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#
# SSL Session Cache
#
implement SSLsession;
include "sys.m";
sys : Sys;
include "daytime.m";
daytime : Daytime;
include "sslsession.m";
# default session id timeout
TIMEOUT_SECS : con 5*60; # sec
SessionCache: adt {
db : list of ref Session;
time_out : int;
};
# The shared session cache by all ssl contexts is available for efficiently resumming
# sessions for different run time contexts.
Session_Cache : ref SessionCache;
init(): string
{
sys = load Sys Sys->PATH;
if(sys == nil)
return "sslsession: load sys module failed";
daytime = load Daytime Daytime->PATH;
if(daytime == nil)
return "sslsession: load Daytime module failed";
Session_Cache = ref SessionCache(nil, TIMEOUT_SECS);
return "";
}
Session.new(peer: string, time: int, ver: array of byte): ref Session
{
s := ref Session;
s.peer = peer;
s.connection_time = time;
s.version = array [2] of byte;
s.version[0:] = ver;
s.session_id = nil;
s.suite = nil;
s.master_secret = nil;
s.peer_certs = nil;
return s;
}
Session.duplicate(s: self ref Session): ref Session
{
new := ref Session;
new.peer = s.peer;
new.connection_time = s.connection_time;
new.version = array [len s.version] of byte;
new.version[0:] = s.version;
new.session_id = array [len s.session_id] of byte;
new.session_id[0:] = s.session_id;
new.suite = array [len s.suite] of byte;
new.suite[0:] = s.suite;
new.master_secret = array [len s.master_secret] of byte;
new.master_secret[0:] = s.master_secret;
l: list of array of byte;
pcs := s.peer_certs;
while(pcs != nil) {
a := hd pcs;
b := array [len a] of byte;
b[0:] = a;
l = b :: l;
pcs = tl pcs;
}
while(l != nil) {
new.peer_certs = (hd l) :: new.peer_certs;
l = tl l;
}
return new;
}
# Each request process should get a copy of a session. A session will be
# removed from database if it is expired. The garbage
# collector will finally remove it from memory if there are no more
# references to it.
get_session_byname(peer: string): ref Session
{
s: ref Session;
now := daytime->now(); # not accurate but more efficient
l := Session_Cache.db;
while(l != nil) {
if((hd l).peer == peer) {
s = hd l;
# TODO: remove expired session
if(now > s.connection_time+Session_Cache.time_out)
s = nil;
break;
}
l = tl l;
}
if(s == nil)
s = Session.new(peer, now, nil);
else
s = s.duplicate();
return s;
}
# replace the old by the new one
add_session(s: ref Session)
{
#old : ref Session;
#ls := Session_Cache.db;
#while(ls != nil) {
# old = hd ls;
# if(s.session_id == old.session_id) {
# # old = s;
# return;
# }
#}
# always resume the most recent
if(s != nil)
Session_Cache.db = s :: Session_Cache.db;
}
get_session_byid(session_id: array of byte): ref Session
{
s: ref Session;
now := daytime->now(); # not accurate but more efficient
l := Session_Cache.db;
while(l != nil) {
if(bytes_cmp((hd l).session_id, session_id) == 0) {
s = hd l;
# replace expired session
if(now > s.connection_time+Session_Cache.time_out)
s = Session.new(s.peer, now, nil);
else
s = s.duplicate();
break;
}
l = tl l;
}
return s;
}
set_timeout(t: int)
{
Session_Cache.time_out = t;
}
bytes_cmp(a, b: array of byte): int
{
if(len a != len b)
return -1;
n := len a;
for(i := 0; i < n; i++) {
if(a[i] != b[i])
return -1;
}
return 0;
}
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