729 lines
22 KiB
Go
729 lines
22 KiB
Go
|
// Package config implements KRB5 client and service configuration as described at https://web.mit.edu/kerberos/krb5-latest/doc/admin/conf_files/krb5_conf.html
|
||
|
|
package config
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"encoding/hex"
|
||
|
|
"encoding/json"
|
||
|
|
"errors"
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
"net"
|
||
|
|
"os"
|
||
|
|
"os/user"
|
||
|
|
"regexp"
|
||
|
|
"strconv"
|
||
|
|
"strings"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"github.com/jcmturner/gofork/encoding/asn1"
|
||
|
|
"github.com/jcmturner/gokrb5/v8/iana/etypeID"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Config represents the KRB5 configuration.
|
||
|
|
type Config struct {
|
||
|
|
LibDefaults LibDefaults
|
||
|
|
Realms []Realm
|
||
|
|
DomainRealm DomainRealm
|
||
|
|
//CaPaths
|
||
|
|
//AppDefaults
|
||
|
|
//Plugins
|
||
|
|
}
|
||
|
|
|
||
|
|
// WeakETypeList is a list of encryption types that have been deemed weak.
|
||
|
|
const WeakETypeList = "des-cbc-crc des-cbc-md4 des-cbc-md5 des-cbc-raw des3-cbc-raw des-hmac-sha1 arcfour-hmac-exp rc4-hmac-exp arcfour-hmac-md5-exp des"
|
||
|
|
|
||
|
|
// New creates a new config struct instance.
|
||
|
|
func New() *Config {
|
||
|
|
d := make(DomainRealm)
|
||
|
|
return &Config{
|
||
|
|
LibDefaults: newLibDefaults(),
|
||
|
|
DomainRealm: d,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// LibDefaults represents the [libdefaults] section of the configuration.
|
||
|
|
type LibDefaults struct {
|
||
|
|
AllowWeakCrypto bool //default false
|
||
|
|
// ap_req_checksum_type int //unlikely to support this
|
||
|
|
Canonicalize bool //default false
|
||
|
|
CCacheType int //default is 4. unlikely to implement older
|
||
|
|
Clockskew time.Duration //max allowed skew in seconds, default 300
|
||
|
|
//Default_ccache_name string // default /tmp/krb5cc_%{uid} //Not implementing as will hold in memory
|
||
|
|
DefaultClientKeytabName string //default /usr/local/var/krb5/user/%{euid}/client.keytab
|
||
|
|
DefaultKeytabName string //default /etc/krb5.keytab
|
||
|
|
DefaultRealm string
|
||
|
|
DefaultTGSEnctypes []string //default aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96 des3-cbc-sha1 arcfour-hmac-md5 camellia256-cts-cmac camellia128-cts-cmac des-cbc-crc des-cbc-md5 des-cbc-md4
|
||
|
|
DefaultTktEnctypes []string //default aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96 des3-cbc-sha1 arcfour-hmac-md5 camellia256-cts-cmac camellia128-cts-cmac des-cbc-crc des-cbc-md5 des-cbc-md4
|
||
|
|
DefaultTGSEnctypeIDs []int32 //default aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96 des3-cbc-sha1 arcfour-hmac-md5 camellia256-cts-cmac camellia128-cts-cmac des-cbc-crc des-cbc-md5 des-cbc-md4
|
||
|
|
DefaultTktEnctypeIDs []int32 //default aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96 des3-cbc-sha1 arcfour-hmac-md5 camellia256-cts-cmac camellia128-cts-cmac des-cbc-crc des-cbc-md5 des-cbc-md4
|
||
|
|
DNSCanonicalizeHostname bool //default true
|
||
|
|
DNSLookupKDC bool //default false
|
||
|
|
DNSLookupRealm bool
|
||
|
|
ExtraAddresses []net.IP //Not implementing yet
|
||
|
|
Forwardable bool //default false
|
||
|
|
IgnoreAcceptorHostname bool //default false
|
||
|
|
K5LoginAuthoritative bool //default false
|
||
|
|
K5LoginDirectory string //default user's home directory. Must be owned by the user or root
|
||
|
|
KDCDefaultOptions asn1.BitString //default 0x00000010 (KDC_OPT_RENEWABLE_OK)
|
||
|
|
KDCTimeSync int //default 1
|
||
|
|
//kdc_req_checksum_type int //unlikely to implement as for very old KDCs
|
||
|
|
NoAddresses bool //default true
|
||
|
|
PermittedEnctypes []string //default aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96 des3-cbc-sha1 arcfour-hmac-md5 camellia256-cts-cmac camellia128-cts-cmac des-cbc-crc des-cbc-md5 des-cbc-md4
|
||
|
|
PermittedEnctypeIDs []int32
|
||
|
|
//plugin_base_dir string //not supporting plugins
|
||
|
|
PreferredPreauthTypes []int //default “17, 16, 15, 14”, which forces libkrb5 to attempt to use PKINIT if it is supported
|
||
|
|
Proxiable bool //default false
|
||
|
|
RDNS bool //default true
|
||
|
|
RealmTryDomains int //default -1
|
||
|
|
RenewLifetime time.Duration //default 0
|
||
|
|
SafeChecksumType int //default 8
|
||
|
|
TicketLifetime time.Duration //default 1 day
|
||
|
|
UDPPreferenceLimit int // 1 means to always use tcp. MIT krb5 has a default value of 1465, and it prevents user setting more than 32700.
|
||
|
|
VerifyAPReqNofail bool //default false
|
||
|
|
}
|
||
|
|
|
||
|
|
// Create a new LibDefaults struct.
|
||
|
|
func newLibDefaults() LibDefaults {
|
||
|
|
uid := "0"
|
||
|
|
var hdir string
|
||
|
|
usr, _ := user.Current()
|
||
|
|
if usr != nil {
|
||
|
|
uid = usr.Uid
|
||
|
|
hdir = usr.HomeDir
|
||
|
|
}
|
||
|
|
opts := asn1.BitString{}
|
||
|
|
opts.Bytes, _ = hex.DecodeString("00000010")
|
||
|
|
opts.BitLength = len(opts.Bytes) * 8
|
||
|
|
return LibDefaults{
|
||
|
|
CCacheType: 4,
|
||
|
|
Clockskew: time.Duration(300) * time.Second,
|
||
|
|
DefaultClientKeytabName: fmt.Sprintf("/usr/local/var/krb5/user/%s/client.keytab", uid),
|
||
|
|
DefaultKeytabName: "/etc/krb5.keytab",
|
||
|
|
DefaultTGSEnctypes: []string{"aes256-cts-hmac-sha1-96", "aes128-cts-hmac-sha1-96", "des3-cbc-sha1", "arcfour-hmac-md5", "camellia256-cts-cmac", "camellia128-cts-cmac", "des-cbc-crc", "des-cbc-md5", "des-cbc-md4"},
|
||
|
|
DefaultTktEnctypes: []string{"aes256-cts-hmac-sha1-96", "aes128-cts-hmac-sha1-96", "des3-cbc-sha1", "arcfour-hmac-md5", "camellia256-cts-cmac", "camellia128-cts-cmac", "des-cbc-crc", "des-cbc-md5", "des-cbc-md4"},
|
||
|
|
DNSCanonicalizeHostname: true,
|
||
|
|
K5LoginDirectory: hdir,
|
||
|
|
KDCDefaultOptions: opts,
|
||
|
|
KDCTimeSync: 1,
|
||
|
|
NoAddresses: true,
|
||
|
|
PermittedEnctypes: []string{"aes256-cts-hmac-sha1-96", "aes128-cts-hmac-sha1-96", "des3-cbc-sha1", "arcfour-hmac-md5", "camellia256-cts-cmac", "camellia128-cts-cmac", "des-cbc-crc", "des-cbc-md5", "des-cbc-md4"},
|
||
|
|
RDNS: true,
|
||
|
|
RealmTryDomains: -1,
|
||
|
|
SafeChecksumType: 8,
|
||
|
|
TicketLifetime: time.Duration(24) * time.Hour,
|
||
|
|
UDPPreferenceLimit: 1465,
|
||
|
|
PreferredPreauthTypes: []int{17, 16, 15, 14},
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse the lines of the [libdefaults] section of the configuration into the LibDefaults struct.
|
||
|
|
func (l *LibDefaults) parseLines(lines []string) error {
|
||
|
|
for _, line := range lines {
|
||
|
|
//Remove comments after the values
|
||
|
|
if idx := strings.IndexAny(line, "#;"); idx != -1 {
|
||
|
|
line = line[:idx]
|
||
|
|
}
|
||
|
|
line = strings.TrimSpace(line)
|
||
|
|
if line == "" {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if !strings.Contains(line, "=") {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s)", line)
|
||
|
|
}
|
||
|
|
|
||
|
|
p := strings.Split(line, "=")
|
||
|
|
key := strings.TrimSpace(strings.ToLower(p[0]))
|
||
|
|
switch key {
|
||
|
|
case "allow_weak_crypto":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.AllowWeakCrypto = v
|
||
|
|
case "canonicalize":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.Canonicalize = v
|
||
|
|
case "ccache_type":
|
||
|
|
p[1] = strings.TrimSpace(p[1])
|
||
|
|
v, err := strconv.ParseUint(p[1], 10, 32)
|
||
|
|
if err != nil || v < 0 || v > 4 {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s)", line)
|
||
|
|
}
|
||
|
|
l.CCacheType = int(v)
|
||
|
|
case "clockskew":
|
||
|
|
d, err := parseDuration(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.Clockskew = d
|
||
|
|
case "default_client_keytab_name":
|
||
|
|
l.DefaultClientKeytabName = strings.TrimSpace(p[1])
|
||
|
|
case "default_keytab_name":
|
||
|
|
l.DefaultKeytabName = strings.TrimSpace(p[1])
|
||
|
|
case "default_realm":
|
||
|
|
l.DefaultRealm = strings.TrimSpace(p[1])
|
||
|
|
case "default_tgs_enctypes":
|
||
|
|
l.DefaultTGSEnctypes = strings.Fields(p[1])
|
||
|
|
case "default_tkt_enctypes":
|
||
|
|
l.DefaultTktEnctypes = strings.Fields(p[1])
|
||
|
|
case "dns_canonicalize_hostname":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.DNSCanonicalizeHostname = v
|
||
|
|
case "dns_lookup_kdc":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.DNSLookupKDC = v
|
||
|
|
case "dns_lookup_realm":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.DNSLookupRealm = v
|
||
|
|
case "extra_addresses":
|
||
|
|
ipStr := strings.TrimSpace(p[1])
|
||
|
|
for _, ip := range strings.Split(ipStr, ",") {
|
||
|
|
if eip := net.ParseIP(ip); eip != nil {
|
||
|
|
l.ExtraAddresses = append(l.ExtraAddresses, eip)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
case "forwardable":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.Forwardable = v
|
||
|
|
case "ignore_acceptor_hostname":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.IgnoreAcceptorHostname = v
|
||
|
|
case "k5login_authoritative":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.K5LoginAuthoritative = v
|
||
|
|
case "k5login_directory":
|
||
|
|
l.K5LoginDirectory = strings.TrimSpace(p[1])
|
||
|
|
case "kdc_default_options":
|
||
|
|
v := strings.TrimSpace(p[1])
|
||
|
|
v = strings.Replace(v, "0x", "", -1)
|
||
|
|
b, err := hex.DecodeString(v)
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.KDCDefaultOptions.Bytes = b
|
||
|
|
l.KDCDefaultOptions.BitLength = len(b) * 8
|
||
|
|
case "kdc_timesync":
|
||
|
|
p[1] = strings.TrimSpace(p[1])
|
||
|
|
v, err := strconv.ParseInt(p[1], 10, 32)
|
||
|
|
if err != nil || v < 0 {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s)", line)
|
||
|
|
}
|
||
|
|
l.KDCTimeSync = int(v)
|
||
|
|
case "noaddresses":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.NoAddresses = v
|
||
|
|
case "permitted_enctypes":
|
||
|
|
l.PermittedEnctypes = strings.Fields(p[1])
|
||
|
|
case "preferred_preauth_types":
|
||
|
|
p[1] = strings.TrimSpace(p[1])
|
||
|
|
t := strings.Split(p[1], ",")
|
||
|
|
var v []int
|
||
|
|
for _, s := range t {
|
||
|
|
i, err := strconv.ParseInt(s, 10, 32)
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
v = append(v, int(i))
|
||
|
|
}
|
||
|
|
l.PreferredPreauthTypes = v
|
||
|
|
case "proxiable":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.Proxiable = v
|
||
|
|
case "rdns":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.RDNS = v
|
||
|
|
case "realm_try_domains":
|
||
|
|
p[1] = strings.TrimSpace(p[1])
|
||
|
|
v, err := strconv.ParseInt(p[1], 10, 32)
|
||
|
|
if err != nil || v < -1 {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s)", line)
|
||
|
|
}
|
||
|
|
l.RealmTryDomains = int(v)
|
||
|
|
case "renew_lifetime":
|
||
|
|
d, err := parseDuration(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.RenewLifetime = d
|
||
|
|
case "safe_checksum_type":
|
||
|
|
p[1] = strings.TrimSpace(p[1])
|
||
|
|
v, err := strconv.ParseInt(p[1], 10, 32)
|
||
|
|
if err != nil || v < 0 {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s)", line)
|
||
|
|
}
|
||
|
|
l.SafeChecksumType = int(v)
|
||
|
|
case "ticket_lifetime":
|
||
|
|
d, err := parseDuration(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.TicketLifetime = d
|
||
|
|
case "udp_preference_limit":
|
||
|
|
p[1] = strings.TrimSpace(p[1])
|
||
|
|
v, err := strconv.ParseUint(p[1], 10, 32)
|
||
|
|
if err != nil || v > 32700 {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s)", line)
|
||
|
|
}
|
||
|
|
l.UDPPreferenceLimit = int(v)
|
||
|
|
case "verify_ap_req_nofail":
|
||
|
|
v, err := parseBoolean(p[1])
|
||
|
|
if err != nil {
|
||
|
|
return InvalidErrorf("libdefaults section line (%s): %v", line, err)
|
||
|
|
}
|
||
|
|
l.VerifyAPReqNofail = v
|
||
|
|
}
|
||
|
|
}
|
||
|
|
l.DefaultTGSEnctypeIDs = parseETypes(l.DefaultTGSEnctypes, l.AllowWeakCrypto)
|
||
|
|
l.DefaultTktEnctypeIDs = parseETypes(l.DefaultTktEnctypes, l.AllowWeakCrypto)
|
||
|
|
l.PermittedEnctypeIDs = parseETypes(l.PermittedEnctypes, l.AllowWeakCrypto)
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Realm represents an entry in the [realms] section of the configuration.
|
||
|
|
type Realm struct {
|
||
|
|
Realm string
|
||
|
|
AdminServer []string
|
||
|
|
//auth_to_local //Not implementing for now
|
||
|
|
//auth_to_local_names //Not implementing for now
|
||
|
|
DefaultDomain string
|
||
|
|
KDC []string
|
||
|
|
KPasswdServer []string //default admin_server:464
|
||
|
|
MasterKDC []string
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse the lines of a [realms] entry into the Realm struct.
|
||
|
|
func (r *Realm) parseLines(name string, lines []string) (err error) {
|
||
|
|
r.Realm = name
|
||
|
|
var adminServerFinal bool
|
||
|
|
var KDCFinal bool
|
||
|
|
var kpasswdServerFinal bool
|
||
|
|
var masterKDCFinal bool
|
||
|
|
var ignore bool
|
||
|
|
var c int // counts the depth of blocks within brackets { }
|
||
|
|
for _, line := range lines {
|
||
|
|
if ignore && c > 0 && !strings.Contains(line, "{") && !strings.Contains(line, "}") {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
//Remove comments after the values
|
||
|
|
if idx := strings.IndexAny(line, "#;"); idx != -1 {
|
||
|
|
line = line[:idx]
|
||
|
|
}
|
||
|
|
line = strings.TrimSpace(line)
|
||
|
|
if line == "" {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if !strings.Contains(line, "=") && !strings.Contains(line, "}") {
|
||
|
|
return InvalidErrorf("realms section line (%s)", line)
|
||
|
|
}
|
||
|
|
if strings.Contains(line, "v4_") {
|
||
|
|
ignore = true
|
||
|
|
err = UnsupportedDirective{"v4 configurations are not supported"}
|
||
|
|
}
|
||
|
|
if strings.Contains(line, "{") {
|
||
|
|
c++
|
||
|
|
if ignore {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if strings.Contains(line, "}") {
|
||
|
|
c--
|
||
|
|
if c < 0 {
|
||
|
|
return InvalidErrorf("unpaired curly brackets")
|
||
|
|
}
|
||
|
|
if ignore {
|
||
|
|
if c < 1 {
|
||
|
|
c = 0
|
||
|
|
ignore = false
|
||
|
|
}
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
p := strings.Split(line, "=")
|
||
|
|
key := strings.TrimSpace(strings.ToLower(p[0]))
|
||
|
|
v := strings.TrimSpace(p[1])
|
||
|
|
switch key {
|
||
|
|
case "admin_server":
|
||
|
|
appendUntilFinal(&r.AdminServer, v, &adminServerFinal)
|
||
|
|
case "default_domain":
|
||
|
|
r.DefaultDomain = v
|
||
|
|
case "kdc":
|
||
|
|
if !strings.Contains(v, ":") {
|
||
|
|
// No port number specified default to 88
|
||
|
|
if strings.HasSuffix(v, `*`) {
|
||
|
|
v = strings.TrimSpace(strings.TrimSuffix(v, `*`)) + ":88*"
|
||
|
|
} else {
|
||
|
|
v = strings.TrimSpace(v) + ":88"
|
||
|
|
}
|
||
|
|
}
|
||
|
|
appendUntilFinal(&r.KDC, v, &KDCFinal)
|
||
|
|
case "kpasswd_server":
|
||
|
|
appendUntilFinal(&r.KPasswdServer, v, &kpasswdServerFinal)
|
||
|
|
case "master_kdc":
|
||
|
|
appendUntilFinal(&r.MasterKDC, v, &masterKDCFinal)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
//default for Kpasswd_server = admin_server:464
|
||
|
|
if len(r.KPasswdServer) < 1 {
|
||
|
|
for _, a := range r.AdminServer {
|
||
|
|
s := strings.Split(a, ":")
|
||
|
|
r.KPasswdServer = append(r.KPasswdServer, s[0]+":464")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse the lines of the [realms] section of the configuration into an slice of Realm structs.
|
||
|
|
func parseRealms(lines []string) (realms []Realm, err error) {
|
||
|
|
var name string
|
||
|
|
var start int
|
||
|
|
var c int
|
||
|
|
for i, l := range lines {
|
||
|
|
//Remove comments after the values
|
||
|
|
if idx := strings.IndexAny(l, "#;"); idx != -1 {
|
||
|
|
l = l[:idx]
|
||
|
|
}
|
||
|
|
l = strings.TrimSpace(l)
|
||
|
|
if l == "" {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
//if strings.Contains(l, "v4_") {
|
||
|
|
// return nil, errors.New("v4 configurations are not supported in Realms section")
|
||
|
|
//}
|
||
|
|
if strings.Contains(l, "{") {
|
||
|
|
c++
|
||
|
|
if !strings.Contains(l, "=") {
|
||
|
|
return nil, fmt.Errorf("realm configuration line invalid: %s", l)
|
||
|
|
}
|
||
|
|
if c == 1 {
|
||
|
|
start = i
|
||
|
|
p := strings.Split(l, "=")
|
||
|
|
name = strings.TrimSpace(p[0])
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if strings.Contains(l, "}") {
|
||
|
|
if c < 1 {
|
||
|
|
// but not started a block!!!
|
||
|
|
return nil, errors.New("invalid Realms section in configuration")
|
||
|
|
}
|
||
|
|
c--
|
||
|
|
if c == 0 {
|
||
|
|
var r Realm
|
||
|
|
e := r.parseLines(name, lines[start+1:i])
|
||
|
|
if e != nil {
|
||
|
|
if _, ok := e.(UnsupportedDirective); !ok {
|
||
|
|
err = e
|
||
|
|
return
|
||
|
|
}
|
||
|
|
err = e
|
||
|
|
}
|
||
|
|
realms = append(realms, r)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// DomainRealm maps the domains to realms representing the [domain_realm] section of the configuration.
|
||
|
|
type DomainRealm map[string]string
|
||
|
|
|
||
|
|
// Parse the lines of the [domain_realm] section of the configuration and add to the mapping.
|
||
|
|
func (d *DomainRealm) parseLines(lines []string) error {
|
||
|
|
for _, line := range lines {
|
||
|
|
//Remove comments after the values
|
||
|
|
if idx := strings.IndexAny(line, "#;"); idx != -1 {
|
||
|
|
line = line[:idx]
|
||
|
|
}
|
||
|
|
if strings.TrimSpace(line) == "" {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if !strings.Contains(line, "=") {
|
||
|
|
return InvalidErrorf("realm line (%s)", line)
|
||
|
|
}
|
||
|
|
p := strings.Split(line, "=")
|
||
|
|
domain := strings.TrimSpace(strings.ToLower(p[0]))
|
||
|
|
realm := strings.TrimSpace(p[1])
|
||
|
|
d.addMapping(domain, realm)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Add a domain to realm mapping.
|
||
|
|
func (d *DomainRealm) addMapping(domain, realm string) {
|
||
|
|
(*d)[domain] = realm
|
||
|
|
}
|
||
|
|
|
||
|
|
// Delete a domain to realm mapping.
|
||
|
|
func (d *DomainRealm) deleteMapping(domain, realm string) {
|
||
|
|
delete(*d, domain)
|
||
|
|
}
|
||
|
|
|
||
|
|
// ResolveRealm resolves the kerberos realm for the specified domain name from the domain to realm mapping.
|
||
|
|
// The most specific mapping is returned.
|
||
|
|
func (c *Config) ResolveRealm(domainName string) string {
|
||
|
|
domainName = strings.TrimSuffix(domainName, ".")
|
||
|
|
|
||
|
|
// Try to match the entire hostname first
|
||
|
|
if r, ok := c.DomainRealm[domainName]; ok {
|
||
|
|
return r
|
||
|
|
}
|
||
|
|
|
||
|
|
// Try to match all DNS domain parts
|
||
|
|
periods := strings.Count(domainName, ".") + 1
|
||
|
|
for i := 2; i <= periods; i++ {
|
||
|
|
z := strings.SplitN(domainName, ".", i)
|
||
|
|
if r, ok := c.DomainRealm["."+z[len(z)-1]]; ok {
|
||
|
|
return r
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return c.LibDefaults.DefaultRealm
|
||
|
|
}
|
||
|
|
|
||
|
|
// Load the KRB5 configuration from the specified file path.
|
||
|
|
func Load(cfgPath string) (*Config, error) {
|
||
|
|
fh, err := os.Open(cfgPath)
|
||
|
|
if err != nil {
|
||
|
|
return nil, errors.New("configuration file could not be opened: " + cfgPath + " " + err.Error())
|
||
|
|
}
|
||
|
|
defer fh.Close()
|
||
|
|
scanner := bufio.NewScanner(fh)
|
||
|
|
return NewFromScanner(scanner)
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewFromString creates a new Config struct from a string.
|
||
|
|
func NewFromString(s string) (*Config, error) {
|
||
|
|
reader := strings.NewReader(s)
|
||
|
|
return NewFromReader(reader)
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewFromReader creates a new Config struct from an io.Reader.
|
||
|
|
func NewFromReader(r io.Reader) (*Config, error) {
|
||
|
|
scanner := bufio.NewScanner(r)
|
||
|
|
return NewFromScanner(scanner)
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewFromScanner creates a new Config struct from a bufio.Scanner.
|
||
|
|
func NewFromScanner(scanner *bufio.Scanner) (*Config, error) {
|
||
|
|
c := New()
|
||
|
|
var e error
|
||
|
|
sections := make(map[int]string)
|
||
|
|
var sectionLineNum []int
|
||
|
|
var lines []string
|
||
|
|
for scanner.Scan() {
|
||
|
|
// Skip comments and blank lines
|
||
|
|
if matched, _ := regexp.MatchString(`^\s*(#|;|\n)`, scanner.Text()); matched {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if matched, _ := regexp.MatchString(`^\s*\[libdefaults\]\s*`, scanner.Text()); matched {
|
||
|
|
sections[len(lines)] = "libdefaults"
|
||
|
|
sectionLineNum = append(sectionLineNum, len(lines))
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if matched, _ := regexp.MatchString(`^\s*\[realms\]\s*`, scanner.Text()); matched {
|
||
|
|
sections[len(lines)] = "realms"
|
||
|
|
sectionLineNum = append(sectionLineNum, len(lines))
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if matched, _ := regexp.MatchString(`^\s*\[domain_realm\]\s*`, scanner.Text()); matched {
|
||
|
|
sections[len(lines)] = "domain_realm"
|
||
|
|
sectionLineNum = append(sectionLineNum, len(lines))
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if matched, _ := regexp.MatchString(`^\s*\[.*\]\s*`, scanner.Text()); matched {
|
||
|
|
sections[len(lines)] = "unknown_section"
|
||
|
|
sectionLineNum = append(sectionLineNum, len(lines))
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
lines = append(lines, scanner.Text())
|
||
|
|
}
|
||
|
|
for i, start := range sectionLineNum {
|
||
|
|
var end int
|
||
|
|
if i+1 >= len(sectionLineNum) {
|
||
|
|
end = len(lines)
|
||
|
|
} else {
|
||
|
|
end = sectionLineNum[i+1]
|
||
|
|
}
|
||
|
|
switch section := sections[start]; section {
|
||
|
|
case "libdefaults":
|
||
|
|
err := c.LibDefaults.parseLines(lines[start:end])
|
||
|
|
if err != nil {
|
||
|
|
if _, ok := err.(UnsupportedDirective); !ok {
|
||
|
|
return nil, fmt.Errorf("error processing libdefaults section: %v", err)
|
||
|
|
}
|
||
|
|
e = err
|
||
|
|
}
|
||
|
|
case "realms":
|
||
|
|
realms, err := parseRealms(lines[start:end])
|
||
|
|
if err != nil {
|
||
|
|
if _, ok := err.(UnsupportedDirective); !ok {
|
||
|
|
return nil, fmt.Errorf("error processing realms section: %v", err)
|
||
|
|
}
|
||
|
|
e = err
|
||
|
|
}
|
||
|
|
c.Realms = realms
|
||
|
|
case "domain_realm":
|
||
|
|
err := c.DomainRealm.parseLines(lines[start:end])
|
||
|
|
if err != nil {
|
||
|
|
if _, ok := err.(UnsupportedDirective); !ok {
|
||
|
|
return nil, fmt.Errorf("error processing domaain_realm section: %v", err)
|
||
|
|
}
|
||
|
|
e = err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return c, e
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse a space delimited list of ETypes into a list of EType numbers optionally filtering out weak ETypes.
|
||
|
|
func parseETypes(s []string, w bool) []int32 {
|
||
|
|
var eti []int32
|
||
|
|
for _, et := range s {
|
||
|
|
if !w {
|
||
|
|
var weak bool
|
||
|
|
for _, wet := range strings.Fields(WeakETypeList) {
|
||
|
|
if et == wet {
|
||
|
|
weak = true
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if weak {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
i := etypeID.EtypeSupported(et)
|
||
|
|
if i != 0 {
|
||
|
|
eti = append(eti, i)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return eti
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse a time duration string in the configuration to a golang time.Duration.
|
||
|
|
func parseDuration(s string) (time.Duration, error) {
|
||
|
|
s = strings.Replace(strings.TrimSpace(s), " ", "", -1)
|
||
|
|
|
||
|
|
// handle Nd[NmNs]
|
||
|
|
if strings.Contains(s, "d") {
|
||
|
|
ds := strings.SplitN(s, "d", 2)
|
||
|
|
dn, err := strconv.ParseUint(ds[0], 10, 32)
|
||
|
|
if err != nil {
|
||
|
|
return time.Duration(0), errors.New("invalid time duration")
|
||
|
|
}
|
||
|
|
d := time.Duration(dn*24) * time.Hour
|
||
|
|
if ds[1] != "" {
|
||
|
|
dp, err := time.ParseDuration(ds[1])
|
||
|
|
if err != nil {
|
||
|
|
return time.Duration(0), errors.New("invalid time duration")
|
||
|
|
}
|
||
|
|
d = d + dp
|
||
|
|
}
|
||
|
|
return d, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// handle Nm[Ns]
|
||
|
|
d, err := time.ParseDuration(s)
|
||
|
|
if err == nil {
|
||
|
|
return d, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// handle N
|
||
|
|
v, err := strconv.ParseUint(s, 10, 32)
|
||
|
|
if err == nil && v > 0 {
|
||
|
|
return time.Duration(v) * time.Second, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// handle h:m[:s]
|
||
|
|
if strings.Contains(s, ":") {
|
||
|
|
t := strings.Split(s, ":")
|
||
|
|
if 2 > len(t) || len(t) > 3 {
|
||
|
|
return time.Duration(0), errors.New("invalid time duration value")
|
||
|
|
}
|
||
|
|
var i []int
|
||
|
|
for _, n := range t {
|
||
|
|
j, err := strconv.ParseInt(n, 10, 16)
|
||
|
|
if err != nil {
|
||
|
|
return time.Duration(0), errors.New("invalid time duration value")
|
||
|
|
}
|
||
|
|
i = append(i, int(j))
|
||
|
|
}
|
||
|
|
d := time.Duration(i[0])*time.Hour + time.Duration(i[1])*time.Minute
|
||
|
|
if len(i) == 3 {
|
||
|
|
d = d + time.Duration(i[2])*time.Second
|
||
|
|
}
|
||
|
|
return d, nil
|
||
|
|
}
|
||
|
|
return time.Duration(0), errors.New("invalid time duration value")
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse possible boolean values to golang bool.
|
||
|
|
func parseBoolean(s string) (bool, error) {
|
||
|
|
s = strings.TrimSpace(s)
|
||
|
|
v, err := strconv.ParseBool(s)
|
||
|
|
if err == nil {
|
||
|
|
return v, nil
|
||
|
|
}
|
||
|
|
switch strings.ToLower(s) {
|
||
|
|
case "yes":
|
||
|
|
return true, nil
|
||
|
|
case "y":
|
||
|
|
return true, nil
|
||
|
|
case "no":
|
||
|
|
return false, nil
|
||
|
|
case "n":
|
||
|
|
return false, nil
|
||
|
|
}
|
||
|
|
return false, errors.New("invalid boolean value")
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse array of strings but stop if an asterisk is placed at the end of a line.
|
||
|
|
func appendUntilFinal(s *[]string, value string, final *bool) {
|
||
|
|
if *final {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if last := len(value) - 1; last >= 0 && value[last] == '*' {
|
||
|
|
*final = true
|
||
|
|
value = value[:len(value)-1]
|
||
|
|
}
|
||
|
|
*s = append(*s, value)
|
||
|
|
}
|
||
|
|
|
||
|
|
// JSON return details of the config in a JSON format.
|
||
|
|
func (c *Config) JSON() (string, error) {
|
||
|
|
b, err := json.MarshalIndent(c, "", " ")
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
return string(b), nil
|
||
|
|
}
|