[pbs-devel] [PATCH proxmox-backup] fix #5190: api-types: openid acr format regex

[Gabriel Goller <g.goller@proxmox.com>]

Allow more complex strings for the acr-value when using openid. The
openid documentation only specifies the acr-value *should* be an URI [0].
Implemented a regex that loosely disallows some of the reserved URI
characters specified in the RFC [1].
A value like "urn:mace:incommon:iap:silver" should work.

[0]: https://openid.net/specs/openid-connect-core-1_0.html
[1]: https://www.rfc-editor.org/rfc/rfc2396.txt

Signed-off-by: Gabriel Goller <g.goller@proxmox.com>
---
 pbs-api-types/src/lib.rs    | 3 +++
 pbs-api-types/src/openid.rs | 5 +++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/pbs-api-types/src/lib.rs b/pbs-api-types/src/lib.rs
index 795ff2a6..2668db3e 100644
--- a/pbs-api-types/src/lib.rs
+++ b/pbs-api-types/src/lib.rs
@@ -178,6 +178,9 @@ const_regex! {
     /// any identifier command line tools work with.
     pub PROXMOX_SAFE_ID_REGEX = concat!(r"^", PROXMOX_SAFE_ID_REGEX_STR!(), r"$");
 
+    /// Regex that (loosely) matches URIs according to [RFC 2396](https://www.rfc-editor.org/rfc/rfc2396.txt)
+    pub URI_REGEX = r#"^[^\x00-\x1F\x7F <>#"]*$"#;
+
     pub SINGLE_LINE_COMMENT_REGEX = r"^[[:^cntrl:]]*$";
 
     pub MULTI_LINE_COMMENT_REGEX = r"(?m)^([[:^cntrl:]]*)$";
diff --git a/pbs-api-types/src/openid.rs b/pbs-api-types/src/openid.rs
index 2c7646a3..049137e6 100644
--- a/pbs-api-types/src/openid.rs
+++ b/pbs-api-types/src/openid.rs
@@ -4,6 +4,7 @@ use proxmox_schema::{api, ApiStringFormat, ArraySchema, Schema, StringSchema, Up
 
 use super::{
     PROXMOX_SAFE_ID_FORMAT, PROXMOX_SAFE_ID_REGEX, REALM_ID_SCHEMA, SINGLE_LINE_COMMENT_SCHEMA,
+    URI_REGEX,
 };
 
 pub const OPENID_SCOPE_FORMAT: ApiStringFormat = ApiStringFormat::Pattern(&PROXMOX_SAFE_ID_REGEX);
@@ -24,11 +25,11 @@ pub const OPENID_SCOPE_LIST_SCHEMA: Schema = StringSchema::new("OpenID Scope Lis
     .default(OPENID_DEFAILT_SCOPE_LIST)
     .schema();
 
-pub const OPENID_ACR_FORMAT: ApiStringFormat = ApiStringFormat::Pattern(&PROXMOX_SAFE_ID_REGEX);
+pub const OPENID_ACR_FORMAT: ApiStringFormat = ApiStringFormat::Pattern(&URI_REGEX);
 
 pub const OPENID_ACR_SCHEMA: Schema =
     StringSchema::new("OpenID Authentication Context Class Reference.")
-        .format(&OPENID_SCOPE_FORMAT)
+        .format(&OPENID_ACR_FORMAT)
         .schema();
 
 pub const OPENID_ACR_ARRAY_SCHEMA: Schema =
-- 
2.43.0