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path: root/lib
authorMichael Krelin <hacker@klever.net>2005-07-19 13:08:32 (UTC)
committer Michael Krelin <hacker@klever.net>2005-07-19 13:08:32 (UTC)
commit4c82851dd5d5644a89d4f269079bf901f763ee33 (patch) (side-by-side diff)
treeb64c8b3c9a1be88e2a9c3f762272e0b4509ba7d9 /lib
parent907343b0c973eb295bec8795902a6d49744e9174 (diff)
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initial commit of libopkele - OpenID support library
Diffstat (limited to 'lib') (more/less context) (ignore whitespace changes)
-rw-r--r--lib/.gitignore7
-rw-r--r--lib/Makefile.am24
-rw-r--r--lib/consumer.cc316
-rw-r--r--lib/data.cc11
-rw-r--r--lib/exception.cc22
-rw-r--r--lib/params.cc96
-rw-r--r--lib/secret.cc61
-rw-r--r--lib/server.cc169
-rw-r--r--lib/util.cc138
9 files changed, 844 insertions, 0 deletions
diff --git a/lib/.gitignore b/lib/.gitignore
new file mode 100644
index 0000000..2325be6
--- a/dev/null
+++ b/lib/.gitignore
@@ -0,0 +1,7 @@
+*.lo
+*.o
+Makefile.in
+libopkele.la
+.libs
+.deps
+Makefile
diff --git a/lib/Makefile.am b/lib/Makefile.am
new file mode 100644
index 0000000..6f3f9f3
--- a/dev/null
+++ b/lib/Makefile.am
@@ -0,0 +1,24 @@
+lib_LTLIBRARIES = libopkele.la
+
+INCLUDES = \
+ -I${top_srcdir}/include/ \
+ ${KONFORKA_CFLAGS} \
+ ${OPENSSL_CFLAGS} \
+ ${MIMETIC_CFLAGS} \
+ ${LIBCURL_CPPFLAGS} \
+ ${PCREPP_CFLAGS}
+LDADD = \
+ ${LIBCURL} \
+ ${PCREPP_LIBS} \
+ ${MIMETIC_LIBS} \
+ ${OPENSSL_LIBS} \
+ ${KONFORKA_LIBS}
+
+libopkele_la_SOURCES = \
+ params.cc \
+ util.cc \
+ server.cc \
+ secret.cc \
+ data.cc \
+ consumer.cc \
+ exception.cc
diff --git a/lib/consumer.cc b/lib/consumer.cc
new file mode 100644
index 0000000..bd76b61
--- a/dev/null
+++ b/lib/consumer.cc
@@ -0,0 +1,316 @@
+#include <algorithm>
+#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 <mimetic/mimetic.h>
+#include <curl/curl.h>
+#include <pcre++.h>
+
+#include <iostream>
+
+/* silly mimetic */
+#undef PACKAGE
+#undef PACKAGE_BUGREPORT
+#undef PACKAGE_NAME
+#undef PACKAGE_STRING
+#undef PACKAGE_TARNAME
+#undef PACKAGE_VERSION
+#undef VERSION
+
+#include "config.h"
+
+namespace opkele {
+ using namespace std;
+
+ 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))
+ ;
+ 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 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);
+ 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");
+ }
+
+}
diff --git a/lib/data.cc b/lib/data.cc
new file mode 100644
index 0000000..c040430
--- a/dev/null
+++ b/lib/data.cc
@@ -0,0 +1,11 @@
+#include <opkele/data.h>
+
+namespace opkele {
+
+ namespace data {
+
+ const char *_default_p = "155172898181473697471232257763715539915724801966915404479707795314057629378541917580651227423698188993727816152646631438561595825688188889951272158842675419950341258706556549803580104870537681476726513255747040765857479291291572334510643245094715007229621094194349783925984760375594985848253359305585439638443";
+ const char *_default_g = "2";
+
+ }
+}
diff --git a/lib/exception.cc b/lib/exception.cc
new file mode 100644
index 0000000..b7c1702
--- a/dev/null
+++ b/lib/exception.cc
@@ -0,0 +1,22 @@
+#include <openssl/err.h>
+#include <curl/curl.h>
+#include <opkele/exception.h>
+
+namespace opkele {
+
+ exception_openssl::exception_openssl(OPKELE_E_PARS)
+ : _error(ERR_peek_last_error()),
+ _ssl_string(ERR_error_string(_error,0)),
+ exception(OPKELE_E_CONS_ w+" ["+_ssl_string+']') {
+ }
+
+ exception_curl::exception_curl(OPKELE_E_PARS)
+ : _error(CURLE_OK),
+ exception_network(OPKELE_E_CONS) { }
+ exception_curl::exception_curl(OPKELE_E_PARS,CURLcode e)
+ : _error(e),
+ _curl_string(curl_easy_strerror(e)),
+ exception_network(OPKELE_E_CONS_ w+" ["+_curl_string+']') {
+ }
+
+}
diff --git a/lib/params.cc b/lib/params.cc
new file mode 100644
index 0000000..14f1a53
--- a/dev/null
+++ b/lib/params.cc
@@ -0,0 +1,96 @@
+#include <opkele/types.h>
+#include <opkele/exception.h>
+#include <opkele/util.h>
+#include <openssl/sha.h>
+#include <openssl/hmac.h>
+#include <mimetic/mimetic.h>
+
+namespace opkele {
+ using namespace std;
+
+ bool params_t::has_param(const string& n) const {
+ return find(n)!=end();
+ }
+ const string& params_t::get_param(const string& n) const {
+ const_iterator i = find(n);
+ if(i==end())
+ throw failed_lookup(OPKELE_CP_ n+": no such parameter");
+ return i->second;
+ }
+ string& params_t::get_param(const string& n) {
+ iterator i = find(n);
+ if(i==end())
+ throw failed_lookup(OPKELE_CP_ n+": no such parameter");
+ return i->second;
+ }
+
+ void params_t::parse_keyvalues(const string& kv) {
+ clear();
+ string::size_type p = 0;
+ while(true) {
+ string::size_type co = kv.find(':',p);
+ if(co==string::npos)
+ break;
+ string::size_type nl = kv.find('\n',co+1);
+ if(nl==string::npos)
+ throw bad_input(OPKELE_CP_ "malformed input");
+ insert(value_type(kv.substr(p,co-p),kv.substr(co+1,nl-co-1)));
+ p = nl+1;
+ }
+ }
+
+ void params_t::sign(secret_t secret,string& sig,const string& slist,const char *prefix) const {
+ 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 += ':';
+ if(prefix) f.insert(0,prefix);
+ kv += get_param(f);
+ kv += '\n';
+ if(co==string::npos)
+ break;
+ p = co+1;
+ }
+ 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);
+ mimetic::Base64::Encoder b(0);
+ sig.erase();
+ mimetic::encode(
+ md,md+md_len, b,
+ back_insert_iterator<string>(sig) );
+ }
+
+ string params_t::append_query(const string& url,const char *prefix) const {
+ string rv = url;
+ bool p = true;
+ if(rv.find('?')==string::npos) {
+ rv += '?';
+ p = false;
+ }
+ for(const_iterator i=begin();i!=end();++i) {
+ if(p)
+ rv += '&';
+ else
+ p = true;
+ rv += prefix;
+ rv += i->first;
+ rv += '=';
+ rv += util::url_encode(i->second);
+ }
+ return rv;
+ }
+
+ ostream& operator << (ostream& o,const params_t& p) {
+ for(params_t::const_iterator i=p.begin();i!=p.end();++i)
+ o << i->first << ':' << i->second << '\n';
+ return o;
+ }
+
+}
diff --git a/lib/secret.cc b/lib/secret.cc
new file mode 100644
index 0000000..ae8a3c5
--- a/dev/null
+++ b/lib/secret.cc
@@ -0,0 +1,61 @@
+#include <algorithm>
+#include <functional>
+#include <opkele/types.h>
+#include <opkele/exception.h>
+#include <mimetic/mimetic.h>
+
+namespace opkele {
+ using namespace std;
+
+ template<class __a1,class __a2,class __r>
+ struct bitwise_xor : public binary_function<__a1,__a2,__r> {
+ __r operator() (const __a1& a1,const __a2& a2) const {
+ return a1^a2;
+ }
+ };
+
+ void secret_t::enxor_to_base64(const unsigned char *key_sha1,string& rv) const {
+ if(size()!=20)
+ throw bad_input(OPKELE_CP_ "wrong secret size");
+ vector<unsigned char> tmp;
+ transform(
+ begin(), end(),
+ key_sha1,
+ back_insert_iterator<vector<unsigned char> >(tmp),
+ bitwise_xor<unsigned char,unsigned char,unsigned char>() );
+ mimetic::Base64::Encoder b(0);
+ mimetic::encode(
+ tmp.begin(),tmp.end(), b,
+ back_insert_iterator<string>(rv) );
+ }
+
+ void secret_t::enxor_from_base64(const unsigned char *key_sha1,const string& b64) {
+ mimetic::Base64::Decoder b;
+ clear();
+ mimetic::decode(
+ b64.begin(),b64.end(), b,
+ back_insert_iterator<secret_t>(*this) );
+ transform(
+ begin(), end(),
+ key_sha1,
+ begin(),
+ bitwise_xor<unsigned char,unsigned char,unsigned char>() );
+ }
+
+ void secret_t::to_base64(string& rv) const {
+ if(size()!=20)
+ throw bad_input(OPKELE_CP_ "wrong secret size");
+ mimetic::Base64::Encoder b(0);
+ mimetic::encode(
+ begin(),end(), b,
+ back_insert_iterator<string>(rv) );
+ }
+
+ void secret_t::from_base64(const string& b64) {
+ mimetic::Base64::Decoder b;
+ mimetic::decode(
+ b64.begin(),b64.end(), b,
+ back_insert_iterator<secret_t>(*this) );
+ }
+
+}
diff --git a/lib/server.cc b/lib/server.cc
new file mode 100644
index 0000000..51d4554
--- a/dev/null
+++ b/lib/server.cc
@@ -0,0 +1,169 @@
+#include <vector>
+#include <openssl/sha.h>
+#include <openssl/hmac.h>
+#include <mimetic/mimetic.h>
+#include <opkele/util.h>
+#include <opkele/exception.h>
+#include <opkele/server.h>
+#include <opkele/data.h>
+
+namespace opkele {
+ using namespace std;
+
+ void server_t::associate(const params_t& pin,params_t& pout) {
+ util::dh_t dh;
+ util::bignum_t c_pub;
+ unsigned char key_sha1[SHA_DIGEST_LENGTH];
+ enum {
+ sess_cleartext,
+ sess_dh_sha1
+ } st = sess_cleartext;
+ if(
+ pin.has_param("openid.session_type")
+ && pin.get_param("openid.session_type")=="DH-SHA1" ) {
+ /* TODO: fallback to cleartext in case of exceptions here? */
+ if(!(dh = DH_new()))
+ throw exception_openssl(OPKELE_CP_ "failed to DH_new()");
+ c_pub = util::base64_to_bignum(pin.get_param("openid.dh_consumer_public"));
+ if(pin.has_param("openid.dh_modulus"))
+ dh->p = util::base64_to_bignum(pin.get_param("openid.dh_modulus"));
+ else
+ dh->p = util::dec_to_bignum(data::_default_p);
+ if(pin.has_param("openid.dh_gen"))
+ dh->g = util::base64_to_bignum(pin.get_param("openid.dh_gen"));
+ else
+ dh->g = util::dec_to_bignum(data::_default_g);
+ if(!DH_generate_key(dh))
+ throw exception_openssl(OPKELE_CP_ "failed to DH_generate_key()");
+ vector<unsigned char> ck(DH_size(dh));
+ int cklen = DH_compute_key(&(ck.front()),c_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);
+ SHA1(&(ck.front()),ck.size(),key_sha1);
+ st = sess_dh_sha1;
+ }
+ assoc_t assoc = alloc_assoc(mode_associate);
+ time_t now = time(0);
+ pout.clear();
+ pout["assoc_type"] = assoc->assoc_type();
+ pout["assoc_handle"] = assoc->handle();
+ /* TODO: eventually remove deprecated stuff */
+ pout["issued"] = util::time_to_w3c(now);
+ pout["expiry"] = util::time_to_w3c(now+assoc->expires_in());
+ pout["expires_in"] = util::long_to_string(assoc->expires_in());
+ secret_t secret = assoc->secret();
+ switch(st) {
+ case sess_dh_sha1:
+ pout["session_type"] = "DH-SHA1";
+ pout["dh_server_public"] = util::bignum_to_base64(dh->pub_key);
+ secret.enxor_to_base64(key_sha1,pout["enc_mac_key"]);
+ break;
+ default:
+ secret.to_base64(pout["mac_key"]);
+ break;
+ }
+ }
+
+ void server_t::checkid_immediate(const params_t& pin,string& return_to,params_t& pout) {
+ checkid_(mode_checkid_immediate,pin,return_to,pout);
+ }
+
+ void server_t::checkid_setup(const params_t& pin,string& return_to,params_t& pout) {
+ checkid_(mode_checkid_setup,pin,return_to,pout);
+ }
+
+ void server_t::checkid_(mode_t mode,const params_t& pin,string& return_to,params_t& pout) {
+ if(mode!=mode_checkid_immediate && mode!=mode_checkid_setup)
+ throw bad_input(OPKELE_CP_ "invalid checkid_* mode");
+ assoc_t assoc;
+ try {
+ assoc = retrieve_assoc(pin.get_param("openid.assoc_handle"));
+ }catch(failed_lookup& fl) {
+ // no handle specified or no valid handle found, going dumb
+ assoc = alloc_assoc(mode_checkid_setup);
+ }
+ string trust_root;
+ try {
+ trust_root = pin.get_param("openid.trust_root");
+ }catch(failed_lookup& fl) { }
+ string identity = pin.get_param("openid.identity");
+ return_to = pin.get_param("openid.return_to");
+ validate(*assoc,pin,identity,trust_root);
+ pout.clear();
+ pout["mode"] = "id_res";
+ pout["assoc_handle"] = assoc->handle();
+ if(pin.has_param("openid.assoc_handle") && assoc->stateless())
+ pout["invalidate_handle"] = pin.get_param("openid.assoc_handle");
+ pout["identity"] = identity;
+ pout["return_to"] = return_to;
+ /* TODO: eventually remove deprecated stuff */
+ time_t now = time(0);
+ pout["issued"] = util::time_to_w3c(now);
+ pout["valid_to"] = util::time_to_w3c(now+120);
+ pout["exipres_in"] = "120";
+ pout.sign(assoc->secret(),pout["sig"],pout["signed"]="mode,identity,return_to");
+ }
+
+ void server_t::check_authentication(const params_t& pin,params_t& pout) {
+ vector<unsigned char> sig;
+ mimetic::Base64::Decoder b;
+ const string& sigenc = pin.get_param("openid.sig");
+ mimetic::decode(
+ sigenc.begin(),sigenc.end(), b,
+ back_insert_iterator<vector<unsigned char> >(sig));
+ assoc_t assoc;
+ try {
+ assoc = retrieve_assoc(pin.get_param("openid.assoc_handle"));
+ }catch(failed_lookup& fl) {
+ throw failed_assertion(OPKELE_CP_ "invalid handle or handle not specified");
+ }
+ if(!assoc->stateless())
+ throw stateful_handle(OPKELE_CP_ "will not do check_authentication on a stateful handle");
+ 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 += ':';
+ if(f=="mode")
+ kv += "id_res";
+ else {
+ 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);
+ pout.clear();
+ if(sig.size()==md_len && !memcmp(&(sig.front()),md,md_len)) {
+ pout["is_valid"]="true";
+ pout["lifetime"]="60"; /* TODO: eventually remove deprecated stuff */
+ }else{
+ pout["is_valid"]="false";
+ pout["lifetime"]="0"; /* TODO: eventually remove deprecated stuff */
+ }
+ if(pin.has_param("openid.invalidate_handle")) {
+ string h = pin.get_param("openid.invalidate_handle");
+ try {
+ assoc_t assoc = retrieve_assoc(h);
+ }catch(invalid_handle& ih) {
+ pout["invalidate_handle"] = h;
+ }catch(failed_lookup& fl) { }
+ }
+ }
+
+}
diff --git a/lib/util.cc b/lib/util.cc
new file mode 100644
index 0000000..1e7335c
--- a/dev/null
+++ b/lib/util.cc
@@ -0,0 +1,138 @@
+#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;
+ }
+
+ }
+
+}