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, 75 insertions, 0 deletions

diff --git a/src/lib/tests/auth_test.c b/src/lib/tests/auth_test.c
index a5bf931d..ede294b8 100644
--- a/src/lib/tests/auth_test.c
+++ b/src/lib/tests/auth_test.c
@@ -323,6 +323,45 @@ static int test_crypt_check_pubkey_crt(void)
         return TEST_RC_FAIL;
 }
 
+static int test_store_add(void)
+{
+        struct auth_ctx * ctx;
+        void *            _root_ca_crt;
+
+        TEST_START();
+
+        ctx = auth_create_ctx();
+        if (ctx == NULL) {
+                printf("Failed to create auth context.\n");
+                goto fail_create;
+        }
+
+        if (crypt_load_crt_str(root_ca_crt, &_root_ca_crt) < 0) {
+                printf("Failed to load root crt from string.\n");
+                goto fail_load;
+        }
+
+        if (auth_add_crt_to_store(ctx, _root_ca_crt) < 0) {
+                printf("Failed to add root crt to auth store.\n");
+                goto fail_add;
+        }
+
+        crypt_free_crt(_root_ca_crt);
+        auth_destroy_ctx(ctx);
+
+        TEST_SUCCESS();
+
+        return TEST_RC_SUCCESS;
+
+ fail_add:
+        crypt_free_crt(_root_ca_crt);
+ fail_load:
+        crypt_free_crt(_root_ca_crt);
+ fail_create:
+        TEST_FAIL();
+        return TEST_RC_FAIL;
+}
+
 static int test_verify_crt(void)
 {
         struct auth_ctx * auth;
@@ -532,6 +571,38 @@ int test_auth_bad_signature(void)
         return TEST_RC_FAIL;
 }
 
+int test_crt_str(void)
+{
+        char str[2295];
+        void * crt;
+
+        TEST_START();
+
+        if (crypt_load_crt_str(signed_server_crt, &crt) < 0) {
+                printf("Failed to load certificate from string.\n");
+                goto fail_load;
+        }
+
+        if (crypt_crt_str(crt, str) < 0) {
+                printf("Failed to convert certificate to string.\n");
+                goto fail_to_str;
+        }
+
+        printf("Certificate string:\n%s\n", str);
+
+        crypt_free_crt(crt);
+
+        TEST_SUCCESS();
+
+        return TEST_RC_SUCCESS;
+
+ fail_to_str:
+        crypt_free_crt(crt);
+ fail_load:
+        TEST_FAIL();
+        return TEST_RC_FAIL;
+}
+
 int auth_test(int     argc,
               char ** argv)
 {
@@ -548,9 +619,11 @@ int auth_test(int     argc,
         ret |= test_load_free_privkey();
         ret |= test_load_free_pubkey();
         ret |= test_crypt_check_pubkey_crt();
+        ret |= test_store_add();
         ret |= test_verify_crt();
         ret |= test_auth_sign();
         ret |= test_auth_bad_signature();
+        ret |= test_crt_str();
 #else
         (void) test_load_free_crt;
         (void) test_check_crt_name;
@@ -558,9 +631,11 @@ int auth_test(int     argc,
         (void) test_load_free_privkey;
         (void) test_load_free_pubkey;
         (void) test_crypt_check_pubkey_crt;
+        (void) test_store_add;
         (void) test_verify_crt;
         (void) test_auth_sign;
         (void) test_auth_bad_signature;
+        (void) test_crt_str;
 
         ret = TEST_RC_SKIP;
 #endif