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gnupg/keyserver/gpgkeys_hkp.c

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/* gpgkeys_hkp.c - talk to an HKP keyserver
* Copyright (C) 2001, 2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <time.h>
#include <stdlib.h>
#include "keyserver.h"
#define GET 0
#define SEND 1
#define SEARCH 2
#define MAX_LINE 80
int verbose=0,include_disabled=0,include_revoked=0;
char *basekeyspacedn=NULL;
char host[80]={'\0'};
char portstr[10]={'\0'};
FILE *input=NULL,*output=NULL,*console=NULL,*server=NULL;
struct keylist
{
char str[MAX_LINE];
struct keylist *next;
};
int http_connect(const char *http_host,unsigned short port)
{
int sock=-1;
struct hostent *ent;
struct sockaddr_in addr;
sock=socket(AF_INET,SOCK_STREAM,0);
if(sock==-1)
{
fprintf(console,"gpgkeys: internal socket error: %s\n",strerror(errno));
goto fail;
}
ent=gethostbyname(http_host);
if(ent==NULL)
{
fprintf(console,"gpgkeys: DNS error: %s\n",hstrerror(h_errno));
goto fail;
}
addr.sin_family=AF_INET;
addr.sin_addr.s_addr=*(int *)ent->h_addr_list[0];
addr.sin_port=htons(port?port:11371);
if(connect(sock,(struct sockaddr *)&addr,sizeof(addr))==-1)
{
fprintf(console,"gpgkeys: unable to contact keyserver: %s\n",
strerror(errno));
goto fail;
}
server=fdopen(sock,"r+");
if(server==NULL)
{
fprintf(console,"gpgkeys: unable to fdopen socket: %s\n",
strerror(errno));
goto fail;
}
if(verbose>3)
fprintf(console,"gpgkeys: HKP connect to %s:%d\n",
http_host,port?port:11371);
return 0;
fail:
if(sock>-1)
close(sock);
return -1;
}
void http_disconnect(void)
{
if(verbose>3)
fprintf(console,"gpgkeys: HKP disconnect from %s\n",host);
fclose(server);
}
int http_get(const char *op,const char *search)
{
fprintf(server,"GET /pks/lookup?op=%s&search=%s HTTP/1.0\n\n",op,search);
if(verbose>2)
fprintf(console,"gpgkeys: HTTP GET /pks/lookup?op=%s&search=%s HTTP/1.0\n",
op,search);
return 0;
}
int http_post(const char *data)
{
char line[MAX_LINE];
int result;
fprintf(server,
"POST /pks/add HTTP/1.0\n"
"Content-type: application/x-www-form-urlencoded\n"
"Content-Length: %d\n\n%s",strlen(data),data);
if(verbose>2)
fprintf(console,
"gpgkeys: HTTP POST /pks/add HTTP/1.0\n"
"gpgkeys: Content-type: application/x-www-form-urlencoded\n"
"gpgkeys: Content-Length: %d\n\n",strlen(data));
/* Now wait for a response */
while(fgets(line,MAX_LINE,server)!=NULL)
if(sscanf(line,"HTTP/%*f %d OK",&result)==1)
return result;
return -1;
}
/* Returns 0 on success, -1 on failure, and 1 on eof */
int send_key(void)
{
int err,gotit=0,keylen,maxlen,ret=-1;
char keyid[17],line[MAX_LINE],*key;
key=strdup("keytext=");
if(key==NULL)
{
fprintf(console,"gpgkeys: unable to allocate for key\n");
goto fail;
}
maxlen=keylen=strlen(key);
/* Read and throw away stdin until we see the BEGIN */
while(fgets(line,MAX_LINE,input)!=NULL)
if(sscanf(line,"KEY %16s BEGIN\n",keyid)==1)
{
gotit=1;
break;
}
if(!gotit)
{
/* i.e. eof before the KEY BEGIN was found */
ret=1;
goto fail;
}
gotit=0;
/* Now slurp up everything until we see the END */
while(fgets(line,MAX_LINE,input)!=NULL)
if(sscanf(line,"KEY %16s END\n",keyid)==1)
{
gotit=1;
break;
}
else
{
char *c=line;
while(*c!='\0')
{
if(maxlen-keylen<4)
{
maxlen+=1024;
key=realloc(key,maxlen);
if(key==NULL)
{
fprintf(console,"gpgkeys: unable to reallocate for key\n");
goto fail;
}
}
if(isalnum(*c) || *c=='-')
{
key[keylen++]=*c;
key[keylen]='\0';
}
else if(*c==' ')
{
key[keylen++]='+';
key[keylen]='\0';
}
else
{
sprintf(&key[keylen],"%%%02X",*c);
keylen+=3;
}
c++;
}
}
if(!gotit)
{
fprintf(console,"gpgkeys: no KEY %s END found\n",keyid);
goto fail;
}
err=http_post(key);
if(err!=200)
{
fprintf(console,"gpgkeys: remote server returned error %d\n",err);
goto fail;
}
ret=0;
fail:
free(key);
if(ret!=0)
fprintf(output,"KEY %s FAILED\n",keyid);
return ret;
}
int get_key(char *getkey)
{
int err,gotit=0;
char search[29],line[MAX_LINE];
/* Build the search string. HKP only uses the short key IDs. */
if(strncmp(getkey,"0x",2)==0)
getkey+=2;
if(strlen(getkey)==32)
{
fprintf(console,
"gpgkeys: HKP keyservers do not support v3 fingerprints\n");
fprintf(output,"KEY 0x%s BEGIN\n",getkey);
fprintf(output,"KEY 0x%s FAILED\n",getkey);
return -1;
}
if(strlen(getkey)>8)
{
char *offset=&getkey[strlen(getkey)-8];
/* fingerprint or long key id. Take the last 8 characters and
treat it like a short key id */
sprintf(search,"0x%.8s",offset);
}
else
{
/* short key id */
sprintf(search,"0x%.8s",getkey);
}
fprintf(output,"KEY 0x%s BEGIN\n",getkey);
if(verbose>2)
fprintf(console,"gpgkeys: HKP fetch for: %s\n",search);
if(verbose)
fprintf(console,"gpgkeys: requesting key 0x%s from hkp://%s%s%s\n",
getkey,host,portstr[0]?":":"",portstr[0]?portstr:"");
err=http_get("get",search);
if(err!=0)
{
fprintf(console,"gpgkeys: HKP fetch error: %s\n",strerror(errno));
fprintf(output,"KEY 0x%s FAILED\n",getkey);
return -1;
}
while(fgets(line,MAX_LINE,server))
{
if(gotit)
{
fprintf(output,line);
if(strcmp(line,"-----END PGP PUBLIC KEY BLOCK-----\n")==0)
{
gotit=0;
fprintf(output,"KEY 0x%s END\n",getkey);
break;
}
}
else
if(strcmp(line,"-----BEGIN PGP PUBLIC KEY BLOCK-----\n")==0)
{
fprintf(output,line);
gotit=1;
}
}
return 0;
}
void print_quoted(FILE *stream,char *string,char delim)
{
while(*string)
{
if(*string==delim)
fprintf(stream,"\\x%02X",*string);
else
fputc(*string,stream);
string++;
}
}
void append_quoted(char *buffer,char *string,char delim)
{
while(*buffer)
buffer++;
while(*string)
{
if(*string==delim)
{
sprintf(buffer,"\\x%02X",*string);
buffer+=4;
}
else
*buffer=*string;
buffer++;
string++;
}
*buffer='\0';
}
unsigned int scan_isodatestr( const char *string )
{
int year, month, day;
struct tm tmbuf;
time_t stamp;
int i;
if( strlen(string) != 10 || string[4] != '-' || string[7] != '-' )
return 0;
for( i=0; i < 4; i++ )
if( !isdigit(string[i]) )
return 0;
if( !isdigit(string[5]) || !isdigit(string[6]) )
return 0;
if( !isdigit(string[8]) || !isdigit(string[9]) )
return 0;
year = atoi(string);
month = atoi(string+5);
day = atoi(string+8);
/* some basic checks */
if( year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 )
return 0;
memset( &tmbuf, 0, sizeof tmbuf );
tmbuf.tm_mday = day;
tmbuf.tm_mon = month-1;
tmbuf.tm_year = year - 1900;
tmbuf.tm_isdst = -1;
stamp = mktime( &tmbuf );
if( stamp == (time_t)-1 )
return 0;
return stamp;
}
/* pub 2048/<a href="/pks/lookup?op=get&search=0x3CB3B415">3CB3B415</a> 1998/04/03 David M. Shaw &lt;<a href="/pks/lookup?op=get&search=0x3CB3B415">dshaw@jabberwocky.com</a>&gt; */
/* Luckily enough, both the HKP server and NAI HKP interface to their
LDAP server are close enough in output so the same function can
parse them both. */
int parse_hkp_index(char *line,char **buffer)
{
static int open=0,revoked=0;
static char *key=NULL,*uid=NULL;
static unsigned int bits,createtime;
int ret=0;
/* printf("Open %d, LINE: %s, uid: %s\n",open,line,uid); */
/* Try and catch some bastardization of HKP. If we don't have
certain unchanging landmarks, we can't reliably parse the
response. */
if(open && strncasecmp(line,"</pre>",6)!=0 &&
strncasecmp(line,"pub ",4)!=0 &&
strncasecmp(line," ",4)!=0)
{
free(key);
free(uid);
fprintf(console,"gpgkeys: this keyserver is not fully HKP compatible\n");
return -1;
}
/* printf("Open %d, LINE: %s\n",open,line); */
/* For multiple UIDs */
if(open && uid!=NULL)
{
ret=0;
if(!(revoked && !include_revoked))
{
char intstr[11],*buf;
buf=realloc(*buffer,
(*buffer?strlen(*buffer):0)+
(strlen(key)*4)+
1+
(strlen(uid)*4)
+1
+2
+10
+4
+10
+1
+1);
if(buf)
*buffer=buf;
else
return -1;
append_quoted(*buffer,key,':');
append_quoted(*buffer,":",0);
append_quoted(*buffer,uid,':');
append_quoted(*buffer,":",0);
append_quoted(*buffer,revoked?"1:":":",0);
sprintf(intstr,"%u",createtime);
append_quoted(*buffer,intstr,':');
append_quoted(*buffer,"::::",0);
sprintf(intstr,"%u",bits);
append_quoted(*buffer,intstr,':');
append_quoted(*buffer,"\n",0);
ret=1;
}
if(strncmp(line," ",4)!=0)
{
revoked=0;
free(key);
free(uid);
uid=NULL;
open=0;
}
}
if(strncasecmp(line,"pub ",4)==0)
{
char *tok,*temp;
open=1;
line+=4;
tok=strsep(&line,"/");
if(tok==NULL)
return ret;
bits=atoi(tok);
tok=strsep(&line,">");
if(tok==NULL)
return ret;
tok=strsep(&line,"<");
if(tok==NULL)
{
key=strdup("00000000");
return ret;
}
key=strdup(tok);
tok=strsep(&line," ");
if(tok==NULL)
return ret;
tok=strsep(&line," ");
if(tok==NULL)
return ret;
/* The date parser wants '-' instead of '/', so... */
temp=tok;
while(*temp!='\0')
{
if(*temp=='/')
*temp='-';
temp++;
}
createtime=scan_isodatestr(tok);
}
if(open)
{
int uidindex=0;
if(line==NULL)
{
uid=strdup("Key index corrupted");
return ret;
}
/* All that's left is the user name. Strip off anything
<between brackets> and de-urlencode it. */
while(*line==' ' && *line!='\0')
line++;
if(strncmp(line,"*** KEY REVOKED ***",19)==0)
{
revoked=1;
return ret;
}
uid=malloc(strlen(line)+1);
while(*line!='\0')
{
switch(*line)
{
case '<':
while(*line!='>' && *line!='\0')
line++;
if(*line!='\0')
line++;
break;
case '&':
if((*(line+1)!='\0' && tolower(*(line+1))=='l') &&
(*(line+2)!='\0' && tolower(*(line+2))=='t') &&
(*(line+3)!='\0' && *(line+3)==';'))
{
uid[uidindex++]='<';
line+=4;
break;
}
if((*(line+1)!='\0' && tolower(*(line+1))=='g') &&
(*(line+2)!='\0' && tolower(*(line+2))=='t') &&
(*(line+3)!='\0' && *(line+3)==';'))
{
uid[uidindex++]='>';
line+=4;
break;
}
default:
uid[uidindex++]=*line;
line++;
break;
}
}
uid[uidindex]='\0';
/* Chop off the trailing \r, \n, or both. This is fussy as the
true HKP servers have \r\n, and the NAI HKP servers have just
\n. */
if(isspace(uid[uidindex-1]))
uid[uidindex-1]='\0';
if(isspace(uid[uidindex-2]))
uid[uidindex-2]='\0';
}
return ret;
}
int search_key(char *searchkey)
{
int ret=-1,err,count=0;
char *search,*request,*buffer=NULL;
char line[1024];
int max,len;
fprintf(output,"SEARCH %s BEGIN\n",searchkey);
/* Build the search string. It's going to need url-encoding. */
max=0;
len=0;
search=NULL;
request=searchkey;
while(*request!='\0')
{
if(max-len<3)
{
max+=100;
search=realloc(search,max+1); /* Note +1 for \0 */
}
if(isalnum(*request) || *request=='-')
search[len++]=*request;
else if(*request==' ')
search[len++]='+';
else
{
sprintf(&search[len],"%%%02X",*request);
len+=3;
}
request++;
}
search[len]='\0';
if(verbose>2)
fprintf(console,"gpgkeys: HKP search for: %s\n",search);
fprintf(console,("gpgkeys: searching for \"%s\" from HKP server %s\n"),
searchkey,host);
http_get("index",search);
free(search);
while(fgets(line,1024,server))
{
err=parse_hkp_index(line,&buffer);
if(err==-1)
goto fail;
count+=err;
}
fprintf(output,"COUNT %d\n%s",count,buffer);
/* fprintf(output,"COUNT -1\n%s",buffer); */
fprintf(output,"SEARCH %s END\n",searchkey);
ret=0;
fail:
free(buffer);
return ret;
}
int main(int argc,char *argv[])
{
int port=0,arg,action=-1,ret=KEYSERVER_INTERNAL_ERROR;
char line[MAX_LINE];
int version,failed=0;
struct keylist *keylist=NULL,*keyptr=NULL;
console=stderr;
fprintf(console,
"gpgkeys: WARNING: this is an *experimental* HKP interface!\n");
while((arg=getopt(argc,argv,"ho:"))!=-1)
switch(arg)
{
default:
case 'h':
fprintf(console,"-h\thelp\n");
fprintf(console,"-o\toutput to this file\n");
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;
/* Get the command and info block */
while(fgets(line,MAX_LINE,input)!=NULL)
{
char commandstr[7];
char optionstr[30];
char hash;
if(line[0]=='\n')
break;
if(sscanf(line,"%c",&hash)==1 && hash=='#')
continue;
if(sscanf(line,"COMMAND %6s\n",commandstr)==1)
{
commandstr[6]='\0';
if(strcasecmp(commandstr,"get")==0)
action=GET;
else if(strcasecmp(commandstr,"send")==0)
action=SEND;
else if(strcasecmp(commandstr,"search")==0)
action=SEARCH;
continue;
}
if(sscanf(line,"HOST %79s\n",host)==1)
{
host[79]='\0';
continue;
}
if(sscanf(line,"PORT %9s\n",portstr)==1)
{
portstr[9]='\0';
port=atoi(portstr);
continue;
}
if(sscanf(line,"VERSION %d\n",&version)==1)
{
if(version!=0)
{
ret=KEYSERVER_VERSION_ERROR;
goto fail;
}
continue;
}
if(sscanf(line,"OPTION %29s\n",optionstr)==1)
{
int no=0;
char *start=&optionstr[0];
optionstr[29]='\0';
if(strncasecmp(optionstr,"no-",3)==0)
{
no=1;
start=&optionstr[3];
}
if(strcasecmp(start,"verbose")==0)
{
if(no)
verbose--;
else
verbose++;
}
else if(strcasecmp(start,"include-disabled")==0)
{
if(no)
include_disabled=0;
else
include_disabled=1;
}
else if(strcasecmp(start,"include-revoked")==0)
{
if(no)
include_revoked=0;
else
include_revoked=1;
}
else if(strcasecmp(start,"honor-http-proxy")==0 ||
strcasecmp(start,"broken-http-proxy")==0 ||
strcasecmp(start,"include-subkeys")==0)
{
fprintf(stderr,"gpgkeys: HKP does not currently support %s\n",
start);
}
continue;
}
}
/* 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(action==SEND)
while(fgets(line,MAX_LINE,input)!=NULL && line[0]!='\n');
else if(action==GET || action==SEARCH)
{
for(;;)
{
struct keylist *work;
if(fgets(line,MAX_LINE,input)==NULL)
break;
else
{
if(line[0]=='\n')
break;
work=malloc(sizeof(struct keylist));
if(work==NULL)
{
fprintf(console,"gpgkeys: out of memory while "
"building key list\n");
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 0\n");
fprintf(output,"PROGRAM %s\n\n",VERSION);
if(verbose>1)
{
fprintf(console,"Host:\t\t%s\n",host);
if(port)
fprintf(console,"Port:\t\t%d\n",port);
fprintf(console,"Command:\t%s\n",action==GET?"GET":
action==SEND?"SEND":"SEARCH");
}
#if 0
if(verbose>1)
{
vals=ldap_get_values(ldap,res,"software");
if(vals!=NULL)
{
fprintf(console,"Server: \t%s\n",vals[0]);
ldap_value_free(vals);
}
vals=ldap_get_values(ldap,res,"version");
if(vals!=NULL)
{
fprintf(console,"Version:\t%s\n",vals[0]);
ldap_value_free(vals);
}
}
#endif
switch(action)
{
case GET:
keyptr=keylist;
while(keyptr!=NULL)
{
http_connect(host,port);
if(get_key(keyptr->str)==-1)
failed++;
http_disconnect();
keyptr=keyptr->next;
}
break;
case SEND:
{
int ret2;
do
{
http_connect(host,port);
ret2=send_key();
if(ret2==-1)
failed++;
http_disconnect();
}
while(ret2!=1);
}
break;
case SEARCH:
{
char *searchkey=NULL;
int len=0;
/* 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)
goto fail;
searchkey[0]='\0';
keyptr=keylist;
while(keyptr!=NULL)
{
strcat(searchkey,keyptr->str);
strcat(searchkey," ");
keyptr=keyptr->next;
}
/* Nail that last space */
searchkey[strlen(searchkey)-1]='\0';
http_connect(host,port);
if(search_key(searchkey)==-1)
{
fprintf(output,"SEARCH %s FAILED\n",searchkey);
failed++;
}
http_disconnect();
free(searchkey);
}
break;
}
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);
return ret;
}
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