/** * XML Security Library example: Encrypting XML file with a dynamicaly created template. * * Encrypts XML file using a dynamicaly created template file and a DES key * from a binary file * * Usage: * ./encrypt2 * * Example: * ./encrypt2 encrypt2-doc.xml deskey.bin > encrypt2-res.xml * * The result could be decrypted with decrypt1 example: * ./decrypt1 encrypt2-res.xml deskey.bin * * This is free software; see Copyright file in the source * distribution for preciese wording. * * Copyright (C) 2002-2003 Aleksey Sanin */ #include #include #include #include #include #include #ifndef XMLSEC_NO_XSLT #include #include #endif /* XMLSEC_NO_XSLT */ #include #include #include #include #include int encrypt_file(const char* xml_file, const char* key_file); int main(int argc, char **argv) { #ifndef XMLSEC_NO_XSLT xsltSecurityPrefsPtr xsltSecPrefs = NULL; #endif /* XMLSEC_NO_XSLT */ assert(argv); if(argc != 3) { fprintf(stderr, "Error: wrong number of arguments.\n"); fprintf(stderr, "Usage: %s \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(encrypt_file(argv[1], argv[2]) < 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); } /** * encrypt_file: * @xml_file: the encryption template file name. * @key_file: the Triple DES key file. * * Encrypts #xml_file using a dynamicaly created template and DES key from * #key_file. * * Returns 0 on success or a negative value if an error occurs. */ int encrypt_file(const char* xml_file, const char* key_file) { xmlDocPtr doc = NULL; xmlNodePtr encDataNode = NULL; xmlNodePtr keyInfoNode = NULL; xmlSecEncCtxPtr encCtx = NULL; int res = -1; assert(xml_file); assert(key_file); /* load template */ doc = xmlParseFile(xml_file); if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){ fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file); goto done; } /* create encryption template to encrypt XML file and replace * its content with encryption result */ encDataNode = xmlSecTmplEncDataCreate(doc, xmlSecTransformDes3CbcId, NULL, xmlSecTypeEncElement, NULL, NULL); if(encDataNode == NULL) { fprintf(stderr, "Error: failed to create encryption template\n"); goto done; } /* we want to put encrypted data in the node */ if(xmlSecTmplEncDataEnsureCipherValue(encDataNode) == NULL) { fprintf(stderr, "Error: failed to add CipherValue node\n"); goto done; } /* add and nodes to put key name in the signed document */ keyInfoNode = xmlSecTmplEncDataEnsureKeyInfo(encDataNode, NULL); if(keyInfoNode == NULL) { fprintf(stderr, "Error: failed to add key info\n"); goto done; } if(xmlSecTmplKeyInfoAddKeyName(keyInfoNode, NULL) == NULL) { fprintf(stderr, "Error: failed to add key name\n"); goto done; } /* create encryption context, we don't need keys manager in this example */ encCtx = xmlSecEncCtxCreate(NULL); if(encCtx == NULL) { fprintf(stderr,"Error: failed to create encryption context\n"); goto done; } /* load DES key, assuming that there is not password */ encCtx->encKey = xmlSecKeyReadBinaryFile(xmlSecKeyDataDesId, key_file); if(encCtx->encKey == NULL) { fprintf(stderr,"Error: failed to load des key from binary file \"%s\"\n", key_file); goto done; } /* set key name to the file name, this is just an example! */ if(xmlSecKeySetName(encCtx->encKey, key_file) < 0) { fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file); goto done; } /* encrypt the data */ if(xmlSecEncCtxXmlEncrypt(encCtx, encDataNode, xmlDocGetRootElement(doc)) < 0) { fprintf(stderr,"Error: encryption failed\n"); goto done; } /* we template is inserted in the doc */ encDataNode = NULL; /* print encrypted data with document to stdout */ xmlDocDump(stdout, doc); /* success */ res = 0; done: /* cleanup */ if(encCtx != NULL) { xmlSecEncCtxDestroy(encCtx); } if(encDataNode != NULL) { xmlFreeNode(encDataNode); } if(doc != NULL) { xmlFreeDoc(doc); } return(res); }