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Code Issues Projects Releases Wiki Activity

improve maintainability and license compliance

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0. Maximum parity with upstream code
1. Added Apache-required modification notices
2. Added Apache license
This commit is contained in:
Shivaram Lingamneni 2020-02-11 16:09:43 -05:00
parent c13597f807
commit 0c2d8adeac
7 changed files with 551 additions and 250 deletions
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2
irc/config.go
View File

@ -69,7 +69,7 @@ type AccountConfig struct {
Exempted []string
exemptedNets []net.IPNet
} `yaml:"require-sasl"`
LDAP ldap.LDAPConfig
LDAP ldap.ServerConfig
LoginThrottling struct {
Enabled bool
Duration time.Duration

202
irc/ldap/LICENSE Normal file
View File

@ -0,0 +1,202 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
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"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
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including but not limited to software source code, documentation
source, and configuration files.
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transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
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of this License, Derivative Works shall not include works that remain
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the Work and Derivative Works thereof.
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on behalf of whom a Contribution has been received by Licensor and
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of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
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7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
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Copyright 2015 Grafana Labs
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
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Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

51
irc/ldap/config.go
View File

@ -1,19 +1,21 @@
// Copyright (c) 2020 Matt Ouille
// Copyright (c) 2020 Shivaram Lingamneni
// released under the MIT license
// Copyright 2014-2018 Grafana Labs
// Released under the Apache 2.0 license
// Portions of this code copyright Grafana Labs and contributors
// and released under the Apache 2.0 license
// Modification notice:
// 1. All field names were changed from toml and snake case to yaml and kebab case,
// matching the Oragono project conventions
// 2. Two fields were added: `Autocreate` and `Timeout`
// XXX: none of AttributeMap does anything in oragono, except MemberOf,
// which can be used to retrieve group memberships
package ldap
import (
"fmt"
"strings"
"time"
)
type LDAPConfig struct {
type ServerConfig struct {
Enabled bool
Autocreate bool
@ -22,7 +24,7 @@ type LDAPConfig struct {
Timeout time.Duration
UseSSL bool `yaml:"use-ssl"`
StartTLS bool `yaml:"start-tls"`
SkipTLSVerify bool `yaml:"skip-tls-verify"`
SkipVerifySSL bool `yaml:"ssl-skip-verify"`
RootCACert string `yaml:"root-ca-cert"`
ClientCert string `yaml:"client-cert"`
ClientKey string `yaml:"client-key"`
@ -35,29 +37,22 @@ type LDAPConfig struct {
// user validation: require them to be in any one of these groups
RequireGroups []string `yaml:"require-groups"`
// two ways of testing group membership: either via an attribute
// of the user's DN, typically named 'memberOf', but customizable:
MemberOfAttribute string `yaml:"member-of-attribute"`
// or by searching for groups that match the user's DN
// two ways of testing group membership:
// either by searching for groups that match the user's DN
// and testing their names:
GroupSearchFilter string `yaml:"group-search-filter"`
GroupSearchFilterUserAttribute string `yaml:"group-search-filter-user-attribute"`
GroupSearchBaseDNs []string `yaml:"group-search-base-dns"`
// or by an attribute on the user's DN, typically named 'memberOf', but customizable:
Attr AttributeMap `yaml:"attributes"`
}
// shouldAdminBind checks if we should use
// admin username & password for LDAP bind
func (config *LDAPConfig) shouldAdminBind() bool {
return config.BindPassword != ""
}
// shouldSingleBind checks if we can use "single bind" approach
func (config *LDAPConfig) shouldSingleBind() bool {
return strings.Contains(config.BindDN, "%s")
}
// singleBindDN combines the bind with the username
// in order to get the proper path
func (config *LDAPConfig) singleBindDN(username string) string {
return fmt.Sprintf(config.BindDN, username)
// AttributeMap is a struct representation for LDAP "attributes" setting
type AttributeMap struct {
Username string
Name string
Surname string
Email string
MemberOf string `yaml:"member-of"`
}

266
irc/ldap/grafana.go Normal file
View File

@ -0,0 +1,266 @@
// Copyright 2014-2018 Grafana Labs
// Released under the Apache 2.0 license
// Modification notice: these functions were altered by substituting
// `serverConn` for `Server`.
package ldap
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"strings"
ldap "github.com/go-ldap/ldap/v3"
)
var (
// ErrInvalidCredentials is returned if username and password do not match
ErrInvalidCredentials = errors.New("Invalid Username or Password")
// ErrCouldNotFindUser is returned when username hasn't been found (not username+password)
ErrCouldNotFindUser = errors.New("Can't find user in LDAP")
)
// shouldAdminBind checks if we should use
// admin username & password for LDAP bind
func (server *serverConn) shouldAdminBind() bool {
return server.Config.BindPassword != ""
}
// singleBindDN combines the bind with the username
// in order to get the proper path
func (server *serverConn) singleBindDN(username string) string {
return fmt.Sprintf(server.Config.BindDN, username)
}
// shouldSingleBind checks if we can use "single bind" approach
func (server *serverConn) shouldSingleBind() bool {
return strings.Contains(server.Config.BindDN, "%s")
}
// Dial dials in the LDAP
// TODO: decrease cyclomatic complexity
func (server *serverConn) Dial() error {
var err error
var certPool *x509.CertPool
if server.Config.RootCACert != "" {
certPool = x509.NewCertPool()
for _, caCertFile := range strings.Split(server.Config.RootCACert, " ") {
pem, err := ioutil.ReadFile(caCertFile)
if err != nil {
return err
}
if !certPool.AppendCertsFromPEM(pem) {
return errors.New("Failed to append CA certificate " + caCertFile)
}
}
}
var clientCert tls.Certificate
if server.Config.ClientCert != "" && server.Config.ClientKey != "" {
clientCert, err = tls.LoadX509KeyPair(server.Config.ClientCert, server.Config.ClientKey)
if err != nil {
return err
}
}
for _, host := range strings.Split(server.Config.Host, " ") {
address := fmt.Sprintf("%s:%d", host, server.Config.Port)
if server.Config.UseSSL {
tlsCfg := &tls.Config{
InsecureSkipVerify: server.Config.SkipVerifySSL,
ServerName: host,
RootCAs: certPool,
}
if len(clientCert.Certificate) > 0 {
tlsCfg.Certificates = append(tlsCfg.Certificates, clientCert)
}
if server.Config.StartTLS {
server.Connection, err = ldap.Dial("tcp", address)
if err == nil {
if err = server.Connection.StartTLS(tlsCfg); err == nil {
return nil
}
}
} else {
server.Connection, err = ldap.DialTLS("tcp", address, tlsCfg)
}
} else {
server.Connection, err = ldap.Dial("tcp", address)
}
if err == nil {
return nil
}
}
return err
}
// Close closes the LDAP connection
// Dial() sets the connection with the server for this Struct. Therefore, we require a
// call to Dial() before being able to execute this function.
func (server *serverConn) Close() {
server.Connection.Close()
}
// userBind binds the user with the LDAP server
func (server *serverConn) userBind(path, password string) error {
err := server.Connection.Bind(path, password)
if err != nil {
if ldapErr, ok := err.(*ldap.Error); ok {
if ldapErr.ResultCode == 49 {
return ErrInvalidCredentials
}
}
return err
}
return nil
}
// users is helper method for the Users()
func (server *serverConn) users(logins []string) (
[]*ldap.Entry,
error,
) {
var result *ldap.SearchResult
var Config = server.Config
var err error
for _, base := range Config.SearchBaseDNs {
result, err = server.Connection.Search(
server.getSearchRequest(base, logins),
)
if err != nil {
return nil, err
}
if len(result.Entries) > 0 {
break
}
}
return result.Entries, nil
}
// getSearchRequest returns LDAP search request for users
func (server *serverConn) getSearchRequest(
base string,
logins []string,
) *ldap.SearchRequest {
attributes := []string{}
inputs := server.Config.Attr
attributes = appendIfNotEmpty(
attributes,
inputs.Username,
inputs.Surname,
inputs.Email,
inputs.Name,
inputs.MemberOf,
// In case for the POSIX LDAP schema server
server.Config.GroupSearchFilterUserAttribute,
)
search := ""
for _, login := range logins {
query := strings.Replace(
server.Config.SearchFilter,
"%s", ldap.EscapeFilter(login),
-1,
)
search = search + query
}
filter := fmt.Sprintf("(|%s)", search)
return &ldap.SearchRequest{
BaseDN: base,
Scope: ldap.ScopeWholeSubtree,
DerefAliases: ldap.NeverDerefAliases,
Attributes: attributes,
Filter: filter,
}
}
// requestMemberOf use this function when POSIX LDAP
// schema does not support memberOf, so it manually search the groups
func (server *serverConn) requestMemberOf(entry *ldap.Entry) ([]string, error) {
var memberOf []string
var config = server.Config
for _, groupSearchBase := range config.GroupSearchBaseDNs {
var filterReplace string
if config.GroupSearchFilterUserAttribute == "" {
filterReplace = getAttribute(config.Attr.Username, entry)
} else {
filterReplace = getAttribute(
config.GroupSearchFilterUserAttribute,
entry,
)
}
filter := strings.Replace(
config.GroupSearchFilter, "%s",
ldap.EscapeFilter(filterReplace),
-1,
)
server.log.Info("Searching for user's groups", "filter", filter)
// support old way of reading settings
groupIDAttribute := config.Attr.MemberOf
// but prefer dn attribute if default settings are used
if groupIDAttribute == "" || groupIDAttribute == "memberOf" {
groupIDAttribute = "dn"
}
groupSearchReq := ldap.SearchRequest{
BaseDN: groupSearchBase,
Scope: ldap.ScopeWholeSubtree,
DerefAliases: ldap.NeverDerefAliases,
Attributes: []string{groupIDAttribute},
Filter: filter,
}
groupSearchResult, err := server.Connection.Search(&groupSearchReq)
if err != nil {
return nil, err
}
if len(groupSearchResult.Entries) > 0 {
for _, group := range groupSearchResult.Entries {
memberOf = append(
memberOf,
getAttribute(groupIDAttribute, group),
)
}
break
}
}
return memberOf, nil
}
// getMemberOf finds memberOf property or request it
func (server *serverConn) getMemberOf(result *ldap.Entry) (
[]string, error,
) {
if server.Config.GroupSearchFilter == "" {
memberOf := getArrayAttribute(server.Config.Attr.MemberOf, result)
return memberOf, nil
}
memberOf, err := server.requestMemberOf(result)
if err != nil {
return nil, err
}
return memberOf, nil
}

13
irc/ldap/helpers.go
View File

@ -1,5 +1,5 @@
// Copyright Grafana Labs and contributors
// and released under the Apache 2.0 license
// Copyright 2014-2018 Grafana Labs
// Released under the Apache 2.0 license
package ldap
@ -49,3 +49,12 @@ func getAttribute(name string, entry *ldap.Entry) string {
}
return ""
}
func appendIfNotEmpty(slice []string, values ...string) []string {
for _, v := range values {
if v != "" {
slice = append(slice, v)
}
}
return slice
}

241
irc/ldap/login.go
View File

@ -30,12 +30,8 @@
package ldap
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"strings"
ldap "github.com/go-ldap/ldap/v3"
@ -43,38 +39,48 @@ import (
)
var (
ErrCouldNotFindUser = errors.New("No such user")
ErrUserNotInRequiredGroup = errors.New("User is not a member of any required groups")
ErrInvalidCredentials = errors.New("Invalid credentials")
)
func CheckLDAPPassphrase(config LDAPConfig, accountName, passphrase string, log *logger.Manager) (err error) {
// equivalent of Grafana's `Server`, but unexported
type serverConn struct {
Config *ServerConfig
Connection *ldap.Conn
log *logger.Manager
}
func CheckLDAPPassphrase(config ServerConfig, accountName, passphrase string, log *logger.Manager) (err error) {
defer func() {
if err != nil {
log.Debug("ldap", "failed passphrase check", err.Error())
}
}()
l, err := dial(&config)
server := serverConn{
Config: &config,
log: log,
}
err = server.Dial()
if err != nil {
return
}
defer l.Close()
defer server.Close()
l.SetTimeout(config.Timeout)
server.Connection.SetTimeout(config.Timeout)
passphraseChecked := false
if config.shouldSingleBind() {
if server.shouldSingleBind() {
log.Debug("ldap", "attempting single bind to", accountName)
err = l.Bind(config.singleBindDN(accountName), passphrase)
err = server.userBind(server.singleBindDN(accountName), passphrase)
passphraseChecked = (err == nil)
} else if config.shouldAdminBind() {
} else if server.shouldAdminBind() {
log.Debug("ldap", "attempting admin bind to", config.BindDN)
err = l.Bind(config.BindDN, config.BindPassword)
err = server.userBind(config.BindDN, config.BindPassword)
} else {
log.Debug("ldap", "attempting unauthenticated bind")
err = l.UnauthenticatedBind(config.BindDN)
err = server.Connection.UnauthenticatedBind(config.BindDN)
}
if err != nil {
@ -85,7 +91,7 @@ func CheckLDAPPassphrase(config LDAPConfig, accountName, passphrase string, log
return nil
}
users, err := lookupUsers(l, &config, accountName)
users, err := server.users([]string{accountName})
if err != nil {
log.Debug("ldap", "failed user lookup")
return err
@ -99,94 +105,34 @@ func CheckLDAPPassphrase(config LDAPConfig, accountName, passphrase string, log
log.Debug("ldap", "looked up user", user.DN)
err = validateGroupMembership(l, &config, user, log)
err = server.validateGroupMembership(user)
if err != nil {
return err
}
if !passphraseChecked {
// Authenticate user
log.Debug("ldap", "rebinding", user.DN)
err = l.Bind(user.DN, passphrase)
if err != nil {
log.Debug("ldap", "failed rebind", err.Error())
if ldapErr, ok := err.(*ldap.Error); ok {
if ldapErr.ResultCode == 49 {
return ErrInvalidCredentials
}
}
err = server.userBind(user.DN, passphrase)
}
return err
}
return nil
}
func dial(config *LDAPConfig) (conn *ldap.Conn, err error) {
var certPool *x509.CertPool
if config.RootCACert != "" {
certPool = x509.NewCertPool()
for _, caCertFile := range strings.Split(config.RootCACert, " ") {
pem, err := ioutil.ReadFile(caCertFile)
if err != nil {
return nil, err
}
if !certPool.AppendCertsFromPEM(pem) {
return nil, errors.New("Failed to append CA certificate " + caCertFile)
}
}
}
var clientCert tls.Certificate
if config.ClientCert != "" && config.ClientKey != "" {
clientCert, err = tls.LoadX509KeyPair(config.ClientCert, config.ClientKey)
if err != nil {
func (server *serverConn) validateGroupMembership(user *ldap.Entry) (err error) {
if len(server.Config.RequireGroups) == 0 {
return
}
}
for _, host := range strings.Split(config.Host, " ") {
address := fmt.Sprintf("%s:%d", host, config.Port)
if config.UseSSL {
tlsCfg := &tls.Config{
InsecureSkipVerify: config.SkipTLSVerify,
ServerName: host,
RootCAs: certPool,
}
if len(clientCert.Certificate) > 0 {
tlsCfg.Certificates = append(tlsCfg.Certificates, clientCert)
}
if config.StartTLS {
conn, err = ldap.Dial("tcp", address)
if err == nil {
if err = conn.StartTLS(tlsCfg); err == nil {
return
}
}
} else {
conn, err = ldap.DialTLS("tcp", address, tlsCfg)
}
} else {
conn, err = ldap.Dial("tcp", address)
}
if err == nil {
return
}
}
return
}
func validateGroupMembership(conn *ldap.Conn, config *LDAPConfig, user *ldap.Entry, log *logger.Manager) (err error) {
if len(config.RequireGroups) != 0 {
var memberOf []string
memberOf, err = getMemberOf(conn, config, user)
memberOf, err = server.getMemberOf(user)
if err != nil {
log.Debug("ldap", "could not retrieve group memberships", err.Error())
server.log.Debug("ldap", "could not retrieve group memberships", err.Error())
return
}
log.Debug("ldap", fmt.Sprintf("found group memberships: %v", memberOf))
server.log.Debug("ldap", fmt.Sprintf("found group memberships: %v", memberOf))
foundGroup := false
for _, inGroup := range memberOf {
for _, acceptableGroup := range config.RequireGroups {
for _, acceptableGroup := range server.Config.RequireGroups {
if inGroup == acceptableGroup {
foundGroup = true
break
@ -196,128 +142,9 @@ func validateGroupMembership(conn *ldap.Conn, config *LDAPConfig, user *ldap.Ent
break
}
}
if !foundGroup {
if foundGroup {
return nil
} else {
return ErrUserNotInRequiredGroup
}
}
return nil
}
func lookupUsers(conn *ldap.Conn, config *LDAPConfig, accountName string) (results []*ldap.Entry, err error) {
var result *ldap.SearchResult
for _, base := range config.SearchBaseDNs {
result, err = conn.Search(
getSearchRequest(config, base, accountName),
)
if err != nil {
return nil, err
} else if len(result.Entries) > 0 {
return result.Entries, nil
}
}
return nil, nil
}
// getSearchRequest returns LDAP search request for users
func getSearchRequest(
config *LDAPConfig,
base string,
accountName string,
) *ldap.SearchRequest {
var attributes []string
if config.MemberOfAttribute != "" {
attributes = []string{config.MemberOfAttribute}
}
query := strings.Replace(
config.SearchFilter,
"%s", ldap.EscapeFilter(accountName),
-1,
)
return &ldap.SearchRequest{
BaseDN: base,
Scope: ldap.ScopeWholeSubtree,
DerefAliases: ldap.NeverDerefAliases,
Attributes: attributes,
Filter: query,
}
}
// getMemberOf finds memberOf property or request it
func getMemberOf(conn *ldap.Conn, config *LDAPConfig, result *ldap.Entry) (
[]string, error,
) {
if config.GroupSearchFilter == "" {
memberOf := getArrayAttribute(config.MemberOfAttribute, result)
return memberOf, nil
}
memberOf, err := requestMemberOf(conn, config, result)
if err != nil {
return nil, err
}
return memberOf, nil
}
// requestMemberOf use this function when POSIX LDAP
// schema does not support memberOf, so it manually search the groups
func requestMemberOf(conn *ldap.Conn, config *LDAPConfig, entry *ldap.Entry) ([]string, error) {
var memberOf []string
for _, groupSearchBase := range config.GroupSearchBaseDNs {
var filterReplace string
if config.GroupSearchFilterUserAttribute == "" {
filterReplace = "cn"
} else {
filterReplace = getAttribute(
config.GroupSearchFilterUserAttribute,
entry,
)
}
filter := strings.Replace(
config.GroupSearchFilter, "%s",
ldap.EscapeFilter(filterReplace),
-1,
)
// support old way of reading settings
groupIDAttribute := config.MemberOfAttribute
// but prefer dn attribute if default settings are used
if groupIDAttribute == "" || groupIDAttribute == "memberOf" {
groupIDAttribute = "dn"
}
groupSearchReq := ldap.SearchRequest{
BaseDN: groupSearchBase,
Scope: ldap.ScopeWholeSubtree,
DerefAliases: ldap.NeverDerefAliases,
Attributes: []string{groupIDAttribute},
Filter: filter,
}
groupSearchResult, err := conn.Search(&groupSearchReq)
if err != nil {
return nil, err
}
if len(groupSearchResult.Entries) > 0 {
for _, group := range groupSearchResult.Entries {
memberOf = append(
memberOf,
getAttribute(groupIDAttribute, group),
)
}
break
}
}
return memberOf, nil
}

4
oragono.yaml
View File

@ -387,6 +387,7 @@ accounts:
# support for deferring password checking to an external LDAP server
# you should probably ignore this section! consult the grafana docs for details:
# https://grafana.com/docs/grafana/latest/auth/ldap/
# you will probably want to set require-sasl and disable accounts.registration.enabled
# ldap:
# enabled: true
# # should we automatically create users if their LDAP login succeeds?
@ -412,7 +413,8 @@ accounts:
# # - "dc=example,dc=com"
# # example of group membership testing via user attributes, as in AD
# # or with OpenLDAP's "memberOf overlay" (overrides group-search-filter):
# #member-of-attribute: "memberOf"
# attributes:
# member-of: "memberOf"
# channel options
channels: