| -rw-r--r-- | lib/consumer.cc | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/lib/consumer.cc b/lib/consumer.cc index 7f31d52..f72ae08 100644 --- a/lib/consumer.cc +++ b/lib/consumer.cc @@ -1,417 +1,439 @@ #include <algorithm> #include <cassert> #include <opkele/util.h> #include <opkele/exception.h> #include <opkele/data.h> #include <opkele/consumer.h> #include <openssl/sha.h> #include <openssl/hmac.h> #include <curl/curl.h> #include <iostream> #include "config.h" #include <pcre.h> namespace opkele { using namespace std; class pcre_matches_t { public: int *_ov; int _s; pcre_matches_t() : _ov(0), _s(0) { } pcre_matches_t(int s) : _ov(0), _s(s) { if(_s&1) ++_s; _s += _s>>1; _ov = new int[_s]; } ~pcre_matches_t() throw() { if(_ov) delete[] _ov; } int begin(int i) const { return _ov[i<<1]; } int end(int i) const { return _ov[(i<<1)+1]; } int length(int i) const { int t=i<<1; return _ov[t+1]-_ov[t]; } }; class pcre_t { public: pcre *_p; pcre_t() : _p(0) { } pcre_t(pcre *p) : _p(p) { } pcre_t(const char *re,int opts) : _p(0) { static const char *errptr; static int erroffset; _p = pcre_compile(re,opts,&errptr,&erroffset,NULL); if(!_p) throw internal_error(OPKELE_CP_ string("Failed to compile regexp: ")+errptr); } ~pcre_t() throw() { if(_p) (*pcre_free)(_p); } pcre_t& operator=(pcre *p) { if(_p) (*pcre_free)(_p); _p=p; return *this; } operator const pcre*(void) const { return _p; } operator pcre*(void) { return _p; } int exec(const string& s,pcre_matches_t& m) { if(!_p) throw internal_error(OPKELE_CP_ "Trying to execute absent regexp"); return pcre_exec(_p,NULL,s.c_str(),s.length(),0,0,m._ov,m._s); } }; class curl_t { public: CURL *_c; curl_t() : _c(0) { } curl_t(CURL *c) : _c(c) { } ~curl_t() throw() { if(_c) curl_easy_cleanup(_c); } curl_t& operator=(CURL *c) { if(_c) curl_easy_cleanup(_c); _c=c; return *this; } operator const CURL*(void) const { return _c; } operator CURL*(void) { return _c; } }; static CURLcode curl_misc_sets(CURL* c) { CURLcode r; (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)) #ifdef DISABLE_CURL_SSL_VERIFYHOST || (r=curl_easy_setopt(c,CURLOPT_SSL_VERIFYHOST,0)) #endif #ifdef DISABLE_CURL_SSL_VERIFYPEER || (r=curl_easy_setopt(c,CURLOPT_SSL_VERIFYPEER,0)) #endif ; 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)+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"); 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? */ 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_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); static const char *re_bre = "<\\s*body\\b", *re_hdre = "<\\s*head[^>]*>", *re_lre = "<\\s*link\\b([^>]+)>", - *re_rre = "\\brel\\s*=\\s*['\"]\\s*([^'\"\\s]+)\\s*['\"]", + *re_rre = "\\brel\\s*=\\s*['\"]([^'\"]+)['\"]", *re_hre = "\\bhref\\s*=\\s*['\"]\\s*([^'\"\\s]+)\\s*['\"]"; pcre_matches_t m1(3), m2(3); pcre_t bre(re_bre,PCRE_CASELESS); if(bre.exec(html,m1)>0) html.erase(m1.begin(0)); pcre_t hdre(re_hdre,PCRE_CASELESS); if(hdre.exec(html,m1)<=0) throw bad_input(OPKELE_CP_ "failed to find <head>"); html.erase(0,m1.end(0)+1); pcre_t lre(re_lre,PCRE_CASELESS), rre(re_rre,PCRE_CASELESS), hre(re_hre,PCRE_CASELESS); - while(lre.exec(html,m1)>=2) { + bool gotit = false; + while( (!gotit) && lre.exec(html,m1)>=2 ) { + static const char *whitespace = " \t"; string attrs(html,m1.begin(1),m1.length(1)); html.erase(0,m1.end(0)+1); if(!( rre.exec(attrs,m1)>=2 && hre.exec(attrs,m2)>=2 )) continue; - string rel(attrs,m1.begin(1),m1.length(1)); + string rels(attrs,m1.begin(1),m1.length(1)); + for(string::size_type ns = rels.find_first_not_of(whitespace); + ns!=string::npos; + ns=rels.find_first_not_of(whitespace,ns)) { + string::size_type s = rels.find_first_of(whitespace,ns); + string rel; + if(s==string::npos) { + rel.assign(rels,ns,string::npos); + ns=string::npos; + }else{ + rel.assign(rels,ns,s-ns); + ns=s; + } if(rel=="openid.server") { server.assign(attrs,m2.begin(1),m2.length(1)); - if(!delegate.empty()) break; + if(!delegate.empty()) { + gotit = true; + break; + } }else if(rel=="openid.delegate") { delegate.assign(attrs,m2.begin(1),m2.length(1)); - if(!server.empty()) break; + if(!server.empty()) { + gotit = true; + break; + } + } + if(ns==string::npos) 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::normalize(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; } string::size_type qm = rv.find('?',i); string::size_type sl = rv.find('/',i); if(qm!=string::npos) { if(sl==string::npos || sl>qm) rv.insert(qm,1,'/'); }else{ if(sl==string::npos) rv += '/'; } return rv; } string consumer_t::canonicalize(const string& url) { string rv = normalize(url); 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,rv.c_str())) || (r=curl_easy_setopt(curl,CURLOPT_NOBODY,1)) ; if(r) throw exception_curl(OPKELE_CP_ "failed to curl_easy_setopt()",r); r = curl_easy_perform(curl); if(r) throw exception_curl(OPKELE_CP_ "failed to curl_easy_perform()",r); const char *eu = 0; r = curl_easy_getinfo(curl,CURLINFO_EFFECTIVE_URL,&eu); if(r) throw exception_curl(OPKELE_CP_ "failed to curl_easy_getinfo(..CURLINFO_EFFECTIVE_URL..)",r); rv = eu; return normalize(rv); } } |