mirror of
https://github.com/cwinfo/matterbridge.git
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248 lines
7.5 KiB
Go
248 lines
7.5 KiB
Go
// File contains DN parsing functionality
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//
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// https://tools.ietf.org/html/rfc4514
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//
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// distinguishedName = [ relativeDistinguishedName
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// *( COMMA relativeDistinguishedName ) ]
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// relativeDistinguishedName = attributeTypeAndValue
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// *( PLUS attributeTypeAndValue )
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// attributeTypeAndValue = attributeType EQUALS attributeValue
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// attributeType = descr / numericoid
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// attributeValue = string / hexstring
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//
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// ; The following characters are to be escaped when they appear
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// ; in the value to be encoded: ESC, one of <escaped>, leading
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// ; SHARP or SPACE, trailing SPACE, and NULL.
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// string = [ ( leadchar / pair ) [ *( stringchar / pair )
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// ( trailchar / pair ) ] ]
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//
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// leadchar = LUTF1 / UTFMB
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// LUTF1 = %x01-1F / %x21 / %x24-2A / %x2D-3A /
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// %x3D / %x3F-5B / %x5D-7F
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//
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// trailchar = TUTF1 / UTFMB
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// TUTF1 = %x01-1F / %x21 / %x23-2A / %x2D-3A /
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// %x3D / %x3F-5B / %x5D-7F
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//
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// stringchar = SUTF1 / UTFMB
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// SUTF1 = %x01-21 / %x23-2A / %x2D-3A /
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// %x3D / %x3F-5B / %x5D-7F
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//
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// pair = ESC ( ESC / special / hexpair )
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// special = escaped / SPACE / SHARP / EQUALS
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// escaped = DQUOTE / PLUS / COMMA / SEMI / LANGLE / RANGLE
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// hexstring = SHARP 1*hexpair
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// hexpair = HEX HEX
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//
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// where the productions <descr>, <numericoid>, <COMMA>, <DQUOTE>,
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// <EQUALS>, <ESC>, <HEX>, <LANGLE>, <NULL>, <PLUS>, <RANGLE>, <SEMI>,
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// <SPACE>, <SHARP>, and <UTFMB> are defined in [RFC4512].
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//
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package ldap
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import (
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"bytes"
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enchex "encoding/hex"
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"errors"
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"fmt"
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"strings"
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"github.com/go-asn1-ber/asn1-ber"
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)
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// AttributeTypeAndValue represents an attributeTypeAndValue from https://tools.ietf.org/html/rfc4514
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type AttributeTypeAndValue struct {
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// Type is the attribute type
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Type string
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// Value is the attribute value
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Value string
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}
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// RelativeDN represents a relativeDistinguishedName from https://tools.ietf.org/html/rfc4514
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type RelativeDN struct {
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Attributes []*AttributeTypeAndValue
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}
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// DN represents a distinguishedName from https://tools.ietf.org/html/rfc4514
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type DN struct {
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RDNs []*RelativeDN
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}
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// ParseDN returns a distinguishedName or an error
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func ParseDN(str string) (*DN, error) {
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dn := new(DN)
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dn.RDNs = make([]*RelativeDN, 0)
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rdn := new(RelativeDN)
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rdn.Attributes = make([]*AttributeTypeAndValue, 0)
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buffer := bytes.Buffer{}
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attribute := new(AttributeTypeAndValue)
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escaping := false
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unescapedTrailingSpaces := 0
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stringFromBuffer := func() string {
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s := buffer.String()
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s = s[0 : len(s)-unescapedTrailingSpaces]
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buffer.Reset()
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unescapedTrailingSpaces = 0
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return s
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}
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for i := 0; i < len(str); i++ {
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char := str[i]
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switch {
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case escaping:
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unescapedTrailingSpaces = 0
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escaping = false
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switch char {
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case ' ', '"', '#', '+', ',', ';', '<', '=', '>', '\\':
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buffer.WriteByte(char)
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continue
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}
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// Not a special character, assume hex encoded octet
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if len(str) == i+1 {
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return nil, errors.New("got corrupted escaped character")
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}
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dst := []byte{0}
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n, err := enchex.Decode([]byte(dst), []byte(str[i:i+2]))
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if err != nil {
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return nil, fmt.Errorf("failed to decode escaped character: %s", err)
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} else if n != 1 {
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return nil, fmt.Errorf("expected 1 byte when un-escaping, got %d", n)
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}
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buffer.WriteByte(dst[0])
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i++
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case char == '\\':
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unescapedTrailingSpaces = 0
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escaping = true
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case char == '=':
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attribute.Type = stringFromBuffer()
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// Special case: If the first character in the value is # the
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// following data is BER encoded so we can just fast forward
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// and decode.
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if len(str) > i+1 && str[i+1] == '#' {
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i += 2
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index := strings.IndexAny(str[i:], ",+")
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data := str
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if index > 0 {
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data = str[i : i+index]
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} else {
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data = str[i:]
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}
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rawBER, err := enchex.DecodeString(data)
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if err != nil {
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return nil, fmt.Errorf("failed to decode BER encoding: %s", err)
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}
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packet, err := ber.DecodePacketErr(rawBER)
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if err != nil {
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return nil, fmt.Errorf("failed to decode BER packet: %s", err)
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}
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buffer.WriteString(packet.Data.String())
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i += len(data) - 1
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}
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case char == ',' || char == '+':
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// We're done with this RDN or value, push it
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if len(attribute.Type) == 0 {
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return nil, errors.New("incomplete type, value pair")
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}
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attribute.Value = stringFromBuffer()
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rdn.Attributes = append(rdn.Attributes, attribute)
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attribute = new(AttributeTypeAndValue)
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if char == ',' {
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dn.RDNs = append(dn.RDNs, rdn)
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rdn = new(RelativeDN)
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rdn.Attributes = make([]*AttributeTypeAndValue, 0)
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}
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case char == ' ' && buffer.Len() == 0:
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// ignore unescaped leading spaces
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continue
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default:
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if char == ' ' {
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// Track unescaped spaces in case they are trailing and we need to remove them
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unescapedTrailingSpaces++
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} else {
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// Reset if we see a non-space char
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unescapedTrailingSpaces = 0
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}
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buffer.WriteByte(char)
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}
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}
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if buffer.Len() > 0 {
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if len(attribute.Type) == 0 {
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return nil, errors.New("DN ended with incomplete type, value pair")
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}
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attribute.Value = stringFromBuffer()
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rdn.Attributes = append(rdn.Attributes, attribute)
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dn.RDNs = append(dn.RDNs, rdn)
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}
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return dn, nil
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}
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// Equal returns true if the DNs are equal as defined by rfc4517 4.2.15 (distinguishedNameMatch).
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// Returns true if they have the same number of relative distinguished names
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// and corresponding relative distinguished names (by position) are the same.
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func (d *DN) Equal(other *DN) bool {
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if len(d.RDNs) != len(other.RDNs) {
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return false
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}
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for i := range d.RDNs {
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if !d.RDNs[i].Equal(other.RDNs[i]) {
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return false
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}
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}
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return true
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}
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// AncestorOf returns true if the other DN consists of at least one RDN followed by all the RDNs of the current DN.
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// "ou=widgets,o=acme.com" is an ancestor of "ou=sprockets,ou=widgets,o=acme.com"
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// "ou=widgets,o=acme.com" is not an ancestor of "ou=sprockets,ou=widgets,o=foo.com"
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// "ou=widgets,o=acme.com" is not an ancestor of "ou=widgets,o=acme.com"
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func (d *DN) AncestorOf(other *DN) bool {
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if len(d.RDNs) >= len(other.RDNs) {
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return false
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}
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// Take the last `len(d.RDNs)` RDNs from the other DN to compare against
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otherRDNs := other.RDNs[len(other.RDNs)-len(d.RDNs):]
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for i := range d.RDNs {
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if !d.RDNs[i].Equal(otherRDNs[i]) {
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return false
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}
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}
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return true
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}
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// Equal returns true if the RelativeDNs are equal as defined by rfc4517 4.2.15 (distinguishedNameMatch).
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// Relative distinguished names are the same if and only if they have the same number of AttributeTypeAndValues
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// and each attribute of the first RDN is the same as the attribute of the second RDN with the same attribute type.
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// The order of attributes is not significant.
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// Case of attribute types is not significant.
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func (r *RelativeDN) Equal(other *RelativeDN) bool {
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if len(r.Attributes) != len(other.Attributes) {
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return false
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}
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return r.hasAllAttributes(other.Attributes) && other.hasAllAttributes(r.Attributes)
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}
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func (r *RelativeDN) hasAllAttributes(attrs []*AttributeTypeAndValue) bool {
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for _, attr := range attrs {
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found := false
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for _, myattr := range r.Attributes {
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if myattr.Equal(attr) {
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found = true
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break
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}
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}
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if !found {
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return false
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}
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}
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return true
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}
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// Equal returns true if the AttributeTypeAndValue is equivalent to the specified AttributeTypeAndValue
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// Case of the attribute type is not significant
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func (a *AttributeTypeAndValue) Equal(other *AttributeTypeAndValue) bool {
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return strings.EqualFold(a.Type, other.Type) && a.Value == other.Value
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}
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