/* trustdb.h - Trust database
 * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
 *               2005, 2012 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * GnuPG is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <https://www.gnu.org/licenses/>.
 */

#ifndef G10_TRUSTDB_H
#define G10_TRUSTDB_H

/* Trust values must be sorted in ascending order! */
#define TRUST_MASK	 15
#define TRUST_UNKNOWN	  0  /* o: not yet calculated/assigned */
#define TRUST_EXPIRED	  1  /* e: calculation may be invalid */
#define TRUST_UNDEFINED   2  /* q: not enough information for calculation */
#define TRUST_NEVER	  3  /* n: never trust this pubkey */
#define TRUST_MARGINAL	  4  /* m: marginally trusted */
#define TRUST_FULLY	  5  /* f: fully trusted      */
#define TRUST_ULTIMATE	  6  /* u: ultimately trusted */
/* Trust values not covered by the mask. */
#define TRUST_FLAG_REVOKED        32 /* r: revoked */
#define TRUST_FLAG_SUB_REVOKED    64 /* r: revoked but for subkeys */
#define TRUST_FLAG_DISABLED      128 /* d: key/uid disabled */
#define TRUST_FLAG_PENDING_CHECK 256 /* a check-trustdb is pending */
#define TRUST_FLAG_TOFU_BASED    512 /* The trust value is based on
                                      * the TOFU information.  */

/* Private value used in tofu.c - must be different from the trust
   values.  */
#define _tofu_GET_TRUST_ERROR 100

/* Length of the hash used to select UIDs in keyedit.c.  */
#define NAMEHASH_LEN  20


/*
 * A structure to store key identification as well as some stuff needed
 * for validation
 */
struct key_item {
  struct key_item *next;
  unsigned int ownertrust,min_ownertrust;
  byte trust_depth;
  byte trust_value;
  char *trust_regexp;
  u32 kid[2];
};


/*
 * Check whether the signature SIG is in the klist K.
 */
static inline struct key_item *
is_in_klist (struct key_item *k, PKT_signature *sig)
{
  for (; k; k = k->next)
    {
      if (k->kid[0] == sig->keyid[0] && k->kid[1] == sig->keyid[1])
        return k;
    }
  return NULL;
}



/*-- trust.c --*/
int cache_disabled_value (ctrl_t ctrl, PKT_public_key *pk);
void register_trusted_keyid (u32 *keyid);
void register_trusted_key (const char *string);

const char *trust_value_to_string (unsigned int value);
int string_to_trust_value (const char *str);
const char *uid_trust_string_fixed (ctrl_t ctrl,
                                    PKT_public_key *key, PKT_user_id *uid);

unsigned int get_ownertrust (ctrl_t ctrl, PKT_public_key *pk);
void update_ownertrust (ctrl_t ctrl,
                        PKT_public_key *pk, unsigned int new_trust);
int clear_ownertrusts (ctrl_t ctrl, PKT_public_key *pk);

void revalidation_mark (ctrl_t ctrl);
void check_trustdb_stale (ctrl_t ctrl);
void check_or_update_trustdb (ctrl_t ctrl);

unsigned int get_validity (ctrl_t ctrl, kbnode_t kb, PKT_public_key *pk,
                           PKT_user_id *uid,
			   PKT_signature *sig, int may_ask);
int get_validity_info (ctrl_t ctrl, kbnode_t kb, PKT_public_key *pk,
                       PKT_user_id *uid);
const char *get_validity_string (ctrl_t ctrl,
                                 PKT_public_key *pk, PKT_user_id *uid);

void mark_usable_uid_certs (ctrl_t ctrl, kbnode_t keyblock, kbnode_t uidnode,
                            u32 *main_kid, struct key_item *klist,
                            u32 curtime, u32 *next_expire);

void clean_one_uid (ctrl_t ctrl, kbnode_t keyblock, kbnode_t uidnode,
                    int noisy, int self_only,
                    int *uids_cleaned, int *sigs_cleaned);
void clean_key (ctrl_t ctrl, kbnode_t keyblock, int noisy, int self_only,
                int *uids_cleaned,int *sigs_cleaned);



/*-- trustdb.c --*/
void tdb_register_trusted_keyid (u32 *keyid);
void tdb_register_trusted_key (const char *string);
/* Returns whether KID is on the list of ultimately trusted keys.  */
int tdb_keyid_is_utk (u32 *kid);
/* Return the list of ultimately trusted keys.  The caller must not
 * modify this list nor must it free the list.  */
struct key_item *tdb_utks (void);
void check_trustdb (ctrl_t ctrl);
void update_trustdb (ctrl_t ctrl);
int setup_trustdb( int level, const char *dbname );
void how_to_fix_the_trustdb (void);
const char *trust_model_string (int model);
gpg_error_t init_trustdb (ctrl_t ctrl, int no_create);
int have_trustdb (ctrl_t ctrl);
void tdb_check_trustdb_stale (ctrl_t ctrl);
void tdb_revalidation_mark (ctrl_t ctrl);
int trustdb_pending_check(void);
void tdb_check_or_update (ctrl_t ctrl);

int tdb_cache_disabled_value (ctrl_t ctrl, PKT_public_key *pk);

unsigned int tdb_get_validity_core (ctrl_t ctrl, kbnode_t kb,
                                    PKT_public_key *pk, PKT_user_id *uid,
                                    PKT_public_key *main_pk,
				    PKT_signature *sig, int may_ask);

void list_trust_path( const char *username );
int enum_cert_paths( void **context, ulong *lid,
		     unsigned *ownertrust, unsigned *validity );
void enum_cert_paths_print( void **context, FILE *fp,
					   int refresh, ulong selected_lid );

void read_trust_options (ctrl_t ctrl, byte *trust_model,
                         ulong *created, ulong *nextcheck,
                         byte *marginals, byte *completes, byte *cert_depth,
                         byte *min_cert_level);

unsigned int tdb_get_ownertrust (ctrl_t ctrl, PKT_public_key *pk,
                                 int no_create);
unsigned int tdb_get_min_ownertrust (ctrl_t ctrl, PKT_public_key *pk,
                                     int no_create);
int get_ownertrust_info (ctrl_t ctrl, PKT_public_key *pk, int no_create);
const char *get_ownertrust_string (ctrl_t ctrl,
                                   PKT_public_key *pk, int no_create);

void tdb_update_ownertrust (ctrl_t ctrl, PKT_public_key *pk,
                            unsigned int new_trust);
int tdb_clear_ownertrusts (ctrl_t ctrl, PKT_public_key *pk);

/*-- tdbdump.c --*/
void list_trustdb (ctrl_t ctrl, estream_t fp, const char *username);
void export_ownertrust (ctrl_t ctrl);
void import_ownertrust (ctrl_t ctrl, const char *fname);

/*-- pkclist.c --*/
int edit_ownertrust (ctrl_t ctrl, PKT_public_key *pk, int mode);

#endif /*G10_TRUSTDB_H*/
