1 files changed, 111 insertions, 0 deletions
diff --git a/sshsig.h b/sshsig.h
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+++ b/sshsig.h
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+/* $OpenBSD: sshsig.h,v 1.11 2021/11/27 07:14:46 djm Exp $ */
+/*
+ * Copyright (c) 2019 Google LLC
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef SSHSIG_H
+#define SSHSIG_H
+
+struct sshbuf;
+struct sshkey;
+struct sshsigopt;
+struct sshkey_sig_details;
+
+typedef int sshsig_signer(struct sshkey *, u_char **, size_t *,
+    const u_char *, size_t, const char *, const char *, const char *,
+    u_int, void *);
+
+/* Buffer-oriented API */
+
+/*
+ * Creates a detached SSH signature for a given buffer.
+ * Returns 0 on success or a negative SSH_ERR_* error code on failure.
+ * out is populated with the detached signature, or NULL on failure.
+ */
+int sshsig_signb(struct sshkey *key, const char *hashalg,
+    const char *sk_provider, const char *sk_pin, const struct sshbuf *message,
+    const char *sig_namespace, struct sshbuf **out,
+    sshsig_signer *signer, void *signer_ctx);
+
+/*
+ * Verifies that a detached signature is valid and optionally returns key
+ * used to sign via argument.
+ * Returns 0 on success or a negative SSH_ERR_* error code on failure.
+ */
+int sshsig_verifyb(struct sshbuf *signature,
+    const struct sshbuf *message, const char *sig_namespace,
+    struct sshkey **sign_keyp, struct sshkey_sig_details **sig_details);
+
+/* File/FD-oriented API */
+
+/*
+ * Creates a detached SSH signature for a given file.
+ * Returns 0 on success or a negative SSH_ERR_* error code on failure.
+ * out is populated with the detached signature, or NULL on failure.
+ */
+int sshsig_sign_fd(struct sshkey *key, const char *hashalg,
+    const char *sk_provider, const char *sk_pin,
+    int fd, const char *sig_namespace,
+    struct sshbuf **out, sshsig_signer *signer, void *signer_ctx);
+
+/*
+ * Verifies that a detached signature over a file is valid and optionally
+ * returns key used to sign via argument.
+ * Returns 0 on success or a negative SSH_ERR_* error code on failure.
+ */
+int sshsig_verify_fd(struct sshbuf *signature, int fd,
+    const char *sig_namespace, struct sshkey **sign_keyp,
+    struct sshkey_sig_details **sig_details);
+
+/* Utility functions */
+
+/*
+ * Return a base64 encoded "ASCII armoured" version of a raw signature.
+ */
+int sshsig_armor(const struct sshbuf *blob, struct sshbuf **out);
+
+/*
+ * Decode a base64 encoded armoured signature to a raw signature.
+ */
+int sshsig_dearmor(struct sshbuf *sig, struct sshbuf **out);
+
+/*
+ * Checks whether a particular key/principal/namespace is permitted by
+ * an allowed_keys file. Returns 0 on success.
+ */
+int sshsig_check_allowed_keys(const char *path, const struct sshkey *sign_key,
+    const char *principal, const char *ns, uint64_t verify_time);
+
+/* Parse zero or more allowed_keys signature options */
+struct sshsigopt *sshsigopt_parse(const char *opts,
+    const char *path, u_long linenum, const char **errstrp);
+
+/* Free signature options */
+void sshsigopt_free(struct sshsigopt *opts);
+
+/* Get public key from signature */
+int sshsig_get_pubkey(struct sshbuf *signature, struct sshkey **pubkey);
+
+/* Find principal in allowed_keys file, given a sshkey. Returns
+ * 0 on success.
+ */
+int sshsig_find_principals(const char *path, const struct sshkey *sign_key,
+    uint64_t verify_time, char **principal);
+
+/* Find all principals in allowed_keys file matching *principal */
+int sshsig_match_principals(const char *path,
+	const char *principal, char ***principalsp, size_t *nprincipalsp);
+
+#endif /* SSHSIG_H */