<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Verifying a signature with X509 certificates.</title> <meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.79"> <link rel="HOME" title="XML Security Library Reference Manual" href="index.html"> <link rel="UP" title="Examples." href="xmlsec-examples.html"> <link rel="PREVIOUS" title="Verifying a signature with keys manager." href="xmlsec-verify-with-keys-mngr.html"> <link rel="NEXT" title="Verifying a signature with additional restrictions." href="xmlsec-verify-with-restrictions.html"> <style type="text/css">.synopsis, .classsynopsis { background: #eeeeee; border: solid 1px #aaaaaa; padding: 0.5em; } .programlisting { background: #eeeeff; border: solid 1px #aaaaff; padding: 0.5em; } .variablelist { padding: 4px; margin-left: 3em; } .navigation { background: #ffeeee; border: solid 1px #ffaaaa; margin-top: 0.5em; margin-bottom: 0.5em; } .navigation a { color: #770000; } .navigation a:visited { color: #550000; } .navigation .title { font-size: 200%; }</style> </head> <body><table witdh="100%" valign="top"><tr valign="top"> <td valign="top" align="left" width="210"> <img src="../images/logo.gif" alt="XML Security Library" border="0"><p></p> <ul> <li><a href="../index.html">Home</a></li> <li><a href="../download.html">Download</a></li> <li><a href="../news.html">News</a></li> <li><a href="../documentation.html">Documentation</a></li> <ul> <li><a href="../faq.html">FAQ</a></li> <li><a href="../api/xmlsec-notes.html">Tutorial</a></li> <li><a href="../api/xmlsec-reference.html">API reference</a></li> <li><a href="../api/xmlsec-examples.html">Examples</a></li> </ul> <li><a href="../xmldsig.html">XML Digital Signature</a></li> <ul><li><a href="http://www.aleksey.com/xmlsec/xmldsig-verifier.html">Online Verifier</a></li></ul> <li><a href="../xmlenc.html">XML Encryption</a></li> <li><a href="../c14n.html">XML Canonicalization</a></li> <li><a href="../bugs.html">Reporting Bugs</a></li> <li><a href="http://www.aleksey.com/pipermail/xmlsec">Mailing list</a></li> <li><a href="../related.html">Related</a></li> <li><a href="../authors.html">Authors</a></li> </ul> <table width="100%"> <tr> <td width="15"></td> <td><a href="http://xmlsoft.org/"><img src="../images/libxml2-logo.png" alt="LibXML2" border="0"></a></td> </tr> <tr> <td width="15"></td> <td><a href="http://xmlsoft.org/XSLT"><img src="../images/libxslt-logo.png" alt="LibXSLT" border="0"></a></td> </tr> <tr> <td width="15"></td> <td><a href="http://www.openssl.org/"><img src="../images/openssl-logo.png" alt="OpenSSL" border="0"></a></td> </tr> <!--Links - start--><!--Links - end--> </table> </td> <td valign="top"><table width="100%" valign="top"><tr><td valign="top" align="left" id="xmlsecContent"> <table width="100%" class="navigation" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"> <td><a accesskey="p" href="xmlsec-verify-with-keys-mngr.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td> <td><a accesskey="u" href="xmlsec-examples.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td> <th width="100%" align="center">XML Security Library Reference Manual</th> <td><a accesskey="n" href="xmlsec-verify-with-restrictions.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td> </tr></table> <br clear="all"><div class="SECT1"> <h1 class="SECT1"><a name="XMLSEC-VERIFY-WITH-X509">Verifying a signature with X509 certificates.</a></h1> <br clear="all"><div class="SECT2"> <h2 class="SECT2"><a name="XMLSEC-EXAMPLE-VERIFY3">verify3.c</a></h2> <p></p> <div class="INFORMALEXAMPLE"> <p></p> <a name="AEN715"></a><pre class="PROGRAMLISTING">/** * XML Security Library example: Verifying a file signed with X509 certificate * * Verifies a file signed with X509 certificate. * * This example was developed and tested with OpenSSL crypto library. The * certificates management policies for another crypto library may break it. * * Usage: * verify3 <signed-file> <trusted-cert-pem-file1> [<trusted-cert-pem-file2> [...]] * * 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/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; } /* Verify signature */ if(xmlSecDSigCtxVerify(dsigCtx, node) < 0) { fprintf(stderr,"Error: signature verify\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); } </pre> <p></p> </div> </div> </div> <table class="navigation" width="100%" summary="Navigation footer" cellpadding="2" cellspacing="2"><tr valign="middle"> <td align="left"><a accesskey="p" href="xmlsec-verify-with-keys-mngr.html"><b><<< Verifying a signature with keys manager.</b></a></td> <td align="right"><a accesskey="n" href="xmlsec-verify-with-restrictions.html"><b>Verifying a signature with additional restrictions. >>></b></a></td> </tr></table> </td></tr></table></td> </tr></table></body> </html>