[pbs-devel] [PATCH proxmox-backup v5 04/11] fix #5379: api2: access: set default realm accordingly on individual update

[Christoph Heiss <c.heiss@proxmox.com>]

Whenever the `default` field is set to `true` for any realm, the
`default` field must be unset first from all realms to ensure that only
ever exactly one realm is the default.

Signed-off-by: Christoph Heiss <c.heiss@proxmox.com>
---
Changes v4 -> v5:
  * no changes

Changes v3 -> v4:
  * no changes

Changes v2 -> v3:
  * removed early return again, which did not work as intended
  * drop unnecessary crate namespace qualification
  * also unset current default realm when creating new realm with
    `default` set
    
Changes v1 -> v2:
  * documented unset_default_realm()
  * added early return to unset_default_realm()

 pbs-config/src/domains.rs        | 15 +++++++++++++++
 src/api2/config/access/ad.rs     | 11 +++++++++++
 src/api2/config/access/ldap.rs   | 11 +++++++++++
 src/api2/config/access/openid.rs | 11 +++++++++++
 4 files changed, 48 insertions(+)

diff --git a/pbs-config/src/domains.rs b/pbs-config/src/domains.rs
index 32bd967a..d94d54a8 100644
--- a/pbs-config/src/domains.rs
+++ b/pbs-config/src/domains.rs
@@ -61,6 +61,21 @@ pub fn save_config(config: &SectionConfigData) -> Result<(), Error> {
     replace_backup_config(DOMAINS_CFG_FILENAME, raw.as_bytes())
 }
 
+/// Unsets the default login realm for users by deleting the `default` property
+/// from the respective realm.
+///
+/// This only updates the configuration as given in `config`, making it
+/// permanent is left to the caller.
+pub fn unset_default_realm(config: &mut SectionConfigData) -> Result<(), Error> {
+    for (_, data) in &mut config.sections.values_mut() {
+        if let Some(obj) = data.as_object_mut() {
+            obj.remove("default");
+        }
+    }
+
+    Ok(())
+}
+
 /// Check if a realm with the given name exists
 pub fn exists(domains: &SectionConfigData, realm: &str) -> bool {
     realm == "pbs" || realm == "pam" || domains.sections.contains_key(realm)
diff --git a/src/api2/config/access/ad.rs b/src/api2/config/access/ad.rs
index 4106e0f4..2afb16b8 100644
--- a/src/api2/config/access/ad.rs
+++ b/src/api2/config/access/ad.rs
@@ -91,6 +91,10 @@ pub async fn create_ad_realm(
         auth_helpers::store_ldap_bind_password(&config.realm, &password, &domain_config_lock)?;
     }
 
+    if let Some(true) = config.default {
+        domains::unset_default_realm(&mut domains)?;
+    }
+
     domains.set_data(&config.realm, "ad", &config)?;
 
     domains::save_config(&domains)?;
@@ -278,6 +282,13 @@ pub async fn update_ad_realm(
         }
     }
 
+    if let Some(true) = update.default {
+        domains::unset_default_realm(&mut domains)?;
+        config.default = Some(true);
+    } else {
+        config.default = None;
+    }
+
     if let Some(mode) = update.mode {
         config.mode = Some(mode);
     }
diff --git a/src/api2/config/access/ldap.rs b/src/api2/config/access/ldap.rs
index 7dcf7990..6a93ece2 100644
--- a/src/api2/config/access/ldap.rs
+++ b/src/api2/config/access/ldap.rs
@@ -81,6 +81,10 @@ pub fn create_ldap_realm(config: LdapRealmConfig, password: Option<String>) -> R
         auth_helpers::store_ldap_bind_password(&config.realm, &password, &domain_config_lock)?;
     }
 
+    if let Some(true) = config.default {
+        domains::unset_default_realm(&mut domains)?;
+    }
+
     domains.set_data(&config.realm, "ldap", &config)?;
 
     domains::save_config(&domains)?;
@@ -317,6 +321,13 @@ pub fn update_ldap_realm(
         }
     }
 
+    if let Some(true) = update.default {
+        domains::unset_default_realm(&mut domains)?;
+        config.default = Some(true);
+    } else {
+        config.default = None;
+    }
+
     if let Some(mode) = update.mode {
         config.mode = Some(mode);
     }
diff --git a/src/api2/config/access/openid.rs b/src/api2/config/access/openid.rs
index 2fbcd1b1..5b767fcc 100644
--- a/src/api2/config/access/openid.rs
+++ b/src/api2/config/access/openid.rs
@@ -65,6 +65,10 @@ pub fn create_openid_realm(config: OpenIdRealmConfig) -> Result<(), Error> {
         param_bail!("realm", "realm '{}' already exists.", config.realm);
     }
 
+    if let Some(true) = config.default {
+        domains::unset_default_realm(&mut domains)?;
+    }
+
     domains.set_data(&config.realm, "openid", &config)?;
 
     domains::save_config(&domains)?;
@@ -247,6 +251,13 @@ pub fn update_openid_realm(
         }
     }
 
+    if let Some(true) = update.default {
+        domains::unset_default_realm(&mut domains)?;
+        config.default = Some(true);
+    } else {
+        config.default = None;
+    }
+
     if let Some(issuer_url) = update.issuer_url {
         config.issuer_url = issuer_url;
     }
-- 
2.48.1



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