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Try a DNS-SD lookup to find a domain-specific LDAP server before

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resorting to keys.{domain}.
This commit is contained in:
David Shaw 2009-07-23 18:28:54 +00:00
parent 830dae2873
commit ab9a918bc2
4 changed files with 63 additions and 15 deletions
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5
doc/ChangeLog
View File

@ -1,3 +1,8 @@
2009-07-23 David Shaw <dshaw@jabberwocky.com>
* gpg.texi (GPG Configuration Options): LDAP uses DNS-SD to locate
a server before falling back to keys.{domain}.
2009-07-23 Werner Koch <wk@g10code.com>
* help.txt (gpgsm.crl-problem): New.

5
doc/gpg.texi
View File

@ -1376,8 +1376,9 @@ Locate a key using DNS CERT, as specified in rfc4398.
Locate a key using DNS PKA.
@item ldap
Locate a key using the PGP Universal method of checking
@samp{ldap://keys.(thedomain)}.
Using DNS Service Discovery, check the domain in question for any LDAP
keyservers to use. If this fails, attempt to locate the key using the
PGP Universal method of checking @samp{ldap://keys.(thedomain)}.
@item keyserver
Locate a key using whatever keyserver is defined using the

5
g10/ChangeLog
View File

@ -1,3 +1,8 @@
2009-07-23 David Shaw <dshaw@jabberwocky.com>
* keyserver.c (keyserver_import_ldap): Try a DNS-SD lookup to find
a domain-specific LDAP server before resorting to keys.{domain}.
2009-07-22 Werner Koch <wk@g10code.com>
* card-util.c (generate_card_keys): Ask for off-card keys only if

63
g10/keyserver.c
View File

@ -42,6 +42,9 @@
#include "util.h"
#include "dns-cert.h"
#include "pka.h"
#ifdef USE_DNS_SRV
#include "srv.h"
#endif
#ifdef HAVE_W32_SYSTEM
/* It seems Vista doesn't grok X_OK and so fails access() tests.
@ -2125,17 +2128,19 @@ keyserver_import_name(const char *name,unsigned char **fpr,size_t *fpr_len,
return rc;
}
/* Use the PGP Universal trick of asking ldap://keys.(maildomain) for
the key. */
/* Import a key by name using LDAP */
int
keyserver_import_ldap(const char *name,unsigned char **fpr,size_t *fpr_len)
{
char *domain;
struct keyserver_spec *keyserver;
strlist_t list=NULL;
int rc;
append_to_strlist(&list,name);
int rc,hostlen=1;
#ifdef USE_DNS_SRV
struct srventry *srvlist=NULL;
int srvcount,i;
char srvname[MAXDNAME];
#endif
/* Parse out the domain */
domain=strrchr(name,'@');
@ -2145,16 +2150,48 @@ keyserver_import_ldap(const char *name,unsigned char **fpr,size_t *fpr_len)
domain++;
keyserver=xmalloc_clear(sizeof(struct keyserver_spec));
keyserver->scheme=xstrdup("ldap");
keyserver->host=xmalloc(5+strlen(domain)+1);
strcpy(keyserver->host,"keys.");
keyserver->host=xmalloc(1);
keyserver->host[0]='\0';
#ifdef USE_DNS_SRV
snprintf(srvname,MAXDNAME,"_pgpkey-ldap._tcp.%s",domain);
srvcount=getsrv(srvname,&srvlist);
for(i=0;i<srvcount;i++)
{
hostlen+=strlen(srvlist[i].target)+1;
keyserver->host=xrealloc(keyserver->host,hostlen);
strcat(keyserver->host,srvlist[i].target);
if(srvlist[i].port!=389)
{
char port[7];
hostlen+=6; /* a colon, plus 5 digits (unsigned 16-bit value) */
keyserver->host=xrealloc(keyserver->host,hostlen);
snprintf(port,7,":%u",srvlist[i].port);
strcat(keyserver->host,port);
}
strcat(keyserver->host," ");
}
free(srvlist);
#endif
/* If all else fails, do the PGP Universal trick of
ldap://keys.(domain) */
hostlen+=5+strlen(domain);
keyserver->host=xrealloc(keyserver->host,hostlen);
strcat(keyserver->host,"keys.");
strcat(keyserver->host,domain);
keyserver->uri=xmalloc(strlen(keyserver->scheme)+
3+strlen(keyserver->host)+1);
strcpy(keyserver->uri,keyserver->scheme);
strcat(keyserver->uri,"://");
strcat(keyserver->uri,keyserver->host);
append_to_strlist(&list,name);
rc=keyserver_work(KS_GETNAME,list,NULL,0,fpr,fpr_len,keyserver);