| -rw-r--r-- | include/opkele/consumer.h | 6 | ||||
| -rw-r--r-- | include/opkele/exception.h | 9 | ||||
| -rw-r--r-- | lib/consumer.cc | 6 |
3 files changed, 18 insertions, 3 deletions
diff --git a/include/opkele/consumer.h b/include/opkele/consumer.h index 50ff692..c463787 100644 --- a/include/opkele/consumer.h +++ b/include/opkele/consumer.h @@ -6,163 +6,169 @@ /** * @file * @brief OpenID consumer-side functionality */ namespace opkele { /** * implementation of basic consumer functionality * * @note * The consumer uses libcurl internally, which means that if you're using * libopkele in multithreaded environment you should call curl_global_init * yourself before spawning any threads. */ class consumer_t { public: virtual ~consumer_t() { } /** * store association. The function should be overridden in the real * implementation to provide persistent associations store. * @param server the OpenID server * @param handle association handle * @param secret the secret associated with the server and handle * @param expires_in the number of seconds until the handle is expired * @return the auto_ptr<> for the newly allocated association_t object */ virtual assoc_t store_assoc(const string& server,const string& handle,const secret_t& secret,int expires_in) = 0; /** * retrieve stored association. The function should be overridden * in the real implementation to provide persistent assocations * store. * * @note * The user is responsible for handling associations expiry and * this function should never return an expired or invalidated * association. * * @param server the OpenID server * @param handle association handle * @return the autho_ptr<> for the newly allocated association_t object * @throw failed_lookup if no unexpired association found */ virtual assoc_t retrieve_assoc(const string& server,const string& handle) = 0; /** * invalidate stored association. The function should be overridden * in the real implementation of the consumer. * @param server the OpenID server * @param handle association handle */ virtual void invalidate_assoc(const string& server,const string& handle) = 0; /** * retrieve any unexpired association for the server. If the * function is not overridden in the real implementation, the new * association will be established for each request. * * @note * The user is responsible for handling associations and this * function should never return an expired or invalidated * association. * + * @note + * It may be a good idea to pre-expire associations shortly before + * their time is really up to avoid association expiry in the + * middle of negotiations. + * * @param server the OpenID server * @return the auto_ptr<> for the newly allocated association_t object * @throw failed_lookup in case of absence of the handle */ virtual assoc_t find_assoc(const string& server); /** * retrieve the metainformation contained in link tags from the * page pointed by url. the function may implement caching of the * information. * @param url url to harvest for link tags * @param server reference to the string object where to put * openid.server value * @param delegate reference to the string object where to put the * openid.delegate value (if any) */ virtual void retrieve_links(const string& url,string& server,string& delegate); /** * perform the associate request to OpenID server. * @param server the OpenID server * @return the auto_ptr<> for the newly allocated association_t * object, representing established association * @throw exception in case of error */ assoc_t associate(const string& server); /** * prepare the parameters for the checkid_immediate * request. * @param identity the identity to verify * @param return_to the return_to url to pass with the request * @param trust_root the trust root to advertise with the request * @param ext pointer to an extension(s) hooks object * @return the location string * @throw exception in case of error */ virtual string checkid_immediate(const string& identity,const string& return_to,const string& trust_root="",extension_t *ext=0); /** * prepare the parameters for the checkid_setup * request. * @param identity the identity to verify * @param return_to the return_to url to pass with the request * @param trust_root the trust root to advertise with the request * @param ext pointer to an extension(s) hooks object * @return the location string * @throw exception in case of error */ virtual string checkid_setup(const string& identity,const string& return_to,const string& trust_root="",extension_t *ext=0); /** * the actual implementation behind checkid_immediate() and * checkid_setup() functions. * @param mode checkid_* mode - either mode_checkid_immediate or mode_checkid_setup * @param identity the identity to verify * @param return_to the return_to url to pass with the request * @param trust_root the trust root to advertise with the request * @param ext pointer to an extension(s) hooks object * @return the location string * @throw exception in case of error */ virtual string checkid_(mode_t mode,const string& identity,const string& return_to,const string& trust_root="",extension_t *ext=0); /** * verify the id_res response * @param pin the response parameters * @param identity the identity being checked (if not specified, * @param ext pointer to an extension(s) hooks object * extracted from the openid.identity parameter * @throw id_res_mismatch in case of signature mismatch * @throw id_res_setup in case of openid.user_setup_url failure * (supposedly checkid_immediate only) * @throw id_res_failed in case of failure + * @throw id_res_expired_on_delivery if the association expired before it could've been verified * @throw exception in case of other failures */ virtual void id_res(const params_t& pin,const string& identity="",extension_t *ext=0); /** * perform a check_authentication request. * @param server the OpenID server * @param p request parameters */ void check_authentication(const string& server,const params_t& p); /** * normalize URL by adding http:// and trailing slash if needed. * @param url * @return normalized url */ static string normalize(const string& url); /** * Canonicalize URL, by normalizing its appearance and following redirects. * @param url * @return canonicalized url */ virtual string canonicalize(const string& url); }; } #endif /* __OPKELE_CONSUMER_H */ diff --git a/include/opkele/exception.h b/include/opkele/exception.h index 753a818..2ff44b7 100644 --- a/include/opkele/exception.h +++ b/include/opkele/exception.h @@ -109,118 +109,127 @@ namespace opkele { /** * thrown on failed assertion */ class failed_assertion : public exception { public: failed_assertion(OPKELE_E_PARS) : exception(OPKELE_E_CONS) { } }; /** * thrown if the handle being retrieved is invalid */ class invalid_handle : public exception { public: invalid_handle(OPKELE_E_PARS) : exception(OPKELE_E_CONS) { } }; /** * thrown if the handle passed to check_authentication request is not * stateless */ class stateful_handle : public exception { public: stateful_handle(OPKELE_E_PARS) : exception(OPKELE_E_CONS) { } }; /** * thrown if check_authentication request fails */ class failed_check_authentication : public exception { public: failed_check_authentication(OPKELE_E_PARS) : exception(OPKELE_E_CONS) { } }; /** * thrown if the id_res request result is negative */ class id_res_failed : public exception { public: id_res_failed(OPKELE_E_PARS) : exception(OPKELE_E_CONS) { } }; /** * thrown if the user_setup_url is provided with negative response */ class id_res_setup : public id_res_failed { public: string setup_url; id_res_setup(OPKELE_E_PARS,const string& su) : id_res_failed(OPKELE_E_CONS), setup_url(su) { } ~id_res_setup() throw() { } }; /** * thrown in case of signature mismatch */ class id_res_mismatch : public id_res_failed { public: id_res_mismatch(OPKELE_E_PARS) : id_res_failed(OPKELE_E_CONS) { } }; /** + * thrown if the association has expired before it could've been verified. + */ + class id_res_expired_on_delivery : public id_res_failed { + public: + id_res_expired_on_delivery(OPKELE_E_PARS) + : id_res_failed(OPKELE_E_CONS) { } + }; + + /** * openssl malfunction occured */ class exception_openssl : public exception { public: unsigned long _error; string _ssl_string; exception_openssl(OPKELE_E_PARS); ~exception_openssl() throw() { } }; /** * network operation related error occured */ class exception_network : public exception { public: exception_network(OPKELE_E_PARS) : exception(OPKELE_E_CONS) { } }; /** * network operation related error occured, specifically, related to * libcurl */ class exception_curl : public exception_network { public: CURLcode _error; string _curl_string; exception_curl(OPKELE_E_PARS); exception_curl(OPKELE_E_PARS,CURLcode e); ~exception_curl() throw() { } }; /** * not implemented (think pure virtual) member function executed, signfies * programmer error */ class not_implemented : public exception { public: not_implemented(OPKELE_E_PARS) : exception(OPKELE_E_CONS) { } }; /** * internal error, indicates internal libopkele problem */ class internal_error : public exception { public: internal_error(OPKELE_E_PARS) : exception(OPKELE_E_CONS) { } }; } #endif /* __OPKELE_EXCEPTION_H */ diff --git a/lib/consumer.cc b/lib/consumer.cc index 66db7dd..9f7530f 100644 --- a/lib/consumer.cc +++ b/lib/consumer.cc @@ -123,159 +123,159 @@ namespace opkele { }else{ util::bignum_t s_pub = util::base64_to_bignum(p.get_param("dh_server_public")); vector<unsigned char> ck(DH_size(dh)+1); unsigned char *ckptr = &(ck.front())+1; int cklen = DH_compute_key(ckptr,s_pub,dh); if(cklen<0) throw exception_openssl(OPKELE_CP_ "failed to DH_compute_key()"); if(cklen && (*ckptr)&0x80) { (*(--ckptr)) = 0; ++cklen; } unsigned char key_sha1[SHA_DIGEST_LENGTH]; SHA1(ckptr,cklen,key_sha1); secret.enxor_from_base64(key_sha1,p.get_param("enc_mac_key")); } int expires_in = 0; if(p.has_param("expires_in")) { expires_in = util::string_to_long(p.get_param("expires_in")); }else if(p.has_param("issued") && p.has_param("expiry")) { expires_in = util::w3c_to_time(p.get_param("expiry"))-util::w3c_to_time(p.get_param("issued")); }else throw bad_input(OPKELE_CP_ "no expiration information"); return store_assoc(server,p.get_param("assoc_handle"),secret,expires_in); } string consumer_t::checkid_immediate(const string& identity,const string& return_to,const string& trust_root,extension_t *ext) { return checkid_(mode_checkid_immediate,identity,return_to,trust_root,ext); } string consumer_t::checkid_setup(const string& identity,const string& return_to,const string& trust_root,extension_t *ext) { return checkid_(mode_checkid_setup,identity,return_to,trust_root,ext); } string consumer_t::checkid_(mode_t mode,const string& identity,const string& return_to,const string& trust_root,extension_t *ext) { params_t p; if(mode==mode_checkid_immediate) p["mode"]="checkid_immediate"; else if(mode==mode_checkid_setup) p["mode"]="checkid_setup"; else throw bad_input(OPKELE_CP_ "unknown checkid_* mode"); string iurl = canonicalize(identity); string server, delegate; retrieve_links(iurl,server,delegate); p["identity"] = delegate.empty()?iurl:delegate; if(!trust_root.empty()) p["trust_root"] = trust_root; p["return_to"] = return_to; try { string ah = find_assoc(server)->handle(); p["assoc_handle"] = ah; }catch(failed_lookup& fl) { string ah = associate(server)->handle(); p["assoc_handle"] = ah; } if(ext) ext->checkid_hook(p,identity); return p.append_query(server); } void consumer_t::id_res(const params_t& pin,const string& identity,extension_t *ext) { if(pin.has_param("openid.user_setup_url")) throw id_res_setup(OPKELE_CP_ "assertion failed, setup url provided",pin.get_param("openid.user_setup_url")); string server,delegate; retrieve_links(identity.empty()?pin.get_param("openid.identity"):canonicalize(identity),server,delegate); params_t ps; try { assoc_t assoc = retrieve_assoc(server,pin.get_param("openid.assoc_handle")); - if(assoc->is_expired()) /* TODO: or should I throw some other exception to force programmer fix his implementation? */ - throw failed_lookup(OPKELE_CP_ "retrieve_assoc() has returned expired handle"); + if(assoc->is_expired()) + throw id_res_expired_on_delivery(OPKELE_CP_ "retrieve_assoc() has returned expired handle"); const string& sigenc = pin.get_param("openid.sig"); vector<unsigned char> sig; util::decode_base64(sigenc,sig); const string& slist = pin.get_param("openid.signed"); string kv; string::size_type p = 0; while(true) { string::size_type co = slist.find(',',p); string f = (co==string::npos)?slist.substr(p):slist.substr(p,co-p); kv += f; kv += ':'; f.insert(0,"openid."); kv += pin.get_param(f); kv += '\n'; if(ext) ps[f.substr(sizeof("openid.")-1)] = pin.get_param(f); if(co==string::npos) break; p = co+1; } secret_t secret = assoc->secret(); unsigned int md_len = 0; unsigned char *md = HMAC( EVP_sha1(), &(secret.front()),secret.size(), (const unsigned char *)kv.data(),kv.length(), 0,&md_len); if(sig.size()!=md_len || memcmp(&(sig.front()),md,md_len)) throw id_res_mismatch(OPKELE_CP_ "signature mismatch"); - }catch(failed_lookup& e) { /* XXX: more specific? */ + }catch(failed_lookup& e) { const string& slist = pin.get_param("openid.signed"); string::size_type pp = 0; params_t p; while(true) { string::size_type co = slist.find(',',pp); string f = "openid."; f += (co==string::npos)?slist.substr(pp):slist.substr(pp,co-pp); p[f] = pin.get_param(f); if(co==string::npos) break; pp = co+1; } p["openid.assoc_handle"] = pin.get_param("openid.assoc_handle"); p["openid.sig"] = pin.get_param("openid.sig"); p["openid.signed"] = pin.get_param("openid.signed"); try { string ih = pin.get_param("openid.invalidate_handle"); p["openid.invalidate_handle"] = ih; }catch(failed_lookup& fl) { } try { check_authentication(server,p); }catch(failed_check_authentication& fca) { throw id_res_failed(OPKELE_CP_ "failed to check_authentication()"); } } if(ext) ext->id_res_hook(pin,ps,identity); } void consumer_t::check_authentication(const string& server,const params_t& p) { string request = "openid.mode=check_authentication"; for(params_t::const_iterator i=p.begin();i!=p.end();++i) { if(i->first!="openid.mode") { request += '&'; request += i->first; request += '='; request += util::url_encode(i->second); } } curl_pick_t curl = curl_pick_t::easy_init(); if(!curl) throw exception_curl(OPKELE_CP_ "failed to initialize curl"); CURLcode r; (r=curl.misc_sets()) || (r=curl.easy_setopt(CURLOPT_URL,server.c_str())) || (r=curl.easy_setopt(CURLOPT_POST,1)) || (r=curl.easy_setopt(CURLOPT_POSTFIELDS,request.data())) || (r=curl.easy_setopt(CURLOPT_POSTFIELDSIZE,request.length())) || (r=curl.set_write()) ; if(r) throw exception_curl(OPKELE_CP_ "failed to set curly options",r); if( (r=curl.easy_perform()) ) throw exception_curl(OPKELE_CP_ "failed to perform curly request",r); params_t pp; pp.parse_keyvalues(curl.response); if(pp.has_param("invalidate_handle")) invalidate_assoc(server,pp.get_param("invalidate_handle")); if(pp.has_param("is_valid")) { if(pp.get_param("is_valid")=="true") return; }else if(pp.has_param("lifetime")) { if(util::string_to_long(pp.get_param("lifetime"))) return; } throw failed_check_authentication(OPKELE_CP_ "failed to verify response"); |