[taler-docs] 02/02: mention socket perms and same-group requirement

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commit be4b567666c0f05a68be01ec20b2e81212a32a2f
Author: Thien-Thi Nguyen <ttn@gnuvola.org>
AuthorDate: Mon Jan 11 00:24:30 2021 -0500

    mention socket perms and same-group requirement
    
    This reflects the result of an email discussion between FD and CG.
---
 taler-exchange-manual.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/taler-exchange-manual.rst b/taler-exchange-manual.rst
index 2d47671..79a3bdf 100644
--- a/taler-exchange-manual.rst
+++ b/taler-exchange-manual.rst
@@ -234,6 +234,9 @@ integration support.
 Functionality
 ^^^^^^^^^^^^^
 
+The UNIX domain sockets have mode 0620 (u+rw, g+w).  The exchange process
+MUST be in the same group as the the crypto helper processes.
+
 The two helper processes will create the required private keys, and allow
 anyone with access to the UNIX domain socket to sign arbitrary messages with
 the keys or to inform them about a key being revoked.  The helper processes

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