doc: ReSTify keys-trusted-encrypted.txt

Adjusts for ReST markup and moves under keys security devel index.

Cc: David Howells <dhowells@redhat.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 0 insertions, 167 deletions

diff --git a/Documentation/security/keys-trusted-encrypted.txt b/Documentation/security/keys-trusted-encrypted.txt
deleted file mode 100644
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--- a/Documentation/security/keys-trusted-encrypted.txt
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-			Trusted and Encrypted Keys
-
-Trusted and Encrypted Keys are two new key types added to the existing kernel
-key ring service.  Both of these new types are variable length symmetric keys,
-and in both cases all keys are created in the kernel, and user space sees,
-stores, and loads only encrypted blobs.  Trusted Keys require the availability
-of a Trusted Platform Module (TPM) chip for greater security, while Encrypted
-Keys can be used on any system.  All user level blobs, are displayed and loaded
-in hex ascii for convenience, and are integrity verified.
-
-Trusted Keys use a TPM both to generate and to seal the keys.  Keys are sealed
-under a 2048 bit RSA key in the TPM, and optionally sealed to specified PCR
-(integrity measurement) values, and only unsealed by the TPM, if PCRs and blob
-integrity verifications match.  A loaded Trusted Key can be updated with new
-(future) PCR values, so keys are easily migrated to new pcr values, such as
-when the kernel and initramfs are updated.  The same key can have many saved
-blobs under different PCR values, so multiple boots are easily supported.
-
-By default, trusted keys are sealed under the SRK, which has the default
-authorization value (20 zeros).  This can be set at takeownership time with the
-trouser's utility: "tpm_takeownership -u -z".
-
-Usage:
-    keyctl add trusted name "new keylen [options]" ring
-    keyctl add trusted name "load hex_blob [pcrlock=pcrnum]" ring
-    keyctl update key "update [options]"
-    keyctl print keyid
-
-    options:
-       keyhandle=    ascii hex value of sealing key default 0x40000000 (SRK)
-       keyauth=	     ascii hex auth for sealing key default 0x00...i
-                     (40 ascii zeros)
-       blobauth=     ascii hex auth for sealed data default 0x00...
-                     (40 ascii zeros)
-       pcrinfo=	     ascii hex of PCR_INFO or PCR_INFO_LONG (no default)
-       pcrlock=	     pcr number to be extended to "lock" blob
-       migratable=   0|1 indicating permission to reseal to new PCR values,
-                     default 1 (resealing allowed)
-       hash=         hash algorithm name as a string. For TPM 1.x the only
-                     allowed value is sha1. For TPM 2.x the allowed values
-                     are sha1, sha256, sha384, sha512 and sm3-256.
-       policydigest= digest for the authorization policy. must be calculated
-                     with the same hash algorithm as specified by the 'hash='
-                     option.
-       policyhandle= handle to an authorization policy session that defines the
-                     same policy and with the same hash algorithm as was used to
-                     seal the key.
-
-"keyctl print" returns an ascii hex copy of the sealed key, which is in standard
-TPM_STORED_DATA format.  The key length for new keys are always in bytes.
-Trusted Keys can be 32 - 128 bytes (256 - 1024 bits), the upper limit is to fit
-within the 2048 bit SRK (RSA) keylength, with all necessary structure/padding.
-
-Encrypted keys do not depend on a TPM, and are faster, as they use AES for
-encryption/decryption.  New keys are created from kernel generated random
-numbers, and are encrypted/decrypted using a specified 'master' key.  The
-'master' key can either be a trusted-key or user-key type.  The main
-disadvantage of encrypted keys is that if they are not rooted in a trusted key,
-they are only as secure as the user key encrypting them.  The master user key
-should therefore be loaded in as secure a way as possible, preferably early in
-boot.
-
-The decrypted portion of encrypted keys can contain either a simple symmetric
-key or a more complex structure. The format of the more complex structure is
-application specific, which is identified by 'format'.
-
-Usage:
-    keyctl add encrypted name "new [format] key-type:master-key-name keylen"
-        ring
-    keyctl add encrypted name "load hex_blob" ring
-    keyctl update keyid "update key-type:master-key-name"
-
-format:= 'default | ecryptfs'
-key-type:= 'trusted' | 'user'
-
-
-Examples of trusted and encrypted key usage:
-
-Create and save a trusted key named "kmk" of length 32 bytes:
-
-    $ keyctl add trusted kmk "new 32" @u
-    440502848
-
-    $ keyctl show
-    Session Keyring
-           -3 --alswrv    500   500  keyring: _ses
-     97833714 --alswrv    500    -1   \_ keyring: _uid.500
-    440502848 --alswrv    500   500       \_ trusted: kmk
-
-    $ keyctl print 440502848
-    0101000000000000000001005d01b7e3f4a6be5709930f3b70a743cbb42e0cc95e18e915
-    3f60da455bbf1144ad12e4f92b452f966929f6105fd29ca28e4d4d5a031d068478bacb0b
-    27351119f822911b0a11ba3d3498ba6a32e50dac7f32894dd890eb9ad578e4e292c83722
-    a52e56a097e6a68b3f56f7a52ece0cdccba1eb62cad7d817f6dc58898b3ac15f36026fec
-    d568bd4a706cb60bb37be6d8f1240661199d640b66fb0fe3b079f97f450b9ef9c22c6d5d
-    dd379f0facd1cd020281dfa3c70ba21a3fa6fc2471dc6d13ecf8298b946f65345faa5ef0
-    f1f8fff03ad0acb083725535636addb08d73dedb9832da198081e5deae84bfaf0409c22b
-    e4a8aea2b607ec96931e6f4d4fe563ba
-
-    $ keyctl pipe 440502848 > kmk.blob
-
-Load a trusted key from the saved blob:
-
-    $ keyctl add trusted kmk "load `cat kmk.blob`" @u
-    268728824
-
-    $ keyctl print 268728824
-    0101000000000000000001005d01b7e3f4a6be5709930f3b70a743cbb42e0cc95e18e915
-    3f60da455bbf1144ad12e4f92b452f966929f6105fd29ca28e4d4d5a031d068478bacb0b
-    27351119f822911b0a11ba3d3498ba6a32e50dac7f32894dd890eb9ad578e4e292c83722
-    a52e56a097e6a68b3f56f7a52ece0cdccba1eb62cad7d817f6dc58898b3ac15f36026fec
-    d568bd4a706cb60bb37be6d8f1240661199d640b66fb0fe3b079f97f450b9ef9c22c6d5d
-    dd379f0facd1cd020281dfa3c70ba21a3fa6fc2471dc6d13ecf8298b946f65345faa5ef0
-    f1f8fff03ad0acb083725535636addb08d73dedb9832da198081e5deae84bfaf0409c22b
-    e4a8aea2b607ec96931e6f4d4fe563ba
-
-Reseal a trusted key under new pcr values:
-
-    $ keyctl update 268728824 "update pcrinfo=`cat pcr.blob`"
-    $ keyctl print 268728824
-    010100000000002c0002800093c35a09b70fff26e7a98ae786c641e678ec6ffb6b46d805
-    77c8a6377aed9d3219c6dfec4b23ffe3000001005d37d472ac8a44023fbb3d18583a4f73
-    d3a076c0858f6f1dcaa39ea0f119911ff03f5406df4f7f27f41da8d7194f45c9f4e00f2e
-    df449f266253aa3f52e55c53de147773e00f0f9aca86c64d94c95382265968c354c5eab4
-    9638c5ae99c89de1e0997242edfb0b501744e11ff9762dfd951cffd93227cc513384e7e6
-    e782c29435c7ec2edafaa2f4c1fe6e7a781b59549ff5296371b42133777dcc5b8b971610
-    94bc67ede19e43ddb9dc2baacad374a36feaf0314d700af0a65c164b7082401740e489c9
-    7ef6a24defe4846104209bf0c3eced7fa1a672ed5b125fc9d8cd88b476a658a4434644ef
-    df8ae9a178e9f83ba9f08d10fa47e4226b98b0702f06b3b8
-
-The initial consumer of trusted keys is EVM, which at boot time needs a high
-quality symmetric key for HMAC protection of file metadata.  The use of a
-trusted key provides strong guarantees that the EVM key has not been
-compromised by a user level problem, and when sealed to specific boot PCR
-values, protects against boot and offline attacks.  Create and save an
-encrypted key "evm" using the above trusted key "kmk":
-
-option 1: omitting 'format'
-    $ keyctl add encrypted evm "new trusted:kmk 32" @u
-    159771175
-
-option 2: explicitly defining 'format' as 'default'
-    $ keyctl add encrypted evm "new default trusted:kmk 32" @u
-    159771175
-
-    $ keyctl print 159771175
-    default trusted:kmk 32 2375725ad57798846a9bbd240de8906f006e66c03af53b1b3
-    82dbbc55be2a44616e4959430436dc4f2a7a9659aa60bb4652aeb2120f149ed197c564e0
-    24717c64 5972dcb82ab2dde83376d82b2e3c09ffc
-
-    $ keyctl pipe 159771175 > evm.blob
-
-Load an encrypted key "evm" from saved blob:
-
-    $ keyctl add encrypted evm "load `cat evm.blob`" @u
-    831684262
-
-    $ keyctl print 831684262
-    default trusted:kmk 32 2375725ad57798846a9bbd240de8906f006e66c03af53b1b3
-    82dbbc55be2a44616e4959430436dc4f2a7a9659aa60bb4652aeb2120f149ed197c564e0
-    24717c64 5972dcb82ab2dde83376d82b2e3c09ffc
-
-Other uses for trusted and encrypted keys, such as for disk and file encryption
-are anticipated.  In particular the new format 'ecryptfs' has been defined in
-in order to use encrypted keys to mount an eCryptfs filesystem.  More details
-about the usage can be found in the file
-'Documentation/security/keys-ecryptfs.txt'.