1 files changed, 139 insertions, 0 deletions
diff --git a/src/pybind/mgr/volumes/fs/operations/access.py b/src/pybind/mgr/volumes/fs/operations/access.py
new file mode 100644
index 000000000..158e21c26
--- /dev/null
+++ b/src/pybind/mgr/volumes/fs/operations/access.py
@@ -0,0 +1,139 @@
+import errno
+import json
+from typing import List
+
+def prepare_updated_caps_list(existing_caps, mds_cap_str, osd_cap_str, authorize=True):
+    caps_list = [] # type: List[str]
+    for k, v in existing_caps['caps'].items():
+        if k == 'mds' or k == 'osd':
+            continue
+        elif k == 'mon':
+            if not authorize and v == 'allow r':
+                continue
+        caps_list.extend((k,v))
+
+    if mds_cap_str:
+        caps_list.extend(('mds', mds_cap_str))
+    if osd_cap_str:
+        caps_list.extend(('osd', osd_cap_str))
+
+    if authorize and 'mon' not in caps_list:
+        caps_list.extend(('mon', 'allow r'))
+
+    return caps_list
+
+
+def allow_access(mgr, client_entity, want_mds_cap, want_osd_cap,
+                 unwanted_mds_cap, unwanted_osd_cap, existing_caps):
+    if existing_caps is None:
+        ret, out, err = mgr.mon_command({
+            "prefix": "auth get-or-create",
+            "entity": client_entity,
+            "caps": ['mds',  want_mds_cap, 'osd', want_osd_cap, 'mon', 'allow r'],
+            "format": "json"})
+    else:
+        cap = existing_caps[0]
+
+        def cap_update(
+                orig_mds_caps, orig_osd_caps, want_mds_cap,
+                want_osd_cap, unwanted_mds_cap, unwanted_osd_cap):
+
+            if not orig_mds_caps:
+                return want_mds_cap, want_osd_cap
+
+            mds_cap_tokens = [x.strip() for x in orig_mds_caps.split(",")]
+            osd_cap_tokens = [x.strip() for x in orig_osd_caps.split(",")]
+
+            if want_mds_cap in mds_cap_tokens:
+                return orig_mds_caps, orig_osd_caps
+
+            if unwanted_mds_cap in mds_cap_tokens:
+                mds_cap_tokens.remove(unwanted_mds_cap)
+                osd_cap_tokens.remove(unwanted_osd_cap)
+
+            mds_cap_tokens.append(want_mds_cap)
+            osd_cap_tokens.append(want_osd_cap)
+
+            return ",".join(mds_cap_tokens), ",".join(osd_cap_tokens)
+
+        orig_mds_caps = cap['caps'].get('mds', "")
+        orig_osd_caps = cap['caps'].get('osd', "")
+
+        mds_cap_str, osd_cap_str = cap_update(
+            orig_mds_caps, orig_osd_caps, want_mds_cap, want_osd_cap,
+            unwanted_mds_cap, unwanted_osd_cap)
+
+        caps_list = prepare_updated_caps_list(cap, mds_cap_str, osd_cap_str)
+        mgr.mon_command(
+            {
+                "prefix": "auth caps",
+                'entity': client_entity,
+                'caps': caps_list
+            })
+        ret, out, err = mgr.mon_command(
+            {
+                'prefix': 'auth get',
+                'entity': client_entity,
+                'format': 'json'
+            })
+
+    # Result expected like this:
+    # [
+    #     {
+    #         "entity": "client.foobar",
+    #         "key": "AQBY0\/pViX\/wBBAAUpPs9swy7rey1qPhzmDVGQ==",
+    #         "caps": {
+    #             "mds": "allow *",
+    #             "mon": "allow *"
+    #         }
+    #     }
+    # ]
+
+    caps = json.loads(out)
+    assert len(caps) == 1
+    assert caps[0]['entity'] == client_entity
+    return caps[0]['key']
+
+def deny_access(mgr, client_entity, want_mds_caps, want_osd_caps):
+    ret, out, err = mgr.mon_command({
+        "prefix": "auth get",
+        "entity": client_entity,
+        "format": "json",
+    })
+
+    if ret == -errno.ENOENT:
+        # Already gone, great.
+        return
+
+    def cap_remove(orig_mds_caps, orig_osd_caps, want_mds_caps, want_osd_caps):
+        mds_cap_tokens = [x.strip() for x in orig_mds_caps.split(",")]
+        osd_cap_tokens = [x.strip() for x in orig_osd_caps.split(",")]
+
+        for want_mds_cap, want_osd_cap in zip(want_mds_caps, want_osd_caps):
+            if want_mds_cap in mds_cap_tokens:
+                mds_cap_tokens.remove(want_mds_cap)
+                osd_cap_tokens.remove(want_osd_cap)
+                break
+
+        return ",".join(mds_cap_tokens), ",".join(osd_cap_tokens)
+
+    cap = json.loads(out)[0]
+    orig_mds_caps = cap['caps'].get('mds', "")
+    orig_osd_caps = cap['caps'].get('osd', "")
+    mds_cap_str, osd_cap_str = cap_remove(orig_mds_caps, orig_osd_caps,
+                                          want_mds_caps, want_osd_caps)
+
+    caps_list = prepare_updated_caps_list(cap, mds_cap_str, osd_cap_str, authorize=False)
+    if not caps_list:
+        mgr.mon_command(
+            {
+                'prefix': 'auth rm',
+                'entity': client_entity
+            })
+    else:
+        mgr.mon_command(
+            {
+                "prefix": "auth caps",
+                'entity': client_entity,
+                'caps': caps_list
+            })