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gnupg/keyserver/gpgkeys_hkp.c
David Shaw b111b0ed69 * gpgkeys_hkp.c (search_key): HKP keyservers like the 0x to be present 
when searching by keyID.
2006-12-03 06:04:58 +00:00

855 lines
18 KiB
C
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/* gpgkeys_hkp.c - talk to an HKP keyserver
* Copyright (C) 2001, 2002, 2003, 2004, 2005
* 2006 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* In addition, as a special exception, the Free Software Foundation
* gives permission to link the code of the keyserver helper tools:
* gpgkeys_ldap, gpgkeys_curl and gpgkeys_hkp with the OpenSSL
* project's "OpenSSL" library (or with modified versions of it that
* use the same license as the "OpenSSL" library), and distribute the
* linked executables. You must obey the GNU General Public License
* in all respects for all of the code used other than "OpenSSL". If
* you modify this file, you may extend this exception to your version
* of the file, but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version.
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#ifdef HAVE_LIBCURL
#include <curl/curl.h>
#else
#include "curl-shim.h"
#endif
#include "keyserver.h"
#include "ksutil.h"
extern char *optarg;
extern int optind;
static FILE *input,*output,*console;
static CURL *curl;
static struct ks_options *opt;
static char errorbuffer[CURL_ERROR_SIZE];
static size_t
curl_mrindex_writer(const void *ptr,size_t size,size_t nmemb,void *stream)
{
static int checked=0,swallow=0;
if(!checked)
{
/* If the document begins with a '<', assume it's a HTML
response, which we don't support. Discard the whole message
body. GPG can handle it, but this is an optimization to deal
with it on this side of the pipe. */
const char *buf=ptr;
if(buf[0]=='<')
swallow=1;
checked=1;
}
if(swallow || fwrite(ptr,size,nmemb,stream)==nmemb)
return size*nmemb;
else
return 0;
}
/* Append but avoid creating a double slash // in the path. */
static char *
append_path(char *dest,const char *src)
{
size_t n=strlen(dest);
if(src[0]=='/' && n>0 && dest[n-1]=='/')
dest[n-1]='\0';
return strcat(dest,src);
}
int
send_key(int *eof)
{
CURLcode res;
char request[MAX_URL+15];
int begin=0,end=0,ret=KEYSERVER_INTERNAL_ERROR;
char keyid[17],state[6];
char line[MAX_LINE];
char *key=NULL,*encoded_key=NULL;
size_t keylen=0,keymax=0;
/* Read and throw away input until we see the BEGIN */
while(fgets(line,MAX_LINE,input)!=NULL)
if(sscanf(line,"KEY%*[ ]%16s%*[ ]%5s\n",keyid,state)==2
&& strcmp(state,"BEGIN")==0)
{
begin=1;
break;
}
if(!begin)
{
/* i.e. eof before the KEY BEGIN was found. This isn't an
error. */
*eof=1;
ret=KEYSERVER_OK;
goto fail;
}
/* Now slurp up everything until we see the END */
while(fgets(line,MAX_LINE,input))
if(sscanf(line,"KEY%*[ ]%16s%*[ ]%3s\n",keyid,state)==2
&& strcmp(state,"END")==0)
{
end=1;
break;
}
else
{
if(strlen(line)+keylen>keymax)
{
char *tmp;
keymax+=200;
tmp=realloc(key,keymax+1);
if(!tmp)
{
free(key);
fprintf(console,"gpgkeys: out of memory\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
key=tmp;
}
strcpy(&key[keylen],line);
keylen+=strlen(line);
}
if(!end)
{
fprintf(console,"gpgkeys: no KEY %s END found\n",keyid);
*eof=1;
ret=KEYSERVER_KEY_INCOMPLETE;
goto fail;
}
encoded_key=curl_escape(key,keylen);
if(!encoded_key)
{
fprintf(console,"gpgkeys: out of memory\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
free(key);
key=malloc(8+strlen(encoded_key)+1);
if(!key)
{
fprintf(console,"gpgkeys: out of memory\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
strcpy(key,"keytext=");
strcat(key,encoded_key);
strcpy(request,"http://");
strcat(request,opt->host);
strcat(request,":");
if(opt->port)
strcat(request,opt->port);
else
strcat(request,"11371");
strcat(request,opt->path);
/* request is MAX_URL+15 bytes long - MAX_URL covers the whole URL,
including any supplied path. The 15 covers /pks/add. */
append_path(request,"/pks/add");
if(opt->verbose>2)
fprintf(console,"gpgkeys: HTTP URL is `%s'\n",request);
curl_easy_setopt(curl,CURLOPT_URL,request);
curl_easy_setopt(curl,CURLOPT_POST,1);
curl_easy_setopt(curl,CURLOPT_POSTFIELDS,key);
curl_easy_setopt(curl,CURLOPT_FAILONERROR,1);
res=curl_easy_perform(curl);
if(res!=0)
{
fprintf(console,"gpgkeys: HTTP post error %d: %s\n",res,errorbuffer);
ret=curl_err_to_gpg_err(res);
goto fail;
}
else
fprintf(output,"\nKEY %s SENT\n",keyid);
ret=KEYSERVER_OK;
fail:
free(key);
curl_free(encoded_key);
if(ret!=0 && begin)
fprintf(output,"KEY %s FAILED %d\n",keyid,ret);
return ret;
}
static int
get_key(char *getkey)
{
CURLcode res;
char request[MAX_URL+60];
char *offset;
struct curl_writer_ctx ctx;
memset(&ctx,0,sizeof(ctx));
/* Build the search string. HKP only uses the short key IDs. */
if(strncmp(getkey,"0x",2)==0)
getkey+=2;
fprintf(output,"KEY 0x%s BEGIN\n",getkey);
if(strlen(getkey)==32)
{
fprintf(console,
"gpgkeys: HKP keyservers do not support v3 fingerprints\n");
fprintf(output,"KEY 0x%s FAILED %d\n",getkey,KEYSERVER_NOT_SUPPORTED);
return KEYSERVER_NOT_SUPPORTED;
}
strcpy(request,"http://");
strcat(request,opt->host);
strcat(request,":");
if(opt->port)
strcat(request,opt->port);
else
strcat(request,"11371");
strcat(request,opt->path);
/* request is MAX_URL+55 bytes long - MAX_URL covers the whole URL,
including any supplied path. The 60 overcovers this /pks/... etc
string plus the 8 bytes of key id */
append_path(request,"/pks/lookup?op=get&options=mr&search=0x");
/* fingerprint or long key id. Take the last 8 characters and treat
it like a short key id */
if(strlen(getkey)>8)
offset=&getkey[strlen(getkey)-8];
else
offset=getkey;
strcat(request,offset);
if(opt->verbose>2)
fprintf(console,"gpgkeys: HTTP URL is `%s'\n",request);
curl_easy_setopt(curl,CURLOPT_URL,request);
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,curl_writer);
ctx.stream=output;
curl_easy_setopt(curl,CURLOPT_FILE,&ctx);
res=curl_easy_perform(curl);
if(res!=CURLE_OK)
{
fprintf(console,"gpgkeys: HTTP fetch error %d: %s\n",res,errorbuffer);
fprintf(output,"\nKEY 0x%s FAILED %d\n",getkey,curl_err_to_gpg_err(res));
}
else
{
curl_writer_finalize(&ctx);
if(!ctx.flags.done)
{
fprintf(console,"gpgkeys: key %s not found on keyserver\n",getkey);
fprintf(output,"\nKEY 0x%s FAILED %d\n",
getkey,KEYSERVER_KEY_NOT_FOUND);
}
else
fprintf(output,"\nKEY 0x%s END\n",getkey);
}
return KEYSERVER_OK;
}
static int
get_name(const char *getkey)
{
CURLcode res;
char *request=NULL;
char *searchkey_encoded;
int ret=KEYSERVER_INTERNAL_ERROR;
struct curl_writer_ctx ctx;
memset(&ctx,0,sizeof(ctx));
searchkey_encoded=curl_escape((char *)getkey,0);
if(!searchkey_encoded)
{
fprintf(console,"gpgkeys: out of memory\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
request=malloc(MAX_URL+60+strlen(searchkey_encoded));
if(!request)
{
fprintf(console,"gpgkeys: out of memory\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
fprintf(output,"NAME %s BEGIN\n",getkey);
strcpy(request,"http://");
strcat(request,opt->host);
strcat(request,":");
if(opt->port)
strcat(request,opt->port);
else
strcat(request,"11371");
strcat(request,opt->path);
append_path(request,"/pks/lookup?op=get&options=mr&search=");
strcat(request,searchkey_encoded);
if(opt->action==KS_GETNAME)
strcat(request,"&exact=on");
if(opt->verbose>2)
fprintf(console,"gpgkeys: HTTP URL is `%s'\n",request);
curl_easy_setopt(curl,CURLOPT_URL,request);
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,curl_writer);
ctx.stream=output;
curl_easy_setopt(curl,CURLOPT_FILE,&ctx);
res=curl_easy_perform(curl);
if(res!=CURLE_OK)
{
fprintf(console,"gpgkeys: HTTP fetch error %d: %s\n",res,errorbuffer);
ret=curl_err_to_gpg_err(res);
}
else
{
curl_writer_finalize(&ctx);
if(!ctx.flags.done)
{
fprintf(console,"gpgkeys: key %s not found on keyserver\n",getkey);
ret=KEYSERVER_KEY_NOT_FOUND;
}
else
{
fprintf(output,"\nNAME %s END\n",getkey);
ret=KEYSERVER_OK;
}
}
fail:
curl_free(searchkey_encoded);
free(request);
if(ret!=KEYSERVER_OK)
fprintf(output,"\nNAME %s FAILED %d\n",getkey,ret);
return ret;
}
static int
search_key(const char *searchkey)
{
CURLcode res;
char *request=NULL;
char *searchkey_encoded;
int ret=KEYSERVER_INTERNAL_ERROR;
enum ks_search_type search_type;
search_type=classify_ks_search(&searchkey);
if(opt->debug)
fprintf(console,"gpgkeys: search type is %d, and key is \"%s\"\n",
search_type,searchkey);
searchkey_encoded=curl_escape((char *)searchkey,0);
if(!searchkey_encoded)
{
fprintf(console,"gpgkeys: out of memory\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
request=malloc(MAX_URL+60+strlen(searchkey_encoded));
if(!request)
{
fprintf(console,"gpgkeys: out of memory\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
fprintf(output,"SEARCH %s BEGIN\n",searchkey);
strcpy(request,"http://");
strcat(request,opt->host);
strcat(request,":");
if(opt->port)
strcat(request,opt->port);
else
strcat(request,"11371");
strcat(request,opt->path);
append_path(request,"/pks/lookup?op=index&options=mr&search=");
/* HKP keyservers like the 0x to be present when searching by
keyid */
if(search_type==KS_SEARCH_KEYID_SHORT || search_type==KS_SEARCH_KEYID_LONG)
strcat(request,"0x");
strcat(request,searchkey_encoded);
if(search_type!=KS_SEARCH_SUBSTR)
strcat(request,"&exact=on");
if(opt->verbose>2)
fprintf(console,"gpgkeys: HTTP URL is `%s'\n",request);
curl_easy_setopt(curl,CURLOPT_URL,request);
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,curl_mrindex_writer);
curl_easy_setopt(curl,CURLOPT_FILE,output);
res=curl_easy_perform(curl);
if(res!=0)
{
fprintf(console,"gpgkeys: HTTP search error %d: %s\n",res,errorbuffer);
ret=curl_err_to_gpg_err(res);
}
else
{
fprintf(output,"\nSEARCH %s END\n",searchkey);
ret=KEYSERVER_OK;
}
fail:
curl_free(searchkey_encoded);
free(request);
if(ret!=KEYSERVER_OK)
fprintf(output,"\nSEARCH %s FAILED %d\n",searchkey,ret);
return ret;
}
void
fail_all(struct keylist *keylist,int err)
{
if(!keylist)
return;
if(opt->action==KS_SEARCH)
{
fprintf(output,"SEARCH ");
while(keylist)
{
fprintf(output,"%s ",keylist->str);
keylist=keylist->next;
}
fprintf(output,"FAILED %d\n",err);
}
else
while(keylist)
{
fprintf(output,"KEY %s FAILED %d\n",keylist->str,err);
keylist=keylist->next;
}
}
static void
show_help (FILE *fp)
{
fprintf (fp,"-h\thelp\n");
fprintf (fp,"-V\tversion\n");
fprintf (fp,"-o\toutput to this file\n");
}
int
main(int argc,char *argv[])
{
int arg,ret=KEYSERVER_INTERNAL_ERROR;
char line[MAX_LINE];
int failed=0;
struct keylist *keylist=NULL,*keyptr=NULL;
char *proxy=NULL;
console=stderr;
/* Kludge to implement standard GNU options. */
if (argc > 1 && !strcmp (argv[1], "--version"))
{
fputs ("gpgkeys_hkp (GnuPG) " VERSION"\n", stdout);
return 0;
}
else if (argc > 1 && !strcmp (argv[1], "--help"))
{
show_help (stdout);
return 0;
}
while((arg=getopt(argc,argv,"hVo:"))!=-1)
switch(arg)
{
default:
case 'h':
show_help (console);
return KEYSERVER_OK;
case 'V':
fprintf(stdout,"%d\n%s\n",KEYSERVER_PROTO_VERSION,VERSION);
return KEYSERVER_OK;
case 'o':
output=fopen(optarg,"w");
if(output==NULL)
{
fprintf(console,"gpgkeys: Cannot open output file `%s': %s\n",
optarg,strerror(errno));
return KEYSERVER_INTERNAL_ERROR;
}
break;
}
if(argc>optind)
{
input=fopen(argv[optind],"r");
if(input==NULL)
{
fprintf(console,"gpgkeys: Cannot open input file `%s': %s\n",
argv[optind],strerror(errno));
return KEYSERVER_INTERNAL_ERROR;
}
}
if(input==NULL)
input=stdin;
if(output==NULL)
output=stdout;
opt=init_ks_options();
if(!opt)
return KEYSERVER_NO_MEMORY;
/* Get the command and info block */
while(fgets(line,MAX_LINE,input)!=NULL)
{
int err;
char option[MAX_OPTION+1];
if(line[0]=='\n')
break;
err=parse_ks_options(line,opt);
if(err>0)
{
ret=err;
goto fail;
}
else if(err==0)
continue;
if(sscanf(line,"OPTION %" MKSTRING(MAX_OPTION) "s\n",option)==1)
{
int no=0;
char *start=&option[0];
option[MAX_OPTION]='\0';
if(strncasecmp(option,"no-",3)==0)
{
no=1;
start=&option[3];
}
if(strncasecmp(start,"http-proxy",10)==0)
{
if(no)
{
free(proxy);
proxy=strdup("");
}
else if(start[10]=='=')
{
if(strlen(&start[11])<MAX_PROXY)
{
free(proxy);
proxy=strdup(&start[11]);
}
}
}
#if 0
else if(strcasecmp(start,"try-dns-srv")==0)
{
if(no)
http_flags&=~HTTP_FLAG_TRY_SRV;
else
http_flags|=HTTP_FLAG_TRY_SRV;
}
#endif
continue;
}
}
if(!opt->host)
{
fprintf(console,"gpgkeys: no keyserver host provided\n");
goto fail;
}
if(opt->timeout && register_timeout()==-1)
{
fprintf(console,"gpgkeys: unable to register timeout handler\n");
return KEYSERVER_INTERNAL_ERROR;
}
curl_global_init(CURL_GLOBAL_DEFAULT);
curl=curl_easy_init();
if(!curl)
{
fprintf(console,"gpgkeys: unable to initialize curl\n");
ret=KEYSERVER_INTERNAL_ERROR;
goto fail;
}
curl_easy_setopt(curl,CURLOPT_ERRORBUFFER,errorbuffer);
if(opt->auth)
curl_easy_setopt(curl,CURLOPT_USERPWD,opt->auth);
if(opt->debug)
{
fprintf(console,"gpgkeys: curl version = %s\n",curl_version());
curl_easy_setopt(curl,CURLOPT_STDERR,console);
curl_easy_setopt(curl,CURLOPT_VERBOSE,1);
}
if(proxy)
curl_easy_setopt(curl,CURLOPT_PROXY,proxy);
#if 0
/* By suggested convention, if the user gives a :port, then disable
SRV. */
if(opt->port)
http_flags&=~HTTP_FLAG_TRY_SRV;
#endif
/* If it's a GET or a SEARCH, the next thing to come in is the
keyids. If it's a SEND, then there are no keyids. */
if(opt->action==KS_SEND)
while(fgets(line,MAX_LINE,input)!=NULL && line[0]!='\n');
else if(opt->action==KS_GET
|| opt->action==KS_GETNAME || opt->action==KS_SEARCH)
{
for(;;)
{
struct keylist *work;
if(fgets(line,MAX_LINE,input)==NULL)
break;
else
{
if(line[0]=='\n' || line[0]=='\0')
break;
work=malloc(sizeof(struct keylist));
if(work==NULL)
{
fprintf(console,"gpgkeys: out of memory while "
"building key list\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
strcpy(work->str,line);
/* Trim the trailing \n */
work->str[strlen(line)-1]='\0';
work->next=NULL;
/* Always attach at the end to keep the list in proper
order for searching */
if(keylist==NULL)
keylist=work;
else
keyptr->next=work;
keyptr=work;
}
}
}
else
{
fprintf(console,"gpgkeys: no keyserver command specified\n");
goto fail;
}
/* Send the response */
fprintf(output,"VERSION %d\n",KEYSERVER_PROTO_VERSION);
fprintf(output,"PROGRAM %s\n\n",VERSION);
if(opt->verbose>1)
{
fprintf(console,"Host:\t\t%s\n",opt->host);
if(opt->port)
fprintf(console,"Port:\t\t%s\n",opt->port);
if(strcmp(opt->path,"/")!=0)
fprintf(console,"Path:\t\t%s\n",opt->path);
fprintf(console,"Command:\t%s\n",ks_action_to_string(opt->action));
}
if(opt->action==KS_GET)
{
keyptr=keylist;
while(keyptr!=NULL)
{
set_timeout(opt->timeout);
if(get_key(keyptr->str)!=KEYSERVER_OK)
failed++;
keyptr=keyptr->next;
}
}
else if(opt->action==KS_GETNAME)
{
keyptr=keylist;
while(keyptr!=NULL)
{
set_timeout(opt->timeout);
if(get_name(keyptr->str)!=KEYSERVER_OK)
failed++;
keyptr=keyptr->next;
}
}
else if(opt->action==KS_SEND)
{
int eof=0;
do
{
set_timeout(opt->timeout);
if(send_key(&eof)!=KEYSERVER_OK)
failed++;
}
while(!eof);
}
else if(opt->action==KS_SEARCH)
{
char *searchkey=NULL;
int len=0;
set_timeout(opt->timeout);
/* To search, we stick a space in between each key to search
for. */
keyptr=keylist;
while(keyptr!=NULL)
{
len+=strlen(keyptr->str)+1;
keyptr=keyptr->next;
}
searchkey=malloc(len+1);
if(searchkey==NULL)
{
ret=KEYSERVER_NO_MEMORY;
fail_all(keylist,KEYSERVER_NO_MEMORY);
goto fail;
}
searchkey[0]='\0';
keyptr=keylist;
while(keyptr!=NULL)
{
strcat(searchkey,keyptr->str);
strcat(searchkey," ");
keyptr=keyptr->next;
}
/* Nail that last space */
if(*searchkey)
searchkey[strlen(searchkey)-1]='\0';
if(search_key(searchkey)!=KEYSERVER_OK)
failed++;
free(searchkey);
}
else
abort();
if(!failed)
ret=KEYSERVER_OK;
fail:
while(keylist!=NULL)
{
struct keylist *current=keylist;
keylist=keylist->next;
free(current);
}
if(input!=stdin)
fclose(input);
if(output!=stdout)
fclose(output);
free_ks_options(opt);
if(curl)
curl_easy_cleanup(curl);
free(proxy);
return ret;
}
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