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otr.c
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otr.c
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/********************************************************************\
* BitlBee -- An IRC to other IM-networks gateway *
* *
* Copyright 2002-2012 Wilmer van der Gaast and others *
\********************************************************************/
/*
OTR support (cf. http://www.cypherpunks.ca/otr/)
(c) 2008-2011,2013 Sven Moritz Hallberg <pesco@khjk.org>
funded by stonedcoder.org
files used to store OTR data:
<configdir>/<nick>.otr_keys
<configdir>/<nick>.otr_fprints
<configdir>/<nick>.otr_instags <- don't copy this one between hosts
top-level todos: (search for TODO for more ;-))
integrate otr_load/otr_save with existing storage backends
per-account policy settings
per-user policy settings
add a way to select recipient instance
*/
/*
This program 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 2 of the License, or
(at your option) any later version.
This program 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 with
the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
if not, write to the Free Software Foundation, Inc., 51 Franklin St.,
Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "bitlbee.h"
#include "irc.h"
#include "otr.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
/** OTR interface routines for the OtrlMessageAppOps struct: **/
OtrlPolicy op_policy(void *opdata, ConnContext *context);
void op_create_privkey(void *opdata, const char *accountname, const char *protocol);
int op_is_logged_in(void *opdata, const char *accountname, const char *protocol,
const char *recipient);
void op_inject_message(void *opdata, const char *accountname, const char *protocol,
const char *recipient, const char *message);
void op_new_fingerprint(void *opdata, OtrlUserState us, const char *accountname,
const char *protocol, const char *username, unsigned char fingerprint[20]);
void op_write_fingerprints(void *opdata);
void op_gone_secure(void *opdata, ConnContext *context);
void op_gone_insecure(void *opdata, ConnContext *context);
void op_still_secure(void *opdata, ConnContext *context, int is_reply);
void op_log_message(void *opdata, const char *message);
int op_max_message_size(void *opdata, ConnContext *context);
const char *op_account_name(void *opdata, const char *account, const char *protocol);
void op_create_instag(void *opdata, const char *account, const char *protocol);
void op_convert_msg(void *opdata, ConnContext *ctx, OtrlConvertType typ,
char **dst, const char *src);
void op_convert_free(void *opdata, ConnContext *ctx, char *msg);
void op_handle_smp_event(void *opdata, OtrlSMPEvent ev, ConnContext *ctx,
unsigned short percent, char *question);
void op_handle_msg_event(void *opdata, OtrlMessageEvent ev, ConnContext *ctx,
const char *message, gcry_error_t err);
const char *op_otr_error_message(void *opdata, ConnContext *ctx,
OtrlErrorCode err_code);
/** otr sub-command handlers: **/
static void cmd_otr(irc_t *irc, char **args);
void cmd_otr_connect(irc_t *irc, char **args);
void cmd_otr_disconnect(irc_t *irc, char **args);
void cmd_otr_reconnect(irc_t *irc, char **args);
void cmd_otr_smp(irc_t *irc, char **args);
void cmd_otr_smpq(irc_t *irc, char **args);
void cmd_otr_trust(irc_t *irc, char **args);
void cmd_otr_info(irc_t *irc, char **args);
void cmd_otr_keygen(irc_t *irc, char **args);
void cmd_otr_forget(irc_t *irc, char **args);
const command_t otr_commands[] = {
{ "connect", 1, &cmd_otr_connect, 0 },
{ "disconnect", 1, &cmd_otr_disconnect, 0 },
{ "reconnect", 1, &cmd_otr_reconnect, 0 },
{ "smp", 2, &cmd_otr_smp, 0 },
{ "smpq", 3, &cmd_otr_smpq, 0 },
{ "trust", 6, &cmd_otr_trust, 0 },
{ "info", 0, &cmd_otr_info, 0 },
{ "keygen", 1, &cmd_otr_keygen, 0 },
{ "forget", 2, &cmd_otr_forget, 0 },
{ NULL }
};
typedef struct {
void *fst;
void *snd;
} pair_t;
static OtrlMessageAppOps otr_ops; /* collects interface functions required by OTR */
/** misc. helpers/subroutines: **/
/* check whether we are already generating a key for a given account */
int keygen_in_progress(irc_t *irc, const char *handle, const char *protocol);
/* start background process to generate a (new) key for a given account */
void otr_keygen(irc_t *irc, const char *handle, const char *protocol);
/* main function for the forked keygen slave */
void keygen_child_main(OtrlUserState us, int infd, int outfd);
/* mainloop handler for when a keygen finishes */
gboolean keygen_finish_handler(gpointer data, gint fd, b_input_condition cond);
/* copy the contents of file a to file b, overwriting it if it exists */
void copyfile(const char *a, const char *b);
/* read one line of input from a stream, excluding trailing newline */
void myfgets(char *s, int size, FILE *stream);
/* some yes/no handlers */
void yes_keygen(void *data);
void yes_forget_fingerprint(void *data);
void yes_forget_context(void *data);
void yes_forget_key(void *data);
/* timeout handler that calls otrl_message_poll */
gboolean ev_message_poll(gpointer data, gint fd, b_input_condition cond);
/* helper to make sure accountname and protocol match the incoming "opdata" */
struct im_connection *check_imc(void *opdata, const char *accountname,
const char *protocol);
/* determine the nick for a given handle/protocol pair
returns "handle/protocol" if not found */
const char *peernick(irc_t *irc, const char *handle, const char *protocol);
/* turn a hexadecimal digit into its numerical value */
int hexval(char a);
/* determine the irc_user_t for a given handle/protocol pair
returns NULL if not found */
irc_user_t *peeruser(irc_t *irc, const char *handle, const char *protocol);
/* show an otr-related message to the user */
void display_otr_message(void *opdata, ConnContext *ctx, const char *fmt, ...);
/* write an otr-related message to the system log */
void log_otr_message(void *opdata, const char *fmt, ...);
/* combined handler for the 'otr smp' and 'otr smpq' commands */
void otr_smp_or_smpq(irc_t *irc, const char *nick, const char *question,
const char *secret);
/* update flags within the irc_user structure to reflect OTR status of context */
void otr_update_uflags(ConnContext *context, irc_user_t *u);
/* update op/voice flag of given user according to encryption state and settings
returns 0 if neither op_buddies nor voice_buddies is set to "encrypted",
i.e. msgstate should be announced separately */
int otr_update_modeflags(irc_t *irc, irc_user_t *u);
/* show general info about the OTR subsystem; called by 'otr info' */
void show_general_otr_info(irc_t *irc);
/* show info about a given OTR context and subcontexts/instances. bestctx
may be either NULL or preferred destination context (this is hilighted
in the output as being the target for a message) */
void show_otr_context_info(irc_t *irc, ConnContext *ctx, ConnContext *bestctx);
/* show the list of fingerprints associated with a given context */
void show_fingerprints(irc_t *irc, ConnContext *ctx);
/* find a fingerprint by prefix (given as any number of hex strings) */
Fingerprint *match_fingerprint(irc_t *irc, ConnContext *ctx, const char **args);
/* find a private key by fingerprint prefix (given as any number of hex strings) */
OtrlPrivKey *match_privkey(irc_t *irc, const char **args);
/* check whether a string is safe to use in a path component */
int strsane(const char *s);
/* close the OTR connection with the given buddy */
gboolean otr_disconnect_user(irc_t *irc, irc_user_t *u);
/* close all active OTR connections */
void otr_disconnect_all(irc_t *irc);
/* modifies string in-place, replacing \x03 with '?',
as a quick way to prevent remote users from messing with irc colors */
static char *otr_filter_colors(char *msg);
/* functions to be called for certain events */
static const struct irc_plugin otr_plugin;
#define OTR_COLOR_TRUSTED "03" /* green */
#define OTR_COLOR_UNTRUSTED "05" /* red */
/*** routines declared in otr.h: ***/
#ifdef OTR_BI
#define init_plugin otr_init
#endif
void init_plugin(void)
{
OTRL_INIT;
/* fill global OtrlMessageAppOps */
otr_ops.policy = &op_policy;
otr_ops.create_privkey = &op_create_privkey;
otr_ops.is_logged_in = &op_is_logged_in;
otr_ops.inject_message = &op_inject_message;
otr_ops.update_context_list = NULL;
otr_ops.new_fingerprint = &op_new_fingerprint;
otr_ops.write_fingerprints = &op_write_fingerprints;
otr_ops.gone_secure = &op_gone_secure;
otr_ops.gone_insecure = &op_gone_insecure;
otr_ops.still_secure = &op_still_secure;
otr_ops.max_message_size = &op_max_message_size;
otr_ops.account_name = &op_account_name;
otr_ops.account_name_free = NULL;
/* stuff added with libotr 4.0.0 */
otr_ops.received_symkey = NULL; /* we don't use the extra key */
otr_ops.otr_error_message = &op_otr_error_message;
otr_ops.otr_error_message_free = NULL;
otr_ops.resent_msg_prefix = NULL; /* default: [resent] */
otr_ops.resent_msg_prefix_free = NULL;
otr_ops.handle_smp_event = &op_handle_smp_event;
otr_ops.handle_msg_event = &op_handle_msg_event;
otr_ops.create_instag = &op_create_instag;
otr_ops.convert_msg = &op_convert_msg;
otr_ops.convert_free = &op_convert_free;
otr_ops.timer_control = NULL; /* we just poll */
root_command_add("otr", 1, cmd_otr, 0);
register_irc_plugin(&otr_plugin);
}
#ifndef OTR_BI
struct plugin_info *init_plugin_info(void)
{
static struct plugin_info info = {
BITLBEE_ABI_VERSION_CODE,
"otr",
BITLBEE_VERSION,
"Off-the-Record communication",
NULL,
NULL
};
return &info;
}
#endif
gboolean otr_irc_new(irc_t *irc)
{
set_t *s;
GSList *l;
irc->otr = g_new0(otr_t, 1);
irc->otr->us = otrl_userstate_create();
s = set_add(&irc->b->set, "otr_color_encrypted", "true", set_eval_bool, irc);
s = set_add(&irc->b->set, "otr_policy", "opportunistic", set_eval_list, irc);
l = g_slist_prepend(NULL, "never");
l = g_slist_prepend(l, "opportunistic");
l = g_slist_prepend(l, "manual");
l = g_slist_prepend(l, "always");
s->eval_data = l;
s = set_add(&irc->b->set, "otr_does_html", "true", set_eval_bool, irc);
/* regularly call otrl_message_poll */
gint definterval = otrl_message_poll_get_default_interval(irc->otr->us);
irc->otr->timer = b_timeout_add(definterval, ev_message_poll, irc->otr);
return TRUE;
}
void otr_irc_free(irc_t *irc)
{
set_t *s;
otr_t *otr = irc->otr;
otr_disconnect_all(irc);
b_event_remove(otr->timer);
otrl_userstate_free(otr->us);
s = set_find(&irc->b->set, "otr_policy");
g_slist_free(s->eval_data);
if (otr->keygen) {
kill(otr->keygen, SIGTERM);
waitpid(otr->keygen, NULL, 0);
/* TODO: remove stale keygen tempfiles */
}
if (otr->to) {
fclose(otr->to);
}
if (otr->from) {
fclose(otr->from);
}
while (otr->todo) {
kg_t *p = otr->todo;
otr->todo = p->next;
g_free(p);
}
g_free(otr);
}
void otr_load(irc_t *irc)
{
char s[512];
account_t *a;
gcry_error_t e;
gcry_error_t enoent = gcry_error_from_errno(ENOENT);
int kg = 0;
if (strsane(irc->user->nick)) {
g_snprintf(s, 511, "%s%s.otr_keys", global.conf->configdir, irc->user->nick);
e = otrl_privkey_read(irc->otr->us, s);
if (e && e != enoent) {
irc_rootmsg(irc, "otr load: %s: %s", s, gcry_strerror(e));
}
g_snprintf(s, 511, "%s%s.otr_fprints", global.conf->configdir, irc->user->nick);
e = otrl_privkey_read_fingerprints(irc->otr->us, s, NULL, NULL);
if (e && e != enoent) {
irc_rootmsg(irc, "otr load: %s: %s", s, gcry_strerror(e));
}
g_snprintf(s, 511, "%s%s.otr_instags", global.conf->configdir, irc->user->nick);
e = otrl_instag_read(irc->otr->us, s);
if (e && e != enoent) {
irc_rootmsg(irc, "otr load: %s: %s", s, gcry_strerror(e));
}
}
/* check for otr keys on all accounts */
for (a = irc->b->accounts; a; a = a->next) {
kg = otr_check_for_key(a) || kg;
}
if (kg) {
irc_rootmsg(irc, "Notice: "
"The accounts above do not have OTR encryption keys associated with them, yet. "
"These keys are now being generated in the background. "
"You will be notified as they are completed. "
"It is not necessary to wait; "
"BitlBee can be used normally during key generation. "
"You may safely ignore this message if you don't know what OTR is. ;)");
}
}
void otr_save(irc_t *irc)
{
char s[512];
gcry_error_t e;
if (strsane(irc->user->nick)) {
g_snprintf(s, 511, "%s%s.otr_fprints", global.conf->configdir, irc->user->nick);
e = otrl_privkey_write_fingerprints(irc->otr->us, s);
if (e) {
irc_rootmsg(irc, "otr save: %s: %s", s, gcry_strerror(e));
}
chmod(s, 0600);
}
}
void otr_remove(const char *nick)
{
char s[512];
if (strsane(nick)) {
g_snprintf(s, 511, "%s%s.otr_keys", global.conf->configdir, nick);
unlink(s);
g_snprintf(s, 511, "%s%s.otr_fprints", global.conf->configdir, nick);
unlink(s);
}
}
void otr_rename(const char *onick, const char *nnick)
{
char s[512], t[512];
if (strsane(nnick) && strsane(onick)) {
g_snprintf(s, 511, "%s%s.otr_keys", global.conf->configdir, onick);
g_snprintf(t, 511, "%s%s.otr_keys", global.conf->configdir, nnick);
rename(s, t);
g_snprintf(s, 511, "%s%s.otr_fprints", global.conf->configdir, onick);
g_snprintf(t, 511, "%s%s.otr_fprints", global.conf->configdir, nnick);
rename(s, t);
}
}
int otr_check_for_key(account_t *a)
{
irc_t *irc = a->bee->ui_data;
OtrlPrivKey *k;
/* don't do OTR on certain (not classic IM) protocols, e.g. twitter */
if (a->prpl->options & OPT_NOOTR) {
return 0;
}
k = otrl_privkey_find(irc->otr->us, a->user, a->prpl->name);
if (k) {
irc_rootmsg(irc, "otr: %s/%s ready", a->user, a->prpl->name);
return 0;
}
if (keygen_in_progress(irc, a->user, a->prpl->name)) {
irc_rootmsg(irc, "otr: keygen for %s/%s already in progress", a->user, a->prpl->name);
return 0;
} else {
irc_rootmsg(irc, "otr: starting background keygen for %s/%s", a->user, a->prpl->name);
otr_keygen(irc, a->user, a->prpl->name);
return 1;
}
}
char *otr_filter_msg_in(irc_user_t *iu, char *msg, int flags)
{
int ignore_msg;
char *newmsg = NULL;
OtrlTLV *tlvs = NULL;
irc_t *irc = iu->irc;
struct im_connection *ic = iu->bu->ic;
/* don't do OTR on certain (not classic IM) protocols, e.g. twitter */
if (ic->acc->prpl->options & OPT_NOOTR ||
iu->bu->flags & BEE_USER_NOOTR) {
return msg;
}
ignore_msg = otrl_message_receiving(irc->otr->us, &otr_ops, ic,
ic->acc->user, ic->acc->prpl->name, iu->bu->handle, msg, &newmsg,
&tlvs, NULL, NULL, NULL);
if (tlvs) {
otrl_tlv_free(tlvs);
}
if (ignore_msg) {
/* this was an internal OTR protocol message */
return NULL;
} else if (!newmsg) {
/* this was a non-OTR message */
return otr_filter_colors(msg);
} else {
/* we're done with the original msg, which will be caller-freed. */
return newmsg;
}
}
char *otr_filter_msg_out(irc_user_t *iu, char *msg, int flags)
{
int st;
char *otrmsg = NULL;
ConnContext *ctx = NULL;
irc_t *irc = iu->irc;
struct im_connection *ic = iu->bu->ic;
otrl_instag_t instag = OTRL_INSTAG_BEST; // XXX?
/* NB: in libotr 4.0.0 OTRL_INSTAG_RECENT will cause a null-pointer deref
* in otrl_message_sending with newly-added OTR contexts.
*/
/* don't do OTR on certain (not classic IM) protocols, e.g. twitter */
if (ic->acc->prpl->options & OPT_NOOTR ||
iu->bu->flags & BEE_USER_NOOTR) {
return msg;
}
st = otrl_message_sending(irc->otr->us, &otr_ops, ic,
ic->acc->user, ic->acc->prpl->name, iu->bu->handle, instag,
msg, NULL, &otrmsg, OTRL_FRAGMENT_SEND_ALL_BUT_LAST, &ctx, NULL, NULL);
if (otrmsg && otrmsg != msg) {
/* libotr wants us to replace our message */
/* NB: caller will free old msg */
msg = st ? NULL : g_strdup(otrmsg);
otrl_message_free(otrmsg);
}
if (st) {
irc_usernotice(iu, "otr: error handling outgoing message: %d", st);
msg = NULL; /* do not send plaintext! */
}
return msg;
}
static const struct irc_plugin otr_plugin =
{
otr_irc_new,
otr_irc_free,
otr_filter_msg_out,
otr_filter_msg_in,
otr_load,
otr_save,
otr_remove,
};
static void cmd_otr(irc_t *irc, char **args)
{
const command_t *cmd;
if (!args[0]) {
return;
}
if (!args[1]) {
return;
}
for (cmd = otr_commands; cmd->command; cmd++) {
if (strcmp(cmd->command, args[1]) == 0) {
break;
}
}
if (!cmd->command) {
irc_rootmsg(irc, "%s: unknown subcommand \"%s\", see \x02help otr\x02",
args[0], args[1]);
return;
}
if (!args[cmd->required_parameters + 1]) {
irc_rootmsg(irc, "%s %s: not enough arguments (%d req.)",
args[0], args[1], cmd->required_parameters);
return;
}
cmd->execute(irc, args + 1);
}
/*** OTR "MessageAppOps" callbacks for global.otr_ui: ***/
OtrlPolicy op_policy(void *opdata, ConnContext *context)
{
struct im_connection *ic = check_imc(opdata, context->accountname, context->protocol);
irc_t *irc = ic->bee->ui_data;
const char *p;
/* policy override during keygen: if we're missing the key for context but are currently
generating it, then that's as much as we can do. => temporarily return NEVER. */
if (keygen_in_progress(irc, context->accountname, context->protocol) &&
!otrl_privkey_find(irc->otr->us, context->accountname, context->protocol)) {
return OTRL_POLICY_NEVER;
}
p = set_getstr(&ic->bee->set, "otr_policy");
if (!strcmp(p, "never")) {
return OTRL_POLICY_NEVER;
}
if (!strcmp(p, "opportunistic")) {
return OTRL_POLICY_OPPORTUNISTIC;
}
if (!strcmp(p, "manual")) {
return OTRL_POLICY_MANUAL;
}
if (!strcmp(p, "always")) {
return OTRL_POLICY_ALWAYS;
}
return OTRL_POLICY_OPPORTUNISTIC;
}
void op_create_privkey(void *opdata, const char *accountname,
const char *protocol)
{
struct im_connection *ic = check_imc(opdata, accountname, protocol);
irc_t *irc = ic->bee->ui_data;
/* will fail silently if keygen already in progress */
otr_keygen(irc, accountname, protocol);
}
int op_is_logged_in(void *opdata, const char *accountname,
const char *protocol, const char *recipient)
{
struct im_connection *ic = check_imc(opdata, accountname, protocol);
bee_user_t *bu;
/* lookup the irc_user_t for the given recipient */
bu = bee_user_by_handle(ic->bee, ic, recipient);
if (bu) {
if (bu->flags & BEE_USER_ONLINE) {
return 1;
} else {
return 0;
}
} else {
return -1;
}
}
void op_inject_message(void *opdata, const char *accountname,
const char *protocol, const char *recipient, const char *message)
{
struct im_connection *ic = check_imc(opdata, accountname, protocol);
irc_t *irc = ic->bee->ui_data;
if (strcmp(accountname, recipient) == 0) {
/* huh? injecting messages to myself? */
irc_rootmsg(irc, "note to self: %s", message);
} else {
/* need to drop some consts here :-( */
/* TODO: get flags into op_inject_message?! */
ic->acc->prpl->buddy_msg(ic, (char *) recipient, (char *) message, 0);
/* ignoring return value :-/ */
}
}
void op_new_fingerprint(void *opdata, OtrlUserState us,
const char *accountname, const char *protocol,
const char *username, unsigned char fingerprint[20])
{
struct im_connection *ic = check_imc(opdata, accountname, protocol);
irc_t *irc = ic->bee->ui_data;
irc_user_t *u = peeruser(irc, username, protocol);
char hunam[45]; /* anybody looking? ;-) */
otrl_privkey_hash_to_human(hunam, fingerprint);
if (u) {
irc_usernotice(u, "new fingerprint: %s", hunam);
} else {
/* this case shouldn't normally happen */
irc_rootmsg(irc, "new fingerprint for %s/%s: %s",
username, protocol, hunam);
}
}
void op_write_fingerprints(void *opdata)
{
struct im_connection *ic = (struct im_connection *) opdata;
irc_t *irc = ic->bee->ui_data;
otr_save(irc);
}
void op_gone_secure(void *opdata, ConnContext *context)
{
struct im_connection *ic =
check_imc(opdata, context->accountname, context->protocol);
irc_user_t *u;
irc_t *irc = ic->bee->ui_data;
u = peeruser(irc, context->username, context->protocol);
if (!u) {
log_message(LOGLVL_ERROR,
"BUG: otr.c: op_gone_secure: irc_user_t for %s/%s/%s not found!",
context->username, context->protocol, context->accountname);
return;
}
otr_update_uflags(context, u);
if (!otr_update_modeflags(irc, u)) {
char *trust = u->flags & IRC_USER_OTR_TRUSTED ? "trusted" : "untrusted!";
irc_usernotice(u, "conversation is now off the record (%s)", trust);
}
}
void op_gone_insecure(void *opdata, ConnContext *context)
{
struct im_connection *ic =
check_imc(opdata, context->accountname, context->protocol);
irc_t *irc = ic->bee->ui_data;
irc_user_t *u;
u = peeruser(irc, context->username, context->protocol);
if (!u) {
log_message(LOGLVL_ERROR,
"BUG: otr.c: op_gone_insecure: irc_user_t for %s/%s/%s not found!",
context->username, context->protocol, context->accountname);
return;
}
otr_update_uflags(context, u);
if (!otr_update_modeflags(irc, u)) {
irc_usernotice(u, "conversation is now in cleartext");
}
}
void op_still_secure(void *opdata, ConnContext *context, int is_reply)
{
struct im_connection *ic =
check_imc(opdata, context->accountname, context->protocol);
irc_t *irc = ic->bee->ui_data;
irc_user_t *u;
u = peeruser(irc, context->username, context->protocol);
if (!u) {
log_message(LOGLVL_ERROR,
"BUG: otr.c: op_still_secure: irc_user_t for %s/%s/%s not found!",
context->username, context->protocol, context->accountname);
return;
}
otr_update_uflags(context, u);
if (!otr_update_modeflags(irc, u)) {
char *trust = u->flags & IRC_USER_OTR_TRUSTED ? "trusted" : "untrusted!";
irc_usernotice(u, "otr connection has been refreshed (%s)", trust);
}
}
int op_max_message_size(void *opdata, ConnContext *context)
{
struct im_connection *ic =
check_imc(opdata, context->accountname, context->protocol);
return ic->acc->prpl->mms;
}
const char *op_account_name(void *opdata, const char *account, const char *protocol)
{
struct im_connection *ic = (struct im_connection *) opdata;
irc_t *irc = ic->bee->ui_data;
return peernick(irc, account, protocol);
}
void op_create_instag(void *opdata, const char *account, const char *protocol)
{
struct im_connection *ic =
check_imc(opdata, account, protocol);
irc_t *irc = ic->bee->ui_data;
gcry_error_t e;
char s[512];
g_snprintf(s, 511, "%s%s.otr_instags", global.conf->configdir,
irc->user->nick);
e = otrl_instag_generate(irc->otr->us, s, account, protocol);
if (e) {
irc_rootmsg(irc, "otr: %s/%s: otrl_instag_generate failed: %s",
account, protocol, gcry_strerror(e));
}
}
static char *otr_filter_colors(char *msg)
{
return str_reject_chars(msg, "\x02\x03", '?');
}
/* returns newly allocated string */
static char *otr_color_encrypted(char *msg, char *color, gboolean is_query) {
char **lines;
GString *out;
int i;
lines = g_strsplit(msg, "\n", -1);
/* up to 4 extra chars per line (e.g., '\x03' + ("03"|"05") + ' ') */
out = g_string_sized_new(strlen(msg) + g_strv_length(lines) * 4);
for (i = 0; lines[i]; i++) {
char *line = lines[i];
if (i != 0) {
g_string_append_c(out, '\n');
} else if (is_query && g_strncasecmp(line, "/me ", 4) == 0) {
/* in a query window, keep "/me " uncolored at the beginning */
line += 4;
g_string_append(out, "/me ");
}
g_string_append_c(out, '\x03');
g_string_append(out, color);
/* comma in first place could mess with the color code */
if (line[0] == ',') {
/* insert a space between color spec and message */
g_string_append_c(out, ' ');
}
g_string_append(out, otr_filter_colors(line));
}
g_strfreev(lines);
return g_string_free(out, FALSE);
}
void op_convert_msg(void *opdata, ConnContext *ctx, OtrlConvertType typ,
char **dst, const char *src)
{
struct im_connection *ic =
check_imc(opdata, ctx->accountname, ctx->protocol);
irc_t *irc = ic->bee->ui_data;
irc_user_t *iu = peeruser(irc, ctx->username, ctx->protocol);
if (typ == OTRL_CONVERT_RECEIVING) {
char *msg = g_strdup(src);
/* HTML decoding */
if (set_getbool(&ic->bee->set, "otr_does_html") &&
!(ic->flags & OPT_DOES_HTML) &&
set_getbool(&ic->bee->set, "strip_html")) {
strip_html(msg);
/* msg is borrowed by *dst (unless the next if decides to color it) */
*dst = msg;
}
/* coloring */
if (set_getbool(&ic->bee->set, "otr_color_encrypted")) {
const char *trust = ctx->active_fingerprint->trust;
char *color = (trust && *trust) ? OTR_COLOR_TRUSTED : OTR_COLOR_UNTRUSTED;
gboolean is_query = (irc_user_msgdest(iu) == irc->user->nick);
/* the return value of otr_color_encrypted() is borrowed by *dst */
*dst = otr_color_encrypted(msg, color, is_query);
/* this branch doesn't need msg */
g_free(msg);
}
} else {
/* HTML encoding */
/* consider OTR plaintext to be HTML if otr_does_html is set */
if (ctx && ctx->msgstate == OTRL_MSGSTATE_ENCRYPTED &&
set_getbool(&ic->bee->set, "otr_does_html") &&
(g_strncasecmp(src, "<html>", 6) != 0)) {
*dst = escape_html(src);
}
}
}
void op_convert_free(void *opdata, ConnContext *ctx, char *msg)
{
g_free(msg);
}
/* Socialist Millionaires' Protocol */
void op_handle_smp_event(void *opdata, OtrlSMPEvent ev, ConnContext *ctx,
unsigned short percent, char *question)
{
struct im_connection *ic =
check_imc(opdata, ctx->accountname, ctx->protocol);
irc_t *irc = ic->bee->ui_data;
OtrlUserState us = irc->otr->us;
irc_user_t *u = peeruser(irc, ctx->username, ctx->protocol);
if (!u) {
return;
}
switch (ev) {
case OTRL_SMPEVENT_ASK_FOR_SECRET:
irc_rootmsg(irc, "smp: initiated by %s"
" - respond with \x02otr smp %s <secret>\x02",
u->nick, u->nick);
break;
case OTRL_SMPEVENT_ASK_FOR_ANSWER:
irc_rootmsg(irc, "smp: initiated by %s with question: \x02\"%s\"\x02", u->nick,
question);
irc_rootmsg(irc, "smp: respond with \x02otr smp %s <answer>\x02",
u->nick);
break;
case OTRL_SMPEVENT_CHEATED:
irc_rootmsg(irc, "smp %s: opponent violated protocol, aborting",
u->nick);
otrl_message_abort_smp(us, &otr_ops, u->bu->ic, ctx);
otrl_sm_state_free(ctx->smstate);
break;
case OTRL_SMPEVENT_NONE:
break;
case OTRL_SMPEVENT_IN_PROGRESS:
break;
case OTRL_SMPEVENT_SUCCESS:
if (ctx->smstate->received_question) {
irc_rootmsg(irc, "smp %s: correct answer, you are trusted",
u->nick);
} else {
irc_rootmsg(irc, "smp %s: secrets proved equal, fingerprint trusted",
u->nick);
}
otrl_sm_state_free(ctx->smstate);
break;
case OTRL_SMPEVENT_FAILURE:
if (ctx->smstate->received_question) {
irc_rootmsg(irc, "smp %s: wrong answer, you are not trusted",
u->nick);
} else {
irc_rootmsg(irc, "smp %s: secrets did not match, fingerprint not trusted",
u->nick);
}
otrl_sm_state_free(ctx->smstate);
break;
case OTRL_SMPEVENT_ABORT:
irc_rootmsg(irc, "smp: received abort from %s", u->nick);
otrl_sm_state_free(ctx->smstate);
break;
case OTRL_SMPEVENT_ERROR:
irc_rootmsg(irc, "smp %s: protocol error, aborting",
u->nick);
otrl_message_abort_smp(us, &otr_ops, u->bu->ic, ctx);
otrl_sm_state_free(ctx->smstate);
break;
}
}
void op_handle_msg_event(void *opdata, OtrlMessageEvent ev, ConnContext *ctx,
const char *message, gcry_error_t err)
{
switch (ev) {
case OTRL_MSGEVENT_ENCRYPTION_REQUIRED:
display_otr_message(opdata, ctx,
"policy requires encryption - message not sent");
break;
case OTRL_MSGEVENT_ENCRYPTION_ERROR:
display_otr_message(opdata, ctx,
"error during encryption - message not sent");
break;
case OTRL_MSGEVENT_CONNECTION_ENDED:
display_otr_message(opdata, ctx,
"other end has disconnected OTR - "
"close connection or reconnect!");
break;
case OTRL_MSGEVENT_SETUP_ERROR:
display_otr_message(opdata, ctx,
"OTR connection failed: %s", gcry_strerror(err));
break;
case OTRL_MSGEVENT_MSG_REFLECTED:
display_otr_message(opdata, ctx,
"received our own OTR message (!?)");
break;
case OTRL_MSGEVENT_MSG_RESENT:
display_otr_message(opdata, ctx,
"the previous message was resent");
break;
case OTRL_MSGEVENT_RCVDMSG_NOT_IN_PRIVATE:
display_otr_message(opdata, ctx,
"unexpected encrypted message received");
break;
case OTRL_MSGEVENT_RCVDMSG_UNREADABLE:
display_otr_message(opdata, ctx,
"unreadable encrypted message received");
break;
case OTRL_MSGEVENT_RCVDMSG_MALFORMED:
display_otr_message(opdata, ctx,
"malformed OTR message received");
break;
case OTRL_MSGEVENT_LOG_HEARTBEAT_RCVD:
if (global.conf->verbose) {
log_otr_message(opdata, "%s/%s: heartbeat received",
ctx->accountname, ctx->protocol);
}
break;
case OTRL_MSGEVENT_LOG_HEARTBEAT_SENT:
if (global.conf->verbose) {
log_otr_message(opdata, "%s/%s: heartbeat sent",
ctx->accountname, ctx->protocol);
}
break;
case OTRL_MSGEVENT_RCVDMSG_GENERAL_ERR:
display_otr_message(opdata, ctx,
"OTR error message received: %s", message);
break;
case OTRL_MSGEVENT_RCVDMSG_UNENCRYPTED:
display_otr_message(opdata, ctx,
"unencrypted message received: %s", message);
break;
case OTRL_MSGEVENT_RCVDMSG_UNRECOGNIZED:
display_otr_message(opdata, ctx,
"unrecognized OTR message received");
break;
case OTRL_MSGEVENT_RCVDMSG_FOR_OTHER_INSTANCE:
display_otr_message(opdata, ctx,
"OTR message for a different instance received");
break;