X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=secnet.git;a=blobdiff_plain;f=site.c;h=909e8e9fa5a9903967fc700d93b4c2cabf70a620;hp=98bd6b678a7bc73f0d2b903e2931e560cc4933f8;hb=6af9a9842664ba88d89a67b300c1b0970bcf43ee;hpb=7e29719ec13da8db08c7aa4753d958141967bf0a diff --git a/site.c b/site.c index 98bd6b6..909e8e9 100644 --- a/site.c +++ b/site.c @@ -89,6 +89,8 @@ #define SITE_SENTMSG5 7 #define SITE_WAIT 8 +int32_t site_max_start_pad = 4*4; + static cstring_t state_name(uint32_t state) { switch (state) { @@ -239,11 +241,13 @@ struct site { struct random_if *random; struct rsaprivkey_if *privkey; struct rsapubkey_if *pubkey; - struct transform_if *transform; + struct transform_if **transforms; + int ntransforms; struct dh_if *dh; struct hash_if *hash; uint32_t index; /* Index of this site */ + uint32_t local_capabilities; int32_t setup_retries; /* How many times to send setup packets */ int32_t setup_retry_interval; /* Initial timeout for setup packets */ int32_t wait_timeout; /* How long to wait if setup unsuccessful */ @@ -275,6 +279,8 @@ struct site { packet; we keep trying to continue the exchange, and have to timeout before we can listen for another setup packet); perhaps we should keep a list of 'bad' sources for setup packets. */ + uint32_t remote_capabilities; + struct transform_if *chosen_transform; uint32_t setup_session_id; transport_peers setup_peers; uint8_t localN[NONCELEN]; /* Nonces for key exchange */ @@ -285,10 +291,12 @@ struct site { uint64_t timeout; /* Timeout for current state */ uint8_t *dhsecret; uint8_t *sharedsecret; - uint32_t sharedsecretlen; + uint32_t sharedsecretlen, sharedsecretallocd; struct transform_inst_if *new_transform; /* For key setup/verify */ }; +static void slog(struct site *st, uint32_t event, cstring_t msg, ...) +FORMAT(printf,3,4); static void slog(struct site *st, uint32_t event, cstring_t msg, ...) { va_list ap; @@ -314,7 +322,7 @@ static void slog(struct site *st, uint32_t event, cstring_t msg, ...) } vsnprintf(buf,sizeof(buf),msg,ap); - st->log->log(st->log->st,class,"%s: %s",st->tunname,buf); + slilog(st->log,class,"%s: %s",st->tunname,buf); } va_end(ap); } @@ -332,11 +340,42 @@ static bool_t enter_new_state(struct site *st,uint32_t next); static void enter_state_wait(struct site *st); static void activate_new_key(struct site *st); +static bool_t is_transform_valid(struct transform_inst_if *transform) +{ + return transform && transform->valid(transform->st); +} + static bool_t current_valid(struct site *st) { - return st->current.transform->valid(st->current.transform->st); + return is_transform_valid(st->current.transform); +} + +#define DEFINE_CALL_TRANSFORM(fwdrev) \ +static int call_transform_##fwdrev(struct site *st, \ + struct transform_inst_if *transform, \ + struct buffer_if *buf, \ + const char **errmsg) \ +{ \ + if (!is_transform_valid(transform)) { \ + *errmsg="transform not set up"; \ + return 1; \ + } \ + return transform->fwdrev(transform->st,buf,errmsg); \ } +DEFINE_CALL_TRANSFORM(forwards) +DEFINE_CALL_TRANSFORM(reverse) + +static void dispose_transform(struct transform_inst_if **transform_var) +{ + struct transform_inst_if *transform=*transform_var; + if (transform) { + transform->delkey(transform->st); + transform->destroy(transform->st); + } + *transform_var = 0; +} + #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0) #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0) #define CHECK_TYPE(b,t) do { uint32_t type; \ @@ -347,8 +386,7 @@ static bool_t current_valid(struct site *st) struct parsedname { int32_t len; uint8_t *name; - int32_t extrainfo_len; - uint8_t *extrainfo; + struct buffer_if extrainfo; }; struct msg { @@ -357,6 +395,8 @@ struct msg { uint32_t source; struct parsedname remote; struct parsedname local; + uint32_t remote_capabilities; + int capab_transformnum; uint8_t *nR; uint8_t *nL; int32_t pklen; @@ -366,6 +406,63 @@ struct msg { char *sig; }; +static void set_new_transform(struct site *st, char *pk) +{ + /* Make room for the shared key */ + st->sharedsecretlen=st->chosen_transform->keylen?:st->dh->ceil_len; + assert(st->sharedsecretlen); + if (st->sharedsecretlen > st->sharedsecretallocd) { + st->sharedsecretallocd=st->sharedsecretlen; + st->sharedsecret=realloc(st->sharedsecret,st->sharedsecretallocd); + } + if (!st->sharedsecret) fatal_perror("site:sharedsecret"); + + /* Generate the shared key */ + st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,pk, + st->sharedsecret,st->sharedsecretlen); + + /* Set up the transform */ + struct transform_if *generator=st->chosen_transform; + struct transform_inst_if *generated=generator->create(generator->st); + generated->setkey(generated->st,st->sharedsecret, + st->sharedsecretlen,st->setup_priority); + dispose_transform(&st->new_transform); + st->new_transform=generated; + + slog(st,LOG_SETUP_INIT,"key exchange negotiated transform" + " %d (capabilities ours=%#"PRIx32" theirs=%#"PRIx32")", + st->chosen_transform->capab_transformnum, + st->local_capabilities, st->remote_capabilities); +} + +struct xinfoadd { + int32_t lenpos, afternul; +}; +static void append_string_xinfo_start(struct buffer_if *buf, + struct xinfoadd *xia, + const char *str) + /* Helps construct one of the names with additional info as found + * in MSG1..4. Call this function first, then append all the + * desired extra info (not including the nul byte) to the buffer, + * then call append_string_xinfo_done. */ +{ + xia->lenpos = buf->size; + buf_append_string(buf,str); + buf_append_uint8(buf,0); + xia->afternul = buf->size; +} +static void append_string_xinfo_done(struct buffer_if *buf, + struct xinfoadd *xia) +{ + /* we just need to adjust the string length */ + if (buf->size == xia->afternul) { + /* no extra info, strip the nul too */ + buf_unappend_uint8(buf); + } else { + put_uint16(buf->start+xia->lenpos, buf->size-(xia->lenpos+2)); + } +} + /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside out using a transform of config data supplied by netlink */ static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what) @@ -381,7 +478,14 @@ static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what) (type==LABEL_MSG1?0:st->setup_session_id)); buf_append_uint32(&st->buffer,st->index); buf_append_uint32(&st->buffer,type); - buf_append_string(&st->buffer,st->localname); + + struct xinfoadd xia; + append_string_xinfo_start(&st->buffer,&xia,st->localname); + if ((st->local_capabilities & CAPAB_EARLY) || (type != LABEL_MSG1)) { + buf_append_uint32(&st->buffer,st->local_capabilities); + } + append_string_xinfo_done(&st->buffer,&xia); + buf_append_string(&st->buffer,st->remotename); memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN); if (type==LABEL_MSG1) return True; @@ -390,6 +494,9 @@ static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what) if (hacky_par_mid_failnow()) return False; + if (type==LABEL_MSG3BIS) + buf_append_uint8(&st->buffer,st->chosen_transform->capab_transformnum); + dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len); buf_append_string(&st->buffer,dhpub); free(dhpub); @@ -412,11 +519,9 @@ static bool_t unpick_name(struct buffer_if *msg, struct parsedname *nm) nm->name=buf_unprepend(msg,nm->len); uint8_t *nul=memchr(nm->name,0,nm->len); if (!nul) { - nm->extrainfo_len=0; - nm->extrainfo=0; + buffer_readonly_view(&nm->extrainfo,0,0); } else { - nm->extrainfo=nul+1; - nm->extrainfo_len=msg->start-nm->extrainfo; + buffer_readonly_view(&nm->extrainfo, nul+1, msg->start-(nul+1)); nm->len=nul-nm->name; } return True; @@ -425,6 +530,7 @@ static bool_t unpick_name(struct buffer_if *msg, struct parsedname *nm) static bool_t unpick_msg(struct site *st, uint32_t type, struct buffer_if *msg, struct msg *m) { + m->capab_transformnum=-1; m->hashstart=msg->start; CHECK_AVAIL(msg,4); m->dest=buf_unprepend_uint32(msg); @@ -432,6 +538,11 @@ static bool_t unpick_msg(struct site *st, uint32_t type, m->source=buf_unprepend_uint32(msg); CHECK_TYPE(msg,type); if (!unpick_name(msg,&m->remote)) return False; + m->remote_capabilities=0; + if (m->remote.extrainfo.size) { + CHECK_AVAIL(&m->remote.extrainfo,4); + m->remote_capabilities=buf_unprepend_uint32(&m->remote.extrainfo); + } if (!unpick_name(msg,&m->local)) return False; CHECK_AVAIL(msg,NONCELEN); m->nR=buf_unprepend(msg,NONCELEN); @@ -445,6 +556,12 @@ static bool_t unpick_msg(struct site *st, uint32_t type, CHECK_EMPTY(msg); return True; } + if (type==LABEL_MSG3BIS) { + CHECK_AVAIL(msg,1); + m->capab_transformnum = buf_unprepend_uint8(msg); + } else { + m->capab_transformnum = CAPAB_TRANSFORMNUM_ANCIENT; + } CHECK_AVAIL(msg,2); m->pklen=buf_unprepend_uint16(msg); CHECK_AVAIL(msg,m->pklen); @@ -490,7 +607,13 @@ static bool_t check_msg(struct site *st, uint32_t type, struct msg *m, *error="wrong remotely-generated nonce"; return False; } - if (type==LABEL_MSG3) return True; + /* MSG3 has complicated rules about capabilities, which are + * handled in process_msg3. */ + if (type==LABEL_MSG3 || type==LABEL_MSG3BIS) return True; + if (m->remote_capabilities!=st->remote_capabilities) { + *error="remote capabilities changed"; + return False; + } if (type==LABEL_MSG4) return True; *error="unknown message type"; return False; @@ -511,6 +634,7 @@ static bool_t process_msg1(struct site *st, struct buffer_if *msg1, transport_record_peer(st,&st->setup_peers,src,"msg1"); st->setup_session_id=m->source; + st->remote_capabilities=m->remote_capabilities; memcpy(st->remoteN,m->nR,NONCELEN); return True; } @@ -533,6 +657,30 @@ static bool_t process_msg2(struct site *st, struct buffer_if *msg2, return False; } st->setup_session_id=m.source; + st->remote_capabilities=m.remote_capabilities; + + /* Select the transform to use */ + + uint32_t remote_transforms = st->remote_capabilities & CAPAB_TRANSFORM_MASK; + if (!remote_transforms) + /* old secnets only had this one transform */ + remote_transforms = 1UL << CAPAB_TRANSFORMNUM_ANCIENT; + + struct transform_if *ti; + int i; + for (i=0; intransforms; i++) { + ti=st->transforms[i]; + if ((1UL << ti->capab_transformnum) & remote_transforms) + goto transform_found; + } + slog(st,LOG_ERROR,"no transforms in common" + " (us %#"PRIx32"; them: %#"PRIx32")", + st->local_capabilities & CAPAB_TRANSFORM_MASK, + remote_transforms); + return False; + transform_found: + st->chosen_transform=ti; + memcpy(st->remoteN,m.nR,NONCELEN); return True; } @@ -542,22 +690,49 @@ static bool_t generate_msg3(struct site *st) /* Now we have our nonce and their nonce. Think of a secret key, and create message number 3. */ st->random->generate(st->random->st,st->dh->len,st->dhsecret); - return generate_msg(st,LABEL_MSG3,"site:MSG3"); + return generate_msg(st, + (st->remote_capabilities & CAPAB_TRANSFORM_MASK + ? LABEL_MSG3BIS : LABEL_MSG3), + "site:MSG3"); } static bool_t process_msg3(struct site *st, struct buffer_if *msg3, - const struct comm_addr *src) + const struct comm_addr *src, uint32_t msgtype) { struct msg m; uint8_t *hash; void *hst; cstring_t err; - if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False; - if (!check_msg(st,LABEL_MSG3,&m,&err)) { + assert(msgtype==LABEL_MSG3 || msgtype==LABEL_MSG3BIS); + + if (!unpick_msg(st,msgtype,msg3,&m)) return False; + if (!check_msg(st,msgtype,&m,&err)) { slog(st,LOG_SEC,"msg3: %s",err); return False; } + uint32_t capab_adv_late = m.remote_capabilities + & ~st->remote_capabilities & CAPAB_EARLY; + if (capab_adv_late) { + slog(st,LOG_SEC,"msg3 impermissibly adds early capability flag(s)" + " %#"PRIx32" (was %#"PRIx32", now %#"PRIx32")", + capab_adv_late, st->remote_capabilities, m.remote_capabilities); + return False; + } + st->remote_capabilities|=m.remote_capabilities; + + struct transform_if *ti; + int i; + for (i=0; intransforms; i++) { + ti=st->transforms[i]; + if (ti->capab_transformnum == m.capab_transformnum) + goto transform_found; + } + slog(st,LOG_SEC,"peer chose unknown-to-us transform %d!", + m.capab_transformnum); + return False; + transform_found: + st->chosen_transform=ti; /* Check signature and store g^x mod m */ hash=safe_malloc(st->hash->len, "process_msg3"); @@ -578,13 +753,8 @@ static bool_t process_msg3(struct site *st, struct buffer_if *msg3, /* Invent our DH secret key */ st->random->generate(st->random->st,st->dh->len,st->dhsecret); - /* Generate the shared key */ - st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk, - st->sharedsecret,st->sharedsecretlen); - - /* Set up the transform */ - st->new_transform->setkey(st->new_transform->st,st->sharedsecret, - st->sharedsecretlen,st->setup_priority); + /* Generate the shared key and set up the transform */ + set_new_transform(st,m.pk); return True; } @@ -626,12 +796,9 @@ static bool_t process_msg4(struct site *st, struct buffer_if *msg4, /* Terminate their DH public key with a '0' */ m.pk[m.pklen]=0; - /* Generate the shared key */ - st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk, - st->sharedsecret,st->sharedsecretlen); - /* Set up the transform */ - st->new_transform->setkey(st->new_transform->st,st->sharedsecret, - st->sharedsecretlen,st->setup_priority); + + /* Generate the shared key and set up the transform */ + set_new_transform(st,m.pk); return True; } @@ -661,12 +828,13 @@ static bool_t generate_msg5(struct site *st) BUF_ALLOC(&st->buffer,"site:MSG5"); /* We are going to add four words to the message */ - buffer_init(&st->buffer,st->transform->max_start_pad+(4*4)); + buffer_init(&st->buffer,calculate_max_start_pad()); /* Give the netlink code an opportunity to put its own stuff in the message (configuration information, etc.) */ buf_prepend_uint32(&st->buffer,LABEL_MSG5); - st->new_transform->forwards(st->new_transform->st,&st->buffer, - &transform_err); + if (call_transform_forwards(st,st->new_transform, + &st->buffer,&transform_err)) + return False; buf_prepend_uint32(&st->buffer,LABEL_MSG5); buf_prepend_uint32(&st->buffer,st->index); buf_prepend_uint32(&st->buffer,st->setup_session_id); @@ -684,7 +852,7 @@ static bool_t process_msg5(struct site *st, struct buffer_if *msg5, if (!unpick_msg0(st,msg5,&m)) return False; - if (transform->reverse(transform->st,msg5,&transform_err)) { + if (call_transform_reverse(st,transform,msg5,&transform_err)) { /* There's a problem */ slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err); return False; @@ -707,11 +875,13 @@ static void create_msg6(struct site *st, struct transform_inst_if *transform, BUF_ALLOC(&st->buffer,"site:MSG6"); /* We are going to add four words to the message */ - buffer_init(&st->buffer,st->transform->max_start_pad+(4*4)); + buffer_init(&st->buffer,calculate_max_start_pad()); /* Give the netlink code an opportunity to put its own stuff in the message (configuration information, etc.) */ buf_prepend_uint32(&st->buffer,LABEL_MSG6); - transform->forwards(transform->st,&st->buffer,&transform_err); + int problem = call_transform_forwards(st,transform, + &st->buffer,&transform_err); + assert(!problem); buf_prepend_uint32(&st->buffer,LABEL_MSG6); buf_prepend_uint32(&st->buffer,st->index); buf_prepend_uint32(&st->buffer,session_id); @@ -719,6 +889,8 @@ static void create_msg6(struct site *st, struct transform_inst_if *transform, static bool_t generate_msg6(struct site *st) { + if (!is_transform_valid(st->new_transform)) + return False; create_msg6(st,st->new_transform,st->setup_session_id); st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */ return True; @@ -732,8 +904,7 @@ static bool_t process_msg6(struct site *st, struct buffer_if *msg6, if (!unpick_msg0(st,msg6,&m)) return False; - if (st->new_transform->reverse(st->new_transform->st, - msg6,&transform_err)) { + if (call_transform_reverse(st,st->new_transform,msg6,&transform_err)) { /* There's a problem */ slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err); return False; @@ -761,8 +932,8 @@ static bool_t decrypt_msg0(struct site *st, struct buffer_if *msg0, /* Keep a copy so we can try decrypting it with multiple keys */ buffer_copy(&st->scratch, msg0); - problem = st->current.transform->reverse(st->current.transform->st, - msg0,&transform_err); + problem = call_transform_reverse(st,st->current.transform, + msg0,&transform_err); if (!problem) { if (!st->auxiliary_is_new) delete_one_key(st,&st->auxiliary_key, @@ -773,8 +944,8 @@ static bool_t decrypt_msg0(struct site *st, struct buffer_if *msg0, goto skew; buffer_copy(msg0, &st->scratch); - problem = st->auxiliary_key.transform->reverse - (st->auxiliary_key.transform->st,msg0,&auxkey_err); + problem = call_transform_reverse(st,st->auxiliary_key.transform, + msg0,&auxkey_err); if (problem==0) { slog(st,LOG_DROP,"processing packet which uses auxiliary key"); if (st->auxiliary_is_new) { @@ -799,8 +970,8 @@ static bool_t decrypt_msg0(struct site *st, struct buffer_if *msg0, if (st->state==SITE_SENTMSG5) { buffer_copy(msg0, &st->scratch); - problem = st->new_transform->reverse(st->new_transform->st, - msg0,&newkey_err); + problem = call_transform_reverse(st,st->new_transform, + msg0,&newkey_err); if (!problem) { /* It looks like we didn't get the peer's MSG6 */ /* This is like a cut-down enter_new_state(SITE_RUN) */ @@ -859,9 +1030,9 @@ static bool_t process_msg0(struct site *st, struct buffer_if *msg0, static void dump_packet(struct site *st, struct buffer_if *buf, const struct comm_addr *addr, bool_t incoming) { - uint32_t dest=ntohl(*(uint32_t *)buf->start); - uint32_t source=ntohl(*(uint32_t *)(buf->start+4)); - uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8)); + uint32_t dest=get_uint32(buf->start); + uint32_t source=get_uint32(buf->start+4); + uint32_t msgtype=get_uint32(buf->start+8); if (st->log_events & LOG_DUMP) slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:", @@ -890,8 +1061,8 @@ static bool_t send_msg(struct site *st) t=st->auxiliary_key.transform; st->auxiliary_key.transform=st->new_transform; st->new_transform=t; + dispose_transform(&st->new_transform); - t->delkey(t->st); st->auxiliary_is_new=1; st->auxiliary_key.key_timeout=st->now+st->key_lifetime; st->auxiliary_renegotiate_key_time=st->now+st->key_renegotiate_time; @@ -960,8 +1131,8 @@ static void activate_new_key(struct site *st) st->auxiliary_key.transform=st->current.transform; st->current.transform=st->new_transform; st->new_transform=t; + dispose_transform(&st->new_transform); - t->delkey(t->st); st->timeout=0; st->auxiliary_is_new=0; st->auxiliary_key.key_timeout=st->current.key_timeout; @@ -977,9 +1148,9 @@ static void activate_new_key(struct site *st) static void delete_one_key(struct site *st, struct data_key *key, cstring_t reason, cstring_t which, uint32_t loglevel) { - if (!key->transform->valid(key->transform->st)) return; + if (!is_transform_valid(key->transform)) return; if (reason) slog(st,loglevel,"%s deleted (%s)",which,reason); - key->transform->delkey(key->transform->st); + dispose_transform(&key->transform); key->key_timeout=0; } @@ -1004,7 +1175,7 @@ static void enter_state_stop(struct site *st) st->state=SITE_STOP; st->timeout=0; delete_keys(st,"entering state STOP",LOG_TIMEOUT_KEY); - st->new_transform->delkey(st->new_transform->st); + dispose_transform(&st->new_transform); } static void set_link_quality(struct site *st) @@ -1034,7 +1205,7 @@ static void enter_state_run(struct site *st) transport_peers_clear(st,&st->setup_peers); memset(st->localN,0,NONCELEN); memset(st->remoteN,0,NONCELEN); - st->new_transform->delkey(st->new_transform->st); + dispose_transform(&st->new_transform); memset(st->dhsecret,0,st->dh->len); memset(st->sharedsecret,0,st->sharedsecretlen); set_link_quality(st); @@ -1125,16 +1296,18 @@ static bool_t send_msg7(struct site *st, cstring_t reason) if (current_valid(st) && st->buffer.free && transport_peers_valid(&st->peers)) { BUF_ALLOC(&st->buffer,"site:MSG7"); - buffer_init(&st->buffer,st->transform->max_start_pad+(4*3)); + buffer_init(&st->buffer,calculate_max_start_pad()); buf_append_uint32(&st->buffer,LABEL_MSG7); buf_append_string(&st->buffer,reason); - st->current.transform->forwards(st->current.transform->st, - &st->buffer, &transform_err); + if (call_transform_forwards(st, st->current.transform, + &st->buffer, &transform_err)) + goto free_out; buf_prepend_uint32(&st->buffer,LABEL_MSG0); buf_prepend_uint32(&st->buffer,st->index); buf_prepend_uint32(&st->buffer,st->current.remote_session_id); transport_xmit(st,&st->peers,&st->buffer,True); BUF_FREE(&st->buffer); + free_out: return True; } return False; @@ -1231,13 +1404,15 @@ static void site_outgoing(void *sst, struct buffer_if *buf) /* Transform it and send it */ if (buf->size>0) { buf_prepend_uint32(buf,LABEL_MSG9); - st->current.transform->forwards(st->current.transform->st, - buf, &transform_err); + if (call_transform_forwards(st, st->current.transform, + buf, &transform_err)) + goto free_out; buf_prepend_uint32(buf,LABEL_MSG0); buf_prepend_uint32(buf,st->index); buf_prepend_uint32(buf,st->current.remote_session_id); transport_xmit(st,&st->peers,buf,False); } + free_out: BUF_FREE(buf); return; } @@ -1268,8 +1443,8 @@ static bool_t site_incoming(void *sst, struct buffer_if *buf, if (buf->size < 12) return False; - uint32_t msgtype=ntohl(get_uint32(buf->start+8)); - uint32_t dest=ntohl(*(uint32_t *)buf->start); + uint32_t dest=get_uint32(buf->start); + uint32_t msgtype=get_uint32(buf->start+8); struct msg named_msg; if (msgtype==LABEL_MSG1) { @@ -1350,10 +1525,11 @@ static bool_t site_incoming(void *sst, struct buffer_if *buf, } break; case LABEL_MSG3: + case LABEL_MSG3BIS: /* Setup packet: expected only in state SENTMSG2 */ if (st->state!=SITE_SENTMSG2) { slog(st,LOG_UNEXPECTED,"unexpected MSG3"); - } else if (process_msg3(st,buf,source)) { + } else if (process_msg3(st,buf,source,msgtype)) { transport_setup_msgok(st,source); enter_new_state(st,SITE_SENTMSG4); } else { @@ -1493,21 +1669,28 @@ static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context, assert(index_sequence < 0xffffffffUL); st->index = ++index_sequence; + st->local_capabilities = 0; st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc); - list_t *comms_cfg=dict_lookup(dict,"comm"); - if (!comms_cfg) cfgfatal(loc,"site","closure list \"comm\" not found\n"); - st->ncomms=list_length(comms_cfg); - st->comms=safe_malloc_ary(sizeof(*st->comms),st->ncomms,"comms"); - assert(st->ncomms); - for (i=0; incomms; i++) { - item_t *item=list_elem(comms_cfg,i); - if (item->type!=t_closure) - cfgfatal(loc,"site","comm is not a closure\n"); - closure_t *cl=item->data.closure; - if (cl->type!=CL_COMM) cfgfatal(loc,"site","comm closure wrong type\n"); - st->comms[i]=cl->interface; - } +#define GET_CLOSURE_LIST(dictkey,things,nthings,CL_TYPE) do{ \ + list_t *things##_cfg=dict_lookup(dict,dictkey); \ + if (!things##_cfg) \ + cfgfatal(loc,"site","closure list \"%s\" not found\n",dictkey); \ + st->nthings=list_length(things##_cfg); \ + st->things=safe_malloc_ary(sizeof(*st->things),st->nthings,dictkey "s"); \ + assert(st->nthings); \ + for (i=0; inthings; i++) { \ + item_t *item=list_elem(things##_cfg,i); \ + if (item->type!=t_closure) \ + cfgfatal(loc,"site","%s is not a closure\n",dictkey); \ + closure_t *cl=item->data.closure; \ + if (cl->type!=CL_TYPE) \ + cfgfatal(loc,"site","%s closure wrong type\n",dictkey); \ + st->things[i]=cl->interface; \ + } \ +}while(0) + + GET_CLOSURE_LIST("comm",comms,ncomms,CL_COMM); st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc); st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc); @@ -1520,8 +1703,7 @@ static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context, else st->remoteport=0; st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc); - st->transform= - find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc); + GET_CLOSURE_LIST("transform",transforms,ntransforms,CL_TRANSFORM); st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc); st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc); @@ -1579,38 +1761,35 @@ static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context, register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site"); st->timeout=0; + st->remote_capabilities=0; + st->chosen_transform=0; st->current.key_timeout=0; st->auxiliary_key.key_timeout=0; transport_peers_clear(st,&st->peers); transport_peers_clear(st,&st->setup_peers); /* XXX mlock these */ st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret"); - st->sharedsecretlen=st->transform->keylen?:st->dh->ceil_len; - st->sharedsecret=safe_malloc(st->sharedsecretlen,"site:sharedsecret"); - - /* We need to compute some properties of our comms */ -#define COMPUTE_WORST(pad) \ - int worst_##pad=0; \ - for (i=0; incomms; i++) { \ - int thispad=st->comms[i]->pad; \ - if (thispad > worst_##pad) \ - worst_##pad=thispad; \ + st->sharedsecretlen=st->sharedsecretallocd=0; + st->sharedsecret=0; + + for (i=0; intransforms; i++) { + struct transform_if *ti=st->transforms[i]; + uint32_t capbit = 1UL << ti->capab_transformnum; + if (st->local_capabilities & capbit) + slog(st,LOG_ERROR,"transformnum capability bit" + " %d (%#"PRIx32") reused", ti->capab_transformnum, capbit); + st->local_capabilities |= capbit; } - COMPUTE_WORST(min_start_pad) - COMPUTE_WORST(min_end_pad) /* We need to register the remote networks with the netlink device */ - st->netlink->reg(st->netlink->st, site_outgoing, st, - st->transform->max_start_pad+(4*4)+ - worst_min_start_pad, - st->transform->max_end_pad+worst_min_end_pad); + st->netlink->reg(st->netlink->st, site_outgoing, st); for (i=0; incomms; i++) st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming); - st->current.transform=st->transform->create(st->transform->st); - st->auxiliary_key.transform=st->transform->create(st->transform->st); - st->new_transform=st->transform->create(st->transform->st); + st->current.transform=0; + st->auxiliary_key.transform=0; + st->new_transform=0; st->auxiliary_is_new=0; enter_state_stop(st); @@ -1718,7 +1897,7 @@ static bool_t transport_compute_setupinit_peers(struct site *st, slog(st,LOG_SETUP_INIT, (!configured_addr ? "using only %d old peer address(es)" : "using configured address, and/or perhaps %d old peer address(es)"), - st->peers); + st->peers.npeers); /* Non-mobile peers havve st->peers.npeers==0 or ==1, since they * have transport_peers_max==1. The effect is that this code