-rw-r--r-- | include/opkele/consumer.h | 2 | ||||
-rw-r--r-- | include/opkele/util.h | 1 | ||||
-rw-r--r-- | lib/consumer.cc | 29 | ||||
-rw-r--r-- | lib/util.cc | 25 |
4 files changed, 29 insertions, 28 deletions
diff --git a/include/opkele/consumer.h b/include/opkele/consumer.h index b9c29bd..3c0ed5f 100644 --- a/include/opkele/consumer.h +++ b/include/opkele/consumer.h @@ -35,101 +35,103 @@ namespace opkele { * store. * @param server the OpenID server * @param handle association handle * @return the autho_ptr<> for the newly allocated association_t object * @throw failed_lookup in case of error */ 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. * @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 * @return the location string * @throw exception in case of error */ string checkid_immediate(const string& identity,const string& return_to,const string& trust_root=""); /** * 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 * @return the location string * @throw exception in case of error */ string checkid_setup(const string& identity,const string& return_to,const string& trust_root=""); /** * 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 * @return the location string * @throw exception in case of error */ string checkid_(mode_t mode,const string& identity,const string& return_to,const string& trust_root=""); /** * verify the id_res response * @param pin the response parameters * @param identity the identity being checked (if not specified, 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 exception in case of other failures */ void id_res(const params_t& pin,const string& identity=""); /** * perform a check_authentication request. * @param server the OpenID server * @param p request parameters */ void check_authentication(const string& server,const params_t& p); + static string canonicalize(const string& url); + }; } #endif /* __OPKELE_CONSUMER_H */ diff --git a/include/opkele/util.h b/include/opkele/util.h index fbbef93..5372498 100644 --- a/include/opkele/util.h +++ b/include/opkele/util.h @@ -1,60 +1,59 @@ #ifndef __OPKELE_UTIL_H #define __OPKELE_UTIL_H #include <time.h> #include <string> #include <openssl/bn.h> #include <openssl/dh.h> namespace opkele { using std::string; namespace util { class bignum_t { public: BIGNUM *_bn; bignum_t() : _bn(0) { } bignum_t(BIGNUM *bn) : _bn(bn) { } ~bignum_t() throw() { if(_bn) BN_free(_bn); } bignum_t& operator=(BIGNUM *bn) { if(_bn) BN_free(_bn); _bn = bn; return *this; } operator const BIGNUM*(void) const { return _bn; } operator BIGNUM*(void) { return _bn; } }; class dh_t { public: DH *_dh; dh_t() : _dh(0) { } dh_t(DH *dh) : _dh(dh) { } ~dh_t() throw() { if(_dh) DH_free(_dh); } dh_t& operator=(DH *dh) { if(_dh) DH_free(_dh); _dh = dh; return *this; } operator const DH*(void) const { return _dh; } operator DH*(void) { return _dh; } DH* operator->() { return _dh; } const DH* operator->() const { return _dh; } }; BIGNUM *base64_to_bignum(const string& b64); BIGNUM *dec_to_bignum(const string& dec); string bignum_to_base64(const BIGNUM *bn); string time_to_w3c(time_t t); time_t w3c_to_time(const string& w); - string canonicalize_url(const string& url); string url_encode(const string& str); string long_to_string(long l); long string_to_long(const string& s); } } #endif /* __OPKELE_UTIL_H */ diff --git a/lib/consumer.cc b/lib/consumer.cc index bd76b61..cbe0769 100644 --- a/lib/consumer.cc +++ b/lib/consumer.cc @@ -44,273 +44,298 @@ namespace opkele { (r=curl_easy_setopt(c,CURLOPT_FOLLOWLOCATION,1)) || (r=curl_easy_setopt(c,CURLOPT_MAXREDIRS,5)) || (r=curl_easy_setopt(c,CURLOPT_DNS_CACHE_TIMEOUT,120)) || (r=curl_easy_setopt(c,CURLOPT_DNS_USE_GLOBAL_CACHE,1)) || (r=curl_easy_setopt(c,CURLOPT_USERAGENT,PACKAGE_NAME"/"PACKAGE_VERSION)) || (r=curl_easy_setopt(c,CURLOPT_TIMEOUT,20)) ; return r; } static size_t _curl_tostring(void *ptr,size_t size,size_t nmemb,void *stream) { string *str = (string*)stream; size_t bytes = size*nmemb; size_t get = min(16384-str->length(),bytes); str->append((const char*)ptr,get); return get; } assoc_t consumer_t::associate(const string& server) { util::dh_t dh = DH_new(); if(!dh) throw exception_openssl(OPKELE_CP_ "failed to DH_new()"); dh->p = util::dec_to_bignum(data::_default_p); dh->g = util::dec_to_bignum(data::_default_g); if(!DH_generate_key(dh)) throw exception_openssl(OPKELE_CP_ "failed to DH_generate_key()"); string request = "openid.mode=associate" "&openid.assoc_type=HMAC-SHA1" "&openid.session_type=DH-SHA1" "&openid.dh_consumer_public="; request += util::url_encode(util::bignum_to_base64(dh->pub_key)); curl_t curl = curl_easy_init(); if(!curl) throw exception_curl(OPKELE_CP_ "failed to curl_easy_init()"); string response; CURLcode r; (r=curl_misc_sets(curl)) || (r=curl_easy_setopt(curl,CURLOPT_URL,server.c_str())) || (r=curl_easy_setopt(curl,CURLOPT_POST,1)) || (r=curl_easy_setopt(curl,CURLOPT_POSTFIELDS,request.data())) || (r=curl_easy_setopt(curl,CURLOPT_POSTFIELDSIZE,request.length())) || (r=curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,_curl_tostring)) || (r=curl_easy_setopt(curl,CURLOPT_WRITEDATA,&response)) ; if(r) throw exception_curl(OPKELE_CP_ "failed to curl_easy_setopt()",r); if(r=curl_easy_perform(curl)) throw exception_curl(OPKELE_CP_ "failed to curl_easy_perform()",r); params_t p; p.parse_keyvalues(response); if(p.has_param("assoc_type") && p.get_param("assoc_type")!="HMAC-SHA1") throw bad_input(OPKELE_CP_ "unsupported assoc_type"); string st; if(p.has_param("session_type")) st = p.get_param("session_type"); if((!st.empty()) && st!="DH-SHA1") throw bad_input(OPKELE_CP_ "unsupported session_type"); secret_t secret; if(st.empty()) { secret.from_base64(p.get_param("mac_key")); }else{ util::bignum_t s_pub = util::base64_to_bignum(p.get_param("dh_server_public")); vector<unsigned char> ck(DH_size(dh)); int cklen = DH_compute_key(&(ck.front()),s_pub,dh); if(cklen<0) throw exception_openssl(OPKELE_CP_ "failed to DH_compute_key()"); ck.resize(cklen); // OpenID algorithm requires extra zero in case of set bit here if(ck[0]&0x80) ck.insert(ck.begin(),1,0); unsigned char key_sha1[SHA_DIGEST_LENGTH]; SHA1(&(ck.front()),ck.size(),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) { return checkid_(mode_checkid_immediate,identity,return_to,trust_root); } string consumer_t::checkid_setup(const string& identity,const string& return_to,const string& trust_root) { return checkid_(mode_checkid_setup,identity,return_to,trust_root); } string consumer_t::checkid_(mode_t mode,const string& identity,const string& return_to,const string& trust_root) { 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 = util::canonicalize_url(identity); + 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 { try { string ah = find_assoc(server)->handle(); p["assoc_handle"] = ah; }catch(failed_lookup& fl) { string ah = associate(server)->handle(); p["assoc_handle"] = ah; } }catch(exception& e) { } return p.append_query(server); } void consumer_t::id_res(const params_t& pin,const string& identity) { 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"):util::canonicalize_url(identity),server,delegate); + retrieve_links(identity.empty()?pin.get_param("openid.identity"):canonicalize(identity),server,delegate); try { assoc_t assoc = retrieve_assoc(server,pin.get_param("openid.assoc_handle")); const string& sigenc = pin.get_param("openid.sig"); mimetic::Base64::Decoder b; vector<unsigned char> sig; mimetic::decode( sigenc.begin(),sigenc.end(), b, back_insert_iterator<vector<unsigned char> >(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(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? */ 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()"); } } } 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_t curl = curl_easy_init(); if(!curl) throw exception_curl(OPKELE_CP_ "failed to curl_easy_init()"); string response; CURLcode r; (r=curl_misc_sets(curl)) || (r=curl_easy_setopt(curl,CURLOPT_URL,server.c_str())) || (r=curl_easy_setopt(curl,CURLOPT_POST,1)) || (r=curl_easy_setopt(curl,CURLOPT_POSTFIELDS,request.data())) || (r=curl_easy_setopt(curl,CURLOPT_POSTFIELDSIZE,request.length())) || (r=curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,_curl_tostring)) || (r=curl_easy_setopt(curl,CURLOPT_WRITEDATA,&response)) ; if(r) throw exception_curl(OPKELE_CP_ "failed to curl_easy_setopt()",r); if(r=curl_easy_perform(curl)) throw exception_curl(OPKELE_CP_ "failed to curl_easy_perform()",r); params_t pp; pp.parse_keyvalues(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"); } void consumer_t::retrieve_links(const string& url,string& server,string& delegate) { server.erase(); delegate.erase(); curl_t curl = curl_easy_init(); if(!curl) throw exception_curl(OPKELE_CP_ "failed to curl_easy_init()"); string html; CURLcode r; (r=curl_misc_sets(curl)) || (r=curl_easy_setopt(curl,CURLOPT_URL,url.c_str())) || (r=curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,_curl_tostring)) || (r=curl_easy_setopt(curl,CURLOPT_WRITEDATA,&html)) ; if(r) throw exception_curl(OPKELE_CP_ "failed to curl_easy_setopt()",r); r = curl_easy_perform(curl); if(r && r!=CURLE_WRITE_ERROR) throw exception_curl(OPKELE_CP_ "failed to curl_easy_perform()",r); pcrepp::Pcre bre("<body\\b",PCRE_CASELESS); // strip out everything past body if(bre.search(html)) html.erase(bre.get_match_start()); pcrepp::Pcre hdre("<head[^>]*>",PCRE_CASELESS); if(!hdre.search(html)) throw bad_input(OPKELE_CP_ "failed to find head"); html.erase(0,hdre.get_match_end()+1); pcrepp::Pcre lre("<link\\b([^>]+)>",PCRE_CASELESS), rre("\\brel=['\"]([^'\"]+)['\"]",PCRE_CASELESS), hre("\\bhref=['\"]([^'\"]+)['\"]",PCRE_CASELESS); while(lre.search(html)) { string attrs = lre[0]; html.erase(0,lre.get_match_end()+1); if(!(rre.search(attrs)&&hre.search(attrs))) continue; if(rre[0]=="openid.server") { server = hre[0]; if(!delegate.empty()) break; }else if(rre[0]=="openid.delegate") { delegate = hre[0]; if(!server.empty()) break; } } if(server.empty()) throw failed_assertion(OPKELE_CP_ "The location has no openid.server declaration"); } assoc_t consumer_t::find_assoc(const string& server) { throw failed_lookup(OPKELE_CP_ "no find_assoc() provided"); } + string consumer_t::canonicalize(const string& url) { + string rv = url; + // strip leading and trailing spaces + string::size_type i = rv.find_first_not_of(" \t\r\n"); + if(i==string::npos) + throw bad_input(OPKELE_CP_ "empty URL"); + if(i) + rv.erase(0,i); + i = rv.find_last_not_of(" \t\r\n"); + assert(i!=string::npos); + if(i<(rv.length()-1)) + rv.erase(i+1); + // add missing http:// + i = rv.find("://"); + if(i==string::npos) { // primitive. but do we need more? + rv.insert(0,"http://"); + i = sizeof("http://")-1; + }else{ + i += sizeof("://")-1; + } + if(rv.find('/',i)==string::npos) + rv += '/'; + return rv; + } + } diff --git a/lib/util.cc b/lib/util.cc index 1e7335c..d78b5e0 100644 --- a/lib/util.cc +++ b/lib/util.cc @@ -1,138 +1,113 @@ #include <errno.h> #include <cassert> #include <vector> #include <string> #include <mimetic/mimetic.h> #include <curl/curl.h> #include "opkele/util.h" #include "opkele/exception.h" namespace opkele { using namespace std; namespace util { /* * big numerics */ BIGNUM *base64_to_bignum(const string& b64) { vector<unsigned char> bin; mimetic::Base64::Decoder b; mimetic::decode( b64.begin(),b64.end(), b, back_insert_iterator<vector<unsigned char> >(bin) ); BIGNUM *rv = BN_bin2bn(&(bin.front()),bin.size(),0); if(!rv) throw failed_conversion(OPKELE_CP_ "failed to BN_bin2bn()"); return rv; } BIGNUM *dec_to_bignum(const string& dec) { BIGNUM *rv = 0; if(!BN_dec2bn(&rv,dec.c_str())) throw failed_conversion(OPKELE_CP_ "failed to BN_dec2bn()"); return rv; } string bignum_to_base64(const BIGNUM *bn) { vector<unsigned char> bin(BN_num_bytes(bn)); int l = BN_bn2bin(bn,&(bin.front())); string rv; mimetic::Base64::Encoder b(0); mimetic::encode( bin.begin(),bin.begin()+l, b, back_insert_iterator<string>(rv) ); return rv; } /* * w3c times */ string time_to_w3c(time_t t) { struct tm tm_t; if(!gmtime_r(&t,&tm_t)) throw failed_conversion(OPKELE_CP_ "failed to BN_dec2bn()"); char rv[25]; if(!strftime(rv,sizeof(rv)-1,"%Y-%m-%dT%H:%M:%SZ",&tm_t)) throw failed_conversion(OPKELE_CP_ "failed to strftime()"); return rv; } time_t w3c_to_time(const string& w) { struct tm tm_t; memset(&tm_t,0,sizeof(tm_t)); if( sscanf( w.c_str(), "%04d-%02d-%02dT%02d:%02d:%02dZ", &tm_t.tm_year,&tm_t.tm_mon,&tm_t.tm_mday, &tm_t.tm_hour,&tm_t.tm_min,&tm_t.tm_sec ) != 6 ) throw failed_conversion(OPKELE_CP_ "failed to sscanf()"); tm_t.tm_mon--; tm_t.tm_year-=1900; time_t rv = mktime(&tm_t); if(rv==(time_t)-1) throw failed_conversion(OPKELE_CP_ "failed to mktime()"); return rv; } /* * */ - string canonicalize_url(const string& url) { - string rv = url; - // strip leading and trailing spaces - string::size_type i = rv.find_first_not_of(" \t\r\n"); - if(i==string::npos) - throw bad_input(OPKELE_CP_ "empty URL"); - if(i) - rv.erase(0,i); - i = rv.find_last_not_of(" \t\r\n"); - assert(i!=string::npos); - if(i<(rv.length()-1)) - rv.erase(i+1); - // add missing http:// - i = rv.find("://"); - if(i==string::npos) { // primitive. but do we need more? - rv.insert(0,"http://"); - i = sizeof("http://")-1; - }else{ - i += sizeof("://")-1; - } - if(rv.find('/',i)==string::npos) - rv += '/'; - return rv; - } - string url_encode(const string& str) { char * t = curl_escape(str.c_str(),str.length()); if(!t) throw failed_conversion(OPKELE_CP_ "failed to curl_escape()"); string rv(t); curl_free(t); return rv; } string long_to_string(long l) { char rv[32]; int r=snprintf(rv,sizeof(rv),"%ld",l); if(r<0 || r>=sizeof(rv)) throw failed_conversion(OPKELE_CP_ "failed to snprintf()"); return rv; } long string_to_long(const string& s) { char *endptr = 0; long rv = strtol(s.c_str(),&endptr,10); if((!endptr) || endptr==s.c_str()) throw failed_conversion(OPKELE_CP_ "failed to strtol()"); return rv; } } } |