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gpg: Allow fingerprint based lookup with --locate-external-key.
* g10/keyserver.c (keyserver_import_fprint_ntds): New. * g10/getkey.c (get_pubkey_byname): Detect an attempt to search by fingerprint in no_local mode. -- See the man page. For testing use gpg --auto-key-locate local,wkd,keyserver --locate-external-key \ FINGERPRINT with at least one LDAP keyserver given in dirmngr.conf. On Windows "ntds" may be used instead or in addtion to "keyserver". Signed-off-by: Werner Koch <wk@gnupg.org> (cherry picked from commit ec36eca08cdbf6653e7362e8e0e6c5f2c75b4a60)
This commit is contained in:
parent
b59af0e2a0
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2af217ecd7
29
doc/gpg.texi
29
doc/gpg.texi
@ -353,13 +353,18 @@ numbers 1-9 or "T" for 10 and above to indicate trust signature levels
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@opindex locate-keys
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@opindex locate-external-keys
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Locate the keys given as arguments. This command basically uses the
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same algorithm as used when locating keys for encryption or signing
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and may thus be used to see what keys @command{@gpgname} might use.
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In particular external methods as defined by
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@option{--auto-key-locate} may be used to locate a key. Only public
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keys are listed. The variant @option{--locate-external-keys} does not
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consider a locally existing key and can thus be used to force the
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refresh of a key via the defined external methods.
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same algorithm as used when locating keys for encryption and may thus
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be used to see what keys @command{@gpgname} might use. In particular
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external methods as defined by @option{--auto-key-locate} are used to
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locate a key if the arguments comain valid mail addresses. Only
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public keys are listed.
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The variant @option{--locate-external-keys} does not consider a
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locally existing key and can thus be used to force the refresh of a
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key via the defined external methods. If a fingerprint is given and
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and the methods defined by --auto-key-locate define LDAP servers, the
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key is fetched from these resources; defined non-LDAP keyservers are
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skipped.
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@item --show-keys
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@opindex show-keys
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@ -1811,14 +1816,20 @@ list. The default is "local,wkd".
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PGP Universal method of checking @samp{ldap://keys.(thedomain)}.
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@item ntds
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Locate the key using the Active Directory (Windows only).
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Locate the key using the Active Directory (Windows only). This
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method also allows to search by fingerprint using the command
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@option{--locate-external-key}.
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@item keyserver
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Locate a key using a keyserver.
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Locate a key using a keyserver. This method also allows to search
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by fingerprint using the command @option{--locate-external-key} if
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any of the configured keyservers is an LDAP server.
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@item keyserver-URL
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In addition, a keyserver URL as used in the @command{dirmngr}
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configuration may be used here to query that particular keyserver.
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This method also allows to search by fingerprint using the command
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@option{--locate-external-key} if the URL specifies an LDAP server.
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@item local
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Locate the key using the local keyrings. This mechanism allows the user to
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@ -710,7 +710,7 @@ gpg_dirmngr_ks_get (ctrl_t ctrl, char **pattern,
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/* If we have an override keyserver we first indicate that the next
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user of the context needs to again setup the global keyservers and
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them we send the override keyserver. */
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then we send the override keyserver. */
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if (override_keyserver)
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{
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clear_context_flags (ctrl, ctx);
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182
g10/getkey.c
182
g10/getkey.c
@ -1020,10 +1020,12 @@ get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
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int rc;
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strlist_t namelist = NULL;
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struct akl *akl;
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int is_mbox;
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int is_mbox, is_fpr;
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KEYDB_SEARCH_DESC fprbuf;
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int nodefault = 0;
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int anylocalfirst = 0;
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int mechanism_type = AKL_NODEFAULT;
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size_t fprbuf_fprlen = 0;
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/* If RETCTX is not NULL, then RET_KDBHD must be NULL. */
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log_assert (retctx == NULL || ret_kdbhd == NULL);
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@ -1045,6 +1047,30 @@ get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
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is_mbox = 1;
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}
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/* If we are called due to --locate-external-key Check whether NAME
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* is a fingerprint and then try to lookup that key by configured
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* method which support lookup by fingerprint. FPRBUF carries the
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* parsed fingerpint iff IS_FPR is true. */
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is_fpr = 0;
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if (!is_mbox && mode == GET_PUBKEY_NO_LOCAL)
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{
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if (!classify_user_id (name, &fprbuf, 1)
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&& (fprbuf.mode == KEYDB_SEARCH_MODE_FPR16
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|| fprbuf.mode == KEYDB_SEARCH_MODE_FPR20
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|| fprbuf.mode == KEYDB_SEARCH_MODE_FPR))
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{
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/* Note: We should get rid of the FPR16 because we don't
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* support v3 keys anymore. However, in 2.3 the fingerprint
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* code has already been reworked and thus it is
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* questionable whether we should really tackle this here. */
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if (fprbuf.mode == KEYDB_SEARCH_MODE_FPR16)
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fprbuf_fprlen = 16;
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else
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fprbuf_fprlen = 20;
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is_fpr = 1;
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}
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}
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/* The auto-key-locate feature works as follows: there are a number
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* of methods to look up keys. By default, the local keyring is
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* tried first. Then, each method listed in the --auto-key-locate is
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@ -1122,7 +1148,7 @@ get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
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retrieval has been enabled, we try to import the key. */
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if (gpg_err_code (rc) == GPG_ERR_NO_PUBKEY
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&& mode != GET_PUBKEY_NO_AKL
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&& is_mbox)
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&& (is_mbox || is_fpr))
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{
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/* NAME wasn't present in the local keyring (or we didn't try
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* the local keyring). Since the auto key locate feature is
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@ -1148,6 +1174,8 @@ get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
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case AKL_LOCAL:
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if (mode == GET_PUBKEY_NO_LOCAL)
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{
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/* Note that we get here in is_fpr more, so there is
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* no extra check for it required. */
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mechanism_string = "";
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rc = GPG_ERR_NO_PUBKEY;
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}
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@ -1168,44 +1196,88 @@ get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
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break;
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case AKL_CERT:
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mechanism_string = "DNS CERT";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_cert (ctrl, name, 0, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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break;
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if (is_fpr)
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{
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mechanism_string = "";
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rc = GPG_ERR_NO_PUBKEY;
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}
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else
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{
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mechanism_string = "DNS CERT";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_cert (ctrl, name, 0, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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}
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break;
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case AKL_PKA:
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mechanism_string = "PKA";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_pka (ctrl, name, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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break;
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if (is_fpr)
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{
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mechanism_string = "";
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rc = GPG_ERR_NO_PUBKEY;
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}
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else
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{
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mechanism_string = "PKA";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_pka (ctrl, name, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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}
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break;
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case AKL_DANE:
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mechanism_string = "DANE";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_cert (ctrl, name, 1, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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if (is_fpr)
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{
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mechanism_string = "";
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rc = GPG_ERR_NO_PUBKEY;
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}
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else
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{
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mechanism_string = "DANE";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_cert (ctrl, name, 1, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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}
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break;
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case AKL_WKD:
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mechanism_string = "WKD";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_wkd (ctrl, name, 0, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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if (is_fpr)
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{
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mechanism_string = "";
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rc = GPG_ERR_NO_PUBKEY;
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}
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else
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{
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mechanism_string = "WKD";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_wkd (ctrl, name, 0, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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}
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break;
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case AKL_LDAP:
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mechanism_string = "LDAP";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_ldap (ctrl, name, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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break;
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if (is_fpr)
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{
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mechanism_string = "";
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rc = GPG_ERR_NO_PUBKEY;
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}
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else
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{
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mechanism_string = "LDAP";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_ldap (ctrl, name, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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}
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break;
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case AKL_NTDS:
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mechanism_string = "NTDS";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_ntds (ctrl, name, &fpr, &fpr_len);
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if (is_fpr)
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rc = keyserver_import_fprint_ntds (ctrl,
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fprbuf.u.fpr, fprbuf_fprlen);
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else
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rc = keyserver_import_ntds (ctrl, name, &fpr, &fpr_len);
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glo_ctrl.in_auto_key_retrieve--;
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break;
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@ -1218,8 +1290,25 @@ get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
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{
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mechanism_string = "keyserver";
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_name (ctrl, name, &fpr, &fpr_len,
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opt.keyserver);
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if (is_fpr)
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{
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rc = keyserver_import_fprint (ctrl,
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fprbuf.u.fpr, fprbuf_fprlen,
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opt.keyserver,
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KEYSERVER_IMPORT_FLAG_LDAP);
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/* Map error codes because Dirmngr returns NO
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* DATA if the keyserver does not have the
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* requested key. It returns NO KEYSERVER if no
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* LDAP keyservers are configured. */
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if (gpg_err_code (rc) == GPG_ERR_NO_DATA
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|| gpg_err_code (rc) == GPG_ERR_NO_KEYSERVER)
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rc = gpg_error (GPG_ERR_NO_PUBKEY);
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}
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else
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{
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rc = keyserver_import_name (ctrl, name, &fpr, &fpr_len,
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opt.keyserver);
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}
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glo_ctrl.in_auto_key_retrieve--;
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}
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else
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@ -1236,8 +1325,21 @@ get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
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mechanism_string = akl->spec->uri;
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keyserver = keyserver_match (akl->spec);
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glo_ctrl.in_auto_key_retrieve++;
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rc = keyserver_import_name (ctrl,
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name, &fpr, &fpr_len, keyserver);
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if (is_fpr)
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{
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rc = keyserver_import_fprint (ctrl,
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fprbuf.u.fpr, fprbuf_fprlen,
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opt.keyserver,
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KEYSERVER_IMPORT_FLAG_LDAP);
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if (gpg_err_code (rc) == GPG_ERR_NO_DATA
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|| gpg_err_code (rc) == GPG_ERR_NO_KEYSERVER)
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rc = gpg_error (GPG_ERR_NO_PUBKEY);
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}
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else
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{
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rc = keyserver_import_name (ctrl, name,
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&fpr, &fpr_len, keyserver);
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}
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glo_ctrl.in_auto_key_retrieve--;
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}
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break;
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@ -1250,21 +1352,27 @@ get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
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* requirement as the URL might point to a key put in by an
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* attacker. By forcing the use of the fingerprint, we
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* won't use the attacker's key here. */
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if (!rc && fpr)
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if (!rc && (fpr || is_fpr))
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{
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char fpr_string[MAX_FINGERPRINT_LEN * 2 + 1];
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log_assert (fpr_len <= MAX_FINGERPRINT_LEN);
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free_strlist (namelist);
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namelist = NULL;
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bin2hex (fpr, fpr_len, fpr_string);
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if (is_fpr)
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{
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log_assert (fprbuf_fprlen <= MAX_FINGERPRINT_LEN);
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bin2hex (fprbuf.u.fpr, fprbuf_fprlen, fpr_string);
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}
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else
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{
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log_assert (fpr_len <= MAX_FINGERPRINT_LEN);
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bin2hex (fpr, fpr_len, fpr_string);
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}
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if (opt.verbose)
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log_info ("auto-key-locate found fingerprint %s\n",
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fpr_string);
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free_strlist (namelist);
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namelist = NULL;
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add_to_strlist (&namelist, fpr_string);
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}
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else if (!rc && !fpr && !did_akl_local)
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10
g10/gpgv.c
10
g10/gpgv.c
@ -440,6 +440,16 @@ keyserver_import_fprint (ctrl_t ctrl, const byte *fprint,size_t fprint_len,
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return -1;
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}
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int
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keyserver_import_fprint_ntds (ctrl_t ctrl,
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const byte *fprint, size_t fprint_len)
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{
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(void)ctrl;
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(void)fprint;
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(void)fprint_len;
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return -1;
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}
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int
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keyserver_import_cert (const char *name)
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{
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@ -41,6 +41,8 @@ int keyserver_import (ctrl_t ctrl, strlist_t users);
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int keyserver_import_fprint (ctrl_t ctrl, const byte *fprint,size_t fprint_len,
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struct keyserver_spec *keyserver,
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unsigned int flags);
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int keyserver_import_fprint_ntds (ctrl_t ctrl,
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const byte *fprint, size_t fprint_len);
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int keyserver_import_keyid (ctrl_t ctrl, u32 *keyid,
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struct keyserver_spec *keyserver,
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unsigned int flags);
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@ -1175,28 +1175,38 @@ keyserver_import_ntds (ctrl_t ctrl, const char *mbox,
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int
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keyserver_import_fprint (ctrl_t ctrl, const byte *fprint,size_t fprint_len,
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keyserver_import_fprint (ctrl_t ctrl, const byte *fprint, size_t fprint_len,
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struct keyserver_spec *keyserver,
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unsigned int flags)
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{
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KEYDB_SEARCH_DESC desc;
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memset(&desc,0,sizeof(desc));
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memset (&desc, 0, sizeof(desc));
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if(fprint_len==16)
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desc.mode=KEYDB_SEARCH_MODE_FPR16;
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else if(fprint_len==20)
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desc.mode=KEYDB_SEARCH_MODE_FPR20;
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else
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return -1;
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return gpg_error (GPG_ERR_INV_ARG);
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memcpy(desc.u.fpr,fprint,fprint_len);
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memcpy (desc.u.fpr, fprint, fprint_len);
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/* TODO: Warn here if the fingerprint we got doesn't match the one
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we asked for? */
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return keyserver_get (ctrl, &desc, 1, keyserver, flags, NULL, NULL);
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}
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int
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keyserver_import_fprint_ntds (ctrl_t ctrl,
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const byte *fprint, size_t fprint_len)
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{
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struct keyserver_spec keyserver = { NULL, "ldap:///" };
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return keyserver_import_fprint (ctrl, fprint, fprint_len,
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&keyserver, KEYSERVER_IMPORT_FLAG_LDAP);
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}
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int
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keyserver_import_keyid (ctrl_t ctrl,
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u32 *keyid,struct keyserver_spec *keyserver,
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@ -198,6 +198,16 @@ keyserver_import_fprint (ctrl_t ctrl, const byte *fprint,size_t fprint_len,
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return -1;
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}
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int
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keyserver_import_fprint_ntds (ctrl_t ctrl,
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const byte *fprint, size_t fprint_len)
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{
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(void)ctrl;
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(void)fprint;
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(void)fprint_len;
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return -1;
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}
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int
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keyserver_import_cert (const char *name)
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{
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