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efea9c3ce1
gnupg/g10/keyserver.c
David Shaw efea9c3ce1 * keyserver.c (keyserver_typemap): Special-case LDAP since curl will 
report that it can handle it, and we don't want it to.
2005-07-27 01:24:57 +00:00

1792 lines
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/* keyserver.c - generic keyserver code
* Copyright (C) 2001, 2002, 2003, 2004, 2005 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.
*/
#include <config.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#ifdef HAVE_LIBCURL
#include <curl/curl.h>
#endif
#include "filter.h"
#include "keydb.h"
#include "status.h"
#include "exec.h"
#include "main.h"
#include "i18n.h"
#include "iobuf.h"
#include "memory.h"
#include "ttyio.h"
#include "options.h"
#include "packet.h"
#include "trustdb.h"
#include "keyserver-internal.h"
#include "util.h"
#define GET 0
#define SEND 1
#define SEARCH 2
#define GPGKEYS_PREFIX "gpgkeys_"
struct keyrec
{
KEYDB_SEARCH_DESC desc;
u32 createtime,expiretime;
int size,flags;
byte type;
IOBUF uidbuf;
unsigned int lines;
};
/* Tell remote processes about these options */
#define REMOTE_TELL (KEYSERVER_INCLUDE_REVOKED|KEYSERVER_INCLUDE_SUBKEYS|KEYSERVER_TRY_DNS_SRV)
static struct parse_options keyserver_opts[]=
{
{"include-revoked",KEYSERVER_INCLUDE_REVOKED,NULL},
{"include-subkeys",KEYSERVER_INCLUDE_SUBKEYS,NULL},
{"keep-temp-files",KEYSERVER_KEEP_TEMP_FILES,NULL},
{"refresh-add-fake-v3-keyids",KEYSERVER_ADD_FAKE_V3,NULL},
{"auto-key-retrieve",KEYSERVER_AUTO_KEY_RETRIEVE,NULL},
{"try-dns-srv",KEYSERVER_TRY_DNS_SRV,NULL},
{"honor-keyserver-url",KEYSERVER_HONOR_KEYSERVER_URL,NULL},
{NULL,0,NULL}
};
static int keyserver_work(int action,STRLIST list,KEYDB_SEARCH_DESC *desc,
int count,struct keyserver_spec *keyserver);
int
parse_keyserver_options(char *options)
{
int ret=1;
char *tok;
while((tok=optsep(&options)))
{
if(tok[0]=='\0')
continue;
/* For backwards compatibility. 1.2.x used honor-http-proxy and
there are a good number of documents published that recommend
it. */
if(ascii_strcasecmp(tok,"honor-http-proxy")==0)
tok="http-proxy";
else if(ascii_strcasecmp(tok,"no-honor-http-proxy")==0)
tok="no-http-proxy";
/* We accept quite a few possible options here - some options to
handle specially, the keyserver_options list, and import and
export options that pertain to keyserver operations. Note
that you must use strncasecmp here as there might be an
=argument attached which will foil the use of strcasecmp. */
#ifdef EXEC_TEMPFILE_ONLY
if(ascii_strncasecmp(tok,"use-temp-files",14)==0 ||
ascii_strncasecmp(tok,"no-use-temp-files",17)==0)
log_info(_("WARNING: keyserver option `%s' is not used"
" on this platform\n"),tok);
#else
if(ascii_strncasecmp(tok,"use-temp-files",14)==0)
opt.keyserver_options.options|=KEYSERVER_USE_TEMP_FILES;
else if(ascii_strncasecmp(tok,"no-use-temp-files",17)==0)
opt.keyserver_options.options&=~KEYSERVER_USE_TEMP_FILES;
#endif
else if(!parse_options(tok,&opt.keyserver_options.options,
keyserver_opts,0)
&& !parse_import_options(tok,
&opt.keyserver_options.import_options,0)
&& !parse_export_options(tok,
&opt.keyserver_options.export_options,0))
{
/* All of the standard options have failed, so the option is
destined for a keyserver plugin. */
char *arg=argsplit(tok);
if(arg)
{
char *joined;
joined=m_alloc(strlen(tok)+1+strlen(arg)+1);
/* Make a canonical name=value form with no
spaces */
strcpy(joined,tok);
strcat(joined,"=");
strcat(joined,arg);
add_to_strlist(&opt.keyserver_options.other,joined);
m_free(joined);
}
else
add_to_strlist(&opt.keyserver_options.other,tok);
}
}
return ret;
}
void
free_keyserver_spec(struct keyserver_spec *keyserver)
{
m_free(keyserver->uri);
m_free(keyserver->scheme);
m_free(keyserver->auth);
m_free(keyserver->host);
m_free(keyserver->port);
m_free(keyserver->path);
m_free(keyserver->opaque);
m_free(keyserver);
}
/* TODO: once we cut over to an all-curl world, we don't need this
parser any longer so it can be removed, or at least moved to
keyserver/ksutil.c for limited use in gpgkeys_ldap or the like. */
struct keyserver_spec *
parse_keyserver_uri(const char *uri,int require_scheme,
const char *configname,unsigned int configlineno)
{
int assume_hkp=0;
struct keyserver_spec *keyserver;
const char *idx;
int count;
assert(uri!=NULL);
keyserver=m_alloc_clear(sizeof(struct keyserver_spec));
keyserver->uri=m_strdup(uri);
/* Get the scheme */
for(idx=uri,count=0;*idx && *idx!=':';idx++)
{
count++;
/* Do we see the start of an RFC-2732 ipv6 address here? If so,
there clearly isn't a scheme so get out early. */
if(*idx=='[')
{
/* Was the '[' the first thing in the string? If not, we
have a mangled scheme with a [ in it so fail. */
if(count==1)
break;
else
goto fail;
}
}
if(count==0)
goto fail;
if(*idx=='\0' || *idx=='[')
{
if(require_scheme)
return NULL;
/* Assume HKP if there is no scheme */
assume_hkp=1;
keyserver->scheme=m_strdup("hkp");
}
else
{
int i;
keyserver->scheme=m_alloc(count+1);
/* Force to lowercase */
for(i=0;i<count;i++)
keyserver->scheme[i]=ascii_tolower(uri[i]);
keyserver->scheme[i]='\0';
/* Skip past the scheme and colon */
uri+=count+1;
}
if(ascii_strcasecmp(keyserver->scheme,"x-broken-hkp")==0)
{
deprecated_warning(configname,configlineno,"x-broken-hkp",
"--keyserver-options ","broken-http-proxy");
m_free(keyserver->scheme);
keyserver->scheme=m_strdup("hkp");
add_to_strlist(&opt.keyserver_options.other,"broken-http-proxy");
}
else if(ascii_strcasecmp(keyserver->scheme,"x-hkp")==0)
{
/* Canonicalize this to "hkp" so it works with both the internal
and external keyserver interface. */
m_free(keyserver->scheme);
keyserver->scheme=m_strdup("hkp");
}
if(assume_hkp || (uri[0]=='/' && uri[1]=='/'))
{
/* Two slashes means network path. */
/* Skip over the "//", if any */
if(!assume_hkp)
uri+=2;
/* Do we have userinfo auth data present? */
for(idx=uri,count=0;*idx && *idx!='@' && *idx!='/';idx++)
count++;
/* We found a @ before the slash, so that means everything
before the @ is auth data. */
if(*idx=='@')
{
if(count==0)
goto fail;
keyserver->auth=m_alloc(count+1);
strncpy(keyserver->auth,uri,count);
keyserver->auth[count]='\0';
uri+=count+1;
}
/* Is it an RFC-2732 ipv6 [literal address] ? */
if(*uri=='[')
{
for(idx=uri+1,count=1;*idx
&& ((isascii (*idx) && isxdigit(*idx))
|| *idx==':' || *idx=='.');idx++)
count++;
/* Is the ipv6 literal address terminated? */
if(*idx==']')
count++;
else
goto fail;
}
else
for(idx=uri,count=0;*idx && *idx!=':' && *idx!='/';idx++)
count++;
if(count==0)
goto fail;
keyserver->host=m_alloc(count+1);
strncpy(keyserver->host,uri,count);
keyserver->host[count]='\0';
/* Skip past the host */
uri+=count;
if(*uri==':')
{
/* It would seem to be reasonable to limit the range of the
ports to values between 1-65535, but RFC 1738 and 1808
imply there is no limit. Of course, the real world has
limits. */
for(idx=uri+1,count=0;*idx && *idx!='/';idx++)
{
count++;
/* Ports are digits only */
if(!digitp(idx))
goto fail;
}
keyserver->port=m_alloc(count+1);
strncpy(keyserver->port,uri+1,count);
keyserver->port[count]='\0';
/* Skip past the colon and port number */
uri+=1+count;
}
/* Everything else is the path */
if(*uri)
keyserver->path=m_strdup(uri);
else
keyserver->path=m_strdup("/");
}
else if(uri[0]!='/')
{
/* No slash means opaque. Just record the opaque blob and get
out. */
keyserver->opaque=m_strdup(uri);
}
else
{
/* One slash means absolute path. We don't need to support that
yet. */
goto fail;
}
return keyserver;
fail:
free_keyserver_spec(keyserver);
return NULL;
}
struct keyserver_spec *
parse_preferred_keyserver(PKT_signature *sig)
{
struct keyserver_spec *spec=NULL;
const byte *p;
size_t plen;
p=parse_sig_subpkt(sig->hashed,SIGSUBPKT_PREF_KS,&plen);
if(p && plen)
{
byte *dupe=m_alloc(plen+1);
memcpy(dupe,p,plen);
dupe[plen]='\0';
spec=parse_keyserver_uri(dupe,1,NULL,0);
m_free(dupe);
}
return spec;
}
static void
print_keyrec(int number,struct keyrec *keyrec)
{
int i;
iobuf_writebyte(keyrec->uidbuf,0);
iobuf_flush_temp(keyrec->uidbuf);
printf("(%d)\t%s ",number,iobuf_get_temp_buffer(keyrec->uidbuf));
if(keyrec->size>0)
printf("%d bit ",keyrec->size);
if(keyrec->type)
{
const char *str=pubkey_algo_to_string(keyrec->type);
if(str)
printf("%s ",str);
else
printf("unknown ");
}
switch(keyrec->desc.mode)
{
/* If the keyserver helper gave us a short keyid, we have no
choice but to use it. Do check --keyid-format to add a 0x if
needed. */
case KEYDB_SEARCH_MODE_SHORT_KID:
printf("key %s%08lX",
(opt.keyid_format==KF_0xSHORT
|| opt.keyid_format==KF_0xLONG)?"0x":"",
(ulong)keyrec->desc.u.kid[1]);
break;
/* However, if it gave us a long keyid, we can honor
--keyid-format */
case KEYDB_SEARCH_MODE_LONG_KID:
printf("key %s",keystr(keyrec->desc.u.kid));
break;
case KEYDB_SEARCH_MODE_FPR16:
printf("key ");
for(i=0;i<16;i++)
printf("%02X",keyrec->desc.u.fpr[i]);
break;
case KEYDB_SEARCH_MODE_FPR20:
printf("key ");
for(i=0;i<20;i++)
printf("%02X",keyrec->desc.u.fpr[i]);
break;
default:
BUG();
break;
}
if(keyrec->createtime>0)
{
printf(", ");
printf(_("created: %s"),strtimestamp(keyrec->createtime));
}
if(keyrec->expiretime>0)
{
printf(", ");
printf(_("expires: %s"),strtimestamp(keyrec->expiretime));
}
if(keyrec->flags&1)
printf(" (%s)",_("revoked"));
if(keyrec->flags&2)
printf(" (%s)",_("disabled"));
if(keyrec->flags&4)
printf(" (%s)",_("expired"));
printf("\n");
}
/* Returns a keyrec (which must be freed) once a key is complete, and
NULL otherwise. Call with a NULL keystring once key parsing is
complete to return any unfinished keys. */
static struct keyrec *
parse_keyrec(char *keystring)
{
static struct keyrec *work=NULL;
struct keyrec *ret=NULL;
char *record;
int i;
if(keystring==NULL)
{
if(work==NULL)
return NULL;
else if(work->desc.mode==KEYDB_SEARCH_MODE_NONE)
{
m_free(work);
return NULL;
}
else
{
ret=work;
work=NULL;
return ret;
}
}
if(work==NULL)
{
work=m_alloc_clear(sizeof(struct keyrec));
work->uidbuf=iobuf_temp();
}
/* Remove trailing whitespace */
for(i=strlen(keystring);i>0;i--)
if(ascii_isspace(keystring[i-1]))
keystring[i-1]='\0';
else
break;
if((record=strsep(&keystring,":"))==NULL)
return ret;
if(ascii_strcasecmp("pub",record)==0)
{
char *tok;
if(work->desc.mode)
{
ret=work;
work=m_alloc_clear(sizeof(struct keyrec));
work->uidbuf=iobuf_temp();
}
if((tok=strsep(&keystring,":"))==NULL)
return ret;
classify_user_id(tok,&work->desc);
if(work->desc.mode!=KEYDB_SEARCH_MODE_SHORT_KID
&& work->desc.mode!=KEYDB_SEARCH_MODE_LONG_KID
&& work->desc.mode!=KEYDB_SEARCH_MODE_FPR16
&& work->desc.mode!=KEYDB_SEARCH_MODE_FPR20)
{
work->desc.mode=KEYDB_SEARCH_MODE_NONE;
return ret;
}
/* Note all items after this are optional. This allows us to
have a pub line as simple as pub:keyid and nothing else. */
work->lines++;
if((tok=strsep(&keystring,":"))==NULL)
return ret;
work->type=atoi(tok);
if((tok=strsep(&keystring,":"))==NULL)
return ret;
work->size=atoi(tok);
if((tok=strsep(&keystring,":"))==NULL)
return ret;
if(atoi(tok)<=0)
work->createtime=0;
else
work->createtime=atoi(tok);
if((tok=strsep(&keystring,":"))==NULL)
return ret;
if(atoi(tok)<=0)
work->expiretime=0;
else
{
work->expiretime=atoi(tok);
/* Force the 'e' flag on if this key is expired. */
if(work->expiretime<=make_timestamp())
work->flags|=4;
}
if((tok=strsep(&keystring,":"))==NULL)
return ret;
while(*tok)
switch(*tok++)
{
case 'r':
case 'R':
work->flags|=1;
break;
case 'd':
case 'D':
work->flags|=2;
break;
case 'e':
case 'E':
work->flags|=4;
break;
}
}
else if(ascii_strcasecmp("uid",record)==0 && work->desc.mode)
{
char *userid,*tok,*decoded;
if((tok=strsep(&keystring,":"))==NULL)
return ret;
if(strlen(tok)==0)
return ret;
userid=tok;
/* By definition, de-%-encoding is always smaller than the
original string so we can decode in place. */
i=0;
while(*tok)
if(tok[0]=='%' && tok[1] && tok[2])
{
if((userid[i]=hextobyte(&tok[1]))==-1)
userid[i]='?';
i++;
tok+=3;
}
else
userid[i++]=*tok++;
/* We don't care about the other info provided in the uid: line
since no keyserver supports marking userids with timestamps
or revoked/expired/disabled yet. */
/* No need to check for control characters, as utf8_to_native
does this for us. */
decoded=utf8_to_native(userid,i,0);
if(strlen(decoded)>opt.screen_columns-10)
decoded[opt.screen_columns-10]='\0';
iobuf_writestr(work->uidbuf,decoded);
m_free(decoded);
iobuf_writestr(work->uidbuf,"\n\t");
work->lines++;
}
/* Ignore any records other than "pri" and "uid" for easy future
growth. */
return ret;
}
/* TODO: do this as a list sent to keyserver_work rather than calling
it once for each key to get the correct counts after the import
(cosmetics, really) and to better take advantage of the keyservers
that can do multiple fetches in one go (LDAP). */
static int
show_prompt(KEYDB_SEARCH_DESC *desc,int numdesc,int count,const char *search)
{
char *answer;
if(count && opt.command_fd==-1)
{
static int from=1;
tty_printf("Keys %d-%d of %d for \"%s\". ",from,numdesc,count,search);
from=numdesc+1;
}
answer=cpr_get_no_help("keysearch.prompt",
_("Enter number(s), N)ext, or Q)uit > "));
/* control-d */
if(answer[0]=='\x04')
{
printf("Q\n");
answer[0]='q';
}
if(answer[0]=='q' || answer[0]=='Q')
{
m_free(answer);
return 1;
}
else if(atoi(answer)>=1 && atoi(answer)<=numdesc)
{
char *split=answer,*num;
while((num=strsep(&split," ,"))!=NULL)
if(atoi(num)>=1 && atoi(num)<=numdesc)
keyserver_work(GET,NULL,&desc[atoi(num)-1],1,opt.keyserver);
m_free(answer);
return 1;
}
return 0;
}
/* Count and searchstr are just for cosmetics. If the count is too
small, it will grow safely. If negative it disables the "Key x-y
of z" messages. searchstr should be UTF-8 (rather than native). */
static void
keyserver_search_prompt(IOBUF buffer,const char *searchstr)
{
int i=0,validcount=0,started=0,header=0,count=1;
unsigned int maxlen,buflen,numlines=0;
KEYDB_SEARCH_DESC *desc;
byte *line=NULL;
char *localstr=NULL;
if(searchstr)
localstr=utf8_to_native(searchstr,strlen(searchstr),0);
desc=m_alloc(count*sizeof(KEYDB_SEARCH_DESC));
for(;;)
{
struct keyrec *keyrec;
int rl;
maxlen=1024;
rl=iobuf_read_line(buffer,&line,&buflen,&maxlen);
if(opt.with_colons)
{
if(!header && ascii_strncasecmp("SEARCH ",line,7)==0
&& ascii_strncasecmp(" BEGIN",&line[strlen(line)-7],6)==0)
{
header=1;
continue;
}
else if(ascii_strncasecmp("SEARCH ",line,7)==0
&& ascii_strncasecmp(" END",&line[strlen(line)-5],4)==0)
continue;
printf("%s",line);
}
/* Look for an info: line. The only current info: values
defined are the version and key count. */
if(!started && rl>0 && ascii_strncasecmp("info:",line,5)==0)
{
char *tok,*str=&line[5];
if((tok=strsep(&str,":"))!=NULL)
{
int version;
if(sscanf(tok,"%d",&version)!=1)
version=1;
if(version!=1)
{
log_error(_("invalid keyserver protocol "
"(us %d!=handler %d)\n"),1,version);
break;
}
}
if((tok=strsep(&str,":"))!=NULL && sscanf(tok,"%d",&count)==1)
{
if(count==0)
goto notfound;
else if(count<0)
count=10;
else
validcount=1;
desc=m_realloc(desc,count*sizeof(KEYDB_SEARCH_DESC));
}
started=1;
continue;
}
if(rl==0)
{
keyrec=parse_keyrec(NULL);
if(keyrec==NULL)
{
if(i==0)
{
count=0;
break;
}
if(i!=count)
validcount=0;
for(;;)
{
if(show_prompt(desc,i,validcount?count:0,localstr))
break;
validcount=0;
}
break;
}
}
else
keyrec=parse_keyrec(line);
if(i==count)
{
/* keyserver helper sent more keys than they claimed in the
info: line. */
count+=10;
desc=m_realloc(desc,count*sizeof(KEYDB_SEARCH_DESC));
validcount=0;
}
if(keyrec)
{
desc[i]=keyrec->desc;
if(!opt.with_colons)
{
/* screen_lines - 1 for the prompt. */
if(numlines+keyrec->lines>opt.screen_lines-1)
{
if(show_prompt(desc,i,validcount?count:0,localstr))
break;
else
numlines=0;
}
print_keyrec(i+1,keyrec);
}
numlines+=keyrec->lines;
iobuf_close(keyrec->uidbuf);
m_free(keyrec);
started=1;
i++;
}
}
notfound:
/* Leave this commented out or now, and perhaps for a very long
time. All HKPish servers return HTML error messages for
no-key-found. */
/*
if(!started)
log_info(_("keyserver does not support searching\n"));
else
*/
if(count==0)
{
if(localstr)
log_info(_("key \"%s\" not found on keyserver\n"),localstr);
else
log_info(_("key not found on keyserver\n"));
}
m_free(localstr);
m_free(desc);
m_free(line);
}
static int
curl_can_handle(const char *scheme)
{
#if defined(HAVE_LIBCURL)
const char * const *proto;
curl_version_info_data *data=curl_version_info(CURLVERSION_NOW);
assert(data);
for(proto=data->protocols;*proto;proto++)
if(strcasecmp(*proto,scheme)==0)
return 1;
#elif defined(FAKE_CURL)
/* If we're faking curl, then we only support HTTP */
if(strcasecmp(scheme,"http")==0)
return 1;
#endif
return 0;
}
/* We sometimes want to use a different gpgkeys_xxx for a given
protocol (for example, ldaps is handled by gpgkeys_ldap). Map
these here. */
static const char *
keyserver_typemap(const char *type)
{
if(strcmp(type,"ldap")==0)
return "ldap";
else if(strcmp(type,"ldaps")==0)
return "ldap";
else if(curl_can_handle(type))
return "curl";
else
return type;
}
#define KEYSERVER_ARGS_KEEP " -o \"%O\" \"%I\""
#define KEYSERVER_ARGS_NOKEEP " -o \"%o\" \"%i\""
static int
keyserver_spawn(int action,STRLIST list,KEYDB_SEARCH_DESC *desc,
int count,int *prog,struct keyserver_spec *keyserver)
{
int ret=0,i,gotversion=0,outofband=0;
STRLIST temp;
unsigned int maxlen,buflen;
char *command,*searchstr=NULL;
byte *line=NULL;
struct parse_options *kopts;
struct exec_info *spawn;
const char *scheme;
const char *libexecdir = get_libexecdir ();
assert(keyserver);
#ifdef EXEC_TEMPFILE_ONLY
opt.keyserver_options.options|=KEYSERVER_USE_TEMP_FILES;
#endif
/* Build the filename for the helper to execute */
scheme=keyserver_typemap(keyserver->scheme);
#ifdef DISABLE_KEYSERVER_PATH
/* Destroy any path we might have. This is a little tricky,
portability-wise. It's not correct to delete the PATH
environment variable, as that may fall back to a system built-in
PATH. Similarly, it is not correct to set PATH to the null
string (PATH="") since this actually deletes the PATH environment
variable under MinGW. The safest thing to do here is to force
PATH to be GNUPG_LIBEXECDIR. All this is not that meaningful on
Unix-like systems (since we're going to give a full path to
gpgkeys_foo), but on W32 it prevents loading any DLLs from
directories in %PATH%.
After some more thinking about this we came to the conclusion
that it is better to load the helpers from the directory where
the program of this process lives. Fortunately Windows provides
a way to retrieve this and our get_libexecdir function has been
modified to return just this. Setting the exec-path is not
anymore required.
set_exec_path(libexecdir);
*/
#else
if(opt.exec_path_set)
{
/* If exec-path was set, and DISABLE_KEYSERVER_PATH is
undefined, then don't specify a full path to gpgkeys_foo, so
that the PATH can work. */
command=m_alloc(strlen(GPGKEYS_PREFIX)+strlen(scheme)+1);
command[0]='\0';
}
else
#endif
{
/* Specify a full path to gpgkeys_foo. */
command=m_alloc(strlen(libexecdir)+strlen(DIRSEP_S)+
strlen(GPGKEYS_PREFIX)+strlen(scheme)+1);
strcpy(command,libexecdir);
strcat(command,DIRSEP_S);
}
strcat(command,GPGKEYS_PREFIX);
strcat(command,scheme);
if(opt.keyserver_options.options&KEYSERVER_USE_TEMP_FILES)
{
if(opt.keyserver_options.options&KEYSERVER_KEEP_TEMP_FILES)
{
command=m_realloc(command,strlen(command)+
strlen(KEYSERVER_ARGS_KEEP)+1);
strcat(command,KEYSERVER_ARGS_KEEP);
}
else
{
command=m_realloc(command,strlen(command)+
strlen(KEYSERVER_ARGS_NOKEEP)+1);
strcat(command,KEYSERVER_ARGS_NOKEEP);
}
ret=exec_write(&spawn,NULL,command,NULL,0,0);
}
else
ret=exec_write(&spawn,command,NULL,NULL,0,0);
m_free(command);
if(ret)
return ret;
fprintf(spawn->tochild,
"# This is a GnuPG %s keyserver communications file\n",VERSION);
fprintf(spawn->tochild,"VERSION %d\n",KEYSERVER_PROTO_VERSION);
fprintf(spawn->tochild,"PROGRAM %s\n",VERSION);
fprintf(spawn->tochild,"SCHEME %s\n",keyserver->scheme);
if(keyserver->opaque)
fprintf(spawn->tochild,"OPAQUE %s\n",keyserver->opaque);
else
{
if(keyserver->auth)
fprintf(spawn->tochild,"AUTH %s\n",keyserver->auth);
if(keyserver->host)
fprintf(spawn->tochild,"HOST %s\n",keyserver->host);
if(keyserver->port)
fprintf(spawn->tochild,"PORT %s\n",keyserver->port);
if(keyserver->path)
fprintf(spawn->tochild,"PATH %s\n",keyserver->path);
}
/* Write options */
for(i=0,kopts=keyserver_opts;kopts[i].name;i++)
if(opt.keyserver_options.options & kopts[i].bit & REMOTE_TELL)
fprintf(spawn->tochild,"OPTION %s\n",kopts[i].name);
for(temp=opt.keyserver_options.other;temp;temp=temp->next)
fprintf(spawn->tochild,"OPTION %s\n",temp->d);
switch(action)
{
case GET:
{
fprintf(spawn->tochild,"COMMAND GET\n\n");
/* Which keys do we want? */
for(i=0;i<count;i++)
{
if(desc[i].mode==KEYDB_SEARCH_MODE_FPR20)
{
int f;
fprintf(spawn->tochild,"0x");
for(f=0;f<MAX_FINGERPRINT_LEN;f++)
fprintf(spawn->tochild,"%02X",desc[i].u.fpr[f]);
fprintf(spawn->tochild,"\n");
}
else if(desc[i].mode==KEYDB_SEARCH_MODE_FPR16)
{
int f;
fprintf(spawn->tochild,"0x");
for(f=0;f<16;f++)
fprintf(spawn->tochild,"%02X",desc[i].u.fpr[f]);
fprintf(spawn->tochild,"\n");
}
else if(desc[i].mode==KEYDB_SEARCH_MODE_LONG_KID)
fprintf(spawn->tochild,"0x%08lX%08lX\n",
(ulong)desc[i].u.kid[0],
(ulong)desc[i].u.kid[1]);
else if(desc[i].mode==KEYDB_SEARCH_MODE_SHORT_KID)
fprintf(spawn->tochild,"0x%08lX\n",
(ulong)desc[i].u.kid[1]);
else if(desc[i].mode==KEYDB_SEARCH_MODE_NONE)
continue;
else
BUG();
if(keyserver->host)
log_info(_("requesting key %s from %s server %s\n"),
keystr_from_desc(&desc[i]),
keyserver->scheme,keyserver->host);
else
log_info(_("requesting key %s from %s\n"),
keystr_from_desc(&desc[i]),keyserver->uri);
}
fprintf(spawn->tochild,"\n");
break;
}
case SEND:
{
STRLIST key;
/* Note the extra \n here to send an empty keylist block */
fprintf(spawn->tochild,"COMMAND SEND\n\n\n");
for(key=list;key!=NULL;key=key->next)
{
armor_filter_context_t afx;
IOBUF buffer=iobuf_temp();
KBNODE block;
temp=NULL;
add_to_strlist(&temp,key->d);
memset(&afx,0,sizeof(afx));
afx.what=1;
/* Tell the armor filter to use Unix-style \n line
endings, since we're going to fprintf this to a file
that (on Win32) is open in text mode. The win32 stdio
will transform the \n to \r\n and we'll end up with the
proper line endings on win32. This is a no-op on
Unix. */
afx.eol[0]='\n';
iobuf_push_filter(buffer,armor_filter,&afx);
/* TODO: Remove Comment: lines from keys exported this
way? */
if(export_pubkeys_stream(buffer,temp,&block,
opt.keyserver_options.export_options)==-1)
iobuf_close(buffer);
else
{
KBNODE node;
iobuf_flush_temp(buffer);
merge_keys_and_selfsig(block);
fprintf(spawn->tochild,"INFO %08lX%08lX BEGIN\n",
(ulong)block->pkt->pkt.public_key->keyid[0],
(ulong)block->pkt->pkt.public_key->keyid[1]);
for(node=block;node;node=node->next)
{
switch(node->pkt->pkttype)
{
default:
continue;
case PKT_PUBLIC_KEY:
case PKT_PUBLIC_SUBKEY:
{
PKT_public_key *pk=node->pkt->pkt.public_key;
keyid_from_pk(pk,NULL);
fprintf(spawn->tochild,"%sb:%08lX%08lX:%u:%u:%u:%u:",
node->pkt->pkttype==PKT_PUBLIC_KEY?"pu":"su",
(ulong)pk->keyid[0],(ulong)pk->keyid[1],
pk->pubkey_algo,
nbits_from_pk(pk),
pk->timestamp,
pk->expiredate);
if(pk->is_revoked)
fprintf(spawn->tochild,"r");
if(pk->has_expired)
fprintf(spawn->tochild,"e");
fprintf(spawn->tochild,"\n");
}
break;
case PKT_USER_ID:
{
PKT_user_id *uid=node->pkt->pkt.user_id;
int r;
if(uid->attrib_data)
continue;
fprintf(spawn->tochild,"uid:");
/* Quote ':', '%', and any 8-bit
characters */
for(r=0;r<uid->len;r++)
{
if(uid->name[r]==':' || uid->name[r]=='%'
|| uid->name[r]&0x80)
fprintf(spawn->tochild,"%%%02X",
(byte)uid->name[r]);
else
fprintf(spawn->tochild,"%c",uid->name[r]);
}
fprintf(spawn->tochild,":%u:%u:",
uid->created,uid->expiredate);
if(uid->is_revoked)
fprintf(spawn->tochild,"r");
if(uid->is_expired)
fprintf(spawn->tochild,"e");
fprintf(spawn->tochild,"\n");
}
break;
/* This bit is really for the benefit of
people who store their keys in LDAP
servers. It makes it easy to do queries
for things like "all keys signed by
Isabella". */
case PKT_SIGNATURE:
{
PKT_signature *sig=node->pkt->pkt.signature;
if(!IS_UID_SIG(sig))
continue;
fprintf(spawn->tochild,"sig:%08lX%08lX:%X:%u:%u\n",
(ulong)sig->keyid[0],(ulong)sig->keyid[1],
sig->sig_class,sig->timestamp,
sig->expiredate);
}
break;
}
}
fprintf(spawn->tochild,"INFO %08lX%08lX END\n",
(ulong)block->pkt->pkt.public_key->keyid[0],
(ulong)block->pkt->pkt.public_key->keyid[1]);
fprintf(spawn->tochild,"KEY %s BEGIN\n",key->d);
fwrite(iobuf_get_temp_buffer(buffer),
iobuf_get_temp_length(buffer),1,spawn->tochild);
fprintf(spawn->tochild,"KEY %s END\n",key->d);
iobuf_close(buffer);
if(keyserver->host)
log_info(_("sending key %s to %s server %s\n"),
keystr(block->pkt->pkt.public_key->keyid),
keyserver->scheme,keyserver->host);
else
log_info(_("sending key %s to %s\n"),
keystr(block->pkt->pkt.public_key->keyid),
keyserver->uri);
release_kbnode(block);
}
free_strlist(temp);
}
break;
}
case SEARCH:
{
STRLIST key;
fprintf(spawn->tochild,"COMMAND SEARCH\n\n");
/* Which keys do we want? Remember that the gpgkeys_ program
is going to lump these together into a search string. */
for(key=list;key!=NULL;key=key->next)
{
fprintf(spawn->tochild,"%s\n",key->d);
if(key!=list)
{
searchstr=m_realloc(searchstr,
strlen(searchstr)+strlen(key->d)+2);
strcat(searchstr," ");
}
else
{
searchstr=m_alloc(strlen(key->d)+1);
searchstr[0]='\0';
}
strcat(searchstr,key->d);
}
fprintf(spawn->tochild,"\n");
if(keyserver->host)
log_info(_("searching for \"%s\" from %s server %s\n"),
searchstr,keyserver->scheme,keyserver->host);
else
log_info(_("searching for \"%s\" from %s\n"),
searchstr,keyserver->uri);
break;
}
default:
log_fatal(_("no keyserver action!\n"));
break;
}
/* Done sending, so start reading. */
ret=exec_read(spawn);
if(ret)
goto fail;
/* Now handle the response */
for(;;)
{
int plen;
char *ptr;
maxlen=1024;
if(iobuf_read_line(spawn->fromchild,&line,&buflen,&maxlen)==0)
{
ret=G10ERR_READ_FILE;
goto fail; /* i.e. EOF */
}
ptr=line;
/* remove trailing whitespace */
plen=strlen(ptr);
while(plen>0 && ascii_isspace(ptr[plen-1]))
plen--;
plen[ptr]='\0';
if(*ptr=='\0')
break;
if(ascii_strncasecmp(ptr,"VERSION ",8)==0)
{
gotversion=1;
if(atoi(&ptr[8])!=KEYSERVER_PROTO_VERSION)
{
log_error(_("invalid keyserver protocol (us %d!=handler %d)\n"),
KEYSERVER_PROTO_VERSION,atoi(&ptr[8]));
goto fail;
}
}
else if(ascii_strncasecmp(ptr,"PROGRAM ",8)==0)
{
if(ascii_strncasecmp(&ptr[8],VERSION,strlen(VERSION))!=0)
log_info(_("WARNING: keyserver handler from a different"
" version of GnuPG (%s)\n"),&ptr[8]);
}
else if(ascii_strncasecmp(ptr,"OPTION OUTOFBAND",16)==0)
outofband=1; /* Currently the only OPTION */
}
if(!gotversion)
{
log_error(_("keyserver did not send VERSION\n"));
goto fail;
}
if(!outofband)
switch(action)
{
case GET:
{
void *stats_handle;
stats_handle=import_new_stats_handle();
/* Slurp up all the key data. In the future, it might be
nice to look for KEY foo OUTOFBAND and FAILED indicators.
It's harmless to ignore them, but ignoring them does make
gpg complain about "no valid OpenPGP data found". One
way to do this could be to continue parsing this
line-by-line and make a temp iobuf for each key. */
import_keys_stream(spawn->fromchild,stats_handle,
opt.keyserver_options.import_options);
import_print_stats(stats_handle);
import_release_stats_handle(stats_handle);
break;
}
/* Nothing to do here */
case SEND:
break;
case SEARCH:
keyserver_search_prompt(spawn->fromchild,searchstr);
break;
default:
log_fatal(_("no keyserver action!\n"));
break;
}
fail:
xfree(line);
xfree(searchstr);
*prog=exec_finish(spawn);
return ret;
}
static int
keyserver_work(int action,STRLIST list,KEYDB_SEARCH_DESC *desc,
int count,struct keyserver_spec *keyserver)
{
int rc=0,ret=0;
if(!keyserver)
{
log_error(_("no keyserver known (use option --keyserver)\n"));
return G10ERR_BAD_URI;
}
#ifdef DISABLE_KEYSERVER_HELPERS
log_error(_("external keyserver calls are not supported in this build\n"));
return G10ERR_KEYSERVER;
#else
/* Spawn a handler */
rc=keyserver_spawn(action,list,desc,count,&ret,keyserver);
if(ret)
{
switch(ret)
{
case KEYSERVER_SCHEME_NOT_FOUND:
log_error(_("no handler for keyserver scheme `%s'\n"),
keyserver->scheme);
break;
case KEYSERVER_NOT_SUPPORTED:
log_error(_("action `%s' not supported with keyserver "
"scheme `%s'\n"),
action==GET?"get":action==SEND?"send":
action==SEARCH?"search":"unknown",
keyserver->scheme);
break;
case KEYSERVER_VERSION_ERROR:
log_error(_(GPGKEYS_PREFIX "%s does not support"
" handler version %d\n"),
keyserver_typemap(keyserver->scheme),
KEYSERVER_PROTO_VERSION);
break;
case KEYSERVER_TIMEOUT:
log_error(_("keyserver timed out\n"));
break;
case KEYSERVER_INTERNAL_ERROR:
default:
log_error(_("keyserver internal error\n"));
break;
}
return G10ERR_KEYSERVER;
}
if(rc)
{
log_error(_("keyserver communications error: %s\n"),g10_errstr(rc));
return rc;
}
return 0;
#endif /* ! DISABLE_KEYSERVER_HELPERS*/
}
int
keyserver_export(STRLIST users)
{
STRLIST sl=NULL;
KEYDB_SEARCH_DESC desc;
int rc=0;
/* Weed out descriptors that we don't support sending */
for(;users;users=users->next)
{
classify_user_id (users->d, &desc);
if(desc.mode!=KEYDB_SEARCH_MODE_SHORT_KID &&
desc.mode!=KEYDB_SEARCH_MODE_LONG_KID &&
desc.mode!=KEYDB_SEARCH_MODE_FPR16 &&
desc.mode!=KEYDB_SEARCH_MODE_FPR20)
{
log_error(_("\"%s\" not a key ID: skipping\n"),users->d);
continue;
}
else
append_to_strlist(&sl,users->d);
}
if(sl)
{
rc=keyserver_work(SEND,sl,NULL,0,opt.keyserver);
free_strlist(sl);
}
return rc;
}
int
keyserver_import(STRLIST users)
{
KEYDB_SEARCH_DESC *desc;
int num=100,count=0;
int rc=0;
/* Build a list of key ids */
desc=m_alloc(sizeof(KEYDB_SEARCH_DESC)*num);
for(;users;users=users->next)
{
classify_user_id (users->d, &desc[count]);
if(desc[count].mode!=KEYDB_SEARCH_MODE_SHORT_KID &&
desc[count].mode!=KEYDB_SEARCH_MODE_LONG_KID &&
desc[count].mode!=KEYDB_SEARCH_MODE_FPR16 &&
desc[count].mode!=KEYDB_SEARCH_MODE_FPR20)
{
log_error(_("\"%s\" not a key ID: skipping\n"),users->d);
continue;
}
count++;
if(count==num)
{
num+=100;
desc=m_realloc(desc,sizeof(KEYDB_SEARCH_DESC)*num);
}
}
if(count>0)
rc=keyserver_work(GET,NULL,desc,count,opt.keyserver);
m_free(desc);
return rc;
}
int
keyserver_import_fprint(const byte *fprint,size_t fprint_len,
struct keyserver_spec *keyserver)
{
KEYDB_SEARCH_DESC desc;
memset(&desc,0,sizeof(desc));
if(fprint_len==16)
desc.mode=KEYDB_SEARCH_MODE_FPR16;
else if(fprint_len==20)
desc.mode=KEYDB_SEARCH_MODE_FPR20;
else
return -1;
memcpy(desc.u.fpr,fprint,fprint_len);
return keyserver_work(GET,NULL,&desc,1,keyserver);
}
int
keyserver_import_keyid(u32 *keyid,struct keyserver_spec *keyserver)
{
KEYDB_SEARCH_DESC desc;
memset(&desc,0,sizeof(desc));
desc.mode=KEYDB_SEARCH_MODE_LONG_KID;
desc.u.kid[0]=keyid[0];
desc.u.kid[1]=keyid[1];
return keyserver_work(GET,NULL,&desc,1,keyserver);
}
/* code mostly stolen from do_export_stream */
static int
keyidlist(STRLIST users,KEYDB_SEARCH_DESC **klist,int *count,int fakev3)
{
int rc=0,ndesc,num=100;
KBNODE keyblock=NULL,node;
KEYDB_HANDLE kdbhd;
KEYDB_SEARCH_DESC *desc;
STRLIST sl;
*count=0;
*klist=m_alloc(sizeof(KEYDB_SEARCH_DESC)*num);
kdbhd=keydb_new(0);
if(!users)
{
ndesc = 1;
desc = m_alloc_clear ( ndesc * sizeof *desc);
desc[0].mode = KEYDB_SEARCH_MODE_FIRST;
}
else
{
for (ndesc=0, sl=users; sl; sl = sl->next, ndesc++)
;
desc = m_alloc ( ndesc * sizeof *desc);
for (ndesc=0, sl=users; sl; sl = sl->next)
{
if(classify_user_id (sl->d, desc+ndesc))
ndesc++;
else
log_error (_("key \"%s\" not found: %s\n"),
sl->d, g10_errstr (G10ERR_INV_USER_ID));
}
}
while (!(rc = keydb_search (kdbhd, desc, ndesc)))
{
if (!users)
desc[0].mode = KEYDB_SEARCH_MODE_NEXT;
/* read the keyblock */
rc = keydb_get_keyblock (kdbhd, &keyblock );
if( rc )
{
log_error (_("error reading keyblock: %s\n"), g10_errstr(rc) );
goto leave;
}
if((node=find_kbnode(keyblock,PKT_PUBLIC_KEY)))
{
/* This is to work around a bug in some keyservers (pksd and
OKS) that calculate v4 RSA keyids as if they were v3 RSA.
The answer is to refresh both the correct v4 keyid
(e.g. 99242560) and the fake v3 keyid (e.g. 68FDDBC7).
This only happens for key refresh using the HKP scheme
and if the refresh-add-fake-v3-keyids keyserver option is
set. */
if(fakev3 && is_RSA(node->pkt->pkt.public_key->pubkey_algo) &&
node->pkt->pkt.public_key->version>=4)
{
(*klist)[*count].mode=KEYDB_SEARCH_MODE_LONG_KID;
mpi_get_keyid(node->pkt->pkt.public_key->pkey[0],
(*klist)[*count].u.kid);
(*count)++;
if(*count==num)
{
num+=100;
*klist=m_realloc(*klist,sizeof(KEYDB_SEARCH_DESC)*num);
}
}
/* v4 keys get full fingerprints. v3 keys get long keyids.
This is because it's easy to calculate any sort of keyid
from a v4 fingerprint, but not a v3 fingerprint. */
if(node->pkt->pkt.public_key->version<4)
{
(*klist)[*count].mode=KEYDB_SEARCH_MODE_LONG_KID;
keyid_from_pk(node->pkt->pkt.public_key,
(*klist)[*count].u.kid);
}
else
{
size_t dummy;
(*klist)[*count].mode=KEYDB_SEARCH_MODE_FPR20;
fingerprint_from_pk(node->pkt->pkt.public_key,
(*klist)[*count].u.fpr,&dummy);
}
/* This is a little hackish, using the skipfncvalue as a
void* pointer to the keyserver spec, but we don't need
the skipfnc here, and it saves having an additional field
for this (which would be wasted space most of the
time). */
(*klist)[*count].skipfncvalue=NULL;
/* Are we honoring preferred keyservers? */
if(opt.keyserver_options.options&KEYSERVER_HONOR_KEYSERVER_URL)
{
PKT_user_id *uid=NULL;
PKT_signature *sig=NULL;
merge_keys_and_selfsig(keyblock);
for(node=node->next;node;node=node->next)
{
if(node->pkt->pkttype==PKT_USER_ID
&& node->pkt->pkt.user_id->is_primary)
uid=node->pkt->pkt.user_id;
else if(node->pkt->pkttype==PKT_SIGNATURE
&& node->pkt->pkt.signature->
flags.chosen_selfsig && uid)
{
sig=node->pkt->pkt.signature;
break;
}
}
/* Try and parse the keyserver URL. If it doesn't work,
then we end up writing NULL which indicates we are
the same as any other key. */
if(uid && sig)
(*klist)[*count].skipfncvalue=parse_preferred_keyserver(sig);
}
(*count)++;
if(*count==num)
{
num+=100;
*klist=m_realloc(*klist,sizeof(KEYDB_SEARCH_DESC)*num);
}
}
}
if(rc==-1)
rc=0;
leave:
if(rc)
m_free(*klist);
m_free(desc);
keydb_release(kdbhd);
release_kbnode(keyblock);
return rc;
}
/* Note this is different than the original HKP refresh. It allows
usernames to refresh only part of the keyring. */
int
keyserver_refresh(STRLIST users)
{
int rc,count,numdesc,fakev3=0;
KEYDB_SEARCH_DESC *desc;
unsigned int options=opt.keyserver_options.import_options;
/* We switch merge-only on during a refresh, as 'refresh' should
never import new keys, even if their keyids match. */
opt.keyserver_options.import_options|=IMPORT_MERGE_ONLY;
/* Similarly, we switch on fast-import, since refresh may make
multiple import sets (due to preferred keyserver URLs). We don't
want each set to rebuild the trustdb. Instead we do it once at
the end here. */
opt.keyserver_options.import_options|=IMPORT_FAST;
/* If refresh_add_fake_v3_keyids is on and it's a HKP or MAILTO
scheme, then enable fake v3 keyid generation. */
if((opt.keyserver_options.options&KEYSERVER_ADD_FAKE_V3) && opt.keyserver
&& (ascii_strcasecmp(opt.keyserver->scheme,"hkp")==0 ||
ascii_strcasecmp(opt.keyserver->scheme,"mailto")==0))
fakev3=1;
rc=keyidlist(users,&desc,&numdesc,fakev3);
if(rc)
return rc;
count=numdesc;
if(count>0)
{
int i;
/* Try to handle preferred keyserver keys first */
for(i=0;i<count;i++)
{
if(desc[i].skipfncvalue)
{
struct keyserver_spec *keyserver=desc[i].skipfncvalue;
/* We use the keyserver structure we parsed out before.
Note that a preferred keyserver without a scheme://
will be interpreted as hkp:// */
rc=keyserver_work(GET,NULL,&desc[i],1,keyserver);
if(rc)
log_info(_("WARNING: unable to refresh key %s"
" via %s: %s\n"),keystr_from_desc(&desc[i]),
keyserver->uri,g10_errstr(rc));
else
{
/* We got it, so mark it as NONE so we don't try and
get it again from the regular keyserver. */
desc[i].mode=KEYDB_SEARCH_MODE_NONE;
count--;
}
free_keyserver_spec(keyserver);
}
}
}
if(count>0)
{
if(opt.keyserver)
{
if(count==1)
log_info(_("refreshing 1 key from %s\n"),opt.keyserver->uri);
else
log_info(_("refreshing %d keys from %s\n"),
count,opt.keyserver->uri);
}
rc=keyserver_work(GET,NULL,desc,numdesc,opt.keyserver);
}
m_free(desc);
opt.keyserver_options.import_options=options;
/* If the original options didn't have fast import, and the trustdb
is dirty, rebuild. */
if(!(opt.keyserver_options.import_options&IMPORT_FAST))
trustdb_check_or_update();
return rc;
}
int
keyserver_search(STRLIST tokens)
{
if(tokens)
return keyserver_work(SEARCH,tokens,NULL,0,opt.keyserver);
else
return 0;
}
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