347 lines
10 KiB
Plaintext
347 lines
10 KiB
Plaintext
=pod
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=head1 NAME
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ciphers - SSL cipher display and cipher list tool.
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=head1 SYNOPSIS
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B<openssl> B<ciphers>
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[B<-v>]
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[B<-ssl2>]
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[B<-ssl3>]
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[B<-tls1>]
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[B<cipherlist>]
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=head1 DESCRIPTION
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The B<cipherlist> command converts OpenSSL cipher lists into ordered
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SSL cipher preference lists. It can be used as a test tool to determine
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the appropriate cipherlist.
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=head1 COMMAND OPTIONS
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=over 4
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=item B<-v>
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verbose option. List ciphers with a complete description of
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protocol version (SSLv2 or SSLv3; the latter includes TLS), key exchange,
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authentication, encryption and mac algorithms used along with any key size
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restrictions and whether the algorithm is classed as an "export" cipher.
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Note that without the B<-v> option, ciphers may seem to appear twice
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in a cipher list; this is when similar ciphers are available for
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SSL v2 and for SSL v3/TLS v1.
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=item B<-ssl3>
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only include SSL v3 ciphers.
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=item B<-ssl2>
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only include SSL v2 ciphers.
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=item B<-tls1>
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only include TLS v1 ciphers.
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=item B<-h>, B<-?>
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print a brief usage message.
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=item B<cipherlist>
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a cipher list to convert to a cipher preference list. If it is not included
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then the default cipher list will be used. The format is described below.
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=back
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=head1 CIPHER LIST FORMAT
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The cipher list consists of one or more I<cipher strings> separated by colons.
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Commas or spaces are also acceptable separators but colons are normally used.
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The actual cipher string can take several different forms.
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It can consist of a single cipher suite such as B<RC4-SHA>.
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It can represent a list of cipher suites containing a certain algorithm, or
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cipher suites of a certain type. For example B<SHA1> represents all ciphers
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suites using the digest algorithm SHA1 and B<SSLv3> represents all SSL v3
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algorithms.
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Lists of cipher suites can be combined in a single cipher string using the
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B<+> character. This is used as a logical B<and> operation. For example
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B<SHA1+DES> represents all cipher suites containing the SHA1 B<and> the DES
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algorithms.
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Each cipher string can be optionally preceded by the characters B<!>,
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B<-> or B<+>.
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If B<!> is used then the ciphers are permanently deleted from the list.
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The ciphers deleted can never reappear in the list even if they are
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explicitly stated.
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If B<-> is used then the ciphers are deleted from the list, but some or
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all of the ciphers can be added again by later options.
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If B<+> is used then the ciphers are moved to the end of the list. This
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option doesn't add any new ciphers it just moves matching existing ones.
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If none of these characters is present then the string is just interpreted
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as a list of ciphers to be appended to the current preference list. If the
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list includes any ciphers already present they will be ignored: that is they
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will not moved to the end of the list.
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Additionally the cipher string B<@STRENGTH> can be used at any point to sort
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the current cipher list in order of encryption algorithm key length.
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=head1 CIPHER STRINGS
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The following is a list of all permitted cipher strings and their meanings.
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=over 4
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=item B<DEFAULT>
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the default cipher list. This is determined at compile time and is normally
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B<ALL:!ADH:RC4+RSA:+SSLv2:@STRENGTH>. This must be the first cipher string
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specified.
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=item B<ALL>
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all ciphers suites except the B<eNULL> ciphers which must be explicitly enabled.
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=item B<HIGH>
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"high" encryption cipher suites. This currently means those with key lengths larger
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than 128 bits.
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=item B<MEDIUM>
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"medium" encryption cipher suites, currently those using 128 bit encryption.
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=item B<LOW>
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"low" encryption cipher suites, currently those using 64 or 56 bit encryption algorithms
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but excluding export cipher suites.
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=item B<EXP>, B<EXPORT>
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export encryption algorithms. Including 40 and 56 bits algorithms.
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=item B<EXPORT40>
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40 bit export encryption algorithms
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=item B<EXPORT56>
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56 bit export encryption algorithms.
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=item B<eNULL>, B<NULL>
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the "NULL" ciphers that is those offering no encryption. Because these offer no
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encryption at all and are a security risk they are disabled unless explicitly
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included.
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=item B<aNULL>
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the cipher suites offering no authentication. This is currently the anonymous
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DH algorithms. These cipher suites are vulnerable to a "man in the middle"
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attack and so their use is normally discouraged.
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=item B<kRSA>, B<RSA>
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cipher suites using RSA key exchange.
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=item B<kEDH>
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cipher suites using ephemeral DH key agreement.
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=item B<kDHr>, B<kDHd>
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cipher suites using DH key agreement and DH certificates signed by CAs with RSA
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and DSS keys respectively. Not implemented.
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=item B<aRSA>
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cipher suites using RSA authentication, i.e. the certificates carry RSA keys.
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=item B<aDSS>, B<DSS>
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cipher suites using DSS authentication, i.e. the certificates carry DSS keys.
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=item B<aDH>
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cipher suites effectively using DH authentication, i.e. the certificates carry
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DH keys. Not implemented.
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=item B<kFZA>, B<aFZA>, B<eFZA>, B<FZA>
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ciphers suites using FORTEZZA key exchange, authentication, encryption or all
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FORTEZZA algorithms. Not implemented.
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=item B<TLSv1>, B<SSLv3>, B<SSLv2>
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TLS v1.0, SSL v3.0 or SSL v2.0 cipher suites respectively.
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=item B<DH>
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cipher suites using DH, including anonymous DH.
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=item B<ADH>
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anonymous DH cipher suites.
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=item B<3DES>
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cipher suites using triple DES.
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=item B<DES>
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cipher suites using DES (not triple DES).
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=item B<RC4>
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cipher suites using RC4.
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=item B<RC2>
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cipher suites using RC2.
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=item B<IDEA>
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cipher suites using IDEA.
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=item B<MD5>
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cipher suites using MD5.
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=item B<SHA1>, B<SHA>
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cipher suites using SHA1.
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=back
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=head1 CIPHER SUITE NAMES
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The following lists give the SSL or TLS cipher suites names from the
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relevant specification and their OpenSSL equivalents.
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=head2 SSL v3.0 cipher suites.
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SSL_RSA_WITH_NULL_MD5 NULL-MD5
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SSL_RSA_WITH_NULL_SHA NULL-SHA
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SSL_RSA_EXPORT_WITH_RC4_40_MD5 EXP-RC4-MD5
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SSL_RSA_WITH_RC4_128_MD5 RC4-MD5
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SSL_RSA_WITH_RC4_128_SHA RC4-SHA
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SSL_RSA_EXPORT_WITH_RC2_CBC_40_MD5 EXP-RC2-CBC-MD5
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SSL_RSA_WITH_IDEA_CBC_SHA IDEA-CBC-SHA
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SSL_RSA_EXPORT_WITH_DES40_CBC_SHA EXP-DES-CBC-SHA
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SSL_RSA_WITH_DES_CBC_SHA DES-CBC-SHA
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SSL_RSA_WITH_3DES_EDE_CBC_SHA DES-CBC3-SHA
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SSL_DH_DSS_EXPORT_WITH_DES40_CBC_SHA Not implemented.
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SSL_DH_DSS_WITH_DES_CBC_SHA Not implemented.
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SSL_DH_DSS_WITH_3DES_EDE_CBC_SHA Not implemented.
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SSL_DH_RSA_EXPORT_WITH_DES40_CBC_SHA Not implemented.
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SSL_DH_RSA_WITH_DES_CBC_SHA Not implemented.
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SSL_DH_RSA_WITH_3DES_EDE_CBC_SHA Not implemented.
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SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA EXP-EDH-DSS-DES-CBC-SHA
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SSL_DHE_DSS_WITH_DES_CBC_SHA EDH-DSS-CBC-SHA
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SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA EDH-DSS-DES-CBC3-SHA
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SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA EXP-EDH-RSA-DES-CBC-SHA
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SSL_DHE_RSA_WITH_DES_CBC_SHA EDH-RSA-DES-CBC-SHA
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SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA EDH-RSA-DES-CBC3-SHA
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SSL_DH_anon_EXPORT_WITH_RC4_40_MD5 EXP-ADH-RC4-MD5
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SSL_DH_anon_WITH_RC4_128_MD5 ADH-RC4-MD5
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SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA EXP-ADH-DES-CBC-SHA
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SSL_DH_anon_WITH_DES_CBC_SHA ADH-DES-CBC-SHA
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SSL_DH_anon_WITH_3DES_EDE_CBC_SHA ADH-DES-CBC3-SHA
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SSL_FORTEZZA_KEA_WITH_NULL_SHA Not implemented.
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SSL_FORTEZZA_KEA_WITH_FORTEZZA_CBC_SHA Not implemented.
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SSL_FORTEZZA_KEA_WITH_RC4_128_SHA Not implemented.
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=head2 TLS v1.0 cipher suites.
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TLS_RSA_WITH_NULL_MD5 NULL-MD5
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TLS_RSA_WITH_NULL_SHA NULL-SHA
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TLS_RSA_EXPORT_WITH_RC4_40_MD5 EXP-RC4-MD5
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TLS_RSA_WITH_RC4_128_MD5 RC4-MD5
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TLS_RSA_WITH_RC4_128_SHA RC4-SHA
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TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 EXP-RC2-CBC-MD5
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TLS_RSA_WITH_IDEA_CBC_SHA IDEA-CBC-SHA
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TLS_RSA_EXPORT_WITH_DES40_CBC_SHA EXP-DES-CBC-SHA
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TLS_RSA_WITH_DES_CBC_SHA DES-CBC-SHA
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TLS_RSA_WITH_3DES_EDE_CBC_SHA DES-CBC3-SHA
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TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA Not implemented.
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TLS_DH_DSS_WITH_DES_CBC_SHA Not implemented.
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TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA Not implemented.
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TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA Not implemented.
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TLS_DH_RSA_WITH_DES_CBC_SHA Not implemented.
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TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA Not implemented.
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TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA EXP-EDH-DSS-DES-CBC-SHA
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TLS_DHE_DSS_WITH_DES_CBC_SHA EDH-DSS-CBC-SHA
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TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA EDH-DSS-DES-CBC3-SHA
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TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA EXP-EDH-RSA-DES-CBC-SHA
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TLS_DHE_RSA_WITH_DES_CBC_SHA EDH-RSA-DES-CBC-SHA
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TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA EDH-RSA-DES-CBC3-SHA
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TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 EXP-ADH-RC4-MD5
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TLS_DH_anon_WITH_RC4_128_MD5 ADH-RC4-MD5
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TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA EXP-ADH-DES-CBC-SHA
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TLS_DH_anon_WITH_DES_CBC_SHA ADH-DES-CBC-SHA
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TLS_DH_anon_WITH_3DES_EDE_CBC_SHA ADH-DES-CBC3-SHA
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=head2 Additional Export 1024 and other cipher suites
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Note: these ciphers can also be used in SSL v3.
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TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA EXP1024-DES-CBC-SHA
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TLS_RSA_EXPORT1024_WITH_RC4_56_SHA EXP1024-RC4-SHA
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TLS_DHE_DSS_EXPORT1024_WITH_DES_CBC_SHA EXP1024-DHE-DSS-DES-CBC-SHA
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TLS_DHE_DSS_EXPORT1024_WITH_RC4_56_SHA EXP1024-DHE-DSS-RC4-SHA
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TLS_DHE_DSS_WITH_RC4_128_SHA DHE-DSS-RC4-SHA
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=head2 SSL v2.0 cipher suites.
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SSL_CK_RC4_128_WITH_MD5 RC4-MD5
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SSL_CK_RC4_128_EXPORT40_WITH_MD5 EXP-RC4-MD5
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SSL_CK_RC2_128_CBC_WITH_MD5 RC2-MD5
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SSL_CK_RC2_128_CBC_EXPORT40_WITH_MD5 EXP-RC2-MD5
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SSL_CK_IDEA_128_CBC_WITH_MD5 IDEA-CBC-MD5
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SSL_CK_DES_64_CBC_WITH_MD5 DES-CBC-MD5
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SSL_CK_DES_192_EDE3_CBC_WITH_MD5 DES-CBC3-MD5
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=head1 NOTES
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The non-ephemeral DH modes are currently unimplemented in OpenSSL
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because there is no support for DH certificates.
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Some compiled versions of OpenSSL may not include all the ciphers
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listed here because some ciphers were excluded at compile time.
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=head1 EXAMPLES
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Verbose listing of all OpenSSL ciphers including NULL ciphers:
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openssl ciphers -v 'ALL:eNULL'
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Include all ciphers except NULL and anonymous DH then sort by
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strength:
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openssl ciphers -v 'ALL:!ADH:@STRENGTH'
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Include only 3DES ciphers and then place RSA ciphers last:
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openssl ciphers -v '3DES:+RSA'
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=head1 SEE ALSO
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L<s_client(1)|s_client(1)>, L<s_server(1)|s_server(1)>, L<ssl(3)|ssl(3)>
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=cut
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