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Services, Directories, and Applications
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Apache has a simple user authentication system available, which is similar to the Solaris password database (/etc/passwd) in that it uses encrypted passwords, but it does not use the Solaris password database. This means that a separate list of users and passwords must be maintained. Thus, when a password-protected page is requested by a user, the user must enter a username and matching password into a dialog box. By using the appropriate modules, a connection to LDAP or some other directory can be made. Any directory that appears underneath the main htdocs directory can be password protected using this mechanism. Next, the various MIME types that can be processed by the server are defined, in a separate file called mime.types. The following are some examples of the MIME types defined for the server:
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application/mac-binhex40 application/msword application/x-csh hqx doc csh
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You can see the file types defined here for many popular applications, including compression utilities (Macintosh BinHex, application/mac-binhex40, with the extension .hqx), word processing documents (Microsoft Word, application/msword, with the extension .doc), and C shell scripts (application/x-csh, with the extension .csh). The next section deals with logfile formats, as shown here:
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HostnameLookups Off ErrorLog /opt/apache1.3.9/logs/error.log LogLevel warn LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %b" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent CustomLog /opt/apache1.3.9/logs/access.log common CustomLog /opt/apache1.3.9/logs/access.log combined
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The first directive switches off hostname lookups on clients before logging their activity. Since performing a reverse DNS lookup on every client making a connection is a CPU- and bandwidth-intensive task, many sites prefer to switch it off. However, if you need to gather marketing statistics on where your clients are connecting from (e.g., by geographical region or by second-level domain type), then you may need to switch hostname lookups on. In addition, an error log is specified as a separate entity to the access log. A typical set of access log entries looks like this:
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192.64.32.12 - - [06/Jan/2002:20:55:36 +1000] "GET /cgi-bin/printenv HTTP/1.1" 200 1024 192.64.32.12 - - [06/Jan/2002:20:56:07 +1000] "GET /cgi-bin/Search.cgi term=solaris&type=simple HTTP/1.1" 200 85527 192.64.32.12 - - [06/Jan/2002:20:58:44 +1000]
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"GET /index.html HTTP/1.1" 200 94151 192.64.32.12 - - [06/Jan/2002:20:59:58 +1000] "GET /pdf/secret.pdf HTTP/1.1" 403 29
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The first example shows that the client 192.64.32.12 accessed the CGI application printenv on January 6, 2002, at 8:55 P.M. The result code for the transaction is 200, which indicates a successful transfer. The printenv script comes standard with Apache, and displays the current environment variables being passed from the client. The output is very useful for debugging, and looks like this:
DOCUMENT_ROOT="/usr/local/apache-1.3.9.12/htdocs" GATEWAY_INTERFACE="CGI/1.1" HTTP_ACCEPT="image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/msword, application/vnd.ms-powerpoint, */*" HTTP_ACCEPT_ENCODING="gzip, deflate" HTTP_ACCEPT_LANGUAGE="en-au" HTTP_CONNECTION="Keep-Alive" HTTP_HOST="www" HTTP_USER_AGENT="Mozilla/4.75 (X11; I; SunOS 5.10 i86pc; Nav)" PATH="/usr/sbin:/usr/bin:/bin:/usr/ucb:/usr/local/bin: /usr/openwin/bin:/usr/dt/bin:/usr/ccs/bin" QUERY_STRING="" REMOTE_ADDR="209.67.50.55" REMOTE_PORT="3399" REQUEST_METHOD="GET" REQUEST_URI="/cgi-bin/printenv" SCRIPT_FILENAME="/usr/local/apache/cgi-bin/printenv" SCRIPT_NAME="/cgi-bin/printenv" SERVER_ADDR="209.67.50.203" SERVER_ADMIN="paul@paulwatters.com" SERVER_NAME="www.paulwatters.com" SERVER_PORT="80" SERVER_PROTOCOL="HTTP/1.1" SERVER_SIGNATURE="Apache/1.3.9.12 Server at www.paulwatters.com Port 80\n" SERVER_SOFTWARE="Apache/1.3.9.12 (Unix)" TZ="Australia/NSW"
The second example from the log shows that a client running from the same system successfully executed the CGI program search.cgi, passing two GET parameters: a search term of solaris and a search type of simple. The size of the generated response page was 85,527 bytes. The third example shows a plain HTML page being successfully retrieved, with a response code of 200 and a file size of 94,151 bytes. The fourth example demonstrates one of the many HTTP error codes being returned, instead of the 200 success code. In this case, a request to retrieve the file /pdf/secret.pdf is denied with a 403 code being returned to the browser. This code would be returned if the file permissions set on the /pdf/secret.pdf file did not grant read access to the user executing Apache (e.g., nobody).
Part VI:
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