Implement Elliptic Curve Cryptography modes for key exchange (ECDH) and
host/user keys (ECDSA) as specified by RFC5656. ECDH and ECDSA offer
better performance than plain DH and DSA at the same equiv

Implement Elliptic Curve Cryptography modes for key exchange (ECDH) and
host/user keys (ECDSA) as specified by RFC5656. ECDH and ECDSA offer
better performance than plain DH and DSA at the same equivalent symmetric
key length, as well as much shorter keys.

Only the mandatory sections of RFC5656 are implemented, specifically the
three REQUIRED curves nistp256, nistp384 and nistp521 and only ECDH and
ECDSA. Point compression (optional in RFC5656 is NOT implemented).

Certificate host and user keys using the new ECDSA key types are supported.

Note that this code has not been tested for interoperability and may be
subject to change.

feedback and ok markus@

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revised certificate format ssh-{dss,rsa}-cert-v01@openssh.com with the
following changes:

move the nonce field to the beginning of the certificate where it can
better protect against chosen-prefix a

revised certificate format ssh-{dss,rsa}-cert-v01@openssh.com with the
following changes:

move the nonce field to the beginning of the certificate where it can
better protect against chosen-prefix attacks on the signature hash

Rename "constraints" field to "critical options"

Add a new non-critical "extensions" field

Add a serial number

The older format is still support for authentication and cert generation
(use "ssh-keygen -t v00 -s ca_key ..." to generate a v00 certificate)

ok markus@

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Add support for certificate key types for users and hosts.

OpenSSH certificate key types are not X.509 certificates, but a much
simpler format that encodes a public key, identity information and
som

Add support for certificate key types for users and hosts.

OpenSSH certificate key types are not X.509 certificates, but a much
simpler format that encodes a public key, identity information and
some validity constraints and signs it with a CA key. CA keys are
regular SSH keys. This certificate style avoids the attack surface
of X.509 certificates and is very easy to deploy.

Certified host keys allow automatic acceptance of new host keys
when a CA certificate is marked as trusted in ~/.ssh/known_hosts.
see VERIFYING HOST KEYS in ssh(1) for details.

Certified user keys allow authentication of users when the signing
CA key is marked as trusted in authorized_keys. See "AUTHORIZED_KEYS
FILE FORMAT" in sshd(8) for details.

Certificates are minted using ssh-keygen(1), documentation is in
the "CERTIFICATES" section of that manpage.

Documentation on the format of certificates is in the file
PROTOCOL.certkeys

feedback and ok markus@

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Do not fall back to adding keys without contraints (ssh-add -c / -t ...)
when the agent refuses the constrained add request. This was a useful
migration measure back in 2002 when constraints were new

Do not fall back to adding keys without contraints (ssh-add -c / -t ...)
when the agent refuses the constrained add request. This was a useful
migration measure back in 2002 when constraints were new, but just
adds risk now.

bz #1612, report and patch from dkg AT fifthhorseman.net; ok markus@

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almost entirely get rid of the culture of ".h files that include .h files"
ok djm, sort of ok stevesk
makes the pain stop in one easy step

move #include <stdlib.h> out of includes.h

move #include <string.h> out of includes.h

move #include <unistd.h> out of includes.h

move #include <fcntl.h> out of includes.h

move #include <sys/socket.h> out of includes.h

replace {GET,PUT}_XXBIT macros with functionally similar functions,
silencing a heap of lint warnings. also allows them to use
__bounded__ checking which can't be applied to macros; requested
by and

replace {GET,PUT}_XXBIT macros with functionally similar functions,
silencing a heap of lint warnings. also allows them to use
__bounded__ checking which can't be applied to macros; requested
by and feedback from deraadt@

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needed casts (always will be needed)

Put $OpenBSD$ tags back (as comments) to replace the RCSID()s that
Theo nuked - our scripts to sync -portable need them in the files

spacing

RCSID() can die

another unreachable found by lint

unreachanble statement, found by lint

move #include <sys/un.h> out of includes.h; ok djm@

make this -Wsign-compare clean; ok avsm@ markus@

Switch atomicio to use a simpler interface; it now returns a size_t
(containing number of bytes read/written), and indicates error by
returning 0. EOF is signalled by errno==EPIPE.
Typical use now b

Switch atomicio to use a simpler interface; it now returns a size_t
(containing number of bytes read/written), and indicates error by
returning 0. EOF is signalled by errno==EPIPE.
Typical use now becomes:

if (atomicio(read, ..., len) != len)
err(1,"read");

ok deraadt@, cloder@, djm@

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use atomicio instead of homegrown equivalents or read/write.
markus@ ok

unexpand and delete whitespace at EOL; ok markus@

A few signedness fixes for harmless situations; markus@ ok

deal with typing of write vs read in atomicio

make agent constraints (lifetime, confirm) work with smartcard keys; ok markus@