Bugs item #1600668, was opened at 2006-11-21 11:49
Message generated for change (Comment added) made by nobody
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Category: ftp
Group: wrong behaviour
Status: Closed
Resolution: Invalid
Priority: 5
Private: No
Submitted By: Alan Pinstein (apinstein)
Assigned to: Daniel Stenberg (bagder)
Summary: Download permissions problem.

Initial Comment:
Detailed Summary: CURL can't fetch a file unless it has permissions for *all* folders leading up to a file. This prevents the use of curl to download files that you have permissions to be downloaded.

I ran into a wierd problem... I was able to dl an ftp file with wget, but not curl. Further investigation showed that curl tries to "get to the file" differently from wget.

Suppose you access an ftp server with a file at /noperm/perm/thefile.zip.

You *can* log in, cd /noperm/perm, then get thefile.zip. However, curl cd's one dir at a time. And since you are not allowed in /noperm, the download fails.

Here's some tcpflow sniffs to illustrate trying to get:

ftp://idx.living.net/idx_fl_ftp_down/idx_miamidade_dn/miamidade_photo.zip

(you don't have permission to try this, but I posted the URL so that the tcpflows make sense)

-- curl, download failed --
065.117.180.017.00021-010.000.001.104.62958: 230 Login OK. Proceed.

010.000.001.104.62958-065.117.180.017.00021: PWD

065.117.180.017.00021-010.000.001.104.62958: 257 "/" is current folder.

010.000.001.104.62958-065.117.180.017.00021: CWD idx_fl_ftp_down

065.117.180.017.00021-010.000.001.104.62958: 550 Permission denied.

010.000.001.104.62958-065.117.180.017.00021: QUIT

065.117.180.017.00021-010.000.001.104.62958: 221 Exit message.

-- by-hand ftp, success --
065.117.180.017.00021-010.000.001.104.62963: 230 Login OK. Proceed.

010.000.001.104.62963-065.117.180.017.00021: SYST

065.117.180.017.00021-010.000.001.104.62963: 215 UNIX Type: L8

010.000.001.104.62963-065.117.180.017.00021: FEAT

065.117.180.017.00021-010.000.001.104.62963: 211-Features supported:
 COMB target;source_list
 REST STREAM
 SIZE
 MDTM
 XCRC filename;start;end
 SSCN
 MLST Size*;Modify*;Create;Type*;Unique;Perm*;Lang;Media-Type;CharSet;
 MODE Z
211 END

010.000.001.104.62963-065.117.180.017.00021: PWD

065.117.180.017.00021-010.000.001.104.62963: 257 "/" is current folder.

010.000.001.104.62963-065.117.180.017.00021: CWD idx_fl_ftp_down

065.117.180.017.00021-010.000.001.104.62963: 550 Permission denied.

010.000.001.104.62963-065.117.180.017.00021: CWD idx_fl_ftp_down/idx_miamidade_dn

065.117.180.017.00021-010.000.001.104.62963: 250 Folder changed to "/idx_fl_ftp_down/idx_miamidade_dn".

010.000.001.104.62963-065.117.180.017.00021: PWD

065.117.180.017.00021-010.000.001.104.62963: 257 "/idx_fl_ftp_down/idx_miamidade_dn" is current folder.

010.000.001.104.62963-065.117.180.017.00021: QUIT

065.117.180.017.00021-010.000.001.104.62963: 221 Exit message.

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Comment By: Nobody/Anonymous (nobody)
Date: 2006-11-21 21:18

Message:
Logged In: NO

(I'll take this to the curl-and-php mailing list)

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Comment By: Nobody/Anonymous (nobody)
Date: 2006-11-21 20:12

Message:
Logged In: NO

Ok, thanks, I'll check that out. I actually did look for an option that
would affect the "cd" behavior before posting the bug, but couldn't find
it. The --ftp-method looks perfect.

Do you happen to know how to access this via curl_setopt from php since
there is no defined constant for FTP_METHOD?

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Comment By: Daniel Stenberg (bagder)
Date: 2006-11-21 13:28

Message:
Logged In: YES
user_id=1110
Originator: NO

What Dan said. Case closed.

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Comment By: Dan Fandrich (dfandrich)
Date: 2006-11-21 12:41

Message:
Logged In: YES
user_id=236775
Originator: NO

This is a server problem, not a curl problem--curl is RFC compliant in its
accessing of ftp resources. Recent versions of curl support the
--ftp-method option which can be used to force curl to issue CWD commands
in an RFC-incompliant manner and make it act like wget in this regard.

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Received on 2006-11-22