pure-ftpd 在 TLS 模式下為被動連接提供錯誤的 ip

我正在設置我們的 ftp 伺服器 ( pure-ftpd-1.0.21-r1 ) 以使用 TLS/SSL。它在我不使用 TLS 時有效。

從命令選項開始：

-S 21 -c 30 -C 10 -B -k 90% -A -R -Z -p 49152:65534 -U 013 -s --tls=1

.

Response:   230 OK. Current restricted directory is /
Command:    SYST
Response:   215 UNIX Type: L8
Command:    FEAT
Response:   211-Extensions supported:
Response:    EPRT
Response:    IDLE
Response:    MDTM
Response:    SIZE
Response:    REST STREAM
Response:    MLST type*;size*;sizd*;modify*;UNIX.mode*;UNIX.uid*;UNIX.gid*;unique*;
Response:    MLSD
Response:    TVFS
Response:    ESTP
Response:    PASV
Response:    EPSV
Response:    SPSV
Response:    ESTA
Response:    AUTH TLS
Response:    PBSZ
Response:    PROT
Response:   211 End.
Status: Connected
Status: Retrieving directory listing...
Command:    PWD
Response:   257 "/" is your current location
Command:    TYPE I
Response:   200 TYPE is now 8-bit binary
Command:    PASV
Response:   227 Entering Passive Mode (76,65,xxx,xxx,228,146) #last octets removed to protect the guilty
Command:    MLSD
Response:   150 Accepted data connection
Response:   226-ASCII
Response:   226-Options: -l 
Response:   226 54 matches total
Status: Directory listing successful
Status: Disconnected from server

當我使用 TLS 時：

Response:   220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
Response:   220-You are user number 4 of 30 allowed.
Response:   220-Local time is now 09:19. Server port: 21.
Response:   220-IPv6 connections are also welcome on this server.
Response:   220 You will be disconnected after 15 minutes of inactivity.
Command:    AUTH TLS
Response:   234 AUTH TLS OK.
Status: Initializing TLS...
Status: Verifying certificate...
Command:    USER john
Status: TLS/SSL connection established.
Response:   331 User john OK. Password required
Command:    PASS ********
Response:   230-User john has group access to:  svn      anonymou proftpd  powercor john    
Response:   230- users    usb      ftp
Response:   230 OK. Current restricted directory is /
Command:    SYST
#....same as above
Response:   200 TYPE is now 8-bit binary
Command:    PASV
Response:   227 Entering Passive Mode (192,168,15,2,198,194)
Status: Server sent passive reply with unroutable address. Using server address instead.
Command:    MLSD
Error:  Connection timed out
Error:  Failed to retrieve directory listing

我的猜測是您的 FTP 伺服器位於 NAT 防火牆後面，並且您在防火牆設備上執行了 ip_conntrack_ftp 輔助模組（或等效模組）。基本上，該模組掃描數據流以查找內部 IP 地址的實例，並將它們重寫為外部 IP 地址。但是，它不能對受 TLS 保護的 FTP 連接執行此操作，因為它無法解密飛行中的數據包以找到 IP 地址（通常被認為是一件好事）。

您的選擇是：

• 使用-P選項“強制指定 IP 地址以回复 PASV/EPSV/SPSV 命令”。
• 擺脫 NAT

引用自：https://serverfault.com/questions/78680