docs: Update the redirect protocols disabled by default

- Clarify that FILE and SCP are disabled by default since 7.19.4
- Add that SMB and SMBS are disabled by default since 7.40.0
- Add CURLPROTO_SMBS to the list of protocols
This commit is contained in:
Jay Satiro 2015-08-18 01:18:27 -04:00
parent 9518139c73
commit 1f1f131e09
5 changed files with 36 additions and 12 deletions

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@ -1313,8 +1313,20 @@ as concatenating the protocols into one instance of the option.
(Added in 7.20.2)
.IP "--proto-redir <protocols>"
Tells curl to use the listed protocols after a redirect. See --proto for
how protocols are represented.
Tells curl to use the listed protocols on redirect. See --proto for how
protocols are represented.
Example:
.RS
.IP "--proto-redir -all,http,https"
Allow only HTTP and HTTPS on redirect.
.RE
By default curl will allow all protocols on redirect except several disabled
for security reasons: Since 7.19.4 FILE and SCP are disabled, and since 7.40.0
SMB and SMBS are also disabled. Specifying \fIall\fP or \fI+all\fP enables all
protocols on redirect, including those disabled for security.
(Added in 7.20.2)
.IP "--proxy-anyauth"

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@ -1086,11 +1086,15 @@ NTLM authentication, HTTPS, FTPS, SCP and SFTP are a few examples.
.IP "Redirects"
The \fICURLOPT_FOLLOWLOCATION(3)\fP option automatically follows HTTP
redirects sent by a remote server. These redirects can refer to any kind of
URL, not just HTTP. A redirect to a file: URL would cause the libcurl to read
(or write) arbitrary files from the local filesystem. If the application
returns the data back to the user (as would happen in some kinds of CGI
scripts), an attacker could leverage this to read otherwise forbidden data
(e.g. file://localhost/etc/passwd).
URL, not just HTTP. By default libcurl will allow all protocols on redirect
except several disabled for security reasons: Since 7.19.4 FILE and SCP are
disabled, and since 7.40.0 SMB and SMBS are also disabled.
A redirect to a file: URL would cause the libcurl to read (or write) arbitrary
files from the local filesystem. If the application returns the data back to
the user (as would happen in some kinds of CGI scripts), an attacker could
leverage this to read otherwise forbidden data (e.g.
file://localhost/etc/passwd).
If authentication credentials are stored in the ~/.netrc file, or Kerberos
is in use, any other URL type (not just file:) that requires

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@ -37,8 +37,10 @@ returned. \fICURLOPT_MAXREDIRS(3)\fP can be used to limit the number of
redirects libcurl will follow.
libcurl can limit to what protocols it will automatically follow. The accepted
protocols are set with \fICURLOPT_REDIR_PROTOCOLS(3)\fP and it excludes the
FILE protocol by default.
protocols are set with \fICURLOPT_REDIR_PROTOCOLS(3)\fP. By default libcurl
will allow all protocols on redirect except several disabled for security
reasons: Since 7.19.4 FILE and SCP are disabled, and since 7.40.0 SMB and SMBS
are also disabled.
For users who think the existing location following is too naive, too simple
or just lacks features, it is very easy to instead implement your own redirect

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@ -60,6 +60,7 @@ CURLPROTO_RTSP
CURLPROTO_SCP
CURLPROTO_SFTP
CURLPROTO_SMB
CURLPROTO_SMBS
CURLPROTO_SMTP
CURLPROTO_SMTPS
CURLPROTO_TELNET

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@ -32,8 +32,12 @@ Pass a long that holds a bitmask of CURLPROTO_* defines. If used, this bitmask
limits what protocols libcurl may use in a transfer that it follows to in a
redirect when \fICURLOPT_FOLLOWLOCATION(3)\fP is enabled. This allows you to
limit specific transfers to only be allowed to use a subset of protocols in
redirections. By default libcurl will allow all protocols except for FILE and
SCP.
redirections.
By default libcurl will allow all protocols on redirect except several disabled
for security reasons: Since 7.19.4 FILE and SCP are disabled, and since 7.40.0
SMB and SMBS are also disabled. \fICURLPROTO_ALL\fP enables all protocols on
redirect, including those disabled for security.
These are the available protocol defines:
.nf
@ -60,13 +64,14 @@ CURLPROTO_RTSP
CURLPROTO_SCP
CURLPROTO_SFTP
CURLPROTO_SMB
CURLPROTO_SMBS
CURLPROTO_SMTP
CURLPROTO_SMTPS
CURLPROTO_TELNET
CURLPROTO_TFTP
.fi
.SH DEFAULT
All protocols except for FILE, SCP and SMB.
All protocols except for FILE, SCP and since 7.40.0 SMB and SMBS.
.SH PROTOCOLS
All
.SH EXAMPLE