Werk #7476: Allow shell interpreted characters in agent encryption phrase

Component	Setup
Title	Allow shell interpreted characters in agent encryption phrase
Date	May 6, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p17 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p39 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Perviously the passphrase was not properly escaped, such that characters with special meaning to the shell lead to unencrypted agent data.

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