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#include <algorithm>
#include <cassert>
#include <cstring>
#include <opkele/util.h>
#include <opkele/curl.h>
#include <opkele/exception.h>
#include <opkele/data.h>
#include <opkele/consumer.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <iostream>
#include "config.h"
#include <pcre.h>
namespace opkele {
using namespace std;
using util::curl_t;
using util::curl_pick_t;
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);
}
};
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_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 p; p.parse_keyvalues(curl.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())
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) {
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");
}
void consumer_t::retrieve_links(const string& url,string& server,string& delegate) {
server.erase();
delegate.erase();
curl_pick_t curl = curl_pick_t::easy_init();
if(!curl)
throw exception_curl(OPKELE_CP_ "failed to initialize curl");
string& html = curl.response;
CURLcode r;
(r=curl.misc_sets())
|| (r=curl.easy_setopt(CURLOPT_URL,url.c_str()))
|| (r=curl.set_write());
;
if(r)
throw exception_curl(OPKELE_CP_ "failed to set curly options",r);
r = curl.easy_perform();
if(r && r!=CURLE_WRITE_ERROR)
throw exception_curl(OPKELE_CP_ "failed to perform curly request",r);
static const char *re_bre = "<\\s*body\\b", *re_hdre = "<\\s*head[^>]*>",
*re_lre = "<\\s*link\\b([^>]+)>",
*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);
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 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()) {
gotit = true;
break;
}
}else if(rel=="openid.delegate") {
delegate.assign(attrs,m2.begin(1),m2.length(1));
if(!server.empty()) {
gotit = true;
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_t::easy_init();
if(!curl)
throw exception_curl(OPKELE_CP_ "failed to initialize curl()");
string html;
CURLcode r;
(r=curl.misc_sets())
|| (r=curl.easy_setopt(CURLOPT_URL,rv.c_str()))
|| (r=curl.easy_setopt(CURLOPT_NOBODY,1))
;
if(r)
throw exception_curl(OPKELE_CP_ "failed to set curly options",r);
r = curl.easy_perform();
if(r)
throw exception_curl(OPKELE_CP_ "failed to perform curly request",r);
const char *eu = 0;
r = curl.easy_getinfo(CURLINFO_EFFECTIVE_URL,&eu);
if(r)
throw exception_curl(OPKELE_CP_ "failed to get CURLINFO_EFFECTIVE_URL",r);
rv = eu;
return normalize(rv);
}
}
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