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2a9c9f7272
for OpenSSH This adds a simple manual signature scheme to OpenSSH. Signatures can be made and verified using ssh-keygen -Y sign|verify Signatures embed the key used to make them. At verification time, this is matched via principal name against an authorized_keys-like list of allowed signers. Mostly by Sebastian Kinne w/ some tweaks by me ok markus@ OpenBSD-Commit-ID: 2ab568e7114c933346616392579d72be65a4b8fb
79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
/*
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* Copyright (c) 2019 Google LLC
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef SSHSIG_H
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#define SSHSIG_H
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struct sshbuf;
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struct sshkey;
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typedef int sshsig_signer(struct sshkey *, u_char **, size_t *,
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const u_char *, size_t, const char *, u_int, void *);
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/*
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* Creates a detached SSH signature for a given message.
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* Returns 0 on success or a negative SSH_ERR_* error code on failure.
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* out is populated with the detached signature, or NULL on failure.
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*/
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int sshsig_sign_message(struct sshkey *key, const char *hashalg,
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const struct sshbuf *message, const char *sig_namespace,
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struct sshbuf **out, sshsig_signer *signer, void *signer_ctx);
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/*
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* Creates a detached SSH signature for a given file.
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* Returns 0 on success or a negative SSH_ERR_* error code on failure.
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* out is populated with the detached signature, or NULL on failure.
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*/
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int sshsig_sign_fd(struct sshkey *key, const char *hashalg,
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int fd, const char *sig_namespace, struct sshbuf **out,
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sshsig_signer *signer, void *signer_ctx);
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/*
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* Verifies that a detached signature is valid and optionally returns key
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* used to sign via argument.
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* Returns 0 on success or a negative SSH_ERR_* error code on failure.
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*/
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int sshsig_verify_message(struct sshbuf *signature,
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const struct sshbuf *message, const char *sig_namespace,
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struct sshkey **sign_keyp);
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/*
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* Verifies that a detached signature over a file is valid and optionally
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* returns key used to sign via argument.
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* Returns 0 on success or a negative SSH_ERR_* error code on failure.
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*/
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int sshsig_verify_fd(struct sshbuf *signature, int fd,
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const char *sig_namespace, struct sshkey **sign_keyp);
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/*
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* Return a base64 encoded "ASCII armoured" version of a raw signature.
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*/
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int sshsig_armor(const struct sshbuf *blob, struct sshbuf **out);
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/*
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* Decode a base64 encoded armoured signature to a raw signature.
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*/
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int sshsig_dearmor(struct sshbuf *sig, struct sshbuf **out);
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/*
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* Checks whether a particular key/principal/namespace is permitted by
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* an allowed_keys file. Returns 0 on success.
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*/
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int sshsig_check_allowed_keys(const char *path, const struct sshkey *sign_key,
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const char *principal, const char *ns);
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#endif /* SSHSIG_H */
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