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Clarify crypto policies documentation in manual pages

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* All the options that are affected by crypto policies will mention that + and -
       work with built-in defaults and not the crypto-policies ones.
     * The line mentioning crypto policies will be the first one in the option description.
This commit is contained in:
Jakub Jelen 2020-03-26 14:53:18 +01:00
parent eb546ec1a7
commit a848054c8a
1 changed files with 287 additions and 62 deletions
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349
openssh-8.0p1-crypto-policies.patch
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@ -1,8 +1,15 @@
diff -up openssh/ssh_config.5.crypto-policies openssh/ssh_config.5 diff -up openssh-8.2p1/ssh_config.5.crypto-policies openssh-8.2p1/ssh_config.5
--- openssh/ssh_config.5.crypto-policies 2020-02-07 15:05:55.665451715 +0100 --- openssh-8.2p1/ssh_config.5.crypto-policies 2020-03-26 14:40:44.546775605 +0100
+++ openssh/ssh_config.5 2020-02-07 15:07:11.632641922 +0100 +++ openssh-8.2p1/ssh_config.5 2020-03-26 14:52:20.700649727 +0100
@@ -361,15 +361,15 @@ domains. @@ -359,17 +359,17 @@ or
.Qq *.c.example.com
domains.
.It Cm CASignatureAlgorithms .It Cm CASignatureAlgorithms
+The default is handled system-wide by
+.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 .
+.Pp
Specifies which algorithms are allowed for signing of certificates Specifies which algorithms are allowed for signing of certificates
by certificate authorities (CAs). by certificate authorities (CAs).
-The default is: -The default is:
@ -15,15 +22,39 @@ diff -up openssh/ssh_config.5.crypto-policies openssh/ssh_config.5
will not accept host certificates signed using algorithms other than those will not accept host certificates signed using algorithms other than those
specified. specified.
+.Pp +.Pp
.It Cm CertificateFile
Specifies a file from which the user's certificate is read.
A corresponding private key must be provided separately in order
@@ -424,20 +424,25 @@ If the option is set to
.Cm no ,
the check will not be executed.
.It Cm Ciphers
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
+.Pp +.Pp
.It Cm CertificateFile Specifies the ciphers allowed and their order of preference.
Specifies a file from which the user's certificate is read. Multiple ciphers must be comma-separated.
A corresponding private key must be provided separately in order If the specified list begins with a
@@ -453,12 +453,10 @@ aes256-gcm@openssh.com .Sq +
-character, then the specified ciphers will be appended to the default set
+character, then the specified ciphers will be appended to the built-in default set
instead of replacing them.
If the specified list begins with a
.Sq -
character, then the specified ciphers (including wildcards) will be removed
-from the default set instead of replacing them.
+from the built-in default set instead of replacing them.
If the specified list begins with a
.Sq ^
character, then the specified ciphers will be placed at the head of the
-default set.
+built-in default set.
.Pp
The supported ciphers are:
.Bd -literal -offset indent
@@ -453,13 +458,6 @@ aes256-gcm@openssh.com
chacha20-poly1305@openssh.com chacha20-poly1305@openssh.com
.Ed .Ed
.Pp .Pp
@ -33,31 +64,59 @@ diff -up openssh/ssh_config.5.crypto-policies openssh/ssh_config.5
-aes128-ctr,aes192-ctr,aes256-ctr, -aes128-ctr,aes192-ctr,aes256-ctr,
-aes128-gcm@openssh.com,aes256-gcm@openssh.com -aes128-gcm@openssh.com,aes256-gcm@openssh.com
-.Ed -.Ed
-.Pp
The list of available ciphers may also be obtained using
.Qq ssh -Q cipher .
.It Cm ClearAllForwardings
@@ -812,6 +810,11 @@ command line will be passed untouched to
The default is
.Dq no .
.It Cm GSSAPIKexAlgorithms
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
.Pp +.Pp
The list of available ciphers may also be obtained using The list of key exchange algorithms that are offered for GSSAPI
.Qq ssh -Q cipher . key exchange. Possible values are
@@ -824,9 +822,10 @@ gss-nistp256-sha256-, .Bd -literal -offset 3n
@@ -824,10 +827,8 @@ gss-nistp256-sha256-,
gss-curve25519-sha256- gss-curve25519-sha256-
.Ed .Ed
.Pp .Pp
-The default is -The default is
-.Dq gss-group14-sha256-,gss-group16-sha512-,gss-nistp256-sha256-, -.Dq gss-group14-sha256-,gss-group16-sha512-,gss-nistp256-sha256-,
-gss-curve25519-sha256-,gss-group14-sha1-,gss-gex-sha1- . -gss-curve25519-sha256-,gss-group14-sha1-,gss-gex-sha1- .
This option only applies to connections using GSSAPI.
+.Pp
.It Cm HashKnownHosts
Indicates that
.Xr ssh 1
@@ -1149,29 +1150,25 @@ it may be zero or more of:
and
.Cm pam .
.It Cm KexAlgorithms
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
This option only applies to connections using GSSAPI. +.Pp
.It Cm HashKnownHosts Specifies the available KEX (Key Exchange) algorithms.
Indicates that Multiple algorithms must be comma-separated.
@@ -1162,15 +1162,10 @@ If the specified list begins with a If the specified list begins with a
.Sq +
-character, then the specified methods will be appended to the default set
+character, then the specified methods will be appended to the built-in default set
instead of replacing them.
If the specified list begins with a
.Sq -
character, then the specified methods (including wildcards) will be removed
-from the default set instead of replacing them.
+from the built-in default set instead of replacing them.
If the specified list begins with a
.Sq ^ .Sq ^
character, then the specified methods will be placed at the head of the character, then the specified methods will be placed at the head of the
default set. -default set.
-The default is: -The default is:
-.Bd -literal -offset indent -.Bd -literal -offset indent
-curve25519-sha256,curve25519-sha256@libssh.org, -curve25519-sha256,curve25519-sha256@libssh.org,
@ -67,14 +126,41 @@ diff -up openssh/ssh_config.5.crypto-policies openssh/ssh_config.5
-diffie-hellman-group18-sha512, -diffie-hellman-group18-sha512,
-diffie-hellman-group14-sha256 -diffie-hellman-group14-sha256
-.Ed -.Ed
+built-in default set.
.Pp
The list of available key exchange algorithms may also be obtained using
.Qq ssh -Q kex .
@@ -1231,37 +1228,33 @@ The default is INFO.
DEBUG and DEBUG1 are equivalent.
DEBUG2 and DEBUG3 each specify higher levels of verbose output.
.It Cm MACs
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
+.Pp
Specifies the MAC (message authentication code) algorithms
in order of preference.
The MAC algorithm is used for data integrity protection.
Multiple algorithms must be comma-separated.
If the specified list begins with a
.Sq +
-character, then the specified algorithms will be appended to the default set
+character, then the specified algorithms will be appended to the built-in default set
instead of replacing them.
If the specified list begins with a
.Sq -
character, then the specified algorithms (including wildcards) will be removed
-from the default set instead of replacing them.
+from the built-in default set instead of replacing them.
If the specified list begins with a
.Sq ^
character, then the specified algorithms will be placed at the head of the
-default set.
+built-in default set.
.Pp .Pp
The list of available key exchange algorithms may also be obtained using The algorithms that contain
.Qq ssh -Q kex . .Qq -etm
@@ -1252,14 +1247,10 @@ The algorithms that contain
calculate the MAC after encryption (encrypt-then-mac). calculate the MAC after encryption (encrypt-then-mac).
These are considered safer and their use recommended. These are considered safer and their use recommended.
.Pp .Pp
@ -86,17 +172,35 @@ diff -up openssh/ssh_config.5.crypto-policies openssh/ssh_config.5
-umac-64@openssh.com,umac-128@openssh.com, -umac-64@openssh.com,umac-128@openssh.com,
-hmac-sha2-256,hmac-sha2-512,hmac-sha1 -hmac-sha2-256,hmac-sha2-512,hmac-sha1
-.Ed -.Ed
-.Pp
The list of available MAC algorithms may also be obtained using
.Qq ssh -Q mac .
.It Cm NoHostAuthenticationForLocalhost
@@ -1394,36 +1387,25 @@ instead of continuing to execute and pas
The default is
.Cm no .
.It Cm PubkeyAcceptedKeyTypes
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
.Pp +.Pp
The list of available MAC algorithms may also be obtained using Specifies the key types that will be used for public key authentication
.Qq ssh -Q mac . as a comma-separated list of patterns.
@@ -1407,22 +1398,10 @@ If the specified list begins with a If the specified list begins with a
.Sq +
-character, then the key types after it will be appended to the default
+character, then the key types after it will be appended to the built-in default
instead of replacing it.
If the specified list begins with a
.Sq -
character, then the specified key types (including wildcards) will be removed
-from the default set instead of replacing them.
+from the built-in default set instead of replacing them.
If the specified list begins with a
.Sq ^ .Sq ^
character, then the specified key types will be placed at the head of the character, then the specified key types will be placed at the head of the
default set. -default set.
-The default for this option is: -The default for this option is:
-.Bd -literal -offset 3n -.Bd -literal -offset 3n
-ecdsa-sha2-nistp256-cert-v01@openssh.com, -ecdsa-sha2-nistp256-cert-v01@openssh.com,
@ -113,18 +217,22 @@ diff -up openssh/ssh_config.5.crypto-policies openssh/ssh_config.5
-ssh-ed25519,sk-ssh-ed25519@openssh.com, -ssh-ed25519,sk-ssh-ed25519@openssh.com,
-rsa-sha2-512,rsa-sha2-256,ssh-rsa -rsa-sha2-512,rsa-sha2-256,ssh-rsa
-.Ed -.Ed
+built-in default set.
.Pp
The list of available key types may also be obtained using
.Qq ssh -Q PubkeyAcceptedKeyTypes .
diff -up openssh-8.2p1/sshd_config.5.crypto-policies openssh-8.2p1/sshd_config.5
--- openssh-8.2p1/sshd_config.5.crypto-policies 2020-03-26 14:40:44.530775355 +0100
+++ openssh-8.2p1/sshd_config.5 2020-03-26 14:48:56.732468099 +0100
@@ -375,16 +375,16 @@ If the argument is
then no banner is displayed.
By default, no banner is displayed.
.It Cm CASignatureAlgorithms
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
.Pp +.Pp
The list of available key types may also be obtained using
.Qq ssh -Q PubkeyAcceptedKeyTypes .
diff -up openssh/sshd_config.5.crypto-policies openssh/sshd_config.5
--- openssh/sshd_config.5.crypto-policies 2020-02-07 15:05:55.639451308 +0100
+++ openssh/sshd_config.5 2020-02-07 15:05:55.672451825 +0100
@@ -377,14 +377,14 @@ By default, no banner is displayed.
.It Cm CASignatureAlgorithms
Specifies which algorithms are allowed for signing of certificates Specifies which algorithms are allowed for signing of certificates
by certificate authorities (CAs). by certificate authorities (CAs).
-The default is: -The default is:
@ -136,15 +244,39 @@ diff -up openssh/sshd_config.5.crypto-policies openssh/sshd_config.5
Certificates signed using other algorithms will not be accepted for Certificates signed using other algorithms will not be accepted for
public key or host-based authentication. public key or host-based authentication.
+.Pp +.Pp
.It Cm ChallengeResponseAuthentication
Specifies whether challenge-response authentication is allowed (e.g. via
PAM or through authentication styles supported in
@@ -446,20 +446,25 @@ The default is
indicating not to
.Xr chroot 2 .
.It Cm Ciphers
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
+.Pp +.Pp
.It Cm ChallengeResponseAuthentication Specifies the ciphers allowed.
Specifies whether challenge-response authentication is allowed (e.g. via Multiple ciphers must be comma-separated.
PAM or through authentication styles supported in If the specified list begins with a
@@ -486,12 +486,10 @@ aes256-gcm@openssh.com .Sq +
-character, then the specified ciphers will be appended to the default set
+character, then the specified ciphers will be appended to the built-in default set
instead of replacing them.
If the specified list begins with a
.Sq -
character, then the specified ciphers (including wildcards) will be removed
-from the default set instead of replacing them.
+from the built-in default set instead of replacing them.
If the specified list begins with a
.Sq ^
character, then the specified ciphers will be placed at the head of the
-default set.
+built-in default set.
.Pp
The supported ciphers are:
.Pp
@@ -486,13 +491,6 @@ aes256-gcm@openssh.com
chacha20-poly1305@openssh.com chacha20-poly1305@openssh.com
.El .El
.Pp .Pp
@ -154,29 +286,54 @@ diff -up openssh/sshd_config.5.crypto-policies openssh/sshd_config.5
-aes128-ctr,aes192-ctr,aes256-ctr, -aes128-ctr,aes192-ctr,aes256-ctr,
-aes128-gcm@openssh.com,aes256-gcm@openssh.com -aes128-gcm@openssh.com,aes256-gcm@openssh.com
-.Ed -.Ed
-.Pp
The list of available ciphers may also be obtained using
.Qq ssh -Q cipher .
.It Cm ClientAliveCountMax
@@ -681,22 +679,24 @@ For this to work
.Cm GSSAPIKeyExchange
needs to be enabled in the server and also used by the client.
.It Cm GSSAPIKexAlgorithms
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
.Pp +.Pp
The list of available ciphers may also be obtained using The list of key exchange algorithms that are accepted by GSSAPI
.Qq ssh -Q cipher . key exchange. Possible values are
@@ -693,9 +691,10 @@ gss-nistp256-sha256-, .Bd -literal -offset 3n
-gss-gex-sha1-,
-gss-group1-sha1-,
-gss-group14-sha1-,
-gss-group14-sha256-,
-gss-group16-sha512-,
-gss-nistp256-sha256-,
+gss-gex-sha1-
+gss-group1-sha1-
+gss-group14-sha1-
+gss-group14-sha256-
+gss-group16-sha512-
+gss-nistp256-sha256-
gss-curve25519-sha256- gss-curve25519-sha256-
.Ed .Ed
.Pp -.Pp
-The default is -The default is
-.Dq gss-group14-sha256-,gss-group16-sha512-,gss-nistp256-sha256-, -.Dq gss-group14-sha256-,gss-group16-sha512-,gss-nistp256-sha256-,
-gss-curve25519-sha256-,gss-group14-sha1-,gss-gex-sha1- . -gss-curve25519-sha256-,gss-group14-sha1-,gss-gex-sha1- .
This option only applies to connections using GSSAPI.
+.Pp
.It Cm HostbasedAcceptedKeyTypes
Specifies the key types that will be accepted for hostbased authentication
as a list of comma-separated patterns.
@@ -793,25 +793,13 @@ is specified, the location of the socket
.Ev SSH_AUTH_SOCK
environment variable.
.It Cm HostKeyAlgorithms
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
This option only applies to connections using GSSAPI. +.Pp
.It Cm HostbasedAcceptedKeyTypes
Specifies the key types that will be accepted for hostbased authentication
@@ -794,22 +794,10 @@ environment variable.
.It Cm HostKeyAlgorithms
Specifies the host key algorithms Specifies the host key algorithms
that the server offers. that the server offers.
-The default for this option is: -The default for this option is:
@ -195,14 +352,40 @@ diff -up openssh/sshd_config.5.crypto-policies openssh/sshd_config.5
-ssh-ed25519,sk-ssh-ed25519@openssh.com, -ssh-ed25519,sk-ssh-ed25519@openssh.com,
-rsa-sha2-512,rsa-sha2-256,ssh-rsa -rsa-sha2-512,rsa-sha2-256,ssh-rsa
-.Ed -.Ed
-.Pp
The list of available key types may also be obtained using
.Qq ssh -Q HostKeyAlgorithms .
.It Cm IgnoreRhosts
@@ -943,20 +931,25 @@ Specifies whether to look at .k5login fi
The default is
.Cm yes .
.It Cm KexAlgorithms
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
+.Pp
Specifies the available KEX (Key Exchange) algorithms.
Multiple algorithms must be comma-separated.
Alternately if the specified list begins with a
.Sq +
-character, then the specified methods will be appended to the default set
+character, then the specified methods will be appended to the built-in default set
instead of replacing them.
If the specified list begins with a
.Sq -
character, then the specified methods (including wildcards) will be removed
-from the default set instead of replacing them.
+from the built-in default set instead of replacing them.
If the specified list begins with a
.Sq ^
character, then the specified methods will be placed at the head of the
-default set.
+built-in default set.
The supported algorithms are:
.Pp .Pp
The list of available key types may also be obtained using .Bl -item -compact -offset indent
.Qq ssh -Q HostKeyAlgorithms . @@ -988,15 +981,6 @@ ecdh-sha2-nistp521
@@ -987,14 +975,10 @@ ecdh-sha2-nistp521
sntrup4591761x25519-sha512@tinyssh.org sntrup4591761x25519-sha512@tinyssh.org
.El .El
.Pp .Pp
@ -214,14 +397,41 @@ diff -up openssh/sshd_config.5.crypto-policies openssh/sshd_config.5
-diffie-hellman-group16-sha512,diffie-hellman-group18-sha512, -diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,
-diffie-hellman-group14-sha256 -diffie-hellman-group14-sha256
-.Ed -.Ed
-.Pp
The list of available key exchange algorithms may also be obtained using
.Qq ssh -Q KexAlgorithms .
.It Cm ListenAddress
@@ -1065,21 +1049,26 @@ DEBUG and DEBUG1 are equivalent.
DEBUG2 and DEBUG3 each specify higher levels of debugging output.
Logging with a DEBUG level violates the privacy of users and is not recommended.
.It Cm MACs
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
+.Pp
Specifies the available MAC (message authentication code) algorithms.
The MAC algorithm is used for data integrity protection.
Multiple algorithms must be comma-separated.
If the specified list begins with a
.Sq +
-character, then the specified algorithms will be appended to the default set
+character, then the specified algorithms will be appended to the built-in default set
instead of replacing them.
If the specified list begins with a
.Sq -
character, then the specified algorithms (including wildcards) will be removed
-from the default set instead of replacing them.
+from the built-in default set instead of replacing them.
If the specified list begins with a
.Sq ^
character, then the specified algorithms will be placed at the head of the
-default set.
+built-in default set.
.Pp .Pp
The list of available key exchange algorithms may also be obtained using The algorithms that contain
.Qq ssh -Q KexAlgorithms . .Qq -etm
@@ -1121,14 +1105,10 @@ umac-64-etm@openssh.com @@ -1122,15 +1111,6 @@ umac-64-etm@openssh.com
umac-128-etm@openssh.com umac-128-etm@openssh.com
.El .El
.Pp .Pp
@ -233,17 +443,35 @@ diff -up openssh/sshd_config.5.crypto-policies openssh/sshd_config.5
-umac-64@openssh.com,umac-128@openssh.com, -umac-64@openssh.com,umac-128@openssh.com,
-hmac-sha2-256,hmac-sha2-512,hmac-sha1 -hmac-sha2-256,hmac-sha2-512,hmac-sha1
-.Ed -.Ed
-.Pp
The list of available MAC algorithms may also be obtained using
.Qq ssh -Q mac .
.It Cm Match
@@ -1480,36 +1460,25 @@ or equivalent.)
The default is
.Cm yes .
.It Cm PubkeyAcceptedKeyTypes
+The default is handled system-wide by +The default is handled system-wide by
+.Xr crypto-policies 7 . +.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page +To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 . +.Xr update-crypto-policies 8 .
.Pp +.Pp
The list of available MAC algorithms may also be obtained using Specifies the key types that will be accepted for public key authentication
.Qq ssh -Q mac . as a list of comma-separated patterns.
@@ -1492,22 +1472,10 @@ If the specified list begins with a Alternately if the specified list begins with a
.Sq +
-character, then the specified key types will be appended to the default set
+character, then the specified key types will be appended to the built-in default set
instead of replacing them.
If the specified list begins with a
.Sq -
character, then the specified key types (including wildcards) will be removed
-from the default set instead of replacing them.
+from the built-in default set instead of replacing them.
If the specified list begins with a
.Sq ^ .Sq ^
character, then the specified key types will be placed at the head of the character, then the specified key types will be placed at the head of the
default set. -default set.
-The default for this option is: -The default for this option is:
-.Bd -literal -offset 3n -.Bd -literal -offset 3n
-ecdsa-sha2-nistp256-cert-v01@openssh.com, -ecdsa-sha2-nistp256-cert-v01@openssh.com,
@ -260,10 +488,7 @@ diff -up openssh/sshd_config.5.crypto-policies openssh/sshd_config.5
-ssh-ed25519,sk-ssh-ed25519@openssh.com, -ssh-ed25519,sk-ssh-ed25519@openssh.com,
-rsa-sha2-512,rsa-sha2-256,ssh-rsa -rsa-sha2-512,rsa-sha2-256,ssh-rsa
-.Ed -.Ed
+The default is handled system-wide by +built-in default set.
+.Xr crypto-policies 7 .
+To see the defaults and how to modify this default, see manual page
+.Xr update-crypto-policies 8 .
.Pp .Pp
The list of available key types may also be obtained using The list of available key types may also be obtained using
.Qq ssh -Q PubkeyAcceptedKeyTypes . .Qq ssh -Q PubkeyAcceptedKeyTypes .