mirror of git://git.gnupg.org/gnupg.git
110 lines
4.3 KiB
C
110 lines
4.3 KiB
C
/* tofu.h - TOFU trust model.
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* Copyright (C) 2015 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef G10_TOFU_H
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#define G10_TOFU_H
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#include <config.h>
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/* For each binding, we have a trust policy. */
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enum tofu_policy
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{
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/* This value can be returned by tofu_get_policy to indicate that
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there is no policy set for the specified binding. */
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TOFU_POLICY_NONE = 0,
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/* We made a default policy decision. This is only done if there
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is no conflict with another binding (that is, the email address
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is not part of another known key). The default policy is
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configurable (and specified using: --tofu-default-policy).
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Note: when using the default policy, we save TOFU_POLICY_AUTO
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with the binding, not the policy that was in effect. This way,
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if the user invokes gpg again, but with a different value for
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--tofu-default-policy, a different decision is made. */
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TOFU_POLICY_AUTO = 1,
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/* The user explicitly marked the binding as good. In this case,
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we return TRUST_FULLY. */
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TOFU_POLICY_GOOD = 2,
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/* The user explicitly marked the binding as unknown. In this
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case, we return TRUST_UNKNOWN. */
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TOFU_POLICY_UNKNOWN = 3,
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/* The user explicitly marked the binding as bad. In this case,
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we always return TRUST_NEVER. */
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TOFU_POLICY_BAD = 4,
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/* The user deferred a definitive policy decision about the
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binding (by selecting accept once or reject once). The next
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time we see this binding, we should ask the user what to
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do. */
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TOFU_POLICY_ASK = 5,
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/* Privat evalue used only within tofu.c. */
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_tofu_GET_POLICY_ERROR = 100
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};
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/* Return a string representation of a trust policy. Returns "???" if
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POLICY is not valid. */
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const char *tofu_policy_str (enum tofu_policy policy);
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/* Convert a binding policy (e.g., TOFU_POLICY_BAD) to a trust level
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(e.g., TRUST_BAD) in light of the current configuration. */
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int tofu_policy_to_trust_level (enum tofu_policy policy);
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/* Register the binding <FINGERPRINT, USER_ID> and the signature
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described by SIGS_DIGEST and SIG_TIME, which it generated. Origin
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describes where the signed data came from, e.g., "email:claws"
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(default: "unknown"). If MAY_ASK is 1, then this function may
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interact with the user in the case of a conflict or if the
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binding's policy is ask. This function returns the binding's trust
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level. If an error occurs, it returns TRUST_UNKNOWN. */
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int tofu_register (const byte *fingerprint, const char *user_id,
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const byte *sigs_digest, int sigs_digest_len,
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time_t sig_time, const char *origin, int may_ask);
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/* Combine a trust level returned from the TOFU trust model with a
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trust level returned by the PGP trust model. This is primarily of
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interest when the trust model is tofu+pgp (TM_TOFU_PGP). */
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int tofu_wot_trust_combine (int tofu, int wot);
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/* Determine the validity (TRUST_NEVER, etc.) of the binding
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<FINGERPRINT, USER_ID>. If MAY_ASK is 1, then this function may
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interact with the user. If not, TRUST_UNKNOWN is returned. If an
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error occurs, TRUST_UNDEFINED is returned. */
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int tofu_get_validity (const byte *fingerprint, const char *user_id,
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int may_ask);
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/* Set the policy for all non-revoked user ids in the keyblock KB to
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POLICY. */
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gpg_error_t tofu_set_policy (kbnode_t kb, enum tofu_policy policy);
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/* Set the TOFU policy for all non-revoked users in the key with the
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key id KEYID to POLICY. */
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gpg_error_t tofu_set_policy_by_keyid (u32 *keyid, enum tofu_policy policy);
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/* Return the TOFU policy for the specified binding in *POLICY. */
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gpg_error_t tofu_get_policy (PKT_public_key *pk, PKT_user_id *user_id,
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enum tofu_policy *policy);
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#endif /*G10_TOFU_H*/
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