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Escape special characters in LDAP DNs when used in search filters

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This commit is contained in:
Ryan Richard 2022-05-02 13:37:32 -07:00
parent 24b0ddf600
commit c74dea6405
2 changed files with 98 additions and 7 deletions
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17
internal/upstreamldap/upstreamldap.go
View File

@ -715,7 +715,9 @@ func (p *Provider) groupSearchRequestedAttributes() []string {
}
func (p *Provider) userSearchFilter(username string) string {
safeUsername := p.escapeUsernameForSearchFilter(username)
// The username is end user input, so it should be escaped before being included in a search to prevent
// query injection.
safeUsername := p.escapeForSearchFilter(username)
if len(p.c.UserSearch.Filter) == 0 {
return fmt.Sprintf("(%s=%s)", p.c.UserSearch.UsernameAttribute, safeUsername)
}
@ -723,10 +725,14 @@ func (p *Provider) userSearchFilter(username string) string {
}
func (p *Provider) groupSearchFilter(userDN string) string {
// The DN can contain characters that are considered special characters by LDAP searches, so it should be
// escaped before being included in the search filter to prevent bad search syntax.
// E.g. for the DN `CN=My User (Admin),OU=Users,OU=my,DC=my,DC=domain` we must escape the parens.
safeUserDN := p.escapeForSearchFilter(userDN)
if len(p.c.GroupSearch.Filter) == 0 {
return fmt.Sprintf("(member=%s)", userDN)
return fmt.Sprintf("(member=%s)", safeUserDN)
}
return interpolateSearchFilter(p.c.GroupSearch.Filter, userDN)
return interpolateSearchFilter(p.c.GroupSearch.Filter, safeUserDN)
}
func interpolateSearchFilter(filterFormat, valueToInterpolateIntoFilter string) string {
@ -737,9 +743,8 @@ func interpolateSearchFilter(filterFormat, valueToInterpolateIntoFilter string)
return "(" + filter + ")"
}
func (p *Provider) escapeUsernameForSearchFilter(username string) string {
// The username is end user input, so it should be escaped before being included in a search to prevent query injection.
return ldap.EscapeFilter(username)
func (p *Provider) escapeForSearchFilter(s string) string {
return ldap.EscapeFilter(s)
}
// Returns the (potentially) binary data of the attribute's value, base64 URL encoded.

88
internal/upstreamldap/upstreamldap_test.go
View File

@ -479,7 +479,7 @@ func TestEndUserAuthentication(t *testing.T) {
wantAuthResponse: expectedAuthResponse(nil),
},
{
name: "when the username has special LDAP search filter characters then they must be properly escaped in the search filter, because the username is end-user input",
name: "when the username has special LDAP search filter characters then they must be properly escaped in the custom user search filter, because the username is end-user input",
username: `a&b|c(d)e\f*g`,
password: testUpstreamPassword,
providerConfig: providerConfig(nil),
@ -497,6 +497,92 @@ func TestEndUserAuthentication(t *testing.T) {
},
wantAuthResponse: expectedAuthResponse(nil),
},
{
name: "when the username has special LDAP search filter characters then they must be properly escaped in the default user search filter, because the username is end-user input",
username: `a&b|c(d)e\f*g`,
password: testUpstreamPassword,
providerConfig: providerConfig(func(p *ProviderConfig) {
p.UserSearch.Filter = ""
}),
searchMocks: func(conn *mockldapconn.MockConn) {
conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
conn.EXPECT().Search(expectedUserSearch(func(r *ldap.SearchRequest) {
r.Filter = fmt.Sprintf("(some-upstream-username-attribute=%s)", `a&b|c\28d\29e\5cf\2ag`)
})).Return(exampleUserSearchResult, nil).Times(1)
conn.EXPECT().SearchWithPaging(expectedGroupSearch(nil), expectedGroupSearchPageSize).
Return(exampleGroupSearchResult, nil).Times(1)
conn.EXPECT().Close().Times(1)
},
bindEndUserMocks: func(conn *mockldapconn.MockConn) {
conn.EXPECT().Bind(testUserSearchResultDNValue, testUpstreamPassword).Times(1)
},
wantAuthResponse: expectedAuthResponse(nil),
},
{
name: "when the user search result DN has special LDAP search filter characters then they must be properly escaped in the custom group search filter",
username: testUpstreamUsername,
password: testUpstreamPassword,
providerConfig: providerConfig(nil),
searchMocks: func(conn *mockldapconn.MockConn) {
conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
conn.EXPECT().Search(expectedUserSearch(nil)).
Return(&ldap.SearchResult{
Entries: []*ldap.Entry{
{
DN: `result DN with * \ special characters ()`,
Attributes: []*ldap.EntryAttribute{
ldap.NewEntryAttribute(testUserSearchUsernameAttribute, []string{testUserSearchResultUsernameAttributeValue}),
ldap.NewEntryAttribute(testUserSearchUIDAttribute, []string{testUserSearchResultUIDAttributeValue}),
},
},
},
}, nil).Times(1)
conn.EXPECT().SearchWithPaging(expectedGroupSearch(func(r *ldap.SearchRequest) {
escapedDN := `result DN with \2a \5c special characters \28\29`
r.Filter = fmt.Sprintf("(some-group-filter=%s-and-more-filter=%s)", escapedDN, escapedDN)
}), expectedGroupSearchPageSize).Return(exampleGroupSearchResult, nil).Times(1)
conn.EXPECT().Close().Times(1)
},
bindEndUserMocks: func(conn *mockldapconn.MockConn) {
conn.EXPECT().Bind(`result DN with * \ special characters ()`, testUpstreamPassword).Times(1)
},
wantAuthResponse: expectedAuthResponse(func(r *authenticators.Response) {
r.DN = `result DN with * \ special characters ()`
}),
},
{
name: "when the user search result DN has special LDAP search filter characters then they must be properly escaped in the default group search filter",
username: testUpstreamUsername,
password: testUpstreamPassword,
providerConfig: providerConfig(func(p *ProviderConfig) {
p.GroupSearch.Filter = ""
}),
searchMocks: func(conn *mockldapconn.MockConn) {
conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
conn.EXPECT().Search(expectedUserSearch(nil)).
Return(&ldap.SearchResult{
Entries: []*ldap.Entry{
{
DN: `result DN with * \ special characters ()`,
Attributes: []*ldap.EntryAttribute{
ldap.NewEntryAttribute(testUserSearchUsernameAttribute, []string{testUserSearchResultUsernameAttributeValue}),
ldap.NewEntryAttribute(testUserSearchUIDAttribute, []string{testUserSearchResultUIDAttributeValue}),
},
},
},
}, nil).Times(1)
conn.EXPECT().SearchWithPaging(expectedGroupSearch(func(r *ldap.SearchRequest) {
r.Filter = fmt.Sprintf("(member=%s)", `result DN with \2a \5c special characters \28\29`)
}), expectedGroupSearchPageSize).Return(exampleGroupSearchResult, nil).Times(1)
conn.EXPECT().Close().Times(1)
},
bindEndUserMocks: func(conn *mockldapconn.MockConn) {
conn.EXPECT().Bind(`result DN with * \ special characters ()`, testUpstreamPassword).Times(1)
},
wantAuthResponse: expectedAuthResponse(func(r *authenticators.Response) {
r.DN = `result DN with * \ special characters ()`
}),
},
{
name: "group names are sorted to make the result more stable/predictable",
username: testUpstreamUsername,