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Added section on server-supplied names to security considerations

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Dan Fandrich 2010-10-12 11:22:18 -07:00
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docs/libcurl/libcurl-tutorial.3
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@ -1237,6 +1237,15 @@ are used to generate structured data. Characters like embedded carriage
returns or ampersands could allow the user to create additional headers or
fields that could cause malicious transactions.
.IP "Server-supplied Names"
A server can supply data which the application may, in some cases, use as
a file name. The curl command-line tool does this with --remote-header-name,
using the Content-disposition: header to generate a file name. An application
could also use CURLINFO_EFFECTIVE_URL to generate a file name from a
server-supplied redirect URL. Special care must be taken to sanitize such
names to avoid the possibility of a malicious server supplying one like
"/etc/passwd", "\autoexec.bat" or even ".bashrc".
.IP "Server Certificates"
A secure application should never use the CURLOPT_SSL_VERIFYPEER option to
disable certificate validation. There are numerous attacks that are enabled