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gpg: Lookup a missing public key of the current card via LDAP.

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* g10/getkey.c (get_seckey_default_or_card): Lookup a missing public
key from the current card via LDAP.
* g10/call-dirmngr.c: Include keyserver-intetnal.h.
(gpg_dirmngr_ks_get): Rename arg quick into flags.  Take care of the
new LDAP flag.
* g10/keyserver-internal.h (KEYSERVER_IMPORT_FLAG_QUICK): New.
Replace the use of the value 1 for the former quick arg.
(KEYSERVER_IMPORT_FLAG_LDAP): New.
* g10/keyserver.c (keyserver_get_chunk): Increase the reserved line
length.
* dirmngr/ks-action.c (ks_action_get): Add arg ldap_only.
* dirmngr/server.c (cmd_ks_get): Add option --ldap.
--

This change makes it easy to start working with gnupg: Just insert the
smartcard or token provided to you and the first time you sign a
message the public key associated with the current card will be
imported and everything is set without any configuration.

This works only with an LDAP directory because it can be expected that
the public key has been put into the LDAP during card personalization.
Of course an LDAP server needs to be configured; in a Windows AD
domain this can be a mere "keyserver ldap:///" in dirmngr.conf.  Other
configured keyservers are ignored.

Requirements for the card driver: The $SIGNKEYID attribute must exists
and a query for the KEY-FPR attribute needs to return the OpenPGP
fingerprint for that key.  This is currently supported for OpenPGP
cards and certain PKCS#15 cards.

Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit d7e707170f)
This commit is contained in:
Werner Koch 2021-04-16 20:21:23 +02:00
parent 79f5ffb1ad
commit b59af0e2a0
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
11 changed files with 89 additions and 41 deletions
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10
dirmngr/server.c
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@ -2403,11 +2403,12 @@ cmd_ks_search (assuan_context_t ctx, char *line)
static const char hlp_ks_get[] =
"KS_GET {<pattern>}\n"
"KS_GET [--quick] [--ldap] {<pattern>}\n"
"\n"
"Get the keys matching PATTERN from the configured OpenPGP keyservers\n"
"(see command KEYSERVER). Each pattern should be a keyid, a fingerprint,\n"
"or an exact name indicated by the '=' prefix.";
"or an exact name indicated by the '=' prefix. Option --quick uses a\n"
"shorter timeout; --ldap will use only ldap servers";
static gpg_error_t
cmd_ks_get (assuan_context_t ctx, char *line)
{
@ -2416,9 +2417,11 @@ cmd_ks_get (assuan_context_t ctx, char *line)
strlist_t list, sl;
char *p;
estream_t outfp;
int ldap_only;
if (has_option (line, "--quick"))
ctrl->timeout = opt.connect_quick_timeout;
ldap_only = has_option (line, "--ldap");
line = skip_options (line);
/* Break the line into a strlist. Each pattern is by
@ -2460,7 +2463,8 @@ cmd_ks_get (assuan_context_t ctx, char *line)
ctrl->server_local->inhibit_data_logging = 1;
ctrl->server_local->inhibit_data_logging_now = 0;
ctrl->server_local->inhibit_data_logging_count = 0;
err = ks_action_get (ctrl, ctrl->server_local->keyservers, list, outfp);
err = ks_action_get (ctrl, ctrl->server_local->keyservers,
list, ldap_only, outfp);
es_fclose (outfp);
ctrl->server_local->inhibit_data_logging = 0;
}