
/* create endpoint configurastion array */
g_pEndpoints = OpcUa_Alloc(sizeof(ualds_endpoint) * g_numEndpoints);
if (g_pEndpoints == 0)
{
ualds_log(UALDS_LOG_CRIT, "Could not create endpoint configurastion array. Out of memory.");
ualds_settings_endarray();
ualds_settings_endgroup();
return OpcUa_BadOutOfMemory;
}
OpcUa_MemSet(g_pEndpoints, 0, sizeof(ualds_endpoint) * g_numEndpoints);
/* read in all endpoints configuration */
for (n=0; n<g_numEndpoints; n++)
{
retCode = ualds_settings_setarrayindex(n);
if (retCode > 0)
{
ualds_log(UALDS_LOG_ERR, "Configuration error: Could not read endpoint index from config file.");
ualds_delete_security_policies();
return OpcUa_BadConfigurationError;
}
retCode = ualds_settings_readstring("Url", g_pEndpoints[n].szUrl, UALDS_CONF_MAX_URI_LENGTH);
if (retCode > 0)
{
ualds_log(UALDS_LOG_ERR, "Configuration error: Could not read endpoint url from config file.");
ret = OpcUa_BadConfigurationError;
break;
}
replace_string(g_pEndpoints[n].szUrl, UALDS_CONF_MAX_URI_LENGTH, "[gethostname]", g_szHostname);
retCode = ualds_settings_readstring("SecurityPolicies", szSecurityPolicies, sizeof(szSecurityPolicies));
if (retCode > 0)
{
ualds_log(UALDS_LOG_ERR, "Configuration error: Could not read security policies for endpoint from config file.");
ret = OpcUa_BadConfigurationError;
break;
}
// check if there is a None secured configured. If not, it must be added manually.
char* findNoneSecured = strstr(szSecurityPolicies, "SecurityPolicy_None");
if (findNoneSecured == NULL)
{
strlcat(szSecurityPolicies, ", SecurityPolicy_None", 256);
}
g_pEndpoints[n].nNoOfSecurityPolicies = split_string(szSecurityPolicies, ',', &szPolicyArray);
if (g_pEndpoints[n].nNoOfSecurityPolicies < 1)
{
ualds_log(UALDS_LOG_ERR, "configuration error: no security policies found.");
ret = OpcUa_BadConfigurationError;
break;
}
/* allocate policy array */
size = sizeof(OpcUa_Endpoint_SecurityPolicyConfiguration) * (g_pEndpoints[n].nNoOfSecurityPolicies);
g_pEndpoints[n].pSecurityPolicies = (OpcUa_Endpoint_SecurityPolicyConfiguration*)OpcUa_Alloc((OpcUa_UInt32)size);
if (g_pEndpoints[n].pSecurityPolicies == 0)
{
/** Note: we need to cast here to non-const (void*) because the MS compiler doesn't understand,
* that this is a pointer to pointer to const data. Freeing the pointer does not modify the data,
* it only frees the array of pointers. With other compilers like GCC this works without the cast.
*/
free((void*)szPolicyArray);
szPolicyArray = 0;
ret = OpcUa_BadOutOfMemory;
break;
}
OpcUa_MemSet(g_pEndpoints[n].pSecurityPolicies, 0, size);
/* fill policy array */
for (i=0; i<g_pEndpoints[n].nNoOfSecurityPolicies; i++)
{
/* temporary store the security policy configuration name */
OpcUa_String_Initialize(&g_pEndpoints[n].pSecurityPolicies[i].sSecurityPolicy);
OpcUa_String_AttachCopy(&g_pEndpoints[n].pSecurityPolicies[i].sSecurityPolicy, (OpcUa_StringA)szPolicyArray[i]);
}
free((void*)szPolicyArray);
szPolicyArray = 0;
}
ualds_settings_endarray();
ualds_settings_endgroup();
if (OpcUa_IsGood(ret))
{
/* fill security policy information */
for (n=0; n<g_numEndpoints; n++)
{
for (i=0; i<g_pEndpoints[n].nNoOfSecurityPolicies; i++)
{
retCode = ualds_settings_begingroup(OpcUa_String_GetRawString(&g_pEndpoints[n].pSecurityPolicies[i].sSecurityPolicy));
if (retCode > 0)
{
ualds_log(UALDS_LOG_ERR, "Configuration error: Could not read security policies group from config file.");
ret = OpcUa_BadConfigurationError;
break;
}
retCode = ualds_settings_readstring("Url", szUrl, sizeof(szUrl));
if (retCode > 0)
{
ualds_log(UALDS_LOG_ERR, "Configuration error: Could not read Url from security policies group from config file.");
ret = OpcUa_BadConfigurationError;
break;
}
retCode = ualds_settings_readstring("MessageSecurity", szMessageSecurity, sizeof(szMessageSecurity));
if (retCode > 0)
{
ualds_log(UALDS_LOG_ERR, "Configuration error: Could not read MessageSecurity from security policies group from config file.");
ret = OpcUa_BadConfigurationError;
break;
}
ualds_settings_endgroup();
OpcUa_String_Clear(&g_pEndpoints[n].pSecurityPolicies[i].sSecurityPolicy);
OpcUa_String_AttachCopy(&g_pEndpoints[n].pSecurityPolicies[i].sSecurityPolicy, szUrl);
g_pEndpoints[n].pSecurityPolicies[i].uMessageSecurityModes = 0;
szModeArray = 0;
numModes = split_string(szMessageSecurity, ',', &szModeArray);
if (szModeArray == NULL)
{
return OpcUa_BadConfigurationError;
}
for (j=0; j<numModes; j++)
{
if (strcmp(szModeArray[j], "None") == 0)
{
g_pEndpoints[n].pSecurityPolicies[i].uMessageSecurityModes |= OPCUA_ENDPOINT_MESSAGESECURITYMODE_NONE;
}
else if (strcmp(szModeArray[j], "Sign") == 0)
{
g_pEndpoints[n].pSecurityPolicies[i].uMessageSecurityModes |= OPCUA_ENDPOINT_MESSAGESECURITYMODE_SIGN;
}
else if (strcmp(szModeArray[j], "SignAndEncrypt") == 0)
{
g_pEndpoints[n].pSecurityPolicies[i].uMessageSecurityModes |= OPCUA_ENDPOINT_MESSAGESECURITYMODE_SIGNANDENCRYPT;
}
else
{
ualds_log(UALDS_LOG_WARNING, "Ignored invalid message security mode '%s'.", szModeArray[j]);
}
}
if (szModeArray)
{
/* see note above */
free((void*)szModeArray);
szModeArray = 0;
}
}
}
}
return ret;
}
static OpcUa_StatusCode ualds_delete_security_policies()
{
OpcUa_UInt32 i;
if (g_pEndpoints)
{
for (i=0; i<g_numEndpoints; i++)
{
ualds_endpoint_clear(&g_pEndpoints[i]);
}
OpcUa_Free(g_pEndpoints);
g_pEndpoints = 0;
g_numEndpoints = 0;
}
return OpcUa_Good;
}
static void ualds_datetime_from_time_t(time_t t, OpcUa_DateTime *pDate)
{
OpcUa_UInt64 tmp = t;
tmp += UINT64_C(11644473600);
tmp *= 10000000;
pDate->dwHighDateTime = tmp >> 32;
pDate->dwLowDateTime = (OpcUa_UInt32)tmp;
}
#if HAVE_OPENSSL
static OpcUa_StatusCode ualds_create_selfsigned_certificates(OpcUa_Handle hCertificateStore)
{
OpcUa_StatusCode ret = OpcUa_Good;
OpcUa_CryptoProvider crypto;
OpcUa_Int32 serial = (OpcUa_Int32)time(0);
OpcUa_Crypto_NameEntry NameEntries[7];
OpcUa_UInt numNameEntries = 7;
OpcUa_Certificate pCert = OPCUA_BYTESTRING_STATICINITIALIZER;
OpcUa_Key pubKey, prvKey;
char szSubjectAltName[256] = {0};
char szCommonName[50] = {0};
char szOrganization[50] = {0};
char szOrganizationUnit[50] = {0};
char szLocality[50] = {0};
char szState[50] = {0};
char szCountry[5] = {0};
int i = 0;
UALDS_FILE* f;
UALDS_UNUSED(hCertificateStore);
ret = OpcUa_CryptoProvider_Create(OpcUa_SecurityPolicy_Basic128Rsa15, &crypto);
OpcUa_ReturnErrorIfBad(ret);
OpcUa_Key_Initialize(&pubKey);
OpcUa_Key_Initialize(&prvKey);
ret = OpcUa_Crypto_GenerateAsymmetricKeypair(
&crypto,
OpcUa_Crypto_Rsa_Id,
2048,
&pubKey,
&prvKey
);
OpcUa_GotoErrorIfBad(ret);
ualds_settings_begingroup("CertificateInfo");
ualds_settings_readstring("CommonName", szCommonName, sizeof(szCommonName));
ualds_settings_readstring("Organization", szOrganization, sizeof(szOrganization));
ualds_settings_readstring("OrganizationUnit", szOrganizationUnit, sizeof(szOrganizationUnit));
ualds_settings_readstring("Locality", szLocality, sizeof(szLocality));
ualds_settings_readstring("State", szState, sizeof(szState));
ualds_settings_readstring("Country", szCountry, sizeof(szCountry));
ualds_settings_endgroup();
i = 0;
if (strlen(szOrganization) > 0) {
NameEntries[i].key = "O"; /* Organization */
NameEntries[i++].value = szOrganization;
}
if (strlen(szOrganizationUnit) > 0) {
NameEntries[i].key = "OU"; /* Organization Unit */
NameEntries[i++].value = szOrganizationUnit;
}
if (strlen(szLocality) > 0) {
NameEntries[i].key = "L"; /* Locality */
NameEntries[i++].value = szLocality;
}
if (strlen(szState) > 0) {
NameEntries[i].key = "ST"; /* State */
NameEntries[i++].value = szState;
}
if (strlen(szCountry) > 0) {
NameEntries[i].key = "C"; /* Country */
NameEntries[i++].value = szCountry;
}
if (strlen(szCommonName) > 0) {
NameEntries[i].key = "CN"; /* Common Name */
NameEntries[i++].value = szCommonName;
}
if (strlen(g_szHostname) > 0) {
NameEntries[i].key = "DC"; /* Domain Component */
NameEntries[i++].value = g_szHostname;
}
numNameEntries = i;
snprintf(szSubjectAltName, sizeof(szSubjectAltName), "URI:%s, DNS:%s", g_szServerUri, g_szHostname);
replace_string(szSubjectAltName, sizeof(szSubjectAltName), "[gethostname]", g_szHostname);
ext_ent[0].value = szSubjectAltName;
ret = OpcUa_Crypto_CreateCertificate(
&crypto,
serial,
3 * SECONDS_PER_YEAR,
NameEntries,
numNameEntries,
pubKey,
ext_ent,
EXT_COUNT,
OPCUA_P_SHA_256,
prvKey,
&pCert);
OpcUa_GotoErrorIfBad(ret);
f = ualds_platform_fopen(g_szCertificateFile, "wb");
if (f != NULL)
{
ualds_platform_fwrite(pCert.Data, 1, pCert.Length, f);
ualds_platform_fclose(f);
}
else
{
ualds_log(UALDS_LOG_ERR, "ualds_create_selfsigned_certificates: Cloud not create self-signed certificate file. \"%s\"!", g_szCertificateFile);
}
f = ualds_platform_fopen(g_szCertificateKeyFile, "wb");
if (f != NULL)
{
ualds_platform_fwrite(prvKey.Key.Data, 1, prvKey.Key.Length, f);
ualds_platform_fclose(f);
}
else
{
ualds_log(UALDS_LOG_ERR, "ualds_create_selfsigned_certificates: Cloud not create self-signed certificate file. \"%s\"!", g_szCertificateKeyFile);
}
Error:
OpcUa_CryptoProvider_Delete(&crypto);
OpcUa_ByteString_Clear(&pCert);
OpcUa_Key_Clear(&prvKey);
OpcUa_Key_Clear(&pubKey);
return ret;
}
#endif /* HAVE_OPENSSL */
#ifdef _WIN32
static OpcUa_StatusCode ualds_override_validate_certificate(
struct _OpcUa_PKIProvider* pPKI,
OpcUa_ByteString* pCertificate,
OpcUa_Void* pCertificateStore,
OpcUa_Int* pValidationCode)
{
OpcUa_StatusCode uStatus = g_PkiProvider.ValidateCertificate(pPKI, pCertificate, pCertificateStore, pValidationCode);
if (uStatus == OpcUa_BadCertificateUntrusted && g_bAllowLocalRegistration)
{
ualds_log(UALDS_LOG_DEBUG, "ualds_override_validate_certificate: Ignoring BadCertificateUntrusted error, because AllowLocalRegistration is set to yes.");
uStatus = OpcUa_Good;
}
// Certificate store paths have changed at some point.
// Make a check using the old standard paths, for backward compatibility
if (uStatus == OpcUa_BadCertificateUntrusted)
{
OpcUa_StatusCode uStatusVerify = ualds_verify_cert_old_default_location(pCertificate, g_szCRLPath, g_szRejectedPath, pValidationCode);
if (OpcUa_IsGood(uStatusVerify))
{
ualds_log(UALDS_LOG_DEBUG, "Verifying certificate in old default store succeeded.");
uStatus = OpcUa_Good;
}
}
// Certificate store paths have changed at some point.
// Make a check using the old edited paths, for backward compatibility
if (uStatus == OpcUa_BadCertificateUntrusted)
{
OpcUa_StatusCode uStatusVerify = ualds_verify_cert_old_edited_location(pCertificate, g_szCRLPath, g_szRejectedPath, g_szTrustListPathOldEditedLocation, pValidationCode);
if (OpcUa_IsGood(uStatusVerify))
{
ualds_log(UALDS_LOG_DEBUG, "Verifying certificate in old edited store succeeded.");
uStatus = OpcUa_Good;
}
}
#if OPCUA_SUPPORT_PKI_WIN32
if (uStatus == OpcUa_BadCertificateUntrusted && g_bWin32StoreCheck)
{
OpcUa_StatusCode uStatusVerify = ualds_verify_cert_win32(pCertificate);
if (OpcUa_IsGood(uStatusVerify))
{
ualds_log(UALDS_LOG_DEBUG, "Verifying certificate in windows store succeeded.");
uStatus = OpcUa_Good;
}
}
#endif /* OPCUA_SUPPORT_PKI_WIN32 */
if (OpcUa_IsBad(uStatus))
{
print_failed_certificate_vaidation(uStatus, pCertificate);
}
return uStatus;
}
#endif /* _WIN32 */
static OpcUa_StatusCode ualds_load_certificate(OpcUa_Handle hCertificateStore)
{
OpcUa_InitializeStatus(OpcUa_Module_Server, "ualds_load_certificate");
/* load DER encoded server certificate */
uStatus = g_PkiProvider.LoadCertificate(
&g_PkiProvider,
g_szCertificateFile,
hCertificateStore,
&g_server_certificate);
if (OpcUa_IsBad(uStatus))
{
ualds_log(UALDS_LOG_ERR, "Failed to load server certificate \"%s\"! (0x%08X)", g_szCertificateFile, uStatus);
OpcUa_GotoError;
}
OpcUa_Key_Initialize(&g_server_key);
/* load DER encoded server certificate private key */
uStatus = g_PkiProvider.LoadPrivateKeyFromFile(
g_szCertificateKeyFile,
OpcUa_Crypto_Encoding_DER,
OpcUa_Null,
OpcUa_Crypto_KeyType_Rsa_Private,
&g_server_key);
if (OpcUa_IsBad(uStatus))
{
/* load PEM encoded server certificate private key */
uStatus = g_PkiProvider.LoadPrivateKeyFromFile(
g_szCertificateKeyFile,
OpcUa_Crypto_Encoding_PEM,
OpcUa_Null,
OpcUa_Crypto_KeyType_Rsa_Private,
&g_server_key);
}
if (OpcUa_IsBad(uStatus))
{
ualds_log(UALDS_LOG_ERR, "Failed to load server private key \"%s\"! (0x%08X)", g_szCertificateKeyFile, uStatus);
OpcUa_GotoError;
}
OpcUa_ReturnStatusCode;
OpcUa_BeginErrorHandling;
OpcUa_ByteString_Clear(&g_server_certificate);
OpcUa_Key_Clear(&g_server_key);
OpcUa_FinishErrorHandling;
}
static OpcUa_StatusCode ualds_security_initialize()
{
OpcUa_Handle hCertificateStore = OpcUa_Null;
char szValue[10];
OpcUa_InitializeStatus(OpcUa_Module_Server, "ualds_security_initialize");
ualds_settings_begingroup("PKI");
int reCreateOwnCertificateOnError = 0;
UALDS_SETTINGS_READSTRING(CertificateStorePath);
if (g_szCertificateStorePath[0] == 0)
{
ualds_log(UALDS_LOG_WARNING, "Certificate store path (Section: 'PKI', Key: 'CertificateStorePath') is not set in the settings file!");
}
int szCertificateStorePathLen = strlen(g_szCertificateStorePath);
// 50 characters are enough to complete the paths to subfolders. The subfolder structure is fixed.
if (szCertificateStorePathLen > PATH_MAX - 50)
{
ualds_log(UALDS_LOG_WARNING, "Certificate store path is too long!");
uStatus = OpcUa_Bad;
OpcUa_GotoError;
}
//check if path ends with dir separator
char* directory_separator = __ualds_plat_path_sep;
if (szCertificateStorePathLen > 0)
{
if (g_szCertificateStorePath[szCertificateStorePathLen - 1] != *directory_separator)
{
strlcat(g_szCertificateStorePath, directory_separator, PATH_MAX);
}
}
if (ualds_platform_mkpath(g_szCertificateStorePath) != 0)
{
g_szCertificateStorePath[0] = 0;
ualds_platform_getcwd(g_szCertificateStorePath, sizeof(g_szCertificateStorePath));
strlcat(g_szCertificateStorePath, __ualds_plat_path_sep "pki" __ualds_plat_path_sep, PATH_MAX);
ualds_log(UALDS_LOG_ALERT, "Failed to create certificate store path - using %s as path...", g_szCertificateStorePath);
}
else
{
ualds_log(UALDS_LOG_NOTICE, "Using certificate store at %s...", g_szCertificateStorePath);
}
// The folder structure of the CertificateStore is specified in OPC-UA Spec 1.03, Part 12, Table 48
strlcpy(g_szCertificateFile, g_szCertificateStorePath, PATH_MAX);
strlcat(g_szCertificateFile, "own" __ualds_plat_path_sep "certs" __ualds_plat_path_sep, PATH_MAX);
ualds_platform_mkpath(g_szCertificateFile);
strlcat(g_szCertificateFile, "ualdscert.der", PATH_MAX);
strlcpy(g_szCertificateKeyFile, g_szCertificateStorePath, PATH_MAX);
strlcat(g_szCertificateKeyFile, "own" __ualds_plat_path_sep "private" __ualds_plat_path_sep, PATH_MAX);
ualds_platform_mkpath(g_szCertificateKeyFile);
strlcat(g_szCertificateKeyFile, "ualdskey.nopass.pem", PATH_MAX);
strlcpy(g_szTrustListPath, g_szCertificateStorePath, PATH_MAX);
strlcat(g_szTrustListPath, "trusted" __ualds_plat_path_sep "certs" __ualds_plat_path_sep, PATH_MAX);
ualds_platform_mkpath(g_szTrustListPath);
strlcpy(g_szCRLPath, g_szCertificateStorePath, PATH_MAX);
strlcat(g_szCRLPath, "trusted" __ualds_plat_path_sep "crl" __ualds_plat_path_sep, PATH_MAX);
ualds_platform_mkpath(g_szCRLPath);
strlcpy(g_szRejectedPath, g_szCertificateStorePath, PATH_MAX);
strlcat(g_szRejectedPath, "rejected" __ualds_plat_path_sep "certs" __ualds_plat_path_sep, PATH_MAX);
ualds_platform_mkpath(g_szRejectedPath);
strlcpy(g_szIssuerPath, g_szCertificateStorePath, PATH_MAX);
strlcat(g_szIssuerPath, "issuer" __ualds_plat_path_sep "certs" __ualds_plat_path_sep, PATH_MAX);
ualds_platform_mkpath(g_szIssuerPath);
ualds_settings_readstring("TrustListPath", g_szTrustListPathOldEditedLocation, PATH_MAX);
#ifdef _WIN32
if (ualds_settings_readstring("Win32StoreCheck", szValue, sizeof(szValue)) == 0)
{
if (strcmp(szValue, "yes") == 0)
{
#if OPCUA_SUPPORT_PKI_WIN32
ualds_log(UALDS_LOG_DEBUG, "Win32StoreCheck is enabled.");
g_bWin32StoreCheck = 1;
#else /* OPCUA_SUPPORT_PKI_WIN32 */
ualds_log(UALDS_LOG_ERR, "Could not enable Win32StoreCheck because UaStack was built without OPCUA_SUPPORT_PKI_WIN32.");
#endif /* OPCUA_SUPPORT_PKI_WIN32 */
}
}
#endif /* _WIN32 */
/* Check if we should re-create the own certificate if we found an error */
if (ualds_settings_readstring("ReCreateOwnCertificateOnError", szValue, sizeof(szValue)) == 0)
{
if (strcmp(szValue, "yes") == 0)
{
ualds_log(UALDS_LOG_INFO, "ReCreateOwnCertificateOnError is enabled.");
reCreateOwnCertificateOnError = 1;
}
}
ualds_settings_endgroup();
#if HAVE_OPENSSL
g_PKIConfig.PkiType = OpcUa_OpenSSL_PKI;
g_PKIConfig.CertificateTrustListLocation = g_szTrustListPath;
g_PKIConfig.CertificateRevocationListLocation = g_szCRLPath;
g_PKIConfig.CertificateUntrustedListLocation = g_szRejectedPath;
g_PKIConfig.Flags = OPCUA_P_PKI_OPENSSL_USE_DEFAULT_CERT_CRL_LOOKUP_METHOD;
g_PKIConfig.Override = OpcUa_Null;
uStatus = OpcUa_PKIProvider_Create(&g_PKIConfig, &g_PkiProvider);
OpcUa_GotoErrorIfBad(uStatus);
uStatus = g_PkiProvider.OpenCertificateStore(&g_PkiProvider, &hCertificateStore);
if (OpcUa_IsBad(uStatus))
{
ualds_log(UALDS_LOG_ERR, "Failed to open certificate store! (0x%08X)", uStatus);
OpcUa_GotoError;
}
/* create self-signed certificates if no certificates are provided. */
if (ualds_platform_fileexists(g_szCertificateFile) == 0 ||
ualds_platform_fileexists(g_szCertificateKeyFile) == 0)
{
ualds_create_selfsigned_certificates(hCertificateStore);
}
else
{
if (reCreateOwnCertificateOnError)
{
int reCreateCert = 0;
/* try to load certificate and check domain name */
/* loads the server certificate */
uStatus = ualds_load_certificate(hCertificateStore);
if (OpcUa_IsBad(uStatus))
{
ualds_log(UALDS_LOG_ERR, "Failed to load server certificate! (0x%08X)", uStatus);
reCreateCert = 1;
}
else
{
OpcUa_ByteString pSubjectDNS;
uStatus = g_PkiProvider.ExtractCertificateData(&g_server_certificate, NULL, NULL, NULL, NULL, &pSubjectDNS, NULL, NULL, NULL);
if (OpcUa_IsGood(uStatus))
{
if (strcmp(pSubjectDNS.Data, g_szHostname) != 0)
{
ualds_log(UALDS_LOG_ERR, "Server certificate DNS entry (%s) and current hostname (%s) is NOT the same!", pSubjectDNS.Data, g_szHostname);
reCreateCert = 1;
}
}
else
{
ualds_log(UALDS_LOG_ERR, "Failed to extract server certificate DNS subject! (0x%08X)", uStatus);
reCreateCert = 1;
}
OpcUa_ByteString_Clear(&pSubjectDNS);
}
if (reCreateCert)
{
ualds_log(UALDS_LOG_NOTICE, "Re-Creating server certificate!");
/* clear a previously loaded certificate */
OpcUa_ByteString_Clear(&g_server_certificate);
OpcUa_Key_Clear(&g_server_key);
/* create new self-signed certificate */
ualds_create_selfsigned_certificates(hCertificateStore);
}
}
}
/* check if certificate is already loaded (during the above check) */
if (g_server_certificate.Data == OpcUa_Null)
{
/* loads the server certificate */
uStatus = ualds_load_certificate(hCertificateStore);
if (OpcUa_IsBad(uStatus))
{
ualds_log(UALDS_LOG_ERR, "Failed to load server private key \"%s\"! (0x%08X)", g_szCertificateKeyFile, uStatus);
OpcUa_GotoError;
}
}
g_PkiProvider.CloseCertificateStore(&g_PkiProvider, &hCertificateStore);
#else /* HAVE_OPENSSL */
g_PKIConfig.PkiType = OpcUa_NO_PKI;
g_PKIConfig.CertificateTrustListLocation = 0;
g_PKIConfig.CertificateRevocationListLocation = 0;
g_PKIConfig.Flags = 0;
g_PKIConfig.Override = OpcUa_Null;
#endif /* HAVE_OPENSSL */
#ifdef _WIN32
memset(&g_Win32Override, 0, sizeof(g_Win32Override));
g_Win32Override.ValidateCertificate = ualds_override_validate_certificate;
g_Win32Config = g_PKIConfig;
g_Win32Config.PkiType = OpcUa_Override;
g_Win32Config.Override = &g_Win32Override;
#endif /* _WIN32 */
ualds_create_security_policies();
OpcUa_ReturnStatusCode;
OpcUa_BeginErrorHandling;
ualds_log(UALDS_LOG_ERR, "Could not initialize UALDS PKI infrastructure.");
if (hCertificateStore != OpcUa_Null)
{
g_PkiProvider.CloseCertificateStore(&g_PkiProvider, &hCertificateStore);
}
OpcUa_FinishErrorHandling;
}
static OpcUa_StatusCode ualds_security_uninitialize()
{
OpcUa_ByteString_Clear(&g_server_certificate);
OpcUa_Key_Clear(&g_server_key);
OpcUa_PKIProvider_Delete(&g_PkiProvider);
return ualds_delete_security_policies();
}
/** File filter for scandir. All entries where this functions return non-zero,
* will be stored in scandir namelist.