src/pEp_internal.h
author Krista Bennett <krista@pep-project.org>
Sun, 04 Feb 2018 03:36:08 +0100
branchmistrust_fixes
changeset 2471 4f1c2d62b2dd
parent 2467 ef6bb2e8a84c
child 2473 6ca62f99148e
permissions -rw-r--r--
A whole horde of trust fixes (mistrust list added, tests fixed, and sneaky null string in elect key removed)
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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 "0.9.0"
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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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// 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 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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#define LOCAL_DB unix_local_db()
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#ifndef SYSTEM_DB
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#define SYSTEM_DB "/usr/share/pEp/system.db"
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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_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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#ifdef USE_GPG
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#include "pgp_gpg_internal.h"
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#elif defined(USE_NETPGP)
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#include "pgp_netpgp_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.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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#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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#endif
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    PEP_cryptotech_t *cryptotech;
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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 *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 *remove_fpr_as_default;
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    sqlite3_stmt *set_person;
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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;
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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_for_fpr;
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    sqlite3_stmt *get_trust;
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    sqlite3_stmt *least_trust;
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    sqlite3_stmt *mark_compromized;
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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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    // Own keys
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    sqlite3_stmt *own_key_is_listed;
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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_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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    sqlite3_stmt *sequence_value3;
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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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    // 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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    void *sync_management;
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    void *sync_obj;
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    messageToSend_t messageToSend;
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    notifyHandshake_t notifyHandshake;
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    inject_sync_msg_t inject_sync_msg;
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    retrieve_next_sync_msg_t retrieve_next_sync_msg;
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    // key sync
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    pEpSession* sync_session;
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    DeviceState_state 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 keep_sync_msg;
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    bool service_log;
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    // mistrust undo cache
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    pEp_identity* cached_mistrusted;
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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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        } 
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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 )
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        return PEP_TRUSTWORDS_FPR_WRONG_LENGTH;
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    // Then purge remaining chars, all must be ignored chars
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    while ( ai < fpras )
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    {
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        char fprac = fpra[ai];
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        normalize_hex_res_t fprah = _normalize_hex(&fprac);
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        if( fprah == reject_hex )
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            return PEP_ILLEGAL_VALUE;
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        if ( fprah != ignore_hex )
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            return PEP_TRUSTWORDS_FPR_WRONG_LENGTH;
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        ai++;
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    }
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    while ( bi < fprbs )
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    {
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        char fprbc = fprb[bi];
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        normalize_hex_res_t fprbh = _normalize_hex(&fprbc);
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        if( fprbh == reject_hex )
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            return PEP_ILLEGAL_VALUE;
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        if ( fprbh != ignore_hex )
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            return PEP_TRUSTWORDS_FPR_WRONG_LENGTH;
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        bi++;
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    }
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    *comparison = _comparison;
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    return PEP_STATUS_OK;
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}
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static inline int _same_fpr(
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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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    )
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{
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    // illegal values are ignored, and considered not same.
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    int comparison = 1;
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    _compare_fprs(fpra, fpras, fprb, fprbs, &comparison);
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    return comparison == 0;
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}
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// size is the length of the bytestr that's coming in. This is really only intended
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// for comparing two full strings. If charstr's length is different from bytestr_size,
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// we'll return a non-zero value.
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static inline int _unsigned_signed_strcmp(const unsigned char* bytestr, const char* charstr, int bytestr_size) {
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    int charstr_len = strlen(charstr);
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    if (charstr_len != bytestr_size)
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        return -1; // we don't actually care except that it's non-zero
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    return memcmp(bytestr, charstr, bytestr_size);
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}
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// This is just a horrible example of C type madness. UTF-8 made me do it.
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static inline char* _pep_subj_copy() {
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#ifndef WIN32
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    unsigned char pepstr[] = PEP_SUBJ_STRING;
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    void* retval = calloc(1, sizeof(unsigned char)*PEP_SUBJ_BYTELEN + 1);
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    memcpy(retval, pepstr, PEP_SUBJ_BYTELEN);
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    return (char*)retval;
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#else
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    return strdup("pEp");
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#endif
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}
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static inline bool is_me(PEP_SESSION session, pEp_identity* test_ident) {
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   385
    bool retval = false;
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   386
    if (test_ident && test_ident->user_id) {
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   387
        char* def_id = NULL;
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   388
        get_default_own_userid(session, &def_id);
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   389
        if (test_ident->me || 
krista@2461
   390
            (def_id && strcmp(def_id, test_ident->user_id) == 0)) {
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   391
            retval = true;
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   392
        }
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   393
        free(def_id);
krista@2461
   394
    }
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   395
    return retval;
krista@2461
   396
}
krista@2461
   397
krista@2461
   398
#ifndef EMPTYSTR
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   399
#define EMPTYSTR(STR) ((STR) == NULL || (STR)[0] == '\0')
krista@2461
   400
#endif
krista@2461
   401
krista@2461
   402
#ifndef _MIN
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   403
#define _MIN(A, B) ((B) > (A) ? (A) : (B))
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   404
#endif
krista@2461
   405
#ifndef _MAX
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   406
#define _MAX(A, B) ((B) > (A) ? (B) : (A))
krista@2461
   407
#endif
krista@2461
   408
krista@2461
   409
krista@2176
   410
// These are globals used in generating message IDs and should only be
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   411
// computed once, as they're either really constants or OS-dependent
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   412
krista@2467
   413
extern int _pEp_rand_max_bits;
krista@2467
   414
extern double _pEp_log2_36;
krista@2176
   415
krista@2176
   416
static inline void _init_globals() {
krista@2176
   417
    _pEp_rand_max_bits = ceil(log2(RAND_MAX));
krista@2176
   418
    _pEp_log2_36 = log2(36);
krista@2176
   419
}
krista@2176
   420
roker@1722
   421
#ifdef DEBUG_ERRORSTACK
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   422
    PEP_STATUS session_add_error(PEP_SESSION session, const char* file, unsigned line, PEP_STATUS status);
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   423
    #define ADD_TO_LOG(status)   session_add_error(session, __FILE__, __LINE__, (status))
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   424
    #define GOTO(label)          do{ (void)session_add_error(session, __FILE__, __LINE__, status); goto label; }while(0)
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   425
#else
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   426
    #define ADD_TO_LOG(status)   (status)
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   427
    #define GOTO(label)          goto label
roker@1722
   428
#endif