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+/**
+ * XML Security Library example: Verifying a simple SAML response with X509 certificate
+ *
+ * Verifies a simple SAML response. In addition to refular verification
+ * we ensure that the signature has only one <dsig:Reference/> element
+ * with an empty or NULL URI attribute and one enveloped signature transform
+ * as it is required by SAML specification.
+ *
+ * This example was developed and tested with OpenSSL crypto library. The
+ * certificates management policies for another crypto library may break it.
+ *
+ * Usage:
+ * verify4 <signed-file> <trusted-cert-pem-file1> [<trusted-cert-pem-file2> [...]]
+ *
+ * Example (sucecess):
+ * ./verify4 verify4-res.xml rootcert.pem
+ *
+ * Example (failure):
+ * ./verify4 verify4-bad-res.xml rootcert.pem
+ * In the same time, verify3 example successfuly verifies this signature:
+ * ./verify3 verify4-bad-res.xml rootcert.pem
+ *
+ * This is free software; see Copyright file in the source
+ * distribution for preciese wording.
+ *
+ * Copyright (C) 2002-2003 Aleksey Sanin <aleksey@aleksey.com>
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <libxml/tree.h>
+#include <libxml/xmlmemory.h>
+#include <libxml/parser.h>
+
+#ifndef XMLSEC_NO_XSLT
+#include <libxslt/xslt.h>
+#include <libxslt/security.h>
+#endif /* XMLSEC_NO_XSLT */
+
+#include <xmlsec/xmlsec.h>
+#include <xmlsec/xmltree.h>
+#include <xmlsec/xmldsig.h>
+#include <xmlsec/crypto.h>
+
+xmlSecKeysMngrPtr load_trusted_certs(char** files, int files_size);
+int verify_file(xmlSecKeysMngrPtr mngr, const char* xml_file);
+
+int
+main(int argc, char **argv) {
+#ifndef XMLSEC_NO_XSLT
+ xsltSecurityPrefsPtr xsltSecPrefs = NULL;
+#endif /* XMLSEC_NO_XSLT */
+ xmlSecKeysMngrPtr mngr;
+
+ assert(argv);
+
+ if(argc < 3) {
+ fprintf(stderr, "Error: wrong number of arguments.\n");
+ fprintf(stderr, "Usage: %s <xml-file> <cert-file1> [<cert-file2> [...]]\n", argv[0]);
+ return(1);
+ }
+
+ /* Init libxml and libxslt libraries */
+ xmlInitParser();
+ LIBXML_TEST_VERSION
+ xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
+ xmlSubstituteEntitiesDefault(1);
+#ifndef XMLSEC_NO_XSLT
+ xmlIndentTreeOutput = 1;
+#endif /* XMLSEC_NO_XSLT */
+
+ /* Init libxslt */
+#ifndef XMLSEC_NO_XSLT
+ /* disable everything */
+ xsltSecPrefs = xsltNewSecurityPrefs();
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_READ_FILE, xsltSecurityForbid);
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_WRITE_FILE, xsltSecurityForbid);
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_CREATE_DIRECTORY, xsltSecurityForbid);
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_READ_NETWORK, xsltSecurityForbid);
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_WRITE_NETWORK, xsltSecurityForbid);
+ xsltSetDefaultSecurityPrefs(xsltSecPrefs);
+#endif /* XMLSEC_NO_XSLT */
+
+ /* Init xmlsec library */
+ if(xmlSecInit() < 0) {
+ fprintf(stderr, "Error: xmlsec initialization failed.\n");
+ return(-1);
+ }
+
+ /* Check loaded library version */
+ if(xmlSecCheckVersion() != 1) {
+ fprintf(stderr, "Error: loaded xmlsec library version is not compatible.\n");
+ return(-1);
+ }
+
+ /* Load default crypto engine if we are supporting dynamic
+ * loading for xmlsec-crypto libraries. Use the crypto library
+ * name ("openssl", "nss", etc.) to load corresponding
+ * xmlsec-crypto library.
+ */
+#ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
+ if(xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) < 0) {
+ fprintf(stderr, "Error: unable to load default xmlsec-crypto library. Make sure\n"
+ "that you have it installed and check shared libraries path\n"
+ "(LD_LIBRARY_PATH) envornment variable.\n");
+ return(-1);
+ }
+#endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */
+
+ /* Init crypto library */
+ if(xmlSecCryptoAppInit(NULL) < 0) {
+ fprintf(stderr, "Error: crypto initialization failed.\n");
+ return(-1);
+ }
+
+ /* Init xmlsec-crypto library */
+ if(xmlSecCryptoInit() < 0) {
+ fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
+ return(-1);
+ }
+
+ /* create keys manager and load trusted certificates */
+ mngr = load_trusted_certs(&(argv[2]), argc - 2);
+ if(mngr == NULL) {
+ return(-1);
+ }
+
+ /* verify file */
+ if(verify_file(mngr, argv[1]) < 0) {
+ xmlSecKeysMngrDestroy(mngr);
+ return(-1);
+ }
+
+ /* destroy keys manager */
+ xmlSecKeysMngrDestroy(mngr);
+
+ /* Shutdown xmlsec-crypto library */
+ xmlSecCryptoShutdown();
+
+ /* Shutdown crypto library */
+ xmlSecCryptoAppShutdown();
+
+ /* Shutdown xmlsec library */
+ xmlSecShutdown();
+
+ /* Shutdown libxslt/libxml */
+#ifndef XMLSEC_NO_XSLT
+ xsltFreeSecurityPrefs(xsltSecPrefs);
+ xsltCleanupGlobals();
+#endif /* XMLSEC_NO_XSLT */
+ xmlCleanupParser();
+
+ return(0);
+}
+
+/**
+ * load_trusted_certs:
+ * @files: the list of filenames.
+ * @files_size: the number of filenames in #files.
+ *
+ * Creates simple keys manager and load trusted certificates from PEM #files.
+ * The caller is responsible for destroing returned keys manager using
+ * @xmlSecKeysMngrDestroy.
+ *
+ * Returns the pointer to newly created keys manager or NULL if an error
+ * occurs.
+ */
+xmlSecKeysMngrPtr
+load_trusted_certs(char** files, int files_size) {
+ xmlSecKeysMngrPtr mngr;
+ int i;
+
+ assert(files);
+ assert(files_size > 0);
+
+ /* create and initialize keys manager, we use a simple list based
+ * keys manager, implement your own xmlSecKeysStore klass if you need
+ * something more sophisticated
+ */
+ mngr = xmlSecKeysMngrCreate();
+ if(mngr == NULL) {
+ fprintf(stderr, "Error: failed to create keys manager.\n");
+ return(NULL);
+ }
+ if(xmlSecCryptoAppDefaultKeysMngrInit(mngr) < 0) {
+ fprintf(stderr, "Error: failed to initialize keys manager.\n");
+ xmlSecKeysMngrDestroy(mngr);
+ return(NULL);
+ }
+
+ for(i = 0; i < files_size; ++i) {
+ assert(files[i]);
+
+ /* load trusted cert */
+ if(xmlSecCryptoAppKeysMngrCertLoad(mngr, files[i], xmlSecKeyDataFormatPem, xmlSecKeyDataTypeTrusted) < 0) {
+ fprintf(stderr,"Error: failed to load pem certificate from \"%s\"\n", files[i]);
+ xmlSecKeysMngrDestroy(mngr);
+ return(NULL);
+ }
+ }
+
+ return(mngr);
+}
+
+/**
+ * verify_file:
+ * @mngr: the pointer to keys manager.
+ * @xml_file: the signed XML file name.
+ *
+ * Verifies XML signature in #xml_file.
+ *
+ * Returns 0 on success or a negative value if an error occurs.
+ */
+int
+verify_file(xmlSecKeysMngrPtr mngr, const char* xml_file) {
+ xmlDocPtr doc = NULL;
+ xmlNodePtr node = NULL;
+ xmlSecDSigCtxPtr dsigCtx = NULL;
+ int res = -1;
+
+ assert(mngr);
+ assert(xml_file);
+
+ /* load file */
+ doc = xmlParseFile(xml_file);
+ if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
+ fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file);
+ goto done;
+ }
+
+ /* find start node */
+ node = xmlSecFindNode(xmlDocGetRootElement(doc), xmlSecNodeSignature, xmlSecDSigNs);
+ if(node == NULL) {
+ fprintf(stderr, "Error: start node not found in \"%s\"\n", xml_file);
+ goto done;
+ }
+
+ /* create signature context */
+ dsigCtx = xmlSecDSigCtxCreate(mngr);
+ if(dsigCtx == NULL) {
+ fprintf(stderr,"Error: failed to create signature context\n");
+ goto done;
+ }
+
+ /* limit the Reference URI attributes to empty or NULL */
+ dsigCtx->enabledReferenceUris = xmlSecTransformUriTypeEmpty;
+
+ /* limit allowed transforms for siganture and reference processing */
+ if((xmlSecDSigCtxEnableSignatureTransform(dsigCtx, xmlSecTransformInclC14NId) < 0) ||
+ (xmlSecDSigCtxEnableSignatureTransform(dsigCtx, xmlSecTransformExclC14NId) < 0) ||
+ (xmlSecDSigCtxEnableSignatureTransform(dsigCtx, xmlSecTransformSha1Id) < 0) ||
+ (xmlSecDSigCtxEnableSignatureTransform(dsigCtx, xmlSecTransformRsaSha1Id) < 0)) {
+
+ fprintf(stderr,"Error: failed to limit allowed siganture transforms\n");
+ goto done;
+ }
+ if((xmlSecDSigCtxEnableReferenceTransform(dsigCtx, xmlSecTransformInclC14NId) < 0) ||
+ (xmlSecDSigCtxEnableReferenceTransform(dsigCtx, xmlSecTransformExclC14NId) < 0) ||
+ (xmlSecDSigCtxEnableReferenceTransform(dsigCtx, xmlSecTransformSha1Id) < 0) ||
+ (xmlSecDSigCtxEnableReferenceTransform(dsigCtx, xmlSecTransformEnvelopedId) < 0)) {
+
+ fprintf(stderr,"Error: failed to limit allowed reference transforms\n");
+ goto done;
+ }
+
+ /* in addition, limit possible key data to valid X509 certificates only */
+ if(xmlSecPtrListAdd(&(dsigCtx->keyInfoReadCtx.enabledKeyData), BAD_CAST xmlSecKeyDataX509Id) < 0) {
+ fprintf(stderr,"Error: failed to limit allowed key data\n");
+ goto done;
+ }
+
+ /* Verify signature */
+ if(xmlSecDSigCtxVerify(dsigCtx, node) < 0) {
+ fprintf(stderr,"Error: signature verify\n");
+ goto done;
+ }
+
+ /* check that we have only one Reference */
+ if((dsigCtx->status == xmlSecDSigStatusSucceeded) &&
+ (xmlSecPtrListGetSize(&(dsigCtx->signedInfoReferences)) != 1)) {
+
+ fprintf(stderr,"Error: only one reference is allowed\n");
+ goto done;
+ }
+
+ /* print verification result to stdout */
+ if(dsigCtx->status == xmlSecDSigStatusSucceeded) {
+ fprintf(stdout, "Signature is OK\n");
+ } else {
+ fprintf(stdout, "Signature is INVALID\n");
+ }
+
+ /* success */
+ res = 0;
+
+done:
+ /* cleanup */
+ if(dsigCtx != NULL) {
+ xmlSecDSigCtxDestroy(dsigCtx);
+ }
+
+ if(doc != NULL) {
+ xmlFreeDoc(doc);
+ }
+ return(res);
+}
+
+