Add ability to list users with an LDAP search request

Cargo.toml

@@ -12,6 +12,7 @@ actix-service = "2.0.0-beta.4"
 actix-web = "4.0.0-beta.3"
 anyhow = "*"
 clap = "3.0.0-beta.2"
+chrono = "*"
 futures = "*"
 futures-util = "*"
 http = "*"

src/domain/handler.rs

@@ -9,14 +9,25 @@ pub struct BindRequest {
 }
 
 #[cfg_attr(test, derive(PartialEq, Eq, Debug))]
-pub struct SearchRequest {}
+pub struct ListUsersRequest {
+    // filters
+    pub attrs: Vec<String>,
+}
 
 #[cfg_attr(test, derive(PartialEq, Eq, Debug))]
-pub struct SearchResponse {}
+pub struct User {
+    pub user_id: String,
+    pub email: String,
+    pub display_name: String,
+    pub first_name: String,
+    pub last_name: String,
+    // pub avatar: ?,
+    pub creation_date: chrono::NaiveDateTime,
+}
 
 pub trait BackendHandler: Clone + Send {
     fn bind(&mut self, request: BindRequest) -> Result<()>;
-    fn search(&mut self, request: SearchRequest) -> Result<SearchResponse>;
+    fn list_users(&mut self, request: ListUsersRequest) -> Result<Vec<User>>;
 }
 
 #[derive(Debug, Clone)]
@@ -48,8 +59,8 @@ impl BackendHandler for SqlBackendHandler {
         }
     }
 
-    fn search(&mut self, request: SearchRequest) -> Result<SearchResponse> {
-        Ok(SearchResponse {})
+    fn list_users(&mut self, request: ListUsersRequest) -> Result<Vec<User>> {
+        Ok(Vec::new())
     }
 }
 
@@ -61,6 +72,6 @@ mockall::mock! {
     }
     impl BackendHandler for TestBackendHandler {
         fn bind(&mut self, request: BindRequest) -> Result<()>;
-        fn search(&mut self, request: SearchRequest) -> Result<SearchResponse>;
+        fn list_users(&mut self, request: ListUsersRequest) -> Result<Vec<User>>;
     }
 }

src/infra/configuration.rs

@@ -13,6 +13,7 @@ pub struct Configuration {
     pub ldaps_port: u16,
     pub http_port: u16,
     pub secret_pepper: String,
+    pub ldap_base_dn: String,
     pub ldap_user_dn: String,
     pub ldap_user_pass: String,
     pub database_url: String,
@@ -26,6 +27,7 @@ impl Default for Configuration {
             ldaps_port: 6360,
             http_port: 17170,
             secret_pepper: String::from("secretsecretpepper"),
+            ldap_base_dn: String::from("dc=example,dc=com"),
             ldap_user_dn: String::new(),
             ldap_user_pass: String::new(),
             database_url: String::from("sqlite://users.db?mode=rwc"),

src/infra/ldap_handler.rs

@@ -1,16 +1,102 @@
-use crate::domain::handler::BackendHandler;
+use crate::domain::handler::{BackendHandler, ListUsersRequest, User};
+use anyhow::{bail, Result};
 use ldap3_server::simple::*;
 
+fn make_dn_pair<'a, I>(mut iter: I) -> Result<(String, String)>
+where
+    I: Iterator<Item = String>,
+{
+    let pair = (
+        iter.next()
+            .ok_or(anyhow::Error::msg("Empty DN element"))?
+            .clone(),
+        iter.next()
+            .ok_or(anyhow::Error::msg("Missing DN value"))?
+            .clone(),
+    );
+    if let Some(e) = iter.next() {
+        bail!(
+            r#"Too many elements in distinguished name: "{:?}", "{:?}", "{:?}""#,
+            pair.0,
+            pair.1,
+            e
+        )
+    }
+    Ok(pair)
+}
+
+fn parse_distinguished_name(dn: &str) -> Result<Vec<(String, String)>> {
+    dn.split(",")
+        .map(|s| make_dn_pair(s.split("=").map(String::from)))
+        .collect()
+}
+
+fn make_ldap_search_result_entry(user: User, base_dn_str: &str) -> LdapSearchResultEntry {
+    LdapSearchResultEntry {
+        dn: format!("cn={},{}", user.user_id, base_dn_str),
+        attributes: vec![
+            LdapPartialAttribute {
+                atype: "objectClass".to_string(),
+                vals: vec![
+                    "inetOrgPerson".to_string(),
+                    "posixAccount".to_string(),
+                    "mailAccount".to_string(),
+                ],
+            },
+            LdapPartialAttribute {
+                atype: "uid".to_string(),
+                vals: vec![user.user_id],
+            },
+            LdapPartialAttribute {
+                atype: "mail".to_string(),
+                vals: vec![user.email],
+            },
+            LdapPartialAttribute {
+                atype: "givenName".to_string(),
+                vals: vec![user.first_name],
+            },
+            LdapPartialAttribute {
+                atype: "sn".to_string(),
+                vals: vec![user.last_name],
+            },
+            LdapPartialAttribute {
+                atype: "cn".to_string(),
+                vals: vec![user.display_name],
+            },
+        ],
+    }
+}
+
+fn is_subtree(subtree: &Vec<(String, String)>, base_tree: &Vec<(String, String)>) -> bool {
+    if subtree.len() < base_tree.len() {
+        return false;
+    }
+    let size_diff = subtree.len() - base_tree.len();
+    for i in 0..base_tree.len() {
+        if subtree[size_diff + i] != base_tree[i] {
+            return false;
+        }
+    }
+    true
+}
+
 pub struct LdapHandler<Backend: BackendHandler> {
     dn: String,
     backend_handler: Backend,
+    pub base_dn: Vec<(String, String)>,
+    base_dn_str: String,
 }
 
 impl<Backend: BackendHandler> LdapHandler<Backend> {
-    pub fn new(backend_handler: Backend) -> Self {
+    pub fn new(backend_handler: Backend, ldap_base_dn: String) -> Self {
         Self {
             dn: "Unauthenticated".to_string(),
             backend_handler,
+            base_dn: parse_distinguished_name(&ldap_base_dn).expect(&format!(
+                "Invalid value for ldap_base_dn in configuration: {}",
+                ldap_base_dn
+            )),
+            base_dn_str: ldap_base_dn,
         }
     }
 
@@ -30,35 +116,35 @@ impl<Backend: BackendHandler> LdapHandler<Backend> {
     }
 
     pub fn do_search(&mut self, lsr: &SearchRequest) -> Vec<LdapMsg> {
-        vec![
-            lsr.gen_result_entry(LdapSearchResultEntry {
-                dn: "cn=hello,dc=example,dc=com".to_string(),
-                attributes: vec![
-                    LdapPartialAttribute {
-                        atype: "objectClass".to_string(),
-                        vals: vec!["cursed".to_string()],
-                    },
-                    LdapPartialAttribute {
-                        atype: "cn".to_string(),
-                        vals: vec!["hello".to_string()],
-                    },
-                ],
-            }),
-            lsr.gen_result_entry(LdapSearchResultEntry {
-                dn: "cn=world,dc=example,dc=com".to_string(),
-                attributes: vec![
-                    LdapPartialAttribute {
-                        atype: "objectClass".to_string(),
-                        vals: vec!["cursed".to_string()],
-                    },
-                    LdapPartialAttribute {
-                        atype: "cn".to_string(),
-                        vals: vec!["world".to_string()],
-                    },
-                ],
-            }),
-            lsr.gen_success(),
-        ]
+        let dn_parts = match parse_distinguished_name(&lsr.base) {
+            Ok(dn) => dn,
+            Err(_) => {
+                return vec![lsr.gen_error(
+                    LdapResultCode::OperationsError,
+                    format!(r#"Could not parse base DN: "{}""#, lsr.base),
+                )]
+            }
+        };
+        if !is_subtree(&dn_parts, &self.base_dn) {
+            return vec![lsr.gen_success()];
+        }
+        let users = match self.backend_handler.list_users(ListUsersRequest {
+            attrs: lsr.attrs.clone(),
+        }) {
+            Ok(users) => users,
+            Err(e) => {
+                return vec![lsr.gen_error(
+                    LdapResultCode::Other,
+                    format!(r#"Error during search for "{}": {}"#, lsr.base, e),
+                )]
+            }
+        };
+        let mut res = users
+            .into_iter()
+            .map(|u| lsr.gen_result_entry(make_ldap_search_result_entry(u, &self.base_dn_str)))
+            .collect::<Vec<_>>();
+        res.push(lsr.gen_success());
+        res
     }
 
     pub fn do_whoami(&mut self, wr: &WhoamiRequest) -> LdapMsg {
@@ -87,6 +173,7 @@ impl<Backend: BackendHandler> LdapHandler<Backend> {
 mod tests {
     use super::*;
     use crate::domain::handler::MockTestBackendHandler;
+    use chrono::NaiveDateTime;
     use mockall::predicate::eq;
 
     #[test]
@@ -99,7 +186,7 @@ mod tests {
             }))
             .times(1)
             .return_once(|_| Ok(()));
-        let mut ldap_handler = LdapHandler::new(mock);
+        let mut ldap_handler = LdapHandler::new(mock, "dc=example,dc=com".to_string());
 
         let request = WhoamiRequest { msgid: 1 };
         assert_eq!(
@@ -120,4 +207,139 @@ mod tests {
             request.gen_success("dn: test")
         );
     }
+
+    #[test]
+    fn test_is_subtree() {
+        let subtree1 = vec![
+            ("ou".to_string(), "people".to_string()),
+            ("dc".to_string(), "example".to_string()),
+            ("dc".to_string(), "com".to_string()),
+        ];
+        let root = vec![
+            ("dc".to_string(), "example".to_string()),
+            ("dc".to_string(), "com".to_string()),
+        ];
+        assert!(is_subtree(&subtree1, &root));
+        assert!(!is_subtree(&vec![], &root));
+    }
+
+    #[test]
+    fn test_parse_distinguished_name() {
+        let parsed_dn = vec![
+            ("ou".to_string(), "people".to_string()),
+            ("dc".to_string(), "example".to_string()),
+            ("dc".to_string(), "com".to_string()),
+        ];
+        assert_eq!(
+            parse_distinguished_name("ou=people,dc=example,dc=com").expect("parsing failed"),
+            parsed_dn
+        );
+    }
+
+    #[test]
+    fn test_search() {
+        let mut mock = MockTestBackendHandler::new();
+        mock.expect_bind().return_once(|_| Ok(()));
+        mock.expect_list_users()
+            .with(eq(ListUsersRequest { attrs: vec![] }))
+            .times(1)
+            .return_once(|_| {
+                Ok(vec![
+                    User {
+                        user_id: "bob_1".to_string(),
+                        email: "bob@bobmail.bob".to_string(),
+                        display_name: "Bôb Böbberson".to_string(),
+                        first_name: "Bôb".to_string(),
+                        last_name: "Böbberson".to_string(),
+                        creation_date: NaiveDateTime::from_timestamp(1_000_000_000, 0),
+                    },
+                    User {
+                        user_id: "jim".to_string(),
+                        email: "jim@cricket.jim".to_string(),
+                        display_name: "Jimminy Cricket".to_string(),
+                        first_name: "Jim".to_string(),
+                        last_name: "Cricket".to_string(),
+                        creation_date: NaiveDateTime::from_timestamp(1_003_000_000, 0),
+                    },
+                ])
+            });
+        let mut ldap_handler = LdapHandler::new(mock, "dc=example,dc=com".to_string());
+        let request = SimpleBindRequest {
+            msgid: 1,
+            dn: "test".to_string(),
+            pw: "pass".to_string(),
+        };
+        assert_eq!(ldap_handler.do_bind(&request), request.gen_success());
+        let request = SearchRequest {
+            msgid: 2,
+            base: "ou=people,dc=example,dc=com".to_string(),
+            scope: LdapSearchScope::Base,
+            filter: LdapFilter::And(vec![]),
+            attrs: vec![],
+        };
+        assert_eq!(
+            ldap_handler.do_search(&request),
+            vec![
+                request.gen_result_entry(LdapSearchResultEntry {
+                    dn: "cn=bob_1,dc=example,dc=com".to_string(),
+                    attributes: vec![
+                        LdapPartialAttribute {
+                            atype: "objectClass".to_string(),
+                            vals: vec!["inetOrgPerson".to_string(), "posixAccount".to_string(), "mailAccount".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "uid".to_string(),
+                            vals: vec!["bob_1".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "mail".to_string(),
+                            vals: vec!["bob@bobmail.bob".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "givenName".to_string(),
+                            vals: vec!["Bôb".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "sn".to_string(),
+                            vals: vec!["Böbberson".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "cn".to_string(),
+                            vals: vec!["Bôb Böbberson".to_string()]
+                        }
+                    ],
+                }),
+                request.gen_result_entry(LdapSearchResultEntry {
+                    dn: "cn=jim,dc=example,dc=com".to_string(),
+                    attributes: vec![
+                        LdapPartialAttribute {
+                            atype: "objectClass".to_string(),
+                            vals: vec!["inetOrgPerson".to_string(), "posixAccount".to_string(), "mailAccount".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "uid".to_string(),
+                            vals: vec!["jim".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "mail".to_string(),
+                            vals: vec!["jim@cricket.jim".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "givenName".to_string(),
+                            vals: vec!["Jim".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "sn".to_string(),
+                            vals: vec!["Cricket".to_string()]
+                        },
+                        LdapPartialAttribute {
+                            atype: "cn".to_string(),
+                            vals: vec!["Jimminy Cricket".to_string()]
+                        }
+                    ],
+                }),
+                request.gen_success()
+            ]
+        );
+    }
 }

src/infra/ldap_server.rs

@@ -64,18 +64,21 @@ where
 {
     use futures_util::StreamExt;
 
+    let ldap_base_dn = config.ldap_base_dn.clone();
     Ok(
         server_builder.bind("ldap", ("0.0.0.0", config.ldap_port), move || {
             let backend_handler = backend_handler.clone();
+            let ldap_base_dn = ldap_base_dn.clone();
             pipeline_factory(fn_service(move |mut stream: TcpStream| {
                 let backend_handler = backend_handler.clone();
+                let ldap_base_dn = ldap_base_dn.clone();
                 async move {
                     // Configure the codec etc.
                     let (r, w) = stream.split();
                     let mut requests = FramedRead::new(r, LdapCodec);
                     let mut resp = FramedWrite::new(w, LdapCodec);
 
-                    let mut session = LdapHandler::new(backend_handler);
+                    let mut session = LdapHandler::new(backend_handler, ldap_base_dn);
 
                     while let Some(msg) = requests.next().await {
                         if !handle_incoming_message(msg, &mut resp, &mut session).await? {