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-rw-r--r--lib/util.cc71
1 files changed, 69 insertions, 2 deletions
diff --git a/lib/util.cc b/lib/util.cc
index a9b9bed..54d6535 100644
--- a/lib/util.cc
+++ b/lib/util.cc
@@ -1,316 +1,383 @@
#include <errno.h>
#include <cassert>
#include <cctype>
#include <cstring>
#include <vector>
#include <string>
#include <stack>
#include <openssl/bio.h>
#include <openssl/evp.h>
+#include <openssl/hmac.h>
#include <curl/curl.h>
#include "opkele/util.h"
#include "opkele/exception.h"
+#include <config.h>
+#ifdef HAVE_DEMANGLE
+# include <cxxabi.h>
+#endif
+
namespace opkele {
using namespace std;
namespace util {
/*
* base64
*/
string encode_base64(const void *data,size_t length) {
BIO *b64 = 0, *bmem = 0;
try {
b64 = BIO_new(BIO_f_base64());
if(!b64)
throw exception_openssl(OPKELE_CP_ "failed to BIO_new() base64 encoder");
BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
bmem = BIO_new(BIO_s_mem());
BIO_set_flags(b64,BIO_CLOSE);
if(!bmem)
throw exception_openssl(OPKELE_CP_ "failed to BIO_new() memory buffer");
BIO_push(b64,bmem);
if(((size_t)BIO_write(b64,data,length))!=length)
throw exception_openssl(OPKELE_CP_ "failed to BIO_write()");
if(BIO_flush(b64)!=1)
throw exception_openssl(OPKELE_CP_ "failed to BIO_flush()");
char *rvd;
long rvl = BIO_get_mem_data(bmem,&rvd);
string rv(rvd,rvl);
BIO_free_all(b64);
return rv;
}catch(...) {
if(b64) BIO_free_all(b64);
throw;
}
}
void decode_base64(const string& data,vector<unsigned char>& rv) {
BIO *b64 = 0, *bmem = 0;
rv.clear();
try {
bmem = BIO_new_mem_buf((void*)data.data(),data.size());
if(!bmem)
throw exception_openssl(OPKELE_CP_ "failed to BIO_new_mem_buf()");
b64 = BIO_new(BIO_f_base64());
if(!b64)
throw exception_openssl(OPKELE_CP_ "failed to BIO_new() base64 decoder");
BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
BIO_push(b64,bmem);
unsigned char tmp[512];
size_t rb = 0;
while((rb=BIO_read(b64,tmp,sizeof(tmp)))>0)
rv.insert(rv.end(),tmp,&tmp[rb]);
BIO_free_all(b64);
}catch(...) {
if(b64) BIO_free_all(b64);
throw;
}
}
/*
* big numerics
*/
BIGNUM *base64_to_bignum(const string& b64) {
vector<unsigned char> bin;
decode_base64(b64,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)+1);
unsigned char *binptr = &(bin.front())+1;
int l = BN_bn2bin(bn,binptr);
if(l && (*binptr)&0x80){
(*(--binptr)) = 0; ++l;
}
return encode_base64(binptr,l);
}
/*
* 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) {
int fraction;
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
) && (
sscanf(
w.c_str(),
"%04d-%02d-%02dT%02d:%02d:%02d.%03dZ",
&tm_t.tm_year,&tm_t.tm_mon,&tm_t.tm_mday,
&tm_t.tm_hour,&tm_t.tm_min,&tm_t.tm_sec,
&fraction
) != 7
) )
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-timezone;
}
/*
*
*/
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>=(int)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;
}
/*
* Normalize URL according to the rules, described in rfc 3986, section 6
*
* - uppercase hex triplets (e.g. %ab -> %AB)
* - lowercase scheme and host
* - decode %-encoded characters, specified as unreserved in rfc 3986, section 2.3,
* that is - [:alpha:][:digit:]._~-
* - remove dot segments
* - remove empty and default ports
* - if there's no path component, add '/'
*/
string rfc_3986_normalize_uri(const string& uri) {
static const char *whitespace = " \t\r\n";
string rv;
string::size_type ns = uri.find_first_not_of(whitespace);
if(ns==string::npos)
throw bad_input(OPKELE_CP_ "Can't normalize empty URI");
string::size_type colon = uri.find(':',ns);
if(colon==string::npos)
throw bad_input(OPKELE_CP_ "No scheme specified in URI");
transform(
uri.begin()+ns, uri.begin()+colon+1,
back_inserter(rv), ::tolower );
bool s;
string::size_type ul = uri.find_last_not_of(whitespace)+1;
if(ul <= (colon+3))
throw bad_input(OPKELE_CP_ "Unexpected end of URI being normalized encountered");
if(uri[colon+1]!='/' || uri[colon+2]!='/')
throw bad_input(OPKELE_CP_ "Unexpected input in URI being normalized after scheme component");
if(rv=="http:")
s = false;
else if(rv=="https:")
s = true;
else{
- /* TODO: support more schemes.
- * e.g. xri. How do we normalize
+ /* TODO: support more schemes. e.g. xri. How do we normalize
* xri?
*/
rv.append(uri,colon+1,ul-colon-1);
return rv;
}
rv += "//";
string::size_type interesting = uri.find_first_of(":/#?",colon+3);
if(interesting==string::npos) {
transform(
uri.begin()+colon+3,uri.begin()+ul,
back_inserter(rv), ::tolower );
rv += '/'; return rv;
}
transform(
uri.begin()+colon+3,uri.begin()+interesting,
back_inserter(rv), ::tolower );
bool qf = false;
char ic = uri[interesting];
if(ic==':') {
string::size_type ni = uri.find_first_of("/#?%",interesting+1);
const char *nptr = uri.data()+interesting+1;
char *eptr = 0;
long port = strtol(nptr,&eptr,10);
if( (port>0) && (port<65535) && port!=(s?443:80) ) {
char tmp[8];
snprintf(tmp,sizeof(tmp),":%ld",port);
rv += tmp;
}
if(ni==string::npos) {
rv += '/'; return rv;
}
interesting = ni;
}else if(ic!='/') {
rv += '/'; rv += ic;
qf = true;
++interesting;
}
string::size_type n = interesting;
char tmp[3] = { 0,0,0 };
stack<string::size_type> psegs; psegs.push(rv.length());
string pseg;
for(;n<ul;) {
string::size_type unsafe = uri.find_first_of(qf?"%":"%/?#",n);
if(unsafe==string::npos) {
pseg.append(uri,n,ul-n-1); n = ul-1;
}else{
pseg.append(uri,n,unsafe-n);
n = unsafe;
}
char c = uri[n++];
if(c=='%') {
if((n+1)>=ul)
throw bad_input(OPKELE_CP_ "Unexpected end of URI encountered while parsing percent-encoded character");
tmp[0] = uri[n++];
tmp[1] = uri[n++];
if(!( isxdigit(tmp[0]) && isxdigit(tmp[1]) ))
throw bad_input(OPKELE_CP_ "Invalid percent-encoded character in URI being normalized");
int cc = strtol(tmp,0,16);
if( isalpha(cc) || isdigit(cc) || strchr("._~-",cc) )
pseg += cc;
else{
pseg += '%';
pseg += toupper(tmp[0]); pseg += toupper(tmp[1]);
}
}else if(qf) {
rv += pseg; rv += c;
pseg.clear();
}else if(n>=ul || strchr("?/#",c)) {
if(pseg.empty() || pseg==".") {
}else if(pseg=="..") {
if(psegs.size()>1) {
rv.resize(psegs.top()); psegs.pop();
}
}else{
psegs.push(rv.length());
if(c!='/') {
pseg += c;
qf = true;
}
rv += '/'; rv += pseg;
}
if(c=='/' && (n>=ul || strchr("?#",uri[n])) ) {
rv += '/';
if(n<ul)
qf = true;
}else if(strchr("?#",c)) {
if(psegs.size()==1 && psegs.top()==rv.length())
rv += '/';
if(pseg.empty())
rv += c;
qf = true;
}
pseg.clear();
}else{
pseg += c;
}
}
if(!pseg.empty()) {
if(!qf) rv += '/';
rv += pseg;
}
return rv;
}
+ string& strip_uri_fragment_part(string& u) {
+ string::size_type q = u.find('?'), f = u.find('#');
+ if(q==string::npos) {
+ if(f!=string::npos)
+ u.erase(f);
+ }else{
+ if(f!=string::npos) {
+ if(f<q)
+ u.erase(f,q-f);
+ else
+ u.erase(f);
+ }
+ }
+ return u;
+ }
+
+ string abi_demangle(const char *mn) {
+#ifndef HAVE_DEMANGLE
+ return mn;
+#else /* !HAVE_DEMANGLE */
+ int dstat;
+ char *demangled = abi::__cxa_demangle(mn,0,0,&dstat);
+ if(dstat)
+ return mn;
+ string rv = demangled;
+ free(demangled);
+ return rv;
+#endif /* !HAVE_DEMANGLE */
+ }
+
+ string base64_signature(const assoc_t& assoc,const basic_openid_message& om) {
+ const string& slist = om.get_field("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 += ':';
+ kv += om.get_field(f);
+ kv += '\n';
+ if(co==string::npos) break;
+ p = co+1;
+ }
+ const secret_t& secret = assoc->secret();
+ const EVP_MD *evpmd;
+ const string& at = assoc->assoc_type();
+ if(at=="HMAC-SHA256")
+ evpmd = EVP_sha256();
+ else if(at=="HMAC-SHA1")
+ evpmd = EVP_sha1();
+ else
+ throw unsupported(OPKELE_CP_ "unknown association type");
+ unsigned int md_len = 0;
+ unsigned char *md = HMAC(evpmd,
+ &(secret.front()),secret.size(),
+ (const unsigned char*)kv.data(),kv.length(),
+ 0,&md_len);
+ return encode_base64(md,md_len);
+ }
+
}
}