@ -30,6 +30,10 @@ type Rule struct {
addr uint32
saddr net . IP
port uint16
uid int
gid int
uname string
gname string
}
func ( r * Rule ) String ( ) string {
@ -75,7 +79,16 @@ func (r *Rule) AddrString(redact bool) string {
type RuleList [ ] * Rule
func ( r * Rule ) match ( src net . IP , dst net . IP , dstPort uint16 , hostname string ) bool {
func ( r * Rule ) match ( src net . IP , dst net . IP , dstPort uint16 , hostname string , uid , gid int , uname , gname string ) bool {
if r . uid != - 1 && r . uid != uid {
return false
} else if r . gid != - 1 && r . gid != gid {
return false
} else if r . uname != "" && r . uname != uname {
return false
} else if r . gname != "" && r . gname != gname {
return false
}
xip := make ( net . IP , 4 )
binary . BigEndian . PutUint32 ( xip , r . addr )
@ -126,7 +139,7 @@ log.Notice("! Skipping comparison against incompatible rule types: rule src = ",
log . Notice ( "! Skipping comparison of mismatching source ips" )
continue
}
if r . match ( src , dst , dstPort , hostname {
if r . match ( src , dst , dstPort , hostname , pinfo . UID , pinfo . GID , uidToUser ( pinfo . UID ) , gidToGroup ( pinfo . GID ) ) {
log . Notice ( "+ MATCH SUCCEEDED" )
dstStr := dst . String ( )
if FirewallConfig . LogRedact {
@ -170,25 +183,66 @@ func (r *Rule) parse(s string) bool {
r . addr = noAddress
r . saddr = nil
parts := strings . Split ( s , "|" )
if len ( parts ) < 2 {
if len ( parts ) < 4 || len ( parts ) > 5 {
return false
}
if len ( parts ) >= 3 && parts [ 2 ] == "SYSTEM" {
if parts [ 2 ] == "SYSTEM" {
r . mode = RULE_MODE_SYSTEM
} else if parts [ 2 ] != "" {
return false
}
if ! r . parsePrivs ( parts [ 3 ] ) {
return false
}
//fmt.Printf("uid = %v, gid = %v, user = %v, group = %v, hostname = %v\n", r.uid, r.gid, r.uname, r.gname, r.hostname)
if len ( parts ) == 5 && len ( strings . TrimSpace ( parts [ 4 ] ) ) > 0 {
r . saddr = net . ParseIP ( parts [ 4 ] )
if len ( parts ) > 4 {
r . saddr = net . ParseIP ( parts [ 3 ] )
if r . saddr == nil {
return false
}
} else if len ( parts ) > 3 {
r . saddr = net . ParseIP ( parts [ 3 ] )
} else if len ( parts ) > 2 {
r . saddr = net . ParseIP ( parts [ 2 ] )
}
return r . parseVerb ( parts [ 0 ] ) && r . parseTarget ( parts [ 1 ] )
}
func ( r * Rule ) parsePrivs ( p string ) bool {
toks := strings . Split ( p , ":" )
if len ( toks ) > 2 {
return false
}
r . uid , r . gid = - 1 , - 1
r . uname , r . gname = "" , ""
ustr := toks [ 0 ]
uid , err := strconv . Atoi ( ustr )
if err != nil {
r . uname = ustr
} else {
r . uid = uid
}
if len ( toks ) > 1 {
gstr := toks [ 1 ]
gid , err := strconv . Atoi ( gstr )
if err != nil {
r . gname = gstr
} else {
r . gid = gid
}
}
return true
}
func ( r * Rule ) parseVerb ( v string ) bool {
switch v {
case RuleActionString [ RULE_ACTION_ALLOW ] :
@ -223,9 +277,14 @@ func (r *Rule) parseAddr(a string) bool {
// ip := net.ParseIP(a)
ip , ipnet , err := net . ParseCIDR ( a )
if err != nil || ip == nil {
return false
ip = net . ParseIP ( a )
if ip == nil {
return false
}
} else {
r . network = ipnet
}
r . network = ipnet
r . addr = binary . BigEndian . Uint32 ( ip . To4 ( ) )
return true
}
@ -332,8 +391,11 @@ func (fw *Firewall) loadRules() {
for _ , line := range strings . Split ( string ( bs ) , "\n" ) {
if strings . HasPrefix ( line , "[" ) && strings . HasSuffix ( line , "]" ) {
policy = fw . processPathLine ( line )
} else if len ( strings . TrimSpace ( line ) ) > 0 {
processRuleLine ( policy , line )
} else {
trimmed := strings . TrimSpace ( line )
if len ( trimmed ) > 0 && trimmed [ : 1 ] != "#" {
processRuleLine ( policy , trimmed )
}
}
}
}
shw
7 years ago