mirror of
https://github.com/drakkan/sftpgo.git
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493 lines
13 KiB
Go
493 lines
13 KiB
Go
// Copyright (C) 2019 Nicola Murino
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published
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// by the Free Software Foundation, version 3.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package dataprovider
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import (
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"encoding/json"
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"fmt"
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"net"
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"net/netip"
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"strings"
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"sync"
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"sync/atomic"
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"github.com/yl2chen/cidranger"
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"github.com/drakkan/sftpgo/v2/internal/logger"
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"github.com/drakkan/sftpgo/v2/internal/util"
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)
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const (
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// maximum number of entries to match in memory
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// if the list contains more elements than this limit a
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// database query will be executed
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ipListMemoryLimit = 15000
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)
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var (
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inMemoryLists map[IPListType]*IPList
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)
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func init() {
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inMemoryLists = map[IPListType]*IPList{}
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}
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// IPListType is the enumerable for the supported IP list types
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type IPListType int
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// AsString returns the string representation for the list type
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func (t IPListType) AsString() string {
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switch t {
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case IPListTypeAllowList:
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return "Allow list"
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case IPListTypeDefender:
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return "Defender"
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case IPListTypeRateLimiterSafeList:
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return "Rate limiters safe list"
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default:
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return ""
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}
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}
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// Supported IP list types
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const (
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IPListTypeAllowList IPListType = iota + 1
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IPListTypeDefender
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IPListTypeRateLimiterSafeList
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)
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// Supported IP list modes
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const (
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ListModeAllow = iota + 1
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ListModeDeny
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)
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const (
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ipTypeV4 = iota + 1
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ipTypeV6
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)
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var (
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supportedIPListType = []IPListType{IPListTypeAllowList, IPListTypeDefender, IPListTypeRateLimiterSafeList}
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)
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// CheckIPListType returns an error if the provided IP list type is not valid
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func CheckIPListType(t IPListType) error {
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if !util.Contains(supportedIPListType, t) {
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return util.NewValidationError(fmt.Sprintf("invalid list type %d", t))
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}
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return nil
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}
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// IPListEntry defines an entry for the IP addresses list
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type IPListEntry struct {
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IPOrNet string `json:"ipornet"`
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Description string `json:"description,omitempty"`
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Type IPListType `json:"type"`
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Mode int `json:"mode"`
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// Defines the protocols the entry applies to
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// - 0 all the supported protocols
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// - 1 SSH
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// - 2 FTP
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// - 4 WebDAV
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// - 8 HTTP
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// Protocols can be combined
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Protocols int `json:"protocols"`
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First []byte `json:"first,omitempty"`
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Last []byte `json:"last,omitempty"`
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IPType int `json:"ip_type,omitempty"`
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// Creation time as unix timestamp in milliseconds
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CreatedAt int64 `json:"created_at"`
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// last update time as unix timestamp in milliseconds
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UpdatedAt int64 `json:"updated_at"`
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// in multi node setups we mark the rule as deleted to be able to update the cache
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DeletedAt int64 `json:"-"`
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}
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// PrepareForRendering prepares an IP list entry for rendering.
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// It hides internal fields
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func (e *IPListEntry) PrepareForRendering() {
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e.First = nil
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e.Last = nil
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e.IPType = 0
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}
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// HasProtocol returns true if the specified protocol is defined
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func (e *IPListEntry) HasProtocol(proto string) bool {
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switch proto {
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case protocolSSH:
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return e.Protocols&1 != 0
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case protocolFTP:
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return e.Protocols&2 != 0
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case protocolWebDAV:
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return e.Protocols&4 != 0
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case protocolHTTP:
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return e.Protocols&8 != 0
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default:
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return false
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}
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}
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// RenderAsJSON implements the renderer interface used within plugins
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func (e *IPListEntry) RenderAsJSON(reload bool) ([]byte, error) {
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if reload {
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entry, err := provider.ipListEntryExists(e.IPOrNet, e.Type)
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if err != nil {
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providerLog(logger.LevelError, "unable to reload IP list entry before rendering as json: %v", err)
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return nil, err
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}
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entry.PrepareForRendering()
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return json.Marshal(entry)
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}
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e.PrepareForRendering()
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return json.Marshal(e)
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}
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func (e *IPListEntry) getKey() string {
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return fmt.Sprintf("%d_%s", e.Type, e.IPOrNet)
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}
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func (e *IPListEntry) getName() string {
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return e.Type.AsString() + "-" + e.IPOrNet
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}
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func (e *IPListEntry) getFirst() netip.Addr {
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if e.IPType == ipTypeV4 {
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var a4 [4]byte
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copy(a4[:], e.First)
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return netip.AddrFrom4(a4)
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}
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var a16 [16]byte
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copy(a16[:], e.First)
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return netip.AddrFrom16(a16)
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}
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func (e *IPListEntry) getLast() netip.Addr {
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if e.IPType == ipTypeV4 {
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var a4 [4]byte
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copy(a4[:], e.Last)
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return netip.AddrFrom4(a4)
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}
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var a16 [16]byte
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copy(a16[:], e.Last)
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return netip.AddrFrom16(a16)
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}
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func (e *IPListEntry) checkProtocols() {
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for _, proto := range ValidProtocols {
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if !e.HasProtocol(proto) {
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return
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}
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}
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e.Protocols = 0
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}
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func (e *IPListEntry) validate() error {
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if err := CheckIPListType(e.Type); err != nil {
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return err
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}
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e.checkProtocols()
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switch e.Type {
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case IPListTypeDefender:
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if e.Mode < ListModeAllow || e.Mode > ListModeDeny {
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return util.NewValidationError(fmt.Sprintf("invalid list mode: %d", e.Mode))
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}
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default:
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if e.Mode != ListModeAllow {
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return util.NewValidationError("invalid list mode")
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}
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}
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e.PrepareForRendering()
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if !strings.Contains(e.IPOrNet, "/") {
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// parse as IP
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parsed, err := netip.ParseAddr(e.IPOrNet)
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if err != nil {
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return util.NewI18nError(util.NewValidationError(fmt.Sprintf("invalid IP %q", e.IPOrNet)), util.I18nErrorIPInvalid)
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}
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if parsed.Is4() {
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e.IPOrNet += "/32"
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} else if parsed.Is4In6() {
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e.IPOrNet = netip.AddrFrom4(parsed.As4()).String() + "/32"
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} else {
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e.IPOrNet += "/128"
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}
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}
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prefix, err := netip.ParsePrefix(e.IPOrNet)
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if err != nil {
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return util.NewI18nError(util.NewValidationError(fmt.Sprintf("invalid network %q: %v", e.IPOrNet, err)), util.I18nErrorNetInvalid)
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}
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prefix = prefix.Masked()
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if prefix.Addr().Is4In6() {
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e.IPOrNet = fmt.Sprintf("%s/%d", netip.AddrFrom4(prefix.Addr().As4()).String(), prefix.Bits()-96)
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}
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// TODO: to remove when the in memory ranger switch to netip
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_, _, err = net.ParseCIDR(e.IPOrNet)
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if err != nil {
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return util.NewI18nError(util.NewValidationError(fmt.Sprintf("invalid network: %v", err)), util.I18nErrorNetInvalid)
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}
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if prefix.Addr().Is4() || prefix.Addr().Is4In6() {
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e.IPType = ipTypeV4
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first := prefix.Addr().As4()
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last := util.GetLastIPForPrefix(prefix).As4()
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e.First = first[:]
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e.Last = last[:]
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} else {
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e.IPType = ipTypeV6
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first := prefix.Addr().As16()
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last := util.GetLastIPForPrefix(prefix).As16()
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e.First = first[:]
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e.Last = last[:]
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}
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return nil
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}
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func (e *IPListEntry) getACopy() IPListEntry {
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first := make([]byte, len(e.First))
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copy(first, e.First)
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last := make([]byte, len(e.Last))
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copy(last, e.Last)
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return IPListEntry{
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IPOrNet: e.IPOrNet,
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Description: e.Description,
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Type: e.Type,
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Mode: e.Mode,
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First: first,
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Last: last,
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IPType: e.IPType,
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Protocols: e.Protocols,
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CreatedAt: e.CreatedAt,
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UpdatedAt: e.UpdatedAt,
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DeletedAt: e.DeletedAt,
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}
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}
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// getAsRangerEntry returns the entry as cidranger.RangerEntry
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func (e *IPListEntry) getAsRangerEntry() (cidranger.RangerEntry, error) {
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_, network, err := net.ParseCIDR(e.IPOrNet)
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if err != nil {
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return nil, err
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}
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entry := e.getACopy()
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return &rangerEntry{
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entry: &entry,
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network: *network,
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}, nil
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}
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func (e IPListEntry) satisfySearchConstraints(filter, from, order string) bool {
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if filter != "" && !strings.HasPrefix(e.IPOrNet, filter) {
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return false
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}
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if from != "" {
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if order == OrderASC {
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return e.IPOrNet > from
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}
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return e.IPOrNet < from
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}
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return true
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}
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type rangerEntry struct {
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entry *IPListEntry
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network net.IPNet
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}
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func (e *rangerEntry) Network() net.IPNet {
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return e.network
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}
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// IPList defines an IP list
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type IPList struct {
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isInMemory atomic.Bool
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listType IPListType
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mu sync.RWMutex
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Ranges cidranger.Ranger
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}
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func (l *IPList) addEntry(e *IPListEntry) {
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if l.listType != e.Type {
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return
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}
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if !l.isInMemory.Load() {
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return
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}
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entry, err := e.getAsRangerEntry()
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if err != nil {
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providerLog(logger.LevelError, "unable to get entry to add %q for list type %d, disabling memory mode, err: %v",
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e.IPOrNet, l.listType, err)
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l.isInMemory.Store(false)
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return
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}
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l.mu.Lock()
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defer l.mu.Unlock()
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if err := l.Ranges.Insert(entry); err != nil {
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providerLog(logger.LevelError, "unable to add entry %q for list type %d, disabling memory mode, err: %v",
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e.IPOrNet, l.listType, err)
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l.isInMemory.Store(false)
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return
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}
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if l.Ranges.Len() >= ipListMemoryLimit {
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providerLog(logger.LevelError, "memory limit exceeded for list type %d, disabling memory mode", l.listType)
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l.isInMemory.Store(false)
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}
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}
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func (l *IPList) removeEntry(e *IPListEntry) {
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if l.listType != e.Type {
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return
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}
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if !l.isInMemory.Load() {
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return
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}
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entry, err := e.getAsRangerEntry()
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if err != nil {
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providerLog(logger.LevelError, "unable to get entry to remove %q for list type %d, disabling memory mode, err: %v",
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e.IPOrNet, l.listType, err)
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l.isInMemory.Store(false)
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return
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}
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l.mu.Lock()
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defer l.mu.Unlock()
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if _, err := l.Ranges.Remove(entry.Network()); err != nil {
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providerLog(logger.LevelError, "unable to remove entry %q for list type %d, disabling memory mode, err: %v",
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e.IPOrNet, l.listType, err)
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l.isInMemory.Store(false)
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}
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}
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func (l *IPList) updateEntry(e *IPListEntry) {
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if l.listType != e.Type {
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return
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}
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if !l.isInMemory.Load() {
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return
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}
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entry, err := e.getAsRangerEntry()
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if err != nil {
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providerLog(logger.LevelError, "unable to get entry to update %q for list type %d, disabling memory mode, err: %v",
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e.IPOrNet, l.listType, err)
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l.isInMemory.Store(false)
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return
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}
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l.mu.Lock()
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defer l.mu.Unlock()
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if _, err := l.Ranges.Remove(entry.Network()); err != nil {
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providerLog(logger.LevelError, "unable to remove entry to update %q for list type %d, disabling memory mode, err: %v",
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e.IPOrNet, l.listType, err)
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l.isInMemory.Store(false)
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return
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}
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if err := l.Ranges.Insert(entry); err != nil {
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providerLog(logger.LevelError, "unable to add entry to update %q for list type %d, disabling memory mode, err: %v",
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e.IPOrNet, l.listType, err)
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l.isInMemory.Store(false)
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}
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if l.Ranges.Len() >= ipListMemoryLimit {
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providerLog(logger.LevelError, "memory limit exceeded for list type %d, disabling memory mode", l.listType)
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l.isInMemory.Store(false)
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}
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}
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// DisableMemoryMode disables memory mode forcing database queries
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func (l *IPList) DisableMemoryMode() {
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l.isInMemory.Store(false)
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}
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// IsListed checks if there is a match for the specified IP and protocol.
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// If there are multiple matches, the first one is returned, in no particular order,
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// so the behavior is undefined
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func (l *IPList) IsListed(ip, protocol string) (bool, int, error) {
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if l.isInMemory.Load() {
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l.mu.RLock()
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defer l.mu.RUnlock()
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parsedIP := net.ParseIP(ip)
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if parsedIP == nil {
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return false, 0, fmt.Errorf("invalid IP %s", ip)
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}
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entries, err := l.Ranges.ContainingNetworks(parsedIP)
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if err != nil {
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return false, 0, fmt.Errorf("unable to find containing networks for ip %q: %w", ip, err)
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}
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for _, e := range entries {
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entry, ok := e.(*rangerEntry)
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if ok {
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if entry.entry.Protocols == 0 || entry.entry.HasProtocol(protocol) {
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return true, entry.entry.Mode, nil
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}
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}
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}
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return false, 0, nil
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}
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entries, err := provider.getListEntriesForIP(ip, l.listType)
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if err != nil {
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return false, 0, err
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}
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for _, e := range entries {
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if e.Protocols == 0 || e.HasProtocol(protocol) {
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return true, e.Mode, nil
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}
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}
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return false, 0, nil
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}
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// NewIPList returns a new IP list for the specified type
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func NewIPList(listType IPListType) (*IPList, error) {
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delete(inMemoryLists, listType)
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count, err := provider.countIPListEntries(listType)
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if err != nil {
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return nil, err
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}
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if count < ipListMemoryLimit {
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providerLog(logger.LevelInfo, "using in-memory matching for list type %d, num entries: %d", listType, count)
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entries, err := provider.getIPListEntries(listType, "", "", OrderASC, 0)
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if err != nil {
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return nil, err
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}
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ipList := &IPList{
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listType: listType,
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Ranges: cidranger.NewPCTrieRanger(),
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}
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for idx := range entries {
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e := entries[idx]
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entry, err := e.getAsRangerEntry()
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if err != nil {
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return nil, fmt.Errorf("unable to get ranger for entry %q: %w", e.IPOrNet, err)
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}
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if err := ipList.Ranges.Insert(entry); err != nil {
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return nil, fmt.Errorf("unable to add ranger for entry %q: %w", e.IPOrNet, err)
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}
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}
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ipList.isInMemory.Store(true)
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inMemoryLists[listType] = ipList
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return ipList, nil
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}
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providerLog(logger.LevelInfo, "list type %d has %d entries, in-memory matching disabled", listType, count)
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ipList := &IPList{
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listType: listType,
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Ranges: nil,
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}
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ipList.isInMemory.Store(false)
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return ipList, nil
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}
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