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prompt.go
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prompt.go
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package sgfw
import (
"fmt"
"os/user"
"strconv"
"sync"
"github.com/godbus/dbus"
)
func newPrompter(conn *dbus.Conn) *prompter {
p := new(prompter)
p.cond = sync.NewCond(&p.lock)
p.dbusObj = conn.Object("com.subgraph.FirewallPrompt", "/com/subgraph/FirewallPrompt")
p.policyMap = make(map[string]*Policy)
go p.promptLoop()
return p
}
type prompter struct {
dbusObj dbus.BusObject
lock sync.Mutex
cond *sync.Cond
policyMap map[string]*Policy
policyQueue []*Policy
}
func (p *prompter) prompt(policy *Policy) {
p.lock.Lock()
defer p.lock.Unlock()
_, ok := p.policyMap[policy.path]
if ok {
return
}
p.policyMap[policy.path] = policy
p.policyQueue = append(p.policyQueue, policy)
p.cond.Signal()
}
func (p *prompter) promptLoop() {
p.lock.Lock()
for {
for p.processNextPacket() {
}
p.cond.Wait()
}
}
func (p *prompter) processNextPacket() bool {
pc := p.nextConnection()
if pc == nil {
return false
}
p.lock.Unlock()
defer p.lock.Lock()
p.processConnection(pc)
return true
}
func (p *prompter) processConnection(pc pendingConnection) {
var scope int32
var rule string
addr := pc.hostname()
if addr == "" {
addr = pc.dst().String()
}
policy := pc.policy()
call := p.dbusObj.Call("com.subgraph.FirewallPrompt.RequestPrompt", 0,
policy.application,
policy.icon,
policy.path,
addr,
int32(pc.dstPort()),
pc.dst().String(),
uidToUser(pc.procInfo().UID),
int32(pc.procInfo().Pid),
FirewallConfig.PromptExpanded,
FirewallConfig.PromptExpert,
int32(FirewallConfig.DefaultActionID))
err := call.Store(&scope, &rule)
if err != nil {
log.Warningf("Error sending dbus RequestPrompt message: %v", err)
policy.removePending(pc)
pc.drop()
return
}
r, err := policy.parseRule(rule, false)
if err != nil {
log.Warningf("Error parsing rule string returned from dbus RequestPrompt: %v", err)
policy.removePending(pc)
pc.drop()
return
}
fscope := FilterScope(scope)
if fscope == APPLY_SESSION {
r.mode = RULE_MODE_SESSION
}
if !policy.processNewRule(r, fscope) {
p.lock.Lock()
defer p.lock.Unlock()
p.removePolicy(pc.policy())
}
if fscope == APPLY_FOREVER {
policy.fw.saveRules()
}
}
func (p *prompter) nextConnection() pendingConnection {
for {
if len(p.policyQueue) == 0 {
return nil
}
policy := p.policyQueue[0]
pc := policy.nextPending()
if pc == nil {
p.removePolicy(policy)
} else {
return pc
}
}
}
func (p *prompter) removePolicy(policy *Policy) {
newQueue := make([]*Policy, 0, len(p.policyQueue)-1)
for _, pol := range p.policyQueue {
if pol != policy {
newQueue = append(newQueue, pol)
}
}
p.policyQueue = newQueue
delete(p.policyMap, policy.path)
}
var userMap = make(map[int]string)
func lookupUser(uid int) string {
u, err := user.LookupId(strconv.Itoa(uid))
if err != nil {
return fmt.Sprintf("%d", uid)
}
return u.Name
}
func uidToUser(uid int) string {
uname, ok := userMap[uid]
if ok {
return uname
}
uname = lookupUser(uid)
userMap[uid] = uname
return uname
}