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For example, XML Security Library (and + the built-in default keys store) have no synchronization and + you'll need to implement a custom keys store if you want to + add or remove keys while other threads use the store.</p> +<p> </p> +<div class="EXAMPLE"> +<a name="AEN400"></a><p><b>Example 4. Creating a custom keys manager.</b></p> +<pre class="PROGRAMLISTING">/** + * create_files_keys_mngr: + * + * Creates a files based keys manager: we assume that key name is + * the key file name, + * + * Returns pointer to newly created keys manager or NULL if an error occurs. + */ +xmlSecKeysMngrPtr +create_files_keys_mngr(void) { + xmlSecKeyStorePtr keysStore; + xmlSecKeysMngrPtr mngr; + + /* create files based keys store */ + keysStore = xmlSecKeyStoreCreate(files_keys_store_get_klass()); + if(keysStore == NULL) { + fprintf(stderr, "Error: failed to create keys store.\n"); + return(NULL); + } + + /* create keys manager */ + mngr = xmlSecKeysMngrCreate(); + if(mngr == NULL) { + fprintf(stderr, "Error: failed to create keys manager.\n"); + xmlSecKeyStoreDestroy(keysStore); + return(NULL); + } + + /* add store to keys manager, from now on keys manager destroys the store if needed */ + if(xmlSecKeysMngrAdoptKeysStore(mngr, keysStore) < 0) { + fprintf(stderr, "Error: failed to add keys store to keys manager.\n"); + xmlSecKeyStoreDestroy(keysStore); + xmlSecKeysMngrDestroy(mngr); + return(NULL); + } + + /* initialize crypto library specific data in keys manager */ + if(xmlSecCryptoKeysMngrInit(mngr) < 0) { + fprintf(stderr, "Error: failed to initialize crypto data in keys manager.\n"); + xmlSecKeysMngrDestroy(mngr); + return(NULL); + } + + /* set the get key callback */ + mngr->getKey = xmlSecKeysMngrGetKey; + return(mngr); +} + +/**************************************************************************** + * + * Files Keys Store: we assume that key's name (content of the + * <dsig:KeyName/> element is a name of the file with a key. + * Attention: this probably not a good solution for high traffic systems. + * + ***************************************************************************/ +static xmlSecKeyPtr files_keys_store_find_key (xmlSecKeyStorePtr store, + const xmlChar* name, + xmlSecKeyInfoCtxPtr keyInfoCtx); +static xmlSecKeyStoreKlass files_keys_store_klass = { + sizeof(xmlSecKeyStoreKlass), + sizeof(xmlSecKeyStore), + BAD_CAST "files-based-keys-store", /* const xmlChar* name; */ + NULL, /* xmlSecKeyStoreInitializeMethod initialize; */ + NULL, /* xmlSecKeyStoreFinalizeMethod finalize; */ + files_keys_store_find_key, /* xmlSecKeyStoreFindKeyMethod findKey; */ + + /* reserved for the future */ + NULL, /* void* reserved0; */ + NULL, /* void* reserved1; */ +}; + +/** + * files_keys_store_get_klass: + * + * The files based keys store klass: we assume that key name is the + * key file name, + * + * Returns files based keys store klass. + */ +xmlSecKeyStoreId +files_keys_store_get_klass(void) { + return(&files_keys_store_klass); +} + +/** + * files_keys_store_find_key: + * @store: the pointer to default keys store. + * @name: the desired key name. + * @keyInfoCtx: the pointer to <dsig:KeyInfo/> node processing context. + * + * Lookups key in the @store. + * + * Returns pointer to key or NULL if key not found or an error occurs. + */ +static xmlSecKeyPtr +files_keys_store_find_key(xmlSecKeyStorePtr store, const xmlChar* name, xmlSecKeyInfoCtxPtr keyInfoCtx) { + xmlSecKeyPtr key; + const xmlChar* p; + + assert(store); + assert(keyInfoCtx); + + /* it's possible to do not have the key name or desired key type + * but we could do nothing in this case */ + if((name == NULL) || (keyInfoCtx->keyReq.keyId == xmlSecKeyDataIdUnknown)){ + return(NULL); + } + + /* we don't want to open files in a folder other than "current"; + * to prevent it limit the characters in the key name to alpha/digit, + * '.', '-' or '_'. + */ + for(p = name; (*p) != '\0'; ++p) { + if(!isalnum((*p)) && ((*p) != '.') && ((*p) != '-') && ((*p) != '_')) { + return(NULL); + } + } + + if((keyInfoCtx->keyReq.keyId == xmlSecKeyDataDsaId) || (keyInfoCtx->keyReq.keyId == xmlSecKeyDataRsaId)) { + /* load key from a pem file, if key is not found then it's an error (is it?) */ + key = xmlSecCryptoAppKeyLoad(name, xmlSecKeyDataFormatPem, NULL, NULL, NULL); + if(key == NULL) { + fprintf(stderr,"Error: failed to load pem key from \"%s\"\n", name); + return(NULL); + } + } else { + /* otherwise it's a binary key, if key is not found then it's an error (is it?) */ + key = xmlSecKeyReadBinaryFile(keyInfoCtx->keyReq.keyId, name); + if(key == NULL) { + fprintf(stderr,"Error: failed to load key from binary file \"%s\"\n", name); + return(NULL); + } + } + + /* set key name */ + if(xmlSecKeySetName(key, name) < 0) { + fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", name); + xmlSecKeyDestroy(key); + return(NULL); + } + + return(key); +} + </pre> +<p><a href="xmlsec-custom-keys-manager.html#XMLSEC-EXAMPLE-DECRYPT3">Full program listing</a></p> +</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-notes-keys-mngr-verify-decrypt.html"><b><<< Using keys manager for verification/decryption.</b></a></td> +<td align="right"><a accesskey="n" href="xmlsec-notes-x509.html"><b>Using X509 Certificates. >>></b></a></td> +</tr></table> +</td></tr></table></td> +</tr></table></body> +</html> |