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+/**
+ * XML Security Library example: Signing a file with a dynamicaly created template and an X509 certificate.
+ *
+ * Signs a file using a dynamicaly created template, key from PEM file and
+ * an X509 certificate. The signature has one reference with one enveloped
+ * transform to sign the whole document except the <dsig:Signature/> node
+ * itself. The key certificate is written in the <dsig:X509Data/> node.
+ *
+ * This example was developed and tested with OpenSSL crypto library. The
+ * certificates management policies for another crypto library may break it.
+ *
+ * Usage:
+ * sign3 <xml-doc> <pem-key>
+ *
+ * Example:
+ * ./sign3 sign3-doc.xml rsakey.pem rsacert.pem > sign3-res.xml
+ *
+ * The result signature could be validated using verify3 example:
+ * ./verify3 sign3-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/templates.h>
+#include <xmlsec/crypto.h>
+
+int sign_file(const char* xml_file, const char* key_file, const char* cert_file);
+
+int
+main(int argc, char **argv) {
+#ifndef XMLSEC_NO_XSLT
+ xsltSecurityPrefsPtr xsltSecPrefs = NULL;
+#endif /* XMLSEC_NO_XSLT */
+
+ assert(argv);
+
+ if(argc != 4) {
+ fprintf(stderr, "Error: wrong number of arguments.\n");
+ fprintf(stderr, "Usage: %s <xml-file> <key-file> <cert-file>\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);
+ }
+
+ if(sign_file(argv[1], argv[2], argv[3]) < 0) {
+ return(-1);
+ }
+
+ /* 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);
+}
+
+/**
+ * sign_file:
+ * @xml_file: the XML file name.
+ * @key_file: the PEM private key file name.
+ * @cert_file: the x509 certificate PEM file.
+ *
+ * Signs the @xml_file using private key from @key_file and dynamicaly
+ * created enveloped signature template. The certificate from @cert_file
+ * is placed in the <dsig:X509Data/> node.
+ *
+ * Returns 0 on success or a negative value if an error occurs.
+ */
+int
+sign_file(const char* xml_file, const char* key_file, const char* cert_file) {
+ xmlDocPtr doc = NULL;
+ xmlNodePtr signNode = NULL;
+ xmlNodePtr refNode = NULL;
+ xmlNodePtr keyInfoNode = NULL;
+ xmlSecDSigCtxPtr dsigCtx = NULL;
+ int res = -1;
+
+ assert(xml_file);
+ assert(key_file);
+ assert(cert_file);
+
+ /* load doc file */
+ doc = xmlParseFile(xml_file);
+ if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
+ fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file);
+ goto done;
+ }
+
+ /* create signature template for RSA-SHA1 enveloped signature */
+ signNode = xmlSecTmplSignatureCreate(doc, xmlSecTransformExclC14NId,
+ xmlSecTransformRsaSha1Id, NULL);
+ if(signNode == NULL) {
+ fprintf(stderr, "Error: failed to create signature template\n");
+ goto done;
+ }
+
+ /* add <dsig:Signature/> node to the doc */
+ xmlAddChild(xmlDocGetRootElement(doc), signNode);
+
+ /* add reference */
+ refNode = xmlSecTmplSignatureAddReference(signNode, xmlSecTransformSha1Id,
+ NULL, NULL, NULL);
+ if(refNode == NULL) {
+ fprintf(stderr, "Error: failed to add reference to signature template\n");
+ goto done;
+ }
+
+ /* add enveloped transform */
+ if(xmlSecTmplReferenceAddTransform(refNode, xmlSecTransformEnvelopedId) == NULL) {
+ fprintf(stderr, "Error: failed to add enveloped transform to reference\n");
+ goto done;
+ }
+
+ /* add <dsig:KeyInfo/> and <dsig:X509Data/> */
+ keyInfoNode = xmlSecTmplSignatureEnsureKeyInfo(signNode, NULL);
+ if(keyInfoNode == NULL) {
+ fprintf(stderr, "Error: failed to add key info\n");
+ goto done;
+ }
+
+ if(xmlSecTmplKeyInfoAddX509Data(keyInfoNode) == NULL) {
+ fprintf(stderr, "Error: failed to add X509Data node\n");
+ goto done;
+ }
+
+ /* create signature context, we don't need keys manager in this example */
+ dsigCtx = xmlSecDSigCtxCreate(NULL);
+ if(dsigCtx == NULL) {
+ fprintf(stderr,"Error: failed to create signature context\n");
+ goto done;
+ }
+
+ /* load private key, assuming that there is not password */
+ dsigCtx->signKey = xmlSecCryptoAppKeyLoad(key_file, xmlSecKeyDataFormatPem, NULL, NULL, NULL);
+ if(dsigCtx->signKey == NULL) {
+ fprintf(stderr,"Error: failed to load private pem key from \"%s\"\n", key_file);
+ goto done;
+ }
+
+ /* load certificate and add to the key */
+ if(xmlSecCryptoAppKeyCertLoad(dsigCtx->signKey, cert_file, xmlSecKeyDataFormatPem) < 0) {
+ fprintf(stderr,"Error: failed to load pem certificate \"%s\"\n", cert_file);
+ goto done;
+ }
+
+ /* set key name to the file name, this is just an example! */
+ if(xmlSecKeySetName(dsigCtx->signKey, key_file) < 0) {
+ fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
+ goto done;
+ }
+
+ /* sign the template */
+ if(xmlSecDSigCtxSign(dsigCtx, signNode) < 0) {
+ fprintf(stderr,"Error: signature failed\n");
+ goto done;
+ }
+
+ /* print signed document to stdout */
+ xmlDocDump(stdout, doc);
+
+ /* success */
+ res = 0;
+
+done:
+ /* cleanup */
+ if(dsigCtx != NULL) {
+ xmlSecDSigCtxDestroy(dsigCtx);
+ }
+
+ if(doc != NULL) {
+ xmlFreeDoc(doc);
+ }
+ return(res);
+}
+
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