hi,all

    i have log like this

Nov 6 15:23:43 web001 su: pam_unix(su:session): session opened for user bot 
by robert(uid=0)


and code like this


<decoder name="pam">
<program_name></program_name>
<prematch>^pam_unix|^\(pam_unix\)</prematch>
</decoder>

<decoder name="pam-user">
<parent>pam</parent>
<prematch>^session \w+</prematch>
<regex offset="after_prematch">\.* for user (\S+)</regex>
<order>user</order>
</decoder>


but logtest see


**Phase 1: Completed pre-decoding. 
full event: 'Nov 6 15:23:43 web001 su: pam_unix(su:session): session opened 
for user bot by robert(uid=0)' 
hostname: 'web001' 
program_name: 'su' 
log: 'pam_unix(su:session): session opened for user bot by robert(uid=0)' 

**Phase 2: Completed decoding. 
decoder: 'pam' 

**Rule debugging: 
Trying rule: 1 - Generic template for all syslog rules. 
*Rule 1 matched. 
*Trying child rules. 
Trying rule: 5500 - Grouping of the pam_unix rules. 
*Rule 5500 matched. 
*Trying child rules. 
Trying rule: 5552 - PAM and gdm are not playing nicely. 
Trying rule: 5503 - User login failed. 
Trying rule: 5504 - Attempt to login with an invalid user. 
Trying rule: 5501 - Login session opened. 
*Rule 5501 matched. 
*Trying child rules. 
Trying rule: 5521 - Ignoring Annoying Ubuntu/debian cron login events. 
Trying rule: 40101 - System user successfully logged to the system. 
Trying rule: 40112 - Multiple authentication failures followed by a 
success. 
Trying rule: 101008 - User successfully changed UID (su command). 
*Rule 101008 matched. 
*Trying child rules. 
Trying rule: 101009 - User successfully changed UID (su command) to Public 
user. 

**Phase 3: Completed filtering (rules). 
Rule id: '101008' 
Level: '8' 
Description: 'User successfully changed UID (su command).' 
**Alert to be generated. 




why child decoder can not work? why not match user?

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