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netcdf-c/oc2/occurlfunctions.c
Dennis Heimbigner 948304a79f Fix Proxy problem for DAP2 
re: Issue https://github.com/Unidata/netcdf-c/issues/2752

The authorization setup when using a proxy is apparently not
being used, or used incorrectly.

This PR ensures that the relevant curl options, specifically
CURLOPT_VERIFYHOST and CURLOPT_VERIFYPEER, are properly setup.
As part of this, the ability to turn off these options was fixed.
Note that no testing of this PR is currently possible because we
do not have access to a proxy.
2023-10-08 14:38:07 -06:00

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/* Copyright 2018, UCAR/Unidata and OPeNDAP, Inc.
See the COPYRIGHT file for more information. */
/* WARNING: oc2/occurlfunctions.c and libdap4/d4curlfunctions.c
should be merged since they are essentially the same file.
In the meantime, changes to one should be propagated to the other.
*/
#include "config.h"
#include <stdlib.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include "ncrc.h"
#include "ocinternal.h"
#include "ocdebug.h"
#include "occurlfunctions.h"
#define OC_MAX_REDIRECTS 20L
/* Mnemonic */
#define OPTARG uintptr_t
/* Define some .rc file entries of interest*/
#define NETRCFILETAG "HTTP.NETRC"
#define SETCURLOPT(state,flag,value) {if(ocset_curlopt(state,flag,(void*)value) != NC_NOERR) {goto done;}}
/*
Set a specific curl flag; primary wrapper for curl_easy_setopt
*/
OCerror
ocset_curlopt(OCstate* state, int flag, void* value)
{
OCerror stat = OC_NOERR;
CURLcode cstat = CURLE_OK;
cstat = OCCURLERR(state,curl_easy_setopt(state->curl,flag,value));
if(cstat != CURLE_OK)
stat = OC_ECURL;
return stat;
}
/* Check return value */
#define CHECK(state,flag,value) {if(ocset_curlopt(state,flag,(void*)value) != OC_NOERR) {goto done;}}
/*
Update a specific flag from state
*/
OCerror
ocset_curlflag(OCstate* state, int flag)
{
OCerror stat = OC_NOERR;
switch (flag) {
case CURLOPT_USERPWD: /* Does both user and pwd */
if(state->auth->creds.user != NULL && state->auth->creds.pwd != NULL) {
SETCURLOPT(state, CURLOPT_USERNAME, state->auth->creds.user);
SETCURLOPT(state, CURLOPT_PASSWORD, state->auth->creds.pwd);
SETCURLOPT(state, CURLOPT_HTTPAUTH, (OPTARG)CURLAUTH_ANY);
}
break;
case CURLOPT_COOKIEJAR: case CURLOPT_COOKIEFILE:
if(state->auth->curlflags.cookiejar) {
/* Assume we will read and write cookies to same place */
SETCURLOPT(state, CURLOPT_COOKIEJAR, state->auth->curlflags.cookiejar);
SETCURLOPT(state, CURLOPT_COOKIEFILE, state->auth->curlflags.cookiejar);
}
break;
case CURLOPT_NETRC: case CURLOPT_NETRC_FILE:
if(state->auth->curlflags.netrc) {
SETCURLOPT(state, CURLOPT_NETRC, (OPTARG)CURL_NETRC_OPTIONAL);
/* IF HTTP.NETRC is set with "", then assume the default .netrc file (which is apparently CWD) */
if(strlen(state->auth->curlflags.netrc)>0)
SETCURLOPT(state, CURLOPT_NETRC_FILE, state->auth->curlflags.netrc);
}
break;
case CURLOPT_VERBOSE:
if(state->auth->curlflags.verbose)
SETCURLOPT(state, CURLOPT_VERBOSE, (OPTARG)1L);
break;
case CURLOPT_TIMEOUT:
if(state->auth->curlflags.timeout)
SETCURLOPT(state, CURLOPT_TIMEOUT, (OPTARG)((long)state->auth->curlflags.timeout));
break;
case CURLOPT_CONNECTTIMEOUT:
if(state->auth->curlflags.connecttimeout)
SETCURLOPT(state, CURLOPT_CONNECTTIMEOUT, (OPTARG)((long)state->auth->curlflags.connecttimeout));
break;
case CURLOPT_USERAGENT:
if(state->auth->curlflags.useragent)
SETCURLOPT(state, CURLOPT_USERAGENT, state->auth->curlflags.useragent);
break;
case CURLOPT_FOLLOWLOCATION:
SETCURLOPT(state, CURLOPT_FOLLOWLOCATION, (OPTARG)1L);
break;
case CURLOPT_MAXREDIRS:
SETCURLOPT(state, CURLOPT_MAXREDIRS, (OPTARG)OC_MAX_REDIRECTS);
break;
case CURLOPT_ERRORBUFFER:
SETCURLOPT(state, CURLOPT_ERRORBUFFER, state->error.curlerrorbuf);
break;
case CURLOPT_ACCEPT_ENCODING:
if(state->auth->curlflags.encode) {
SETCURLOPT(state, CURLOPT_ACCEPT_ENCODING, "" ); /* Accept all available encodings */
} else {
SETCURLOPT(state, CURLOPT_ACCEPT_ENCODING, NULL);
}
break;
case CURLOPT_PROXY:
if(state->auth->proxy.host != NULL) {
SETCURLOPT(state, CURLOPT_PROXY, state->auth->proxy.host);
SETCURLOPT(state, CURLOPT_PROXYPORT, (OPTARG)(long)state->auth->proxy.port);
if(state->auth->proxy.user != NULL && state->auth->proxy.pwd != NULL) {
SETCURLOPT(state, CURLOPT_PROXYUSERNAME, state->auth->proxy.user);
SETCURLOPT(state, CURLOPT_PROXYPASSWORD, state->auth->proxy.pwd);
#ifdef CURLOPT_PROXYAUTH
SETCURLOPT(state, CURLOPT_PROXYAUTH, (long)CURLAUTH_ANY);
#endif
}
}
break;
case CURLOPT_SSL_VERIFYPEER:
/* VERIFYPEER == 0 => VERIFYHOST == 0 */
/* We need to have 2 states: default and a set value */
/* So -1 => default >= 0 => use value */
if(state->auth->ssl.verifypeer >= 0) {
SETCURLOPT(state, CURLOPT_SSL_VERIFYPEER, (OPTARG)(state->auth->ssl.verifypeer));
if(state->auth->ssl.verifypeer == 0) state->auth->ssl.verifyhost = 0;
}
break;
case CURLOPT_SSL_VERIFYHOST:
#ifdef HAVE_LIBCURL_766
if(state->auth->ssl.verifyhost >= 0) {
SETCURLOPT(state, CURLOPT_SSL_VERIFYHOST, (OPTARG)(state->auth->ssl.verifyhost));
}
#endif
break;
case CURLOPT_SSLCERT:
if(state->auth->ssl.certificate)
SETCURLOPT(state, CURLOPT_SSLCERT, state->auth->ssl.certificate);
break;
case CURLOPT_SSLKEY:
if(state->auth->ssl.key)
SETCURLOPT(state, CURLOPT_SSLKEY, state->auth->ssl.key);
if(state->auth->ssl.keypasswd)
/* libcurl prior to 7.16.4 used 'CURLOPT_SSLKEYPASSWD' */
SETCURLOPT(state, CURLOPT_SSLKEYPASSWD, state->auth->ssl.keypasswd);
break;
case CURLOPT_CAINFO:
if(state->auth->ssl.cainfo)
SETCURLOPT(state, CURLOPT_CAINFO, state->auth->ssl.cainfo);
break;
case CURLOPT_CAPATH:
if(state->auth->ssl.capath)
SETCURLOPT(state, CURLOPT_CAPATH, state->auth->ssl.capath);
break;
case CURLOPT_USE_SSL:
break;
#ifdef HAVE_CURLOPT_BUFFERSIZE
case CURLOPT_BUFFERSIZE:
SETCURLOPT(state, CURLOPT_BUFFERSIZE, (OPTARG)state->curlbuffersize);
break;
#endif
#ifdef HAVE_CURLOPT_KEEPALIVE
case CURLOPT_TCP_KEEPALIVE:
if(state->curlkeepalive.active != 0)
SETCURLOPT(state, CURLOPT_TCP_KEEPALIVE, (OPTARG)1L);
if(state->curlkeepalive.idle > 0)
SETCURLOPT(state, CURLOPT_TCP_KEEPIDLE, (OPTARG)state->curlkeepalive.idle);
if(state->curlkeepalive.interval > 0)
SETCURLOPT(state, CURLOPT_TCP_KEEPINTVL, (OPTARG)state->curlkeepalive.interval);
break;
#endif
default:
nclog(NCLOGWARN,"Attempt to update unexpected curl flag: %d",flag);
break;
}
done:
return stat;
}
/* Set various general curl flags per fetch */
OCerror
ocset_flags_perfetch(OCstate* state)
{
OCerror stat = OC_NOERR;
/* currently none */
return stat;
}
/* Set various general curl flags per link */
OCerror
ocset_flags_perlink(OCstate* state)
{
OCerror stat = OC_NOERR;
/* Following are always set */
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_ACCEPT_ENCODING);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_NETRC);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_VERBOSE);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_TIMEOUT);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_CONNECTTIMEOUT);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_USERAGENT);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_COOKIEJAR);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_USERPWD);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_PROXY);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_SSL_VERIFYPEER);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_SSL_VERIFYHOST);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_SSLCERT);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_SSLKEY);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_CAINFO);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_CAPATH);
if(stat == OC_NOERR) stat = ocset_curlflag(state,CURLOPT_USE_SSL);
if(stat == OC_NOERR) stat = ocset_curlflag(state, CURLOPT_FOLLOWLOCATION);
if(stat == OC_NOERR) stat = ocset_curlflag(state, CURLOPT_MAXREDIRS);
if(stat == OC_NOERR) stat = ocset_curlflag(state, CURLOPT_ERRORBUFFER);
#ifdef HAVE_CURLOPT_BUFFERSIZE
/* Optional */
if(stat == OC_NOERR && state->curlbuffersize > 0)
stat = ocset_curlflag(state, CURLOPT_BUFFERSIZE);
#endif
#ifdef HAVE_CURLOPT_KEEPALIVE
if(stat == NC_NOERR && state->curlkeepalive.active != 0)
stat = ocset_curlflag(state, CURLOPT_TCP_KEEPALIVE);
#endif
return stat;
}
void
oc_curl_debug(OCstate* state)
{
state->auth->curlflags.verbose = 1;
ocset_curlflag(state,CURLOPT_VERBOSE);
ocset_curlflag(state,CURLOPT_ERRORBUFFER);
}
/* Misc. */
int
ocrc_netrc_required(OCstate* state)
{
char* netrcfile = NC_rclookup(NETRCFILETAG,state->uri->uri,NULL);
return (netrcfile != NULL || state->auth->curlflags.netrc != NULL ? 0 : 1);
}
void
oc_curl_printerror(OCstate* state)
{
fprintf(stderr,"curl error details: %s\n",state->curlerror);
}
/* See if http: protocol is supported */
void
oc_curl_protocols(OCstate* state)
{
const char* const* proto; /*weird*/
curl_version_info_data* curldata;
curldata = curl_version_info(CURLVERSION_NOW);
for(proto=curldata->protocols;*proto;proto++) {
if(strcmp("http",*proto)==0)
state->auth->curlflags.proto_https=1;
}
}
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