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Add an option to allow plaintext connection to LDAP/AD Server (#9151)

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This commit is contained in:
Nitish Tiwari 2020-03-20 07:50:51 +05:30 committed by GitHub
parent c5b87f93dd
commit ecf1566266
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3 changed files with 27 additions and 4 deletions
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17
cmd/config/identity/ldap/config.go
View File

@ -52,6 +52,7 @@ type Config struct {
stsExpiryDuration time.Duration // contains converted value
tlsSkipVerify bool // allows skipping TLS verification
serverInsecure bool // allows plain text connection to LDAP Server
rootCAs *x509.CertPool
}
@ -64,10 +65,12 @@ const (
GroupNameAttribute = "group_name_attribute"
GroupSearchBaseDN = "group_search_base_dn"
TLSSkipVerify = "tls_skip_verify"
ServerInsecure = "server_insecure"
EnvServerAddr = "MINIO_IDENTITY_LDAP_SERVER_ADDR"
EnvSTSExpiry = "MINIO_IDENTITY_LDAP_STS_EXPIRY"
EnvTLSSkipVerify = "MINIO_IDENTITY_LDAP_TLS_SKIP_VERIFY"
EnvServerInsecure = "MINIO_IDENTITY_LDAP_SERVER_INSECURE"
EnvUsernameFormat = "MINIO_IDENTITY_LDAP_USERNAME_FORMAT"
EnvGroupSearchFilter = "MINIO_IDENTITY_LDAP_GROUP_SEARCH_FILTER"
EnvGroupNameAttribute = "MINIO_IDENTITY_LDAP_GROUP_NAME_ATTRIBUTE"
@ -105,6 +108,10 @@ var (
Key: TLSSkipVerify,
Value: config.EnableOff,
},
config.KV{
Key: ServerInsecure,
Value: config.EnableOff,
},
}
)
@ -114,6 +121,10 @@ func (l *Config) Connect() (ldapConn *ldap.Conn, err error) {
// Happens when LDAP is not configured.
return
}
if l.serverInsecure {
return ldap.Dial("tcp", l.ServerAddr)
}
return ldap.DialTLS("tcp", l.ServerAddr, &tls.Config{
InsecureSkipVerify: l.tlsSkipVerify,
RootCAs: l.rootCAs,
@ -154,6 +165,12 @@ func Lookup(kvs config.KVS, rootCAs *x509.CertPool) (l Config, err error) {
l.STSExpiryDuration = v
l.stsExpiryDuration = expDur
}
if v := env.Get(EnvServerInsecure, kvs.Get(ServerInsecure)); v != "" {
l.serverInsecure, err = config.ParseBool(v)
if err != nil {
return l, err
}
}
if v := env.Get(EnvTLSSkipVerify, kvs.Get(TLSSkipVerify)); v != "" {
l.tlsSkipVerify, err = config.ParseBool(v)
if err != nil {

8
cmd/config/identity/ldap/help.go
View File

@ -57,7 +57,13 @@ var (
},
config.HelpKV{
Key: TLSSkipVerify,
Description: `trust server TLS without verification, defaults to "on" (verify)`,
Description: `trust server TLS without verification, defaults to "off" (verify)`,
Optional: true,
Type: "on|off",
},
config.HelpKV{
Key: ServerInsecure,
Description: `allow plain text connection to AD/LDAP server, defaults to "off" (TLS)`,
Optional: true,
Type: "on|off",
},

6
docs/sts/ldap.md
View File

@ -49,11 +49,11 @@ LDAP is configured via the following environment variables:
| **MINIO_IDENTITY_LDAP_GROUP_NAME_ATTRIBUTE** | **NO** | Attribute of search results to use as group name |
| **MINIO_IDENTITY_LDAP_STS_EXPIRY** | **NO** (default: "1h") | STS credentials validity duration |
| **MINIO_IDENTITY_LDAP_TLS_SKIP_VERIFY** | **NO** (default: "off") | Set this to 'on', to disable client verification of server certificates |
| **MINIO_IDENTITY_LDAP_SERVER_INSECURE** | **NO** (default: "off") | Set this to 'on', to allow plain text connection to LDAP/AD Server (only for testing) |
MinIO sends LDAP credentials to LDAP server for validation. So we _strongly recommend_ to use MinIO with AD/LDAP server over TLS _only_. Using plain-text connection between MinIO and LDAP server means _credentials can be compromised_ by anyone listening to network traffic.
Please note that MinIO will only access the AD/LDAP server over TLS. If a self-signed certificate is being used, the certificate can be added to MinIO's certificates directory, so it can be trusted by the server.
An example setup for development or experimentation:
If a self-signed certificate is being used, the certificate can be added to MinIO's certificates directory, so it can be trusted by the server. An example setup for development or experimentation:
``` shell
export MINIO_IDENTITY_LDAP_SERVER_ADDR=myldapserver.com:636