confd: Add YANG pattern constraints for string leaves

Add input validation patterns to string-type leaves in container,
firewall, DHCP, and interface YANG models.  Also use mkdtemp() for
temporary key files in keystore.

Signed-off-by: Mattias Walström <lazzer@gmail.com>

.gitignore

@@ -2,6 +2,7 @@
 .claude
 .gdb_history
 .claude
+AGENTS.md
 /.backup
 /.ccache
 /dl
@@ -11,4 +12,3 @@
 /test/.log
 /local.mk
 /test/spec/Readme.adoc
-

src/confd/src/keystore.c

@@ -12,8 +12,6 @@
 
 #define XPATH_KEYSTORE_ASYM "/ietf-keystore:keystore/asymmetric-keys"
 #define XPATH_KEYSTORE_SYM  "/ietf-keystore:keystore/symmetric-keys"
-#define SSH_PRIVATE_KEY  "/tmp/ssh.key"
-#define SSH_PUBLIC_KEY   "/tmp/ssh.pub"
 
 /* return file size */
 static size_t filesz(const char *fn)
@@ -91,6 +89,9 @@ static int keystore_update(sr_session_ctx_t *session, struct lyd_node *config, s
 	}
 
 	for (size_t i = 0; i < count; i++) {
+		char tmpdir[] = "/tmp/keystore.XXXXXX";
+		char priv_path[sizeof(tmpdir) + 16];
+		char pub_path[sizeof(tmpdir) + 16];
 		char *name = srx_get_str(session, "%s/name", list[i].xpath);
 		char *public_key_format, *private_key_format;
 		char *pub_key = NULL, *priv_key = NULL;
@@ -115,16 +116,24 @@ static int keystore_update(sr_session_ctx_t *session, struct lyd_node *config, s
 			continue;
 
 		NOTE("SSH key (%s) does not exist, generating...", name);
-		if (systemf("/usr/libexec/infix/mkkeys %s %s", SSH_PRIVATE_KEY, SSH_PUBLIC_KEY)) {
+
+		if (!mkdtemp(tmpdir)) {
+			ERRNO("Failed creating temp dir for SSH key generation");
+			goto next;
+		}
+		snprintf(priv_path, sizeof(priv_path), "%s/ssh.key", tmpdir);
+		snprintf(pub_path, sizeof(pub_path), "%s/ssh.pub", tmpdir);
+
+		if (systemf("/usr/libexec/infix/mkkeys %s %s", priv_path, pub_path)) {
 			ERROR("Failed generating SSH keys for %s", name);
 			goto next;
 		}
 
-		priv_key = filerd(SSH_PRIVATE_KEY, filesz(SSH_PRIVATE_KEY));
+		priv_key = filerd(priv_path, filesz(priv_path));
 		if (!priv_key)
 			goto next;
 
-		pub_key = filerd(SSH_PUBLIC_KEY, filesz(SSH_PUBLIC_KEY));
+		pub_key = filerd(pub_path, filesz(pub_path));
 		if (!pub_key)
 			goto next;
 
@@ -140,10 +149,8 @@ static int keystore_update(sr_session_ctx_t *session, struct lyd_node *config, s
 			goto next;
 		}
 	next:
-		if (erase(SSH_PRIVATE_KEY))
-			ERRNO("Failed removing SSH server private key");
-		if (erase(SSH_PUBLIC_KEY))
-			ERRNO("Failed removing SSH server public key");
+		if (rmrf(tmpdir))
+			ERRNO("Failed removing temp dir %s", tmpdir);
 
 		if (priv_key)
 			free(priv_key);

src/confd/yang/confd/infix-containers.yang

@@ -22,6 +22,11 @@ module infix-containers {
     prefix infix-sys;
   }
 
+  revision 2026-02-23 {
+    description "Input validation improvements";
+    reference "internal";
+  }
+
   revision 2025-12-09 {
     description "Add resource management:
                   - Add resource-limit container with memory and cpu configuration.
@@ -84,6 +89,17 @@ module infix-containers {
     }
   }
 
+
+  typedef image-reference {
+    description "OCI image reference or transport URI.
+                 Allows registry references (e.g., quay.io/user/image:tag),
+                 transport prefixes (docker://, oci-archive:, dir:), and
+                 download URLs (ftp://, http://, https://).";
+    type string {
+      pattern '[a-zA-Z0-9][a-zA-Z0-9_./:@=+%~-]*';
+    }
+  }
+
   typedef mount-type {
     type enumeration {
       enum bind {
@@ -181,7 +197,7 @@ module infix-containers {
                            container will be put on a queue that retries pull every time
                            there is a route change in the host's system.";
 	mandatory true;
-	type string;
+	type image-reference;
       }
 
       container checksum {
@@ -240,7 +256,9 @@ module infix-containers {
 
       leaf command {
 	description "Override ENTRYPOINT from image and run command + args.";
-	type string;
+	type string {
+	  pattern '[a-zA-Z0-9_./ :=@%^,+-]+';
+	}
       }
 
       leaf hostname {
@@ -298,7 +316,9 @@ module infix-containers {
                          NOTE: Some (*) options only work with masquerading container bridges,
                                which automatically create VETH pairs with one end in the host
                                bridge and the other in the container.";
-            type string;
+            type string {
+              pattern '[a-zA-Z_][a-zA-Z0-9_]*=[a-zA-Z0-9.:_/-]+';
+            }
           }
         }
 
@@ -310,7 +330,9 @@ module infix-containers {
                          Sample: 8080:80           -- forward tcp port 8080 to container port 80
                                  69:69/udp         -- forward udp port 69 to container port 69
                                  127.0.0.1:8080:80 -- forward only from loopback interface";
-          type string;
+          type string {
+            pattern '[0-9.:\[\]]+(/[a-zA-Z]+)?';
+          }
         }
 
         leaf-list dns {
@@ -464,7 +486,7 @@ module infix-containers {
                        When mounting files, directories (and globs) from the host,
                        the source must be an absolute path.";
               type string {
-                pattern '/.*';
+                pattern '/[a-zA-Z0-9_./*?-]+([ ]?[a-zA-Z0-9_./*?-]+)*';
               }
             }
           }
@@ -493,7 +515,7 @@ module infix-containers {
                        or import the text file using the 'content' node.";
           mandatory true;
           type string {
-            pattern '/.*';
+            pattern '/[a-zA-Z0-9_./-]+(/[a-zA-Z0-9_./-]+)*';
           }
         }
 
@@ -545,7 +567,7 @@ module infix-containers {
 	  description "Absolute path to target destination directory inside the container.";
 	  mandatory true;
           type string {
-            pattern '/.*';
+            pattern '/[a-zA-Z0-9_./-]+(/[a-zA-Z0-9_./-]+)*';
           }
 	}
       }
@@ -593,12 +615,12 @@ module infix-containers {
     input {
       leaf uri {
         description "The URL or local file path, e.g., /lib/oci/archive.tar.gz";
-        type string;
+        type image-reference;
         mandatory true;
       }
       leaf name {
         description "Image name[:tag], default: basename of archive dir + :latest";
-        type string;
+        type image-reference;
       }
     }
   }

src/confd/yang/confd/infix-dhcp-server.yang

@@ -113,7 +113,9 @@ module infix-dhcp-server {
         case default-opt {
           leaf string {
             description "Generic string value.";
-            type string;
+            type string {
+              pattern '[^\p{Cc}]*';
+            }
           }
         }
       }
@@ -150,7 +152,9 @@ module infix-dhcp-server {
 
       leaf description {
         description "Additional information about this subnet (e.g., purpose, location, or notes).";
-        type string;
+        type string {
+          pattern '[^\p{Cc}]*';
+        }
       }
 
       leaf enabled {
@@ -206,7 +210,9 @@ module infix-dhcp-server {
 
         leaf description {
           description "Additional information about this entry, e.g., owner's name, equipment details, or location.";
-          type string;
+          type string {
+            pattern '[^\p{Cc}]*';
+          }
         }
 
         container match {

src/confd/yang/confd/infix-firewall.yang

@@ -201,7 +201,9 @@ module infix-firewall {
 
       leaf description {
         description "Free-form description of the zone.";
-        type string;
+        type string {
+          pattern '[^\p{Cc}<>&]*';
+        }
       }
 
       leaf-list interface {
@@ -304,7 +306,9 @@ module infix-firewall {
 
       leaf description {
         description "Free-form description of this policy's purpose and scope.";
-        type string;
+        type string {
+          pattern '[^\p{Cc}<>&]*';
+        }
       }
 
       leaf-list ingress {
@@ -421,7 +425,9 @@ module infix-firewall {
 
       leaf description {
         description "Free-form description of the service.";
-        type string;
+        type string {
+          pattern '[^\p{Cc}<>&]*';
+        }
       }
 
       list port {

src/confd/yang/confd/infix-interfaces.yang

@@ -204,6 +204,7 @@ module infix-interfaces {
     deviate replace {
       type string {
         length "0..64";
+        pattern '[^\p{Cc}]*';
       }
     }
   }

src/confd/yang/containers.inc

@@ -1,5 +1,5 @@
 # -*- sh -*-
 MODULES=(
     "infix-interfaces -e containers"
-    "infix-containers@2025-12-09.yang"
+    "infix-containers@2026-02-23.yang"
 )