src/pEp_internal.h
author Claudio Luck <claudio.luck@pep.foundation>
Mon, 20 May 2019 12:26:41 +0200
branchENGINE-524
changeset 3735 25b31318dcdc
parent 3638 4ba9bd8b80c1
parent 3699 e2aa6fdbd20b
child 3740 248166aa4ab2
permissions -rw-r--r--
WIP: ENGINE-524: merge with sync
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// This file is under GNU General Public License 3.0
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// see LICENSE.txt
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#define PEP_ENGINE_VERSION "1.1.1"
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// maximum attachment size to import as key 1MB, maximum of 20 attachments
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#define MAX_KEY_SIZE (1024 * 1024)
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#define MAX_KEYS_TO_IMPORT  20
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#define KEY_EXPIRE_DELTA (60 * 60 * 24 * 365)
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// this is 20 trustwords with 79 chars max
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#define MAX_TRUSTWORDS_SPACE (20 * 80)
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// XML parameters string
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#define PARMS_MAX 32768
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// maximum busy wait time in ms
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#define BUSY_WAIT_TIME 5000
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// maximum line length for reading gpg.conf
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#define MAX_LINELENGTH 1024
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// default keyserver
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#ifndef DEFAULT_KEYSERVER
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#define DEFAULT_KEYSERVER "hkp://keys.gnupg.net"
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#endif
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// crashdump constants
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#ifndef CRASHDUMP_DEFAULT_LINES
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#define CRASHDUMP_DEFAULT_LINES 100
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#endif
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#define CRASHDUMP_MAX_LINES 32767
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// p≡p full string, NUL-terminated
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#ifndef PEP_SUBJ_STRING
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#define PEP_SUBJ_STRING {0x70,0xE2,0x89,0xA1,0x70,0x00}
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#define PEP_SUBJ_BYTELEN 5
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#endif
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#ifndef PEP_SUBJ_KEY
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#define PEP_SUBJ_KEY "Subject: "
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#define PEP_SUBJ_KEY_LC "subject: "
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#define PEP_SUBJ_KEY_LEN 9
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#endif
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#ifndef PEP_MSG_WRAP_KEY
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#define PEP_MSG_WRAP_KEY "pEp-Wrapped-Message-Info: "
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#define PEP_MSG_WRAP_KEY_LC "pep-wrapped-message-info: "
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#define PEP_MSG_WRAP_KEY_LEN 26
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#endif
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#include "platform.h"
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#ifdef WIN32
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#define LOCAL_DB windoze_local_db()
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#define LOCAL_KEYS_DB windoze_local_db()
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#define SYSTEM_DB windoze_system_db()
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#define LIBGPGME "libgpgme-11.dll"
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#else // UNIX
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#define _POSIX_C_SOURCE 200809L
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#include <dlfcn.h>
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#ifdef NDEBUG
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#define LOCAL_DB unix_local_db()
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#define LOCAL_KEYS_DB unix_local_keys_db()
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#else
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#define LOCAL_DB unix_local_db(false)
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#define LOCAL_KEYS_DB unix_local_keys_db(false)
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#endif
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#ifndef SYSTEM_DB
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#ifdef NDEBUG
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#define SYSTEM_DB unix_system_db()
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#else
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#define SYSTEM_DB unix_system_db(false)
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#endif
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#endif
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#ifndef LIBGPGME
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#define LIBGPGME "libgpgme-pthread.so"
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#endif
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#endif
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#include <locale.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <math.h>
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#ifdef SQLITE3_FROM_OS
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#include <sqlite3.h>
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#else
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#include "sqlite3.h"
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#endif
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#include "pEpEngine.h"
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// If not specified, build for GPG
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#ifndef USE_SEQUOIA
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#ifndef USE_NETPGP
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#ifndef USE_GPG
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#define USE_GPG
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#endif
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#endif
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#endif
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#if defined(USE_SEQUOIA)
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#include "pgp_sequoia_internal.h"
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#elif defined(USE_NETPGP)
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#include "pgp_netpgp_internal.h"
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#elif defined(USE_GPG)
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#include "pgp_gpg_internal.h"
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#endif
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#include "keymanagement.h"
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#include "cryptotech.h"
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#include "transport.h"
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#include "sync_api.h"
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#include "Sync_func.h"
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#include "key_reset.h"
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#define NOT_IMPLEMENTED assert(0); return PEP_UNKNOWN_ERROR;
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struct _pEpSession;
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typedef struct _pEpSession pEpSession;
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struct _pEpSession {
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    const char *version;
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    messageToSend_t messageToSend;
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#ifdef USE_GPG
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    gpgme_ctx_t ctx;
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#elif defined(USE_NETPGP)
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    pEpNetPGPSession ctx;
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#elif defined(USE_SEQUOIA)
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    sqlite3 *key_db;
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    struct {
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        sqlite3_stmt *begin_transaction;
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        sqlite3_stmt *commit_transaction;
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        sqlite3_stmt *rollback_transaction;
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        sqlite3_stmt *tpk_find;
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        sqlite3_stmt *tsk_find;
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        sqlite3_stmt *tpk_find_by_keyid;
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        sqlite3_stmt *tsk_find_by_keyid;
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        sqlite3_stmt *tpk_find_by_email;
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        sqlite3_stmt *tsk_find_by_email;
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        sqlite3_stmt *tpk_all;
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        sqlite3_stmt *tsk_all;
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        sqlite3_stmt *tpk_save_insert_primary;
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        sqlite3_stmt *tpk_save_insert_subkeys;
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        sqlite3_stmt *tpk_save_insert_userids;
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    } sq_sql;
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#endif
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    PEP_cryptotech_t *cryptotech;
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    PEP_CIPHER_SUITE cipher_suite;
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    PEP_transport_t *transports;
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    sqlite3 *db;
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    sqlite3 *system_db;
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    sqlite3_stmt *log;
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    sqlite3_stmt *trustword;
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    sqlite3_stmt *get_identity;
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    sqlite3_stmt *get_identity_without_trust_check;
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    sqlite3_stmt *get_identities_by_address;
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    sqlite3_stmt *get_identities_by_userid;
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    sqlite3_stmt *get_identities_by_main_key_id;
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    sqlite3_stmt *replace_identities_fpr;
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    sqlite3_stmt *replace_main_user_fpr;
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    sqlite3_stmt *get_main_user_fpr;
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    sqlite3_stmt *refresh_userid_default_key;
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    sqlite3_stmt *delete_key;
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    sqlite3_stmt *remove_fpr_as_default;
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    sqlite3_stmt *set_person;
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    sqlite3_stmt *update_person;
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    sqlite3_stmt *delete_person;
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    sqlite3_stmt *exists_person;    
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    sqlite3_stmt *set_as_pEp_user;
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    sqlite3_stmt *is_pEp_user;
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    sqlite3_stmt *add_into_social_graph;
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    sqlite3_stmt *get_own_address_binding_from_contact;
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    sqlite3_stmt *set_revoke_contact_as_notified;
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    sqlite3_stmt *get_contacted_ids_from_revoke_fpr;
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    sqlite3_stmt *was_id_for_revoke_contacted;
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    sqlite3_stmt *get_last_contacted;
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    // sqlite3_stmt *set_device_group;
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    // sqlite3_stmt *get_device_group;
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    sqlite3_stmt *set_pgp_keypair;
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    sqlite3_stmt *set_identity_entry;
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    sqlite3_stmt *update_identity_entry;
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    sqlite3_stmt *exists_identity_entry;        
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    sqlite3_stmt *set_identity_flags;
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    sqlite3_stmt *unset_identity_flags;
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    sqlite3_stmt *set_trust;
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    sqlite3_stmt *update_trust;
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    sqlite3_stmt *exists_trust_entry;
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    sqlite3_stmt *update_trust_to_pEp;
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    sqlite3_stmt *update_trust_for_fpr;
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    sqlite3_stmt *get_trust;
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    sqlite3_stmt *get_trust_by_userid;
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    sqlite3_stmt *least_trust;
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    sqlite3_stmt *mark_compromised;
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    sqlite3_stmt *reset_trust;
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    sqlite3_stmt *crashdump;
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    sqlite3_stmt *languagelist;
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    sqlite3_stmt *i18n_token;
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    sqlite3_stmt *replace_userid;
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    // blacklist
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    sqlite3_stmt *blacklist_add;
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    sqlite3_stmt *blacklist_delete;
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    sqlite3_stmt *blacklist_is_listed;
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    sqlite3_stmt *blacklist_retrieve;
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    // Keys
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    sqlite3_stmt *own_key_is_listed;
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    sqlite3_stmt *is_own_address;
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    sqlite3_stmt *own_identities_retrieve;
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    sqlite3_stmt *own_keys_retrieve;
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    sqlite3_stmt *get_user_default_key;
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    sqlite3_stmt *get_all_keys_for_user;
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    sqlite3_stmt *get_default_own_userid;
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//    sqlite3_stmt *set_own_key;
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    // sequence value
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    sqlite3_stmt *sequence_value1;
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    sqlite3_stmt *sequence_value2;
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    // revoked keys
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    sqlite3_stmt *set_revoked;
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    sqlite3_stmt *get_revoked;
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    sqlite3_stmt *get_replacement_fpr;
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    // mistrusted
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    sqlite3_stmt* add_mistrusted_key;
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    sqlite3_stmt* is_mistrusted_key;    
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    sqlite3_stmt* delete_mistrusted_key;
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    // aliases
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    sqlite3_stmt *get_userid_alias_default;
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    sqlite3_stmt *add_userid_alias;
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    // callbacks
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    examine_identity_t examine_identity;
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    void *examine_management;
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    notifyHandshake_t notifyHandshake;
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    inject_sync_event_t inject_sync_event;
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    retrieve_next_sync_event_t retrieve_next_sync_event;
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    // pEp Sync
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    void *sync_management;
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    void *sync_obj;
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    struct Sync_state_s sync_state;
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    struct own_Sync_state_s own_sync_state;
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//     void* sync_state_payload;
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//     char sync_uuid[37];
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//     time_t LastCannotDecrypt;
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//     time_t LastUpdateRequest;
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    // runtime config
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    bool passive_mode;
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    bool unencrypted_subject;
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    bool service_log;
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#ifdef DEBUG_ERRORSTACK
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    stringlist_t* errorstack;
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#endif
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};
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PEP_STATUS init_transport_system(PEP_SESSION session, bool in_first);
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void release_transport_system(PEP_SESSION session, bool out_last);
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/* NOT to be exposed to the outside!!! */
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PEP_STATUS encrypt_only(
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        PEP_SESSION session, const stringlist_t *keylist, const char *ptext,
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        size_t psize, char **ctext, size_t *csize
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);
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#if defined(NDEBUG) || defined(NOLOG)
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#define DEBUG_LOG(TITLE, ENTITY, DESC)
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#else
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#ifdef ANDROID
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#include <android/log.h>
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#define  LOG_MORE(...)  __android_log_print(ANDROID_LOG_DEBUG, "pEpEngine", " %s :: %s :: %s :: %s ", __VA_ARGS__);
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#else
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#include <stdio.h>
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#define  LOG_MORE(...)  fprintf(stderr, "pEpEngine DEBUG_LOG('%s','%s','%s','%s')\n", __VA_ARGS__);
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#endif
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#define DEBUG_LOG(TITLE, ENTITY, DESC) {\
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    log_event(session, (TITLE), (ENTITY), (DESC), "debug " __FILE__ ":" S_LINE);\
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    LOG_MORE((TITLE), (ENTITY), (DESC), __FILE__ ":" S_LINE)\
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}
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#endif
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typedef enum _normalize_hex_rest_t {
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    accept_hex,
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    ignore_hex,
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    reject_hex
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} normalize_hex_res_t;
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static inline normalize_hex_res_t _normalize_hex(char *hex) 
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{
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    if (*hex >= '0' && *hex <= '9')
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        return accept_hex;
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    if (*hex >= 'A' && *hex <= 'F') {
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        *hex += 'a' - 'A';
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        return accept_hex;
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    }
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    if (*hex >= 'a' && *hex <= 'f') 
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        return accept_hex;
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    if (*hex == ' ') 
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        return ignore_hex;
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    return reject_hex;
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}
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// Space tolerant and case insensitive fingerprint string compare
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static inline PEP_STATUS _compare_fprs(
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        const char* fpra,
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        size_t fpras,
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        const char* fprb,
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        size_t fprbs,
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        int* comparison)
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{
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    size_t ai = 0;
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    size_t bi = 0;
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    size_t significant = 0;
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    int _comparison = 0;
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    const int _FULL_FINGERPRINT_LENGTH = 40;
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    // First compare every non-ignored chars until an end is reached
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    while(ai < fpras && bi < fprbs)
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    {
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        char fprac = fpra[ai];
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        char fprbc = fprb[bi];
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        normalize_hex_res_t fprah = _normalize_hex(&fprac);
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        normalize_hex_res_t fprbh = _normalize_hex(&fprbc);
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        if(fprah == reject_hex || fprbh == reject_hex)
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            return PEP_ILLEGAL_VALUE;
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        if ( fprah == ignore_hex )
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        {
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            ai++;
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        }
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        else if ( fprbh == ignore_hex )
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        {
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            bi++;
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        }
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        else
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        {
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            if(fprac != fprbc && _comparison == 0 )
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            {
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                _comparison = fprac > fprbc ? 1 : -1;
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            }
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            significant++;
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            ai++;
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            bi++;
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   374
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   375
        } 
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    }
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    // Bail out if we didn't got enough significnt chars
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    if (significant != _FULL_FINGERPRINT_LENGTH )
edouard@1746
   380
        return PEP_TRUSTWORDS_FPR_WRONG_LENGTH;
edouard@1746
   381
edouard@1746
   382
    // Then purge remaining chars, all must be ignored chars
edouard@1746
   383
    while ( ai < fpras )
edouard@1746
   384
    {
edouard@1746
   385
        char fprac = fpra[ai];
edouard@1746
   386
        normalize_hex_res_t fprah = _normalize_hex(&fprac);
edouard@1746
   387
        if( fprah == reject_hex )
edouard@1746
   388
            return PEP_ILLEGAL_VALUE;
edouard@1746
   389
        if ( fprah != ignore_hex )
edouard@1746
   390
            return PEP_TRUSTWORDS_FPR_WRONG_LENGTH;
edouard@1746
   391
        ai++;
edouard@1746
   392
    }
edouard@1746
   393
    while ( bi < fprbs )
edouard@1746
   394
    {
edouard@1746
   395
        char fprbc = fprb[bi];
edouard@1746
   396
        normalize_hex_res_t fprbh = _normalize_hex(&fprbc);
edouard@1746
   397
        if( fprbh == reject_hex )
edouard@1746
   398
            return PEP_ILLEGAL_VALUE;
edouard@1746
   399
        if ( fprbh != ignore_hex )
edouard@1746
   400
            return PEP_TRUSTWORDS_FPR_WRONG_LENGTH;
edouard@1746
   401
        bi++;
edouard@1746
   402
    }
edouard@1746
   403
edouard@1746
   404
    *comparison = _comparison;
edouard@1746
   405
    return PEP_STATUS_OK;
edouard@1746
   406
}
edouard@1746
   407
edouard@1521
   408
static inline int _same_fpr(
edouard@1521
   409
        const char* fpra,
edouard@1521
   410
        size_t fpras,
edouard@1521
   411
        const char* fprb,
edouard@1521
   412
        size_t fprbs
edouard@1521
   413
    )
edouard@1521
   414
{
edouard@1746
   415
    // illegal values are ignored, and considered not same.
edouard@1746
   416
    int comparison = 1;
edouard@1746
   417
edouard@1746
   418
    _compare_fprs(fpra, fpras, fprb, fprbs, &comparison);
edouard@1746
   419
edouard@1746
   420
    return comparison == 0;
edouard@1521
   421
}
roker@1722
   422
krista@2045
   423
// size is the length of the bytestr that's coming in. This is really only intended
krista@2045
   424
// for comparing two full strings. If charstr's length is different from bytestr_size,
krista@2045
   425
// we'll return a non-zero value.
krista@2045
   426
static inline int _unsigned_signed_strcmp(const unsigned char* bytestr, const char* charstr, int bytestr_size) {
krista@2045
   427
    int charstr_len = strlen(charstr);
krista@2045
   428
    if (charstr_len != bytestr_size)
krista@2045
   429
        return -1; // we don't actually care except that it's non-zero
krista@2045
   430
    return memcmp(bytestr, charstr, bytestr_size);
krista@2045
   431
}
krista@2045
   432
krista@2045
   433
// This is just a horrible example of C type madness. UTF-8 made me do it.
vb@2834
   434
static inline char* _pEp_subj_copy() {
krista@2285
   435
#ifndef WIN32
vb@2834
   436
    unsigned char pEpstr[] = PEP_SUBJ_STRING;
krista@2045
   437
    void* retval = calloc(1, sizeof(unsigned char)*PEP_SUBJ_BYTELEN + 1);
vb@2834
   438
    memcpy(retval, pEpstr, PEP_SUBJ_BYTELEN);
krista@2045
   439
    return (char*)retval;
krista@2285
   440
#else
krista@2285
   441
    return strdup("pEp");
krista@2285
   442
#endif
krista@2045
   443
}
krista@2045
   444
krista@2461
   445
static inline bool is_me(PEP_SESSION session, pEp_identity* test_ident) {
krista@2461
   446
    bool retval = false;
krista@2461
   447
    if (test_ident && test_ident->user_id) {
krista@2461
   448
        char* def_id = NULL;
krista@2461
   449
        get_default_own_userid(session, &def_id);
krista@2461
   450
        if (test_ident->me || 
krista@2461
   451
            (def_id && strcmp(def_id, test_ident->user_id) == 0)) {
krista@2461
   452
            retval = true;
krista@2461
   453
        }
krista@2461
   454
        free(def_id);
krista@2461
   455
    }
krista@2461
   456
    return retval;
krista@2461
   457
}
krista@2461
   458
krista@2461
   459
#ifndef EMPTYSTR
krista@2461
   460
#define EMPTYSTR(STR) ((STR) == NULL || (STR)[0] == '\0')
krista@2461
   461
#endif
krista@2461
   462
krista@2549
   463
#ifndef IS_PGP_CT
krista@2549
   464
#define IS_PGP_CT(CT) (((CT) | PEP_ct_confirmed) == PEP_ct_OpenPGP)
krista@2549
   465
#endif
krista@2549
   466
krista@2461
   467
#ifndef _MIN
krista@2461
   468
#define _MIN(A, B) ((B) > (A) ? (A) : (B))
krista@2461
   469
#endif
krista@2461
   470
#ifndef _MAX
krista@2461
   471
#define _MAX(A, B) ((B) > (A) ? (B) : (A))
krista@2461
   472
#endif
krista@2461
   473
krista@2461
   474
krista@2176
   475
// These are globals used in generating message IDs and should only be
krista@2176
   476
// computed once, as they're either really constants or OS-dependent
krista@2176
   477
krista@2467
   478
extern int _pEp_rand_max_bits;
krista@2467
   479
extern double _pEp_log2_36;
krista@2176
   480
krista@2176
   481
static inline void _init_globals() {
vb@2571
   482
    _pEp_rand_max_bits = (int) ceil(log2((double) RAND_MAX));
krista@2176
   483
    _pEp_log2_36 = log2(36);
krista@2176
   484
}