Easy to reproduce with proftpd and this config inside the default anonymous
section:
<Limit EPSV PASV>
DenyAll
</Limit>
Proftpd's extended log shows squid trying passive mode and getting back a 501:
trusty-squid-passive-ftp-1560429.lxd UNKNOWN - [04/Jul/2017:19:35:24 +0000]
"USER anonymous" 331 -
trusty-squid-passive-ftp-1560429.lxd UNKNOWN ftp [04/Jul/2017:19:35:24 +0000]
"PASS (hidden)" 230 -
trusty-squid-passive-ftp-1560429.lxd UNKNOWN ftp [04/Jul/2017:19:35:24 +0000]
"TYPE A" 200 -
trusty-squid-passive-ftp-1560429.lxd UNKNOWN ftp [04/Jul/2017:19:35:24 +0000]
"MDTM readme.txt" 213 -
trusty-squid-passive-ftp-1560429.lxd UNKNOWN ftp [04/Jul/2017:19:35:24 +0000]
"EPSV 1" 501 -
trusty-squid-passive-ftp-1560429.lxd UNKNOWN ftp [04/Jul/2017:19:35:24 +0000]
"PASV" 501 -
Which squid doesn't like and crashes:
Program received signal SIGSEGV, Segmentation fault.
Ip::Address::GetPort (this=0x8) at Address.cc:806
806 Address.cc: No such file or directory.
(gdb) bt
#0 Ip::Address::GetPort (this=0x8) at Address.cc:806
#1 0x0000559917ef0d68 in ftpSendEPRT (ftpState=ftpState@entry=0x5599192f9198)
at ftp.cc:2925
I'll try the bzr commit diff from the upstream squid bug.
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https://bugs.launchpad.net/bugs/1560429
Title:
squid3: segfault when ftp passive mode is not available
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