outposts/ldap: fix race condition when refreshing the provider
Fixes the race condition causing the crash found in #4138, which doesn't actually have anything to do with the issue itself. As far as I can work out, when the outpost refreshes its list of providers, it copies over its `boundUsers`, probably to avoid having to fetch them all again, and does so by making a shallow copy of that `map`, but not the mutex associated with it. It now has multiple references to the same map, each protected by a different mutex, which under certain conditions can cause a `concurrent map read and map write` error. This fix copies the map contents instead of make a shallow copy. Signed-off-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>
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@ -9,6 +9,7 @@ import (
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"github.com/go-openapi/strfmt"
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"github.com/nmcclain/ldap"
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log "github.com/sirupsen/logrus"
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"goauthentik.io/api/v3"
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"goauthentik.io/internal/constants"
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"goauthentik.io/internal/outpost/ldap/bind"
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@ -39,7 +40,7 @@ type ProviderInstance struct {
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outpostName string
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outpostPk int32
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searchAllowedGroups []*strfmt.UUID
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boundUsersMutex sync.RWMutex
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boundUsersMutex *sync.RWMutex
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boundUsers map[string]*flags.UserFlags
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uidStartNumber int32
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@ -9,6 +9,7 @@ import (
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"github.com/go-openapi/strfmt"
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log "github.com/sirupsen/logrus"
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"goauthentik.io/api/v3"
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"goauthentik.io/internal/outpost/ldap/bind"
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directbind "goauthentik.io/internal/outpost/ldap/bind/direct"
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@ -56,11 +57,12 @@ func (ls *LDAPServer) Refresh() error {
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// Get existing instance so we can transfer boundUsers
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existing := ls.getCurrentProvider(provider.Pk)
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usersMutex := &sync.RWMutex{}
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users := make(map[string]*flags.UserFlags)
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if existing != nil {
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existing.boundUsersMutex.RLock()
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usersMutex = existing.boundUsersMutex
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// Shallow copy, no need to lock
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users = existing.boundUsers
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existing.boundUsersMutex.RUnlock()
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}
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providers[idx] = &ProviderInstance{
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@ -72,7 +74,7 @@ func (ls *LDAPServer) Refresh() error {
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authenticationFlowSlug: provider.BindFlowSlug,
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invalidationFlowSlug: invalidationFlow,
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searchAllowedGroups: []*strfmt.UUID{(*strfmt.UUID)(provider.SearchGroup.Get())},
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boundUsersMutex: sync.RWMutex{},
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boundUsersMutex: usersMutex,
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boundUsers: users,
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s: ls,
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log: logger,
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