337 lines
11 KiB
Plaintext
337 lines
11 KiB
Plaintext
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#
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# For a description of the syntax of this configuration file,
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# see scripts/config/Kconfig-language.txt
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#
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menu "SSL Library"
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choice
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prompt "Mode"
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default CONFIG_SSL_FULL_MODE
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config CONFIG_SSL_SERVER_ONLY
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bool "Server only - no verification"
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help
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Enable server functionality (no client functionality).
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This mode still supports sessions and chaining (which can be turned
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off in configuration).
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The axssl sample runs with the minimum of features.
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This is the most space efficient of the modes with the library
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about 45kB in size. Use this mode if you are doing standard SSL server
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work.
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config CONFIG_SSL_CERT_VERIFICATION
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bool "Server only - with verification"
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help
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Enable server functionality with client authentication (no client
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functionality).
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The axssl sample runs with the "-verify" and "-CAfile" options.
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This mode produces a library about 49kB in size. Use this mode if you
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have an SSL server which requires client authentication (which is
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uncommon in browser applications).
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config CONFIG_SSL_ENABLE_CLIENT
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bool "Client/Server enabled"
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help
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Enable client/server functionality (including peer authentication).
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The axssl sample runs with the "s_client" option enabled.
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This mode produces a library about 51kB in size. Use this mode if you
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require axTLS to use SSL client functionality (the SSL server code
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is always enabled).
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config CONFIG_SSL_FULL_MODE
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bool "Client/Server enabled with diagnostics"
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help
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Enable client/server functionality including diagnostics. Most of the
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extra size in this mode is due to the storage of various strings that
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are used.
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The axssl sample has 3 more options, "-debug", "-state" and "-show-rsa"
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This mode produces a library about 58kB in size. It is suggested that
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this mode is used only during development, or systems that have more
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generous memory limits.
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It is the default to demonstrate the features of axTLS.
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config CONFIG_SSL_SKELETON_MODE
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bool "Skeleton mode - the smallest server mode"
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help
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This is an experiment to build the smallest library at the expense of
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features and speed.
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* Server mode only.
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* The AES cipher is disabled.
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* No session resumption.
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* No external keys/certificates are supported.
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* The bigint library has most of the performance features disabled.
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* Some other features/API calls may not work.
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This mode produces a library about 37kB in size. The main
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disadvantage of this mode is speed - it will be much slower than the
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other build modes.
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endchoice
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choice
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prompt "Protocol Preference"
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depends on !CONFIG_SSL_SKELETON_MODE
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default CONFIG_SSL_PROT_MEDIUM
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config CONFIG_SSL_PROT_LOW
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bool "Low"
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help
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Chooses the cipher in the order of RC4-SHA, AES128-SHA, AES256-SHA.
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This will use the fastest cipher(s) but at the expense of security.
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config CONFIG_SSL_PROT_MEDIUM
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bool "Medium"
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help
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Chooses the cipher in the order of AES128-SHA, AES256-SHA, RC4-SHA.
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This mode is a balance between speed and security and is the default.
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config CONFIG_SSL_PROT_HIGH
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bool "High"
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help
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Chooses the cipher in the order of AES256-SHA, AES128-SHA, RC4-SHA.
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This will use the strongest cipher(s) at the cost of speed.
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endchoice
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config CONFIG_SSL_USE_DEFAULT_KEY
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bool "Enable default key"
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depends on !CONFIG_SSL_SKELETON_MODE
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default y
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help
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Some applications will not require the default private key/certificate
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that is built in. This is one way to save on a couple of kB's if an
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external private key/certificate is used.
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The private key is in ssl/private_key.h and the certificate is in
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ssl/cert.h.
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The advantage of a built-in private key/certificate is that no file
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system is required for access. Both the certificate and the private
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key will be automatically loaded on a ssl_ctx_new().
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However this private key/certificate can never be changed (without a
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code update).
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This mode is enabled by default. Disable this mode if the
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built-in key/certificate is not used.
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config CONFIG_SSL_PRIVATE_KEY_LOCATION
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string "Private key file location"
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depends on !CONFIG_SSL_USE_DEFAULT_KEY && !CONFIG_SSL_SKELETON_MODE
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help
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The file location of the private key which will be automatically
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loaded on a ssl_ctx_new().
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config CONFIG_SSL_PRIVATE_KEY_PASSWORD
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string "Private key password"
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depends on !CONFIG_SSL_USE_DEFAULT_KEY && CONFIG_SSL_HAS_PEM
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help
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The password required to decrypt a PEM-encoded password file.
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config CONFIG_SSL_X509_CERT_LOCATION
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string "X.509 certificate file location"
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depends on !CONFIG_SSL_GENERATE_X509_CERT && !CONFIG_SSL_USE_DEFAULT_KEY && !CONFIG_SSL_SKELETON_MODE
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help
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The file location of the X.509 certificate which will be automatically
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loaded on a ssl_ctx_new().
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config CONFIG_SSL_GENERATE_X509_CERT
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bool "Generate X.509 Certificate"
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default n
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help
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An X.509 certificate can be automatically generated on a
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ssl_ctx_new(). A private key still needs to be provided (the private
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key in ss/private_key.h will be used unless
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CONFIG_SSL_PRIVATE_KEY_LOCATION is set).
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The certificate is generated on the fly, and so a minor start-up time
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penalty is to be expected. This feature adds around 5kB to the
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library.
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This feature is disabled by default.
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config CONFIG_SSL_X509_COMMON_NAME
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string "X.509 Common Name"
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depends on CONFIG_SSL_GENERATE_X509_CERT
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help
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The common name for the X.509 certificate. This should be the fully
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qualified domain name (FQDN), e.g. www.foo.com.
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If this is blank, then this will be value from gethostname() and
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getdomainname().
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config CONFIG_SSL_X509_ORGANIZATION_NAME
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string "X.509 Organization Name"
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depends on CONFIG_SSL_GENERATE_X509_CERT
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help
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The organization name for the generated X.509 certificate.
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This field is optional.
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config CONFIG_SSL_X509_ORGANIZATION_UNIT_NAME
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string "X.509 Organization Unit Name"
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depends on CONFIG_SSL_GENERATE_X509_CERT
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help
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The organization unit name for the generated X.509 certificate.
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This field is optional.
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config CONFIG_SSL_ENABLE_V23_HANDSHAKE
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bool "Enable v23 Handshake"
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default y
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help
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Some browsers use the v23 handshake client hello message
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(an SSL2 format message which all SSL servers can understand).
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It may be used if SSL2 is enabled in the browser.
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Since this feature takes a kB or so, this feature may be disabled - at
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the risk of making it incompatible with some browsers (IE6 is ok,
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Firefox 1.5 and below use it).
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Disable if backwards compatibility is not an issue (i.e. the client is
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always using TLS1.0)
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config CONFIG_SSL_HAS_PEM
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bool "Enable PEM"
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default n if !CONFIG_SSL_FULL_MODE
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default y if CONFIG_SSL_FULL_MODE
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depends on !CONFIG_SSL_SKELETON_MODE
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help
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Enable the use of PEM format for certificates and private keys.
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PEM is not normally needed - PEM files can be converted into DER files
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quite easily. However they have the convenience of allowing multiple
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certificates/keys in the same file.
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This feature will add a couple of kB to the library.
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Disable if PEM is not used (which will be in most cases).
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config CONFIG_SSL_USE_PKCS12
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bool "Use PKCS8/PKCS12"
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default n if !CONFIG_SSL_FULL_MODE
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default y if CONFIG_SSL_FULL_MODE
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depends on !CONFIG_SSL_SERVER_ONLY && !CONFIG_SSL_SKELETON_MODE
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help
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PKCS#12 certificates combine private keys and certificates together in
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one file.
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PKCS#8 private keys are also suppported (as it is a subset of PKCS#12).
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The decryption of these certificates uses RC4-128 (and these
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certificates must be encrypted using this cipher). The actual
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algorithm is "PBE-SHA1-RC4-128".
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Disable if PKCS#12 is not used (which will be in most cases).
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config CONFIG_SSL_EXPIRY_TIME
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int "Session expiry time (in hours)"
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depends on !CONFIG_SSL_SKELETON_MODE
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default 24
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help
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The time (in hours) before a session expires.
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A longer time means that the expensive parts of a handshake don't
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need to be run when a client reconnects later.
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The default is 1 day.
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config CONFIG_X509_MAX_CA_CERTS
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int "Maximum number of certificate authorites"
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default 4
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depends on !CONFIG_SSL_SERVER_ONLY && !CONFIG_SSL_SKELETON_MODE
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help
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Determines the number of CA's allowed.
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Increase this figure if more trusted sites are allowed. Each
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certificate adds about 300 bytes (when added).
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The default is to allow four certification authorities.
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config CONFIG_SSL_MAX_CERTS
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int "Maximum number of chained certificates"
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default 2
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help
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Determines the number of certificates used in a certificate
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chain. The chain length must be at least 1.
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Increase this figure if more certificates are to be added to the
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chain. Each certificate adds about 300 bytes (when added).
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The default is to allow one certificate + 1 certificate in the chain
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(which may be the certificate authority certificate).
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config CONFIG_SSL_CTX_MUTEXING
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bool "Enable SSL_CTX mutexing"
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default n
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help
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Normally mutexing is not required - each SSL_CTX object can deal with
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many SSL objects (as long as each SSL_CTX object is using a single
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thread).
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If the SSL_CTX object is not thread safe e.g. the case where a
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new thread is created for each SSL object, then mutexing is required.
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Select y when a mutex on the SSL_CTX object is required.
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config CONFIG_USE_DEV_URANDOM
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bool "Use /dev/urandom"
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default y
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depends on !CONFIG_PLATFORM_WIN32
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help
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Use /dev/urandom. Otherwise a custom RNG is used.
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This will be the default on most Linux systems.
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config CONFIG_WIN32_USE_CRYPTO_LIB
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bool "Use Win32 Crypto Library"
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depends on CONFIG_PLATFORM_WIN32
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help
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Microsoft produce a Crypto API which requires the Platform SDK to be
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installed. It's used for the RNG.
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This will be the default on most Win32 systems.
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config CONFIG_OPENSSL_COMPATIBLE
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bool "Enable openssl API compatibility"
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default n
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help
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To ease the porting of openssl applications, a subset of the openssl
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API is wrapped around the axTLS API.
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Note: not all the API is implemented, so parts may still break. And
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it's definitely not 100% compatible.
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config CONFIG_PERFORMANCE_TESTING
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bool "Build the bigint performance test tool"
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default n
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help
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Used for performance testing of bigint.
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This is a testing tool and is normally disabled.
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config CONFIG_SSL_TEST
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bool "Build the SSL testing tool"
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default n
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depends on CONFIG_SSL_FULL_MODE && !CONFIG_SSL_GENERATE_X509_CERT
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help
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Used for sanity checking the SSL handshaking.
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This is a testing tool and is normally disabled.
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endmenu
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