The branch, v3-3-test has been updated via b77c46a36366d25dcdbc476963fbf43aaa4b9801 (commit) via 0865f4615d3ee91673dd6d02c6537765f34b3129 (commit) from bf3c2773f94c1db29a8a3e5935ff587f16f9a905 (commit)
http://gitweb.samba.org/?p=samba.git;a=shortlog;h=v3-3-test - Log ----------------------------------------------------------------- commit b77c46a36366d25dcdbc476963fbf43aaa4b9801 Author: Gerald (Jerry) Carter <[EMAIL PROTECTED]> Date: Tue May 27 12:02:27 2008 -0500 Adding initial copy of "Using Samba (3rd ed)" commit 0865f4615d3ee91673dd6d02c6537765f34b3129 Author: Gerald (Jerry) Carter <[EMAIL PROTECTED]> Date: Tue May 27 12:00:00 2008 -0500 Add simple script to build docs ----------------------------------------------------------------------- Summary of changes: docs-xml/using_samba/appa.xml | 1147 +++++++++++ docs-xml/using_samba/appb.xml | 1702 ++++++++++++++++ docs-xml/using_samba/appc.xml | 3337 ++++++++++++++++++++++++++++++++ docs-xml/using_samba/appd.xml | 1615 +++++++++++++++ docs-xml/using_samba/appe.xml | 46 + docs-xml/using_samba/appf.xml | 250 +++ docs-xml/using_samba/book.html | 2924 ++++++++++++++++++++++++++++ docs-xml/using_samba/book.xml | 51 + 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Samba</primary><secondary sortas="SSL">with SSL</secondary></indexterm> +<indexterm id="appa-idx-990325-1" class="startofrange"><primary>SSL (Secure Sockets Layer) protocol</primary><secondary>configuring Samba with</secondary></indexterm>This appendix describes how to set up Samba to use secure connections between the Samba server and its clients. The protocol used here is Netscape's Secure Sockets Layer (SSL). For this example, we will establish a secure connection between a Samba server and a Windows NT workstation.</para> + + +<para>Before we begin, we will assume that you are familiar with the fundamentals of public-key cryptography and X.509 certificates. If not, we highly recommend Bruce Schneier's <filename>Applied Cryptography, 2nd Edition</filename> (Wiley) as the premiere source for learning the many secret faces of cryptography.</para> + + +<tip role="ora"> +<para>If you would like more information on Samba and SSL, be sure to look at the document <filename>SSLeay.txt</filename> in the <filename>docs/textdocs</filename> directory of the Samba distribution, which is the basis for this appendix.</para> + +</tip> + + + + + + + + + + + +<sect1 role="" label="A.1" id="appa-SECT-1"> +<title>About Certificates</title> + + +<para>Here are a few quick questions and answers from the <filename>SSLeay.txt</filename> file in the Samba documentation, regarding the benefits of SSL and certificates. This text was written by Christian Starkjohann for the Samba projects.</para> + + +<sect2 role="" label="A.1.1" id="appa-SECT-1.1"> +<title>What is a Certificate?</title> + + +<para>A certificate is issued by an issuer, usually a <emphasis>Certification Authority</emphasis> (CA), who confirms something by issuing the certificate. The subject of this confirmation depends on the CA's policy. CAs for secure web servers (used for shopping malls, etc.) usually attest only that the given public key belongs the given domain name. Company-wide CAs might attest that you are an employee of the company, that you have permissions to use a server, and so on.</para> +</sect2> + + + + + +<sect2 role="" label="A.1.2" id="appa-SECT-1.2"> +<title>What is an X.509 certificate, technically?</title> + + +<para>Technically, the certificate is a block of data signed by the certificate issuer (the CA). The relevant fields are:</para> + + +<itemizedlist> + +<listitem><para> +Unique identifier (name) of the certificate issuer</para></listitem> + +<listitem><para>Time range during which the certificate is valid</para></listitem> + +<listitem><para>Unique identifier (name) of the certified object</para></listitem> + +<listitem><para>Public key of the certified object</para></listitem> + +<listitem><para>The issuer's signature over all the above</para></listitem> + +</itemizedlist> + +<para>If this certificate is to be verified, the verifier must have a table of the names and public keys of trusted CAs. For simplicity, these tables should list certificates issued by the respective CAs for themselves (self-signed certificates).</para> +</sect2> + + + + + +<sect2 role="" label="A.1.3" id="appa-SECT-1.3"> +<title>What are the implications of this certificate structure?</title> + + +<para>Four implications follow:</para> + + +<itemizedlist> + +<listitem><para>Because the certificate contains the subjects's public key, the certificate and the private key together are all that is needed to encrypt and decrypt.</para></listitem> + +<listitem><para>To verify certificates, you need the certificates of all CAs you trust.</para></listitem> + +<listitem><para>The simplest form of a dummy-certificate is one that is signed by the subject.</para></listitem> + +<listitem><para>A CA is needed. The client can't simply issue local certificates for servers it trusts because the server determines which certificate it presents.</para></listitem> + +</itemizedlist> +</sect2> +</sect1> + + + + + + + + + +<sect1 role="" label="A.2" id="appa-SECT-2"> +<title>Requirements</title> + + +<para> +<indexterm id="appa-idx-990348-0"><primary>configuring Samba</primary><secondary sortas="SSL">with SSL</secondary><tertiary>requirements for</tertiary></indexterm> +<indexterm id="appa-idx-990348-1"><primary>SSL (Secure Sockets Layer) protocol</primary><secondary>configuring Samba with</secondary><tertiary>requirements for</tertiary></indexterm>To set up SSL connections, you will need to download two programs in addition to Samba:</para> + + +<variablelist> +<varlistentry><term> +<indexterm id="appa-idx-990613-0" class="startofrange"><primary>SSL (Secure Sockets Layer) protocol</primary><secondary>SSLeay</secondary></indexterm>SSLeay</term> +<listitem><para>Eric <indexterm id="appa-idx-990362-0"><primary>Young, Eric</primary></indexterm>Young's implementation of the Secure Socket's Layer (SSL) protocol as a series of Unix programming libraries</para></listitem> +</varlistentry> + + +<varlistentry><term> +<indexterm id="appa-idx-990357-0"><primary>SSL (Secure Sockets Layer) protocol</primary><secondary>SS Proxy</secondary></indexterm>SSL Proxy</term> +<listitem><para>A freeware SSL application from Objective Development, which can be used to proxy a secure link on Unix or Windows NT platforms</para></listitem> +</varlistentry> +</variablelist> + + +<para>These two products assist with the server and client side of the encrypted SSL connection. The SSLeay libraries are compiled and installed directly on the Unix system. SSL Proxy, on the other hand, can be downloaded and compiled (or downloaded in binary format) and located on the client side. If you intend to have a Windows NT client or a Samba client on the other end of the SSL connection, you will not require a special setup.</para> + + +<para>SSL Proxy, however, does not work on Windows 95/98 machines. Therefore, if you want to have a secure connection between a Samba server and Windows 95/98 client, you will need to place either a Unix server or a Windows NT machine on the same subnet with the Windows 9<emphasis>x</emphasis> clients and route all network connections through the SSL-Proxy-enabled machine. See <link linkend="appa-89929">Figure 1.1</link>.</para> + + +<figure label="A.1" id="appa-89929"> +<title>Two possible ways of proxying Windows 95/98 clients</title> + +<graphic width="502" depth="317" fileref="figs/sam.aa01.gif"></graphic> +</figure> + +<para>For the purposes of this chapter, we will create a simple SSL connection between the Samba server and a Windows NT client. This configuration can be used to set up more complex networks at the administrator's discretion.</para> +</sect1> + + + + + + + + + +<sect1 role="" label="A.3" id="appa-SECT-3"> +<title>Installing SSLeay</title> + + +<para>Samba uses the SSLeay package, written by Eric Young, to provide Secure Sockets Layer support on the server side. Because of U.S. export law, however, the SSLeay package cannot be shipped with Samba distributions that are based in the United States. For that reason, the Samba creators decided to leave it as a separate package entirely. You can download the SSLeay distribution from any of the following sites:</para> + + +<itemizedlist> + +<listitem><para><systemitem role="ftpurl">ftp://ftp.psy.uq.oz.au/pub/Crypto/SSL/</systemitem></para></listitem> + +<listitem><para><systemitem role="ftpurl">ftp://ftp.uni-mainz.de/pub/internet/security/ssl</systemitem></para></listitem> + +<listitem><para><systemitem role="ftpurl">ftp://ftp.cert.dfn.de/pub/tools/crypt/sslapps</systemitem></para></listitem> + +<listitem><para><systemitem role="ftpurl">ftp://ftp.funet.fi/pub/crypt/mirrors/ftp.psy.uq.oz.au</systemitem></para></listitem> + +<listitem><para><systemitem role="ftpurl">ftp://ftp.sunet.se/ftp/pub/security/tools/crypt/ssleay</systemitem></para></listitem> + +</itemizedlist> + +<para>The latest version as of this printing is 0.9.0b. Download it to the same server as the Samba distribution, then uncompress and untar it. You should be left with a directory entitled <filename>SSLeay-0.9.0b</filename>. After changing to that directory, you will need to configure and build the SSL encryption package in the same way that you did with Samba.</para> + + +<para>SSLeay uses a Perl-based <filename>configure</filename> script. This script modifies the Makefile that constructs the utilities and libraries of the SSLeay package. However, the default script is hardcoded to find Perl at <filename>/usr/local/bin/perl</filename>. You may need to change the <filename>configure</filename> script to point to the location of the Perl executable file on your Unix system. For example, you can type the following to locate the Perl executable:</para> + + +<programlisting># <userinput>which perl</userinput> +/usr/bin/perl</programlisting> + + +<para>Then modify the first line of the <filename>configure</filename> script to force it to use the correct Perl executable. For example, on our Red Hat Linux system:</para> + + +<programlisting>#!/usr/bin/perl +# +# see PROBLEMS for instructions on what sort of things to do +# when tracking a bug -tjh +...</programlisting> + + +<para>After that, you need to run the <filename>configure</filename> script by specifying a target platform for the distribution. This target platform can be any of the following:</para> + + +<programlisting>BC-16 BC-32 FreeBSD NetBSD-m86 +NetBSD-sparc NetBSD-x86 SINIX-N VC-MSDOS +VC-NT VC-W31-16 VC-W31-32 VC-WIN16 +VC-WIN32 aix-cc aix-gcc alpha-cc +alpha-gcc alpha400-cc cc cray-t90-cc +debug debug-irix-cc debug-linux-elf dgux-R3-gcc +dgux-R4-gcc dgux-R4-x86-gcc dist gcc +hpux-cc hpux-gcc hpux-kr-cc irix-cc +irix-gcc linux-aout linux-elf ncr-scde +nextstep purify sco5-cc solaris-sparc-cc +solaris-sparc-gcc solaris-sparc-sc4 solaris-usparc-sc4 solaris-x86-gcc +sunos-cc sunos-gcc unixware-2.0 unixware</programlisting> + + +<para>For our system, we would enter the following:</para> + + +<programlisting># <userinput>./Configure linux-elf</userinput> +CC =gcc +CFLAG =-DL_ENDIAN -DTERMIO -DBN_ASM -O3 -fomit-frame-pointer +EX_LIBS = +BN_MULW =asm/bn86-elf.o +DES_ENC =asm/dx86-elf.o asm/yx86-elf.o +BF_ENC =asm/bx86-elf.o +CAST_ENC =asm/cx86-elf.o +RC4_ENC =asm/rx86-elf.o +RC5_ENC =asm/r586-elf.o +MD5_OBJ_ASM =asm/mx86-elf.o +SHA1_OBJ_ASM =asm/sx86-elf.o +RMD160_OBJ_ASM=asm/rm86-elf.o +THIRTY_TWO_BIT mode +DES_PTR used +DES_RISC1 used +DES_UNROLL used +BN_LLONG mode +RC4_INDEX mode</programlisting> + + +<para>After the package has been configured, you can build it by typing <literal>make</literal>. If the build did not successfully complete, consult the documentation that comes with the distribution or the FAQ at <systemitem role="url">http://www.cryptsoft.com/ssleay/</systemitem> for more information on what may have happened. If the build did complete, type <literal>make</literal> <literal>install</literal> to install the libraries on the system. Note that the makefile installs the package in <filename>/usr/local/ssl</filename> by default. If you decide to install it in another directory, remember the directory when configuring Samba to use SSL.</para> + + +<sect2 role="" label="A.3.1" id="appa-SECT-3.1"> +<title>Configuring SSLeay for Your System</title> + + +<para>The first thing you need to do is to set the <literal>PATH</literal> environment variable on your system to include the <filename>/bin</filename> directory of the SSL distribution. This can be done with the following statement:</para> + + +<programlisting>PATH=$PATH:/usr/local/ssl/bin</programlisting> + + +<para>That's the easy part. Following that, you will need to create a random series of characters that will be used to prime SSLeay's random number generator. The random number generator will be used to create key pairs for both the clients and the server. You can create this random series by filling a text file of a long series of random characters. For example, you can use your favorite editor to create a text file with random characters, or use this command and enter arbitrary characters at the standard input:</para> + + +<programlisting>cat >/tmp/private.txt</programlisting> + + +<para>The Samba documentation recommends that you type characters for longer than a minute before interrupting the input stream by hitting Control-D. Try not to type only the characters that are under your fingers on the keyboard; throw in some symbols and numbers as well. Once you've completed the random file, you can prime the random number generator with the following command:</para> + + +<programlisting># ssleay genrsa -rand /tmp/private.txt >/dev/null +2451 semi-random bytes loaded +Generating RSA private key, 512 bit long modulus +..+++++ +.................................+++++ +e is 65537 (0x10001)</programlisting> + + +<para>You can safely ignore the output of this command. After it has completed, remove the series of characters used to create the key because this could be used to recreate any private keys that were generated from this random number generator:</para> + + +<programlisting>rm -f /tmp/private.txt</programlisting> + + +<para>The result of this command is the hidden file .<emphasis>rnd</emphasis>, which is stored in your home directory. SSLeay will use this file when creating key pairs in the future.</para> +</sect2> + + + + + +<sect2 role="" label="A.3.2" id="appa-SECT-3.2"> +<title>Configuring Samba to use SSL</title> + + +<para> +<indexterm id="appa-idx-990398-0"><primary>SSL (Secure Sockets Layer) protocol</primary><secondary>configuring Samba to use</secondary></indexterm>At this point, you can compile Samba to use SSL. Recall that in <link linkend="SAMBA-CH-2">Chapter 2</link>, we said you have to first run the configure script, which initializes the makefile, before you compile Samba. In order to use SSL with Samba, you will need to reconfigure the makefile:</para> + + +<programlisting>./configure --with-ssl</programlisting> + + +<para>After that, you can compile Samba with the following commands:</para> + + +<programlisting># <userinput>make clean</userinput> +# <userinput>make all</userinput></programlisting> + + +<para>If you encounter an error that says the <filename>smbd</filename> executable is missing the file <filename>ssl.h</filename>, you probably didn't install SSLeay in the default directory. Use the configure option <literal>--with-sslinc</literal> to point to the base directory of the SSL distribution—in this case, the directory that contains <emphasis>include/ssl.h</emphasis>.</para> + + +<para>On the other hand, if you have a clean compile, you're ready to move on to the next step: creating certificates.</para> +</sect2> + + + + + +<sect2 role="" label="A.3.3" id="appa-62097"> +<title>Becoming a Certificate Authority</title> + + +<para><firstterm></firstterm> +<indexterm id="appa-idx-990405-0" class="startofrange"><primary>certificate authority</primary></indexterm>The SSL protocol requires the use of X.509 certificates in the protocol handshake to ensure that either one or both parties involved in the communication are indeed who they say they are. Certificates in real life, such as those use for SSL connections on public web sites, can cost in the arena of $300 a year. This is because the certificate must have a digital signature placed on it by a <firstterm>certificate authority</firstterm>. A certificate authority is an entity that vouches for the authenticity of a digital certificate by signing it with its own private key. This way, anyone who wishes to check the authenticity of the certificate can simply use the certificate authority's public key to check the signature.</para> + + +<para>You are allowed to use a public certificate authority with SSLeay. However, you don't have to. Instead, SSLeay will allow you to declare yourself a trusted certificate authority—specifying which clients you choose to trust and which clients you do not. In order to do this, you will need to perform several tasks with the SSLeay distribution.</para> + + +<para>The first thing you need to do is specify a secure location where the certificates of the clients and potentially the server will be stored. We have chosen <filename>/etc/certificates</filename> as our default. Execute the following commands as <literal>root</literal>:</para> + + +<programlisting># <userinput>cd /etc</userinput> +# <userinput>mkdir certificates</userinput> +# <userinput>chmod 700 certificates</userinput></programlisting> + + +<para>Note that we shut out all access to users other than <literal>root</literal> for this directory. This is very important.</para> + + +<para>Next, you need to set up the SSLeay scripts and configuration files to use the certificates stored in this directory. In order to do this, first modify the <filename>CA.sh</filename> script located at <emphasis>/usr/local/ssl/bin/CA.sh</emphasis> to specify the location of the directory you just created. Find the line that contains the following entry:</para> + + +<programlisting>CATOP=./demoCA</programlisting> + + +<para>Then change it to:</para> + + +<programlisting>CATOP=/etc/certificates</programlisting> + + +<para>Next, you need to modify the <emphasis>/usr/local/ssl/lib/ssleay.cnf</emphasis> file to specify the same directory. Find the entry:</para> + + +<programlisting>[ CA_default ] +dir = ./demoCA # Where everything is kept</programlisting> + + +<para>Then change it to:</para> + + +<programlisting>[ CA_default ] +dir = /etc/certificates # Where everything is kept</programlisting> + + +<para>Next, run the certificate authority setup script, <filename>CA.sh</filename>, in order to create the certificates. Be sure to do this as the same user that you used to prime the random number generator above:</para> + + +<programlisting>/usr/local/ssl/bin/CA.sh -newca +mkdir: cannot make directory '/etc/certificates': File exists +CA certificate filename (or enter to create)</programlisting> + + +<para>Press the Enter key to create a certificate for the CA. You should then see:</para> + + +<programlisting>Making CA certificate ... +Using configuration from /usr/local/ssl/lib/ssleay.cnf +Generating a 1024 bit RSA private key +.............................+++++ +.....................+++++ +writing new private key to /etc/certificates/private/cakey.pem +Enter PEM pass phrase:</programlisting> + + +<para>Enter a new pass phrase for your certificate. You will need to enter it twice correctly before SSLeay will accept it:</para> + + +<programlisting>Enter PEM pass phrase: +Verifying password - Enter PEM pass phrase:</programlisting> + + +<para>Be sure to remember this pass phrase. You will need it to sign the client certificates in the future. Once SSLeay has accepted the pass phrase, it will continue on with a series of questions for each of the fields in the X509 certificate:</para> + + +<programlisting>You are about to be asked to enter information that will be +incorporated into your certificate request. +What you are about to enter is what is called a Distinguished +Name or a DN. +There are quite a few fields but you can leave some blank +For some fields there will be a default value, +If you enter '.', the field will be left blank.</programlisting> + + +<para>Fill out the remainder of the fields with information about your organization. For example, our certificate looks like this:</para> + + +<programlisting>Country Name (2 letter code) [AU]:<userinput>US</userinput> +State or Province Name (full name) [Some-State]:<userinput>California</userinput> +Locality Name (eg, city) []:<userinput>Sebastopol</userinput> +Organization Name (eg, company) []:<userinput>O'Reilly</userinput> +Organizational Unit Name (eg, section) []:<userinput>Books</userinput> +Common Name (eg, YOUR name) []:<userinput>John Doe</userinput> +Email Address []:<userinput>[EMAIL PROTECTED]</userinput></programlisting> + + +<para>After that, SSLeay will be configured as a certificate authority and can be used to sign certificates for client machines that will be connecting to the Samba server.</para> +</sect2> + + + + + +<sect2 role="" label="A.3.4" id="appa-SECT-3.4"> +<title>Creating Certificates for Clients</title> + + +<para>It's simple to create a certificate for a client machine. First, you need to generate a public/private key pair for each entity, create a certificate request file, and then use <emphasis>SSLeay</emphasis> to sign the file as a trusted authority.</para> + + +<para>For our example client <literal>phoenix</literal>, this boils down to three SSLeay commands. The first generates a key pair for the client and places it in the file <filename>phoenix.key</filename>. The private key will be encrypted, in this case using triple DES. Enter a pass phrase when requested below—you'll need it for the next step:</para> + + +<programlisting># ssleay genrsa -des3 1024 >phoenix.key +1112 semi-random bytes loaded +Generating RSA private key, 1024 bit long modulus +........................................+++++ +.............+++++ +e is 65537 (0x10001) +Enter PEM pass phrase: +Verifying password - Enter PEM pass phrase:</programlisting> + + +<para>After that command has completed, type in the following command:</para> + + +<programlisting># <userinput>ssleay req -new -key phoenix.key -out phoenix-csr</userinput> +Enter PEM pass phrase:</programlisting> + + +<para>Enter the pass phrase for the client certificate you just created (not the certificate authority). At this point, you will need to answer the questionnaire again, this time for the client machine. In addition, you must type in a challenge password and an optional company name—those do not matter here. When the command completes, you will have a certificate request in the file <emphasis>phoenix-csr.</emphasis></para> + + +<para>Then, you must sign the certificate request as the trusted certificate authority. Type in the following command:</para> + + +<programlisting># <userinput>ssleay ca -days 1000 -inflies phoenix-csr >phoenix.pem</userinput></programlisting> + + +<para>This command will prompt you to enter the PEM pass phrase of the <emphasis>certificate authority</emphasis>. Be sure that you do not enter the PEM pass phrase of the client certificate that you just created. After entering the correct pass phrase, you should see the following:</para> + + +<programlisting>Check that the request matches the signature +Signature ok +The Subjects Distinguished Name is as follows: +...</programlisting> + + +<para>This will be followed by the information that you just entered for the client certificate. If there is an error in the fields, the program will notify you. On the other hand, if everything is fine, SSLeay will confirm that it should sign the certificate and commit it to the database. This adds a record of the certificate to the <filename>/etc/certificates/newcerts</filename> directory.</para> + + +<para>The operative files at the end of this exercise are the <emphasis>phoenix.key</emphasis> and <emphasis>phoenix.pem</emphasis> files, which reside in the current directory. These files will be passed off to the client with whom the SSL-enabled Samba server will interact, and will be used by SSL Proxy.<firstterm></firstterm> +<indexterm id="appa-idx-990421-0" class="endofrange" startref="appa-idx-990405-0"/></para> +</sect2> + + + + + +<sect2 role="" label="A.3.5" id="appa-SECT-3.5"> +<title>Configuring the Samba Server</title> + + +<para>The next step is to modify the Samba configuration file to include the following setup options. These options assume that you created the certificates directory for the certificate authority at <filename>/etc/certificates </filename>:</para> + + +<programlisting>[global] + ssl = yes + ssl server cert = /etc/certificates/cacert.pem + ssl server key = /etc/certificates/private/cakey.pem + ssl CA certDir = /etc/certificates</programlisting> + + +<para>At this point, you will need to kill the Samba daemons and restart them manually:</para> + + +<programlisting># <userinput>nmbd -D</userinput> +# <userinput>smbd -D</userinput> +Enter PEM pass phrase:</programlisting> + + +<para>You will need to enter the PEM pass phrase of the certificate authority to start up the Samba daemons. Note that this may present a problem in terms of starting the program using ordinary means. However, you can get around this using advanced scripting languages, such as Expect or Python.</para> +</sect2> + + + + -- Samba Shared Repository