irmd: Add flow authentication

This adds initial implementation of peer authentication as part of
flow allocation. If credentials are not provided, this will be
accepted and logged as info that the flow is not authenticated.

Certificates and keys are passed as .pem files. The key file should
not be encrypted, else the IRMd will open a prompt for the password.
The default location for these .pem files is in
/etc/ouroboros/security. It is strongly recommended to make this
directory only accessible to root.

├── security
│   ├── cacert
│   │   └── ca.root.o7s.crt.pem
│   ├── client
│   │   ├── <name>
│   │   |   ├── crt.pem
│   │   |   └── key.pem
│   │   └── <name>
|   |       ├──...
|   |
│   ├── server
│   │   ├── <name>
│   │   |   ├── crt.pem
│   │   |   └── key.pem
│   │   └── <name>
|   |       ├── ...
|   |
│   └── untrusted
│       └── sign.root.o7s.crt.pem

Trusted root CA certificates go in the /cacert directory, untrusted
certificates for signature verification go in the /untrusted
directory. The IRMd will load these certificates at boot.  The IRMd
will look for certificates in the /client and /server directories. For
each name a subdirectory can be added and the credentials in that
directory are used to sign the OAP header for flows at flow_alloc() on
the client side and flow_accept() on the server side.

These defaults can be changed at build time using the following
variables (in alphabetical order):
 OUROBOROS_CA_CRT_DIR             /etc/ouroboros/security/cacert
 OUROBOROS_CLI_CRT_DIR            /etc/ouroboros/security/client
 OUROBOROS_SECURITY_DIR           /etc/ouroboros/security
 OUROBOROS_SRV_CRT_DIR            /etc/ouroboros/security/server
 OUROBOROS_UNTRUSTED_DIR          /etc/ouroboros/security/untrusted

The directories for the names can also be configured at IRMd boot
using the configuraton file and at runtime when a name is created
using the "irm name create" CLI tool. The user needs to have
permissions to access the keyfile and certificate when specifying the
paths with the "irm name create" CLI tool.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>

1 files changed, 19 insertions, 9 deletions

diff --git a/src/irmd/reg/name.h b/src/irmd/reg/name.h
index 97ca7f04..30a64e1c 100644
--- a/src/irmd/reg/name.h
+++ b/src/irmd/reg/name.h
@@ -33,14 +33,25 @@ struct reg_name {
 
         struct name_info info;
 
-        struct list_head progs;    /* autostart programs for this name  */
-        size_t           n_progs;  /* number of programs                */
-
-        struct list_head procs;    /* processes bound to this name      */
-        size_t           n_procs;  /* number of processes               */
-
-        struct list_head active;   /* processes actively calling accept */
-        size_t           n_active; /* number of processes accepting     */
+        struct {
+                void * key;
+                void * crt;
+        } cache;
+
+        struct {
+                struct list_head list;
+                size_t           len;
+        } progs;  /* autostart programs for this name  */
+
+        struct {
+                struct list_head list;
+                size_t           len;
+        } procs;  /* processes bound to this name      */
+
+        struct {
+                struct list_head list;
+                size_t           len;
+        } active; /* processes actively calling accept */
 };
 
 struct reg_name * reg_name_create(const struct name_info * info);
@@ -74,5 +85,4 @@ pid_t             reg_name_get_active(struct reg_name * name);
 
 void              reg_name_del_active(struct reg_name * name,
                                       pid_t             proc);
-
 #endif /* OUROBOROS_IRMD_REG_NAME_H */