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Enhanced --auto-key-locate.

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This commit is contained in:
Werner Koch 2008-04-08 11:04:16 +00:00
parent 7707a7e5f8
commit 97ec9aac2b
14 changed files with 226 additions and 96 deletions
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5
NEWS
View File

@ -1,6 +1,11 @@
Noteworthy changes in version 2.0.10 (unreleased)
-------------------------------------------------
* New keyserver helper gpg2keys_kdns as generic DNS CERT lookup. Run
with --help for a short description. Requires the ADNS library.
* New mechanisms "local" and "nodefault" for --auto-key-locate [gpg].
Fixed a few problems with this option.
Noteworthy changes in version 2.0.9 (2008-03-26)

6
doc/ChangeLog
View File

@ -1,3 +1,9 @@
2008-04-08 Werner Koch <wk@g10code.com>
* gpg.texi (GPG Configuration Options): Change subkeys.pgp.net to
keys.gnupg.net. Describe --auto-key-locate mechanisms local and
nodefault.
2008-04-03 Werner Koch <wk@g10code.com>
* yat2m.c (proc_texi_cmd): Remove extra apostrophe from @samp and

33
doc/gpg.texi
View File

@ -1306,27 +1306,40 @@ GnuPG can automatically locate and retrieve keys as needed using this
option. This happens when encrypting to an email address (in the
"user@@example.com" form), and there are no user@@example.com keys on
the local keyring. This option takes any number of the following
arguments, in the order they are to be tried:
mechanisms, in the order they are to be tried:
@table @asis
@item cert
locate a key using DNS CERT, as specified in rfc4398.
Locate a key using DNS CERT, as specified in rfc4398.
@item pka
locate a key using DNS PKA.
Locate a key using DNS PKA.
@item ldap
locate a key using the PGP Universal method of checking
"ldap://keys.(thedomain)".
Locate a key using the PGP Universal method of checking
@samp{ldap://keys.(thedomain)}.
@item keyserver
locate a key using whatever keyserver is defined using the
Locate a key using whatever keyserver is defined using the
@option{--keyserver} option.
@item (keyserver URL)
In addition, a keyserver URL as used in the @option{--keyserver} option may be
used here to query that particular keyserver.
@item keyserver-URL
In addition, a keyserver URL as used in the @option{--keyserver} option
may be used here to query that particular keyserver.
@item local
Locate the key using the local keyrings. This mechanism allows to
select the order a local key lookup is done. Thus using
@samp{--auto-key-locate local} is identical to
@option{--no-auto-key-locate}.
@item nodefault
This flag disables the standard local key lookup, done before any of the
mechanisms defined by the @option{--auto-key-locate} are tried. The
position of this mechanism in the list does not matter. It is not
required if @code{local} is also used.
@end table
@item --keyid-format @code{short|0xshort|long|0xlong}
@ -1351,7 +1364,7 @@ from below, but apply only to this particular keyserver.
Most keyservers synchronize with each other, so there is generally no
need to send keys to more than one server. The keyserver
@code{hkp://subkeys.pgp.net} uses round robin DNS to give a different
@code{hkp://keys.gnupg.net} uses round robin DNS to give a different
keyserver each time you use it.
@item --keyserver-options @code{name=value1 }

19
g10/ChangeLog
View File

@ -1,3 +1,20 @@
2008-04-08 Werner Koch <wk@g10code.com>
* options.h (opt): Add AKL_NODEFAULT and AKL_LOCAL.
* getkey.c (parse_auto_key_locate): Parse them.
(get_pubkey_byname): Implement them. Add arg NO_AKL and use that
in all cases where a local key is expected.
* import.c (import_one): Fill in the fingerprint in all cases.
Use log_get_stream.
* keyserver.c (keyserver_import_pka): Set FPR to NULL on error.
Return G10ERR_NO_PUBKEY if no PKA info is available or no key URI
is given in the PKA record..
(keyserver_import_cert): Return G10ERR_NO_PUBKEY if a CERT record
was not found.
* getkey.c (get_pubkey_byname): Release FPR in the error case.
Continue with next mechanism on error. Better diagnostics.
2008-04-07 Werner Koch <wk@g10code.com>
* keyserver.c (parse_keyserver_uri): Allow a default host name.
@ -10121,7 +10138,7 @@ Thu Feb 12 22:24:42 1998 Werner Koch (wk@frodo)
Copyright 1998,1999,2000,2001,2002,2003,2004,2005,
2006,2007 Free Software Foundation, Inc.
2006,2007,2008 Free Software Foundation, Inc.
This file is free software; as a special exception the author gives
unlimited permission to copy and/or distribute it, with or without

122
g10/getkey.c
View File

@ -1,6 +1,6 @@
/* getkey.c - Get a key from the database
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
* 2006, 2007 Free Software Foundation, Inc.
* 2006, 2007, 2008 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
@ -912,64 +912,91 @@ key_byname( GETKEY_CTX *retctx, strlist_t namelist,
/* Find a public key from NAME and return the keyblock or the key. If
ret_kdb is not NULL, the KEYDB handle used to locate this keyblock
is returned and the caller is responsible for closing it. If a key
was not found and NAME is a valid RFC822 mailbox and --auto-key-locate
has been enabled, we try to import the key via the online mechanisms
defined by --auto-key-locate. */
was not found (or if local search has been disabled) and NAME is a
valid RFC822 mailbox and --auto-key-locate has been enabled, we try
to import the key via the online mechanisms defined by
--auto-key-locate. */
int
get_pubkey_byname (PKT_public_key *pk,
const char *name, KBNODE *ret_keyblock,
KEYDB_HANDLE *ret_kdbhd, int include_unusable )
KEYDB_HANDLE *ret_kdbhd, int include_unusable,
int no_akl)
{
int rc;
strlist_t namelist = NULL;
struct akl *akl;
int nodefault = 0;
add_to_strlist( &namelist, name );
/* Check whether we the default local search has been disabled.
This is the case if either the "nodefault" or the "local" keyword
are in the list of auto key locate mechanisms. */
if (!no_akl)
{
for (akl=opt.auto_key_locate; akl; akl=akl->next)
if (akl->type == AKL_NODEFAULT || akl->type == AKL_LOCAL)
{
nodefault = 1;
break;
}
}
rc = key_byname( NULL, namelist, pk, NULL, 0,
if (nodefault)
rc = G10ERR_NO_PUBKEY;
else
{
add_to_strlist (&namelist, name);
rc = key_byname (NULL, namelist, pk, NULL, 0,
include_unusable, ret_keyblock, ret_kdbhd);
}
/* If the requested name resembles a valid mailbox and automatic
retrieval has been enabled, we try to import the key. */
if (rc == G10ERR_NO_PUBKEY && is_valid_mailbox(name))
if (rc == G10ERR_NO_PUBKEY && !no_akl && is_valid_mailbox(name))
{
struct akl *akl;
for(akl=opt.auto_key_locate;akl;akl=akl->next)
for (akl=opt.auto_key_locate; akl; akl=akl->next)
{
unsigned char *fpr=NULL;
unsigned char *fpr = NULL;
size_t fpr_len;
int did_key_byname = 0;
int no_fingerprint = 0;
const char *mechanism = "?";
switch(akl->type)
{
case AKL_NODEFAULT:
/* This is a dummy mechanism. */
mechanism = "None";
rc = G10ERR_NO_PUBKEY;
break;
case AKL_LOCAL:
mechanism = "Local";
did_key_byname = 1;
add_to_strlist (&namelist, name);
rc = key_byname (NULL, namelist, pk, NULL, 0,
include_unusable, ret_keyblock, ret_kdbhd);
break;
case AKL_CERT:
mechanism = "DNS CERT";
glo_ctrl.in_auto_key_retrieve++;
rc=keyserver_import_cert(name,&fpr,&fpr_len);
glo_ctrl.in_auto_key_retrieve--;
if(rc==0)
log_info(_("automatically retrieved `%s' via %s\n"),
name,"DNS CERT");
break;
case AKL_PKA:
mechanism = "PKA";
glo_ctrl.in_auto_key_retrieve++;
rc=keyserver_import_pka(name,&fpr,&fpr_len);
glo_ctrl.in_auto_key_retrieve--;
if(rc==0)
log_info(_("automatically retrieved `%s' via %s\n"),
name,"PKA");
break;
case AKL_LDAP:
mechanism = "LDAP";
glo_ctrl.in_auto_key_retrieve++;
rc=keyserver_import_ldap(name,&fpr,&fpr_len);
glo_ctrl.in_auto_key_retrieve--;
if(rc==0)
log_info(_("automatically retrieved `%s' via %s\n"),
name,"LDAP");
break;
case AKL_KEYSERVER:
@ -979,13 +1006,15 @@ get_pubkey_byname (PKT_public_key *pk,
and getting a whole lot of keys back. */
if(opt.keyserver)
{
mechanism = opt.keyserver->uri;
glo_ctrl.in_auto_key_retrieve++;
rc=keyserver_import_name(name,&fpr,&fpr_len,opt.keyserver);
glo_ctrl.in_auto_key_retrieve--;
if(rc==0)
log_info(_("automatically retrieved `%s' via %s\n"),
name,opt.keyserver->uri);
}
else
{
mechanism = "Unconfigured keyserver";
rc = G10ERR_NO_PUBKEY;
}
break;
@ -993,14 +1022,11 @@ get_pubkey_byname (PKT_public_key *pk,
{
struct keyserver_spec *keyserver;
mechanism = akl->spec->uri;
keyserver=keyserver_match(akl->spec);
glo_ctrl.in_auto_key_retrieve++;
rc=keyserver_import_name(name,&fpr,&fpr_len,keyserver);
glo_ctrl.in_auto_key_retrieve--;
if(rc==0)
log_info(_("automatically retrieved `%s' via %s\n"),
name,akl->spec->uri);
}
break;
}
@ -1027,15 +1053,30 @@ get_pubkey_byname (PKT_public_key *pk,
log_info("auto-key-locate found fingerprint %s\n",fpr_string);
add_to_strlist( &namelist, fpr_string );
xfree(fpr);
}
else if (!rc && !fpr && !did_key_byname)
{
no_fingerprint = 1;
rc = G10ERR_NO_PUBKEY;
}
xfree (fpr);
fpr = NULL;
rc = key_byname( NULL, namelist, pk, NULL, 0,
if (!rc && !did_key_byname)
rc = key_byname (NULL, namelist, pk, NULL, 0,
include_unusable, ret_keyblock, ret_kdbhd);
if(rc!=G10ERR_NO_PUBKEY)
if (!rc)
{
/* Key found. */
log_info (_("automatically retrieved `%s' via %s\n"),
name, mechanism);
break;
}
if (rc != G10ERR_NO_PUBKEY || opt.verbose || no_fingerprint)
log_info (_("error retrieving `%s' via %s: %s\n"),
name, mechanism,
no_fingerprint? _("No fingerprint"):g10_errstr(rc));
}
}
free_strlist( namelist );
@ -2638,7 +2679,7 @@ lookup( GETKEY_CTX ctx, KBNODE *ret_keyblock, int secmode )
rc = 0;
while (!(rc = keydb_search (ctx->kr_handle, ctx->items, ctx->nitems))) {
/* If we are searching for the first key we have to make sure
that the next interation does not no an implicit reset.
that the next iteration does not do an implicit reset.
This can be triggered by an empty key ring. */
if (ctx->nitems && ctx->items->mode == KEYDB_SEARCH_MODE_FIRST)
ctx->items->mode = KEYDB_SEARCH_MODE_NEXT;
@ -2949,6 +2990,7 @@ release_akl(void)
}
}
/* Returns false on error. */
int
parse_auto_key_locate(char *options)
{
@ -2964,7 +3006,11 @@ parse_auto_key_locate(char *options)
akl=xmalloc_clear(sizeof(*akl));
if(ascii_strcasecmp(tok,"ldap")==0)
if(ascii_strcasecmp(tok,"nodefault")==0)
akl->type=AKL_NODEFAULT;
else if(ascii_strcasecmp(tok,"local")==0)
akl->type=AKL_LOCAL;
else if(ascii_strcasecmp(tok,"ldap")==0)
akl->type=AKL_LDAP;
else if(ascii_strcasecmp(tok,"keyserver")==0)
akl->type=AKL_KEYSERVER;

3
g10/gpg.c
View File

@ -704,6 +704,7 @@ static ARGPARSE_OPTS opts[] = {
I'm returning the favor. */
{ oLocalUser, "sign-with", 2, "@" },
{ oRecipient, "user", 2, "@" },
{ oRequireCrossCert, "require-backsigs", 0, "@"},
{ oRequireCrossCert, "require-cross-certification", 0, "@"},
{ oNoRequireCrossCert, "no-require-backsigs", 0, "@"},
@ -1549,6 +1550,8 @@ gpgconf_list (const char *configfile)
printf ("reader-port:%lu:\n", GC_OPT_FLAG_NONE);
printf ("default-key:%lu:\n", GC_OPT_FLAG_NONE);
printf ("encrypt-to:%lu:\n", GC_OPT_FLAG_NONE);
printf ("auto-key-locate:%lu:\n", GC_OPT_FLAG_NONE);
printf ("allow-pka-lookup:%lu:\n", GC_OPT_FLAG_NONE);
xfree (configfile_esc);
}

55
g10/import.c
View File

@ -682,7 +682,7 @@ check_prefs(KBNODE keyblock)
* Try to import one keyblock. Return an error only in serious cases, but
* never for an invalid keyblock. It uses log_error to increase the
* internal errorcount, so that invalid input can be detected by programs
* which called g10.
* which called gpg.
*/
static int
import_one( const char *fname, KBNODE keyblock, struct stats_s *stats,
@ -697,6 +697,7 @@ import_one( const char *fname, KBNODE keyblock, struct stats_s *stats,
int rc = 0;
int new_key = 0;
int mod_key = 0;
int same_key = 0;
int non_self = 0;
/* get the key and print some info about it */
@ -715,12 +716,14 @@ import_one( const char *fname, KBNODE keyblock, struct stats_s *stats,
nbits_from_pk( pk ),
pubkey_letter( pk->pubkey_algo ),
keystr_from_pk(pk), datestr_from_pk(pk) );
if( uidnode )
print_utf8_string( stderr, uidnode->pkt->pkt.user_id->name,
if (uidnode)
print_utf8_string (log_get_stream (),
uidnode->pkt->pkt.user_id->name,
uidnode->pkt->pkt.user_id->len );
log_printf ("\n");
}
if( !uidnode )
{
log_error( _("key %s: no user ID\n"), keystr_from_pk(pk));
@ -958,6 +961,7 @@ import_one( const char *fname, KBNODE keyblock, struct stats_s *stats,
}
else
{
same_key = 1;
if (is_status_enabled ())
print_import_ok (pk, NULL, 0);
@ -975,6 +979,33 @@ import_one( const char *fname, KBNODE keyblock, struct stats_s *stats,
}
leave:
if (mod_key || new_key || same_key)
{
/* A little explanation for this: we fill in the fingerprint
when importing keys as it can be useful to know the
fingerprint in certain keyserver-related cases (a keyserver
asked for a particular name, but the key doesn't have that
name). However, in cases where we're importing more than
one key at a time, we cannot know which key to fingerprint.
In these cases, rather than guessing, we do not
fingerprinting at all, and we must hope the user ID on the
keys are useful. Note that we need to do this for new
keys, merged keys and even for unchanged keys. This is
required because for example the --auto-key-locate feature
may import an already imported key and needs to know the
fingerprint of the key in all cases. */
if (fpr)
{
xfree (*fpr);
/* Note that we need to compare against 0 here because
COUNT gets only incremented after returning form this
function. */
if (stats->count == 0)
*fpr = fingerprint_from_pk (pk, NULL, fpr_len);
else
*fpr = NULL;
}
}
/* Now that the key is definitely incorporated into the keydb, we
need to check if a designated revocation is present or if the
@ -988,24 +1019,6 @@ import_one( const char *fname, KBNODE keyblock, struct stats_s *stats,
}
else if(new_key)
{
/* A little explanation for this: we fill in the fingerprint
when importing keys as it can be useful to know the
fingerprint in certain keyserver-related cases (a keyserver
asked for a particular name, but the key doesn't have that
name). However, in cases where we're importing more than
one key at a time, we cannot know which key to fingerprint.
In these cases, rather than guessing, we do not fingerpring
at all, and we must hope the user ID on the keys are
useful. */
if(fpr)
{
xfree(*fpr);
if(stats->imported==1)
*fpr=fingerprint_from_pk(pk,NULL,fpr_len);
else
*fpr=NULL;
}
revocation_present(keyblock);
if(!from_sk && seckey_available(keyid)==0)
check_prefs(keyblock);

2
g10/keydb.h
View File

@ -223,7 +223,7 @@ int get_pubkey_fast ( PKT_public_key *pk, u32 *keyid );
KBNODE get_pubkeyblock( u32 *keyid );
int get_pubkey_byname( PKT_public_key *pk, const char *name,
KBNODE *ret_keyblock, KEYDB_HANDLE *ret_kdbhd,
int include_unusable );
int include_unusable, int no_akl );
int get_pubkey_bynames( GETKEY_CTX *rx, PKT_public_key *pk,
strlist_t names, KBNODE *ret_keyblock );
int get_pubkey_next( GETKEY_CTX ctx, PKT_public_key *pk, KBNODE *ret_keyblock );

4
g10/keyedit.c
View File

@ -1544,7 +1544,7 @@ keyedit_menu( const char *username, strlist_t locusr,
#endif
/* Get the public key */
rc = get_pubkey_byname (NULL, username, &keyblock, &kdbhd, 1);
rc = get_pubkey_byname (NULL, username, &keyblock, &kdbhd, 1, 1);
if( rc )
goto leave;
if( fix_keyblock( keyblock ) )
@ -3396,7 +3396,7 @@ menu_addrevoker( KBNODE pub_keyblock, KBNODE sec_keyblock, int sensitive )
GnuPG both can handle a designated revokation from a
subkey. */
revoker_pk->req_usage=PUBKEY_USAGE_CERT;
rc=get_pubkey_byname(revoker_pk,answer,NULL,NULL,1);
rc=get_pubkey_byname(revoker_pk,answer,NULL,NULL,1, 1);
if(rc)
{
log_error (_("key \"%s\" not found: %s\n"),answer,g10_errstr(rc));

27
g10/keyserver.c
View File

@ -1,6 +1,6 @@
/* keyserver.c - generic keyserver code
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006,
* 2007 Free Software Foundation, Inc.
* 2007, 2008 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
@ -2008,7 +2008,14 @@ keyserver_import_cert(const char *name,unsigned char **fpr,size_t *fpr_len)
*domain='.';
type=get_dns_cert(look,max_cert_size,&key,fpr,fpr_len,&url);
if(type==1)
if (!type || type == -1)
{
/* There might be an error in res_query which leads to an error
return (-1) in the case that nothing was found. Thus we take
all errors as key not found. */
rc = G10ERR_NO_PUBKEY;
}
else if (type==1)
{
int armor_status=opt.no_armor;
@ -2072,26 +2079,30 @@ int
keyserver_import_pka(const char *name,unsigned char **fpr,size_t *fpr_len)
{
char *uri;
int rc=-1;
int rc = G10ERR_NO_PUBKEY;
*fpr=xmalloc(20);
*fpr_len=20;
*fpr = xmalloc (20);
*fpr_len = 20;
uri = get_pka_info (name, *fpr);
if (uri)
if (uri && *uri)
{
/* An URI is available. Lookup the key. */
struct keyserver_spec *spec;
spec = parse_keyserver_uri (uri, 1, NULL, 0);
if (spec)
{
rc=keyserver_import_fprint (*fpr, 20, spec);
rc = keyserver_import_fprint (*fpr, 20, spec);
free_keyserver_spec (spec);
}
xfree (uri);
}
if(rc!=0)
if (rc)
{
xfree(*fpr);
*fpr = NULL;
}
return rc;
}

10
g10/options.h
View File

@ -235,7 +235,15 @@ struct
keyring. */
struct akl
{
enum {AKL_CERT, AKL_PKA, AKL_LDAP, AKL_KEYSERVER, AKL_SPEC} type;
enum {
AKL_NODEFAULT,
AKL_LOCAL,
AKL_CERT,
AKL_PKA,
AKL_LDAP,
AKL_KEYSERVER,
AKL_SPEC
} type;
struct keyserver_spec *spec;
struct akl *next;
} *auto_key_locate;

13
g10/pkclist.c
View File

@ -824,8 +824,9 @@ build_pk_list( strlist_t rcpts, PK_LIST *ret_pk_list, unsigned int use )
pk->req_usage = use;
/* We explicitly allow encrypt-to to an disabled key; thus
we pass 1 as last argument. */
if ( (rc = get_pubkey_byname ( pk, rov->d, NULL, NULL, 1 )) )
we pass 1for the second last argument and 1 as the last
argument to disable AKL. */
if ( (rc = get_pubkey_byname (pk, rov->d, NULL, NULL, 1, 1)) )
{
free_public_key ( pk ); pk = NULL;
log_error (_("%s: skipped: %s\n"), rov->d, g10_errstr(rc) );
@ -964,7 +965,7 @@ build_pk_list( strlist_t rcpts, PK_LIST *ret_pk_list, unsigned int use )
free_public_key (pk);
pk = xmalloc_clear( sizeof *pk );
pk->req_usage = use;
rc = get_pubkey_byname( pk, answer, NULL, NULL, 0 );
rc = get_pubkey_byname( pk, answer, NULL, NULL, 0, 0 );
if (rc)
tty_printf(_("No such user ID.\n"));
else if ( !(rc=openpgp_pk_test_algo2 (pk->pubkey_algo, use)) )
@ -1037,8 +1038,8 @@ build_pk_list( strlist_t rcpts, PK_LIST *ret_pk_list, unsigned int use )
pk->req_usage = use;
/* The default recipient is allowed to be disabled; thus pass 1
as last argument. */
rc = get_pubkey_byname (pk, def_rec, NULL, NULL, 1);
as second last argument. We also don't want an AKL. */
rc = get_pubkey_byname (pk, def_rec, NULL, NULL, 1, 1);
if (rc)
log_error(_("unknown default recipient \"%s\"\n"), def_rec );
else if ( !(rc=openpgp_pk_test_algo2(pk->pubkey_algo, use)) )
@ -1078,7 +1079,7 @@ build_pk_list( strlist_t rcpts, PK_LIST *ret_pk_list, unsigned int use )
pk = xmalloc_clear( sizeof *pk );
pk->req_usage = use;
if ( (rc = get_pubkey_byname( pk, remusr->d, NULL, NULL, 0 )) )
if ( (rc = get_pubkey_byname( pk, remusr->d, NULL, NULL, 0, 0 )) )
{
/* Key not found or other error. */
free_public_key( pk ); pk = NULL;

4
tools/ChangeLog
View File

@ -1,3 +1,7 @@
2008-04-08 Werner Koch <wk@g10code.com>
* gpgconf-comp.c (gc_options_gpg): Add --auto-key-locate.
2008-03-26 Werner Koch <wk@g10code.com>
* make-dns-cert.c: Include unistd.h. Use config.h if requested.

3
tools/gpgconf-comp.c
View File

@ -681,6 +681,9 @@ static gc_option_t gc_options_gpg[] =
{ "allow-pka-lookup", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
"gnupg", N_("allow PKA lookups (DNS requests)"),
GC_ARG_TYPE_NONE, GC_BACKEND_GPG },
{ "auto-key-locate", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
"gnupg", N_("|MECHANISMS|use MECHANISMS to locate keys by mail address"),
GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
GC_OPTION_NULL