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450 lines
15 KiB
Go
450 lines
15 KiB
Go
// File contains Search functionality
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//
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// https://tools.ietf.org/html/rfc4511
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//
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// SearchRequest ::= [APPLICATION 3] SEQUENCE {
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// baseObject LDAPDN,
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// scope ENUMERATED {
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// baseObject (0),
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// singleLevel (1),
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// wholeSubtree (2),
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// ... },
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// derefAliases ENUMERATED {
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// neverDerefAliases (0),
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// derefInSearching (1),
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// derefFindingBaseObj (2),
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// derefAlways (3) },
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// sizeLimit INTEGER (0 .. maxInt),
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// timeLimit INTEGER (0 .. maxInt),
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// typesOnly BOOLEAN,
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// filter Filter,
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// attributes AttributeSelection }
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//
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// AttributeSelection ::= SEQUENCE OF selector LDAPString
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// -- The LDAPString is constrained to
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// -- <attributeSelector> in Section 4.5.1.8
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//
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// Filter ::= CHOICE {
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// and [0] SET SIZE (1..MAX) OF filter Filter,
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// or [1] SET SIZE (1..MAX) OF filter Filter,
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// not [2] Filter,
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// equalityMatch [3] AttributeValueAssertion,
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// substrings [4] SubstringFilter,
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// greaterOrEqual [5] AttributeValueAssertion,
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// lessOrEqual [6] AttributeValueAssertion,
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// present [7] AttributeDescription,
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// approxMatch [8] AttributeValueAssertion,
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// extensibleMatch [9] MatchingRuleAssertion,
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// ... }
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//
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// SubstringFilter ::= SEQUENCE {
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// type AttributeDescription,
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// substrings SEQUENCE SIZE (1..MAX) OF substring CHOICE {
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// initial [0] AssertionValue, -- can occur at most once
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// any [1] AssertionValue,
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// final [2] AssertionValue } -- can occur at most once
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// }
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//
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// MatchingRuleAssertion ::= SEQUENCE {
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// matchingRule [1] MatchingRuleId OPTIONAL,
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// type [2] AttributeDescription OPTIONAL,
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// matchValue [3] AssertionValue,
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// dnAttributes [4] BOOLEAN DEFAULT FALSE }
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//
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//
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package ldap
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import (
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"errors"
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"fmt"
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"sort"
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"strings"
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"gopkg.in/asn1-ber.v1"
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)
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// scope choices
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const (
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ScopeBaseObject = 0
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ScopeSingleLevel = 1
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ScopeWholeSubtree = 2
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)
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// ScopeMap contains human readable descriptions of scope choices
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var ScopeMap = map[int]string{
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ScopeBaseObject: "Base Object",
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ScopeSingleLevel: "Single Level",
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ScopeWholeSubtree: "Whole Subtree",
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}
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// derefAliases
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const (
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NeverDerefAliases = 0
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DerefInSearching = 1
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DerefFindingBaseObj = 2
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DerefAlways = 3
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)
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// DerefMap contains human readable descriptions of derefAliases choices
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var DerefMap = map[int]string{
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NeverDerefAliases: "NeverDerefAliases",
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DerefInSearching: "DerefInSearching",
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DerefFindingBaseObj: "DerefFindingBaseObj",
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DerefAlways: "DerefAlways",
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}
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// NewEntry returns an Entry object with the specified distinguished name and attribute key-value pairs.
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// The map of attributes is accessed in alphabetical order of the keys in order to ensure that, for the
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// same input map of attributes, the output entry will contain the same order of attributes
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func NewEntry(dn string, attributes map[string][]string) *Entry {
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var attributeNames []string
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for attributeName := range attributes {
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attributeNames = append(attributeNames, attributeName)
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}
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sort.Strings(attributeNames)
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var encodedAttributes []*EntryAttribute
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for _, attributeName := range attributeNames {
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encodedAttributes = append(encodedAttributes, NewEntryAttribute(attributeName, attributes[attributeName]))
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}
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return &Entry{
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DN: dn,
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Attributes: encodedAttributes,
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}
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}
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// Entry represents a single search result entry
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type Entry struct {
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// DN is the distinguished name of the entry
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DN string
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// Attributes are the returned attributes for the entry
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Attributes []*EntryAttribute
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}
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// GetAttributeValues returns the values for the named attribute, or an empty list
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func (e *Entry) GetAttributeValues(attribute string) []string {
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for _, attr := range e.Attributes {
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if attr.Name == attribute {
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return attr.Values
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}
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}
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return []string{}
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}
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// GetRawAttributeValues returns the byte values for the named attribute, or an empty list
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func (e *Entry) GetRawAttributeValues(attribute string) [][]byte {
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for _, attr := range e.Attributes {
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if attr.Name == attribute {
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return attr.ByteValues
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}
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}
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return [][]byte{}
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}
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// GetAttributeValue returns the first value for the named attribute, or ""
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func (e *Entry) GetAttributeValue(attribute string) string {
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values := e.GetAttributeValues(attribute)
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if len(values) == 0 {
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return ""
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}
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return values[0]
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}
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// GetRawAttributeValue returns the first value for the named attribute, or an empty slice
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func (e *Entry) GetRawAttributeValue(attribute string) []byte {
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values := e.GetRawAttributeValues(attribute)
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if len(values) == 0 {
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return []byte{}
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}
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return values[0]
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}
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// Print outputs a human-readable description
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func (e *Entry) Print() {
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fmt.Printf("DN: %s\n", e.DN)
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for _, attr := range e.Attributes {
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attr.Print()
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}
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}
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// PrettyPrint outputs a human-readable description indenting
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func (e *Entry) PrettyPrint(indent int) {
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fmt.Printf("%sDN: %s\n", strings.Repeat(" ", indent), e.DN)
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for _, attr := range e.Attributes {
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attr.PrettyPrint(indent + 2)
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}
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}
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// NewEntryAttribute returns a new EntryAttribute with the desired key-value pair
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func NewEntryAttribute(name string, values []string) *EntryAttribute {
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var bytes [][]byte
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for _, value := range values {
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bytes = append(bytes, []byte(value))
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}
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return &EntryAttribute{
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Name: name,
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Values: values,
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ByteValues: bytes,
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}
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}
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// EntryAttribute holds a single attribute
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type EntryAttribute struct {
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// Name is the name of the attribute
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Name string
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// Values contain the string values of the attribute
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Values []string
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// ByteValues contain the raw values of the attribute
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ByteValues [][]byte
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}
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// Print outputs a human-readable description
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func (e *EntryAttribute) Print() {
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fmt.Printf("%s: %s\n", e.Name, e.Values)
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}
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// PrettyPrint outputs a human-readable description with indenting
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func (e *EntryAttribute) PrettyPrint(indent int) {
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fmt.Printf("%s%s: %s\n", strings.Repeat(" ", indent), e.Name, e.Values)
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}
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// SearchResult holds the server's response to a search request
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type SearchResult struct {
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// Entries are the returned entries
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Entries []*Entry
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// Referrals are the returned referrals
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Referrals []string
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// Controls are the returned controls
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Controls []Control
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}
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// Print outputs a human-readable description
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func (s *SearchResult) Print() {
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for _, entry := range s.Entries {
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entry.Print()
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}
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}
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// PrettyPrint outputs a human-readable description with indenting
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func (s *SearchResult) PrettyPrint(indent int) {
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for _, entry := range s.Entries {
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entry.PrettyPrint(indent)
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}
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}
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// SearchRequest represents a search request to send to the server
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type SearchRequest struct {
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BaseDN string
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Scope int
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DerefAliases int
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SizeLimit int
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TimeLimit int
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TypesOnly bool
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Filter string
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Attributes []string
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Controls []Control
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}
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func (s *SearchRequest) encode() (*ber.Packet, error) {
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request := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationSearchRequest, nil, "Search Request")
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request.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, s.BaseDN, "Base DN"))
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request.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagEnumerated, uint64(s.Scope), "Scope"))
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request.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagEnumerated, uint64(s.DerefAliases), "Deref Aliases"))
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request.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, uint64(s.SizeLimit), "Size Limit"))
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request.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, uint64(s.TimeLimit), "Time Limit"))
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request.AppendChild(ber.NewBoolean(ber.ClassUniversal, ber.TypePrimitive, ber.TagBoolean, s.TypesOnly, "Types Only"))
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// compile and encode filter
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filterPacket, err := CompileFilter(s.Filter)
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if err != nil {
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return nil, err
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}
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request.AppendChild(filterPacket)
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// encode attributes
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attributesPacket := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "Attributes")
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for _, attribute := range s.Attributes {
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attributesPacket.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, attribute, "Attribute"))
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}
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request.AppendChild(attributesPacket)
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return request, nil
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}
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// NewSearchRequest creates a new search request
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func NewSearchRequest(
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BaseDN string,
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Scope, DerefAliases, SizeLimit, TimeLimit int,
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TypesOnly bool,
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Filter string,
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Attributes []string,
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Controls []Control,
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) *SearchRequest {
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return &SearchRequest{
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BaseDN: BaseDN,
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Scope: Scope,
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DerefAliases: DerefAliases,
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SizeLimit: SizeLimit,
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TimeLimit: TimeLimit,
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TypesOnly: TypesOnly,
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Filter: Filter,
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Attributes: Attributes,
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Controls: Controls,
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}
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}
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// SearchWithPaging accepts a search request and desired page size in order to execute LDAP queries to fulfill the
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// search request. All paged LDAP query responses will be buffered and the final result will be returned atomically.
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// The following four cases are possible given the arguments:
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// - given SearchRequest missing a control of type ControlTypePaging: we will add one with the desired paging size
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// - given SearchRequest contains a control of type ControlTypePaging that isn't actually a ControlPaging: fail without issuing any queries
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// - given SearchRequest contains a control of type ControlTypePaging with pagingSize equal to the size requested: no change to the search request
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// - given SearchRequest contains a control of type ControlTypePaging with pagingSize not equal to the size requested: fail without issuing any queries
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// A requested pagingSize of 0 is interpreted as no limit by LDAP servers.
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func (l *Conn) SearchWithPaging(searchRequest *SearchRequest, pagingSize uint32) (*SearchResult, error) {
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var pagingControl *ControlPaging
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control := FindControl(searchRequest.Controls, ControlTypePaging)
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if control == nil {
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pagingControl = NewControlPaging(pagingSize)
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searchRequest.Controls = append(searchRequest.Controls, pagingControl)
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} else {
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castControl, ok := control.(*ControlPaging)
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if !ok {
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return nil, fmt.Errorf("expected paging control to be of type *ControlPaging, got %v", control)
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}
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if castControl.PagingSize != pagingSize {
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return nil, fmt.Errorf("paging size given in search request (%d) conflicts with size given in search call (%d)", castControl.PagingSize, pagingSize)
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}
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pagingControl = castControl
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}
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searchResult := new(SearchResult)
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for {
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result, err := l.Search(searchRequest)
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l.Debug.Printf("Looking for Paging Control...")
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if err != nil {
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return searchResult, err
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}
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if result == nil {
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return searchResult, NewError(ErrorNetwork, errors.New("ldap: packet not received"))
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}
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for _, entry := range result.Entries {
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searchResult.Entries = append(searchResult.Entries, entry)
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}
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for _, referral := range result.Referrals {
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searchResult.Referrals = append(searchResult.Referrals, referral)
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}
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for _, control := range result.Controls {
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searchResult.Controls = append(searchResult.Controls, control)
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}
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l.Debug.Printf("Looking for Paging Control...")
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pagingResult := FindControl(result.Controls, ControlTypePaging)
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if pagingResult == nil {
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pagingControl = nil
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l.Debug.Printf("Could not find paging control. Breaking...")
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break
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}
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cookie := pagingResult.(*ControlPaging).Cookie
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if len(cookie) == 0 {
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pagingControl = nil
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l.Debug.Printf("Could not find cookie. Breaking...")
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break
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}
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pagingControl.SetCookie(cookie)
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}
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if pagingControl != nil {
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l.Debug.Printf("Abandoning Paging...")
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pagingControl.PagingSize = 0
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l.Search(searchRequest)
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}
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return searchResult, nil
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}
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// Search performs the given search request
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func (l *Conn) Search(searchRequest *SearchRequest) (*SearchResult, error) {
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packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
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packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "MessageID"))
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// encode search request
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encodedSearchRequest, err := searchRequest.encode()
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if err != nil {
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return nil, err
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}
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packet.AppendChild(encodedSearchRequest)
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// encode search controls
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if len(searchRequest.Controls) > 0 {
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packet.AppendChild(encodeControls(searchRequest.Controls))
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}
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l.Debug.PrintPacket(packet)
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msgCtx, err := l.sendMessage(packet)
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if err != nil {
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return nil, err
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}
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defer l.finishMessage(msgCtx)
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result := &SearchResult{
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Entries: make([]*Entry, 0),
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Referrals: make([]string, 0),
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Controls: make([]Control, 0)}
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foundSearchResultDone := false
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for !foundSearchResultDone {
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l.Debug.Printf("%d: waiting for response", msgCtx.id)
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packetResponse, ok := <-msgCtx.responses
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if !ok {
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return nil, NewError(ErrorNetwork, errors.New("ldap: response channel closed"))
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}
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packet, err = packetResponse.ReadPacket()
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l.Debug.Printf("%d: got response %p", msgCtx.id, packet)
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if err != nil {
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return nil, err
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}
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if l.Debug {
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if err := addLDAPDescriptions(packet); err != nil {
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return nil, err
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}
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ber.PrintPacket(packet)
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}
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switch packet.Children[1].Tag {
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case 4:
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entry := new(Entry)
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entry.DN = packet.Children[1].Children[0].Value.(string)
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for _, child := range packet.Children[1].Children[1].Children {
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attr := new(EntryAttribute)
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attr.Name = child.Children[0].Value.(string)
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for _, value := range child.Children[1].Children {
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attr.Values = append(attr.Values, value.Value.(string))
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attr.ByteValues = append(attr.ByteValues, value.ByteValue)
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}
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entry.Attributes = append(entry.Attributes, attr)
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}
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result.Entries = append(result.Entries, entry)
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case 5:
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err := GetLDAPError(packet)
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if err != nil {
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return nil, err
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}
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if len(packet.Children) == 3 {
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for _, child := range packet.Children[2].Children {
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decodedChild, err := DecodeControl(child)
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if err != nil {
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return nil, fmt.Errorf("failed to decode child control: %s", err)
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}
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result.Controls = append(result.Controls, decodedChild)
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}
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}
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foundSearchResultDone = true
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case 19:
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result.Referrals = append(result.Referrals, packet.Children[1].Children[0].Value.(string))
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}
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}
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l.Debug.Printf("%d: returning", msgCtx.id)
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return result, nil
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}
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