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sshsig.h
1 /* $OpenBSD: sshsig.h,v 1.9 2020/08/31 00:17:41 djm Exp $ */
2 /*
3  * Copyright (c) 2019 Google LLC
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #ifndef SSHSIG_H
19 #define SSHSIG_H
20 
21 struct sshbuf;
22 struct sshkey;
23 struct sshsigopt;
24 struct sshkey_sig_details;
25 
26 typedef int sshsig_signer(struct sshkey *, u_char **, size_t *,
27  const u_char *, size_t, const char *, const char *, const char *,
28  u_int, void *);
29 
30 /* Buffer-oriented API */
31 
32 /*
33  * Creates a detached SSH signature for a given buffer.
34  * Returns 0 on success or a negative SSH_ERR_* error code on failure.
35  * out is populated with the detached signature, or NULL on failure.
36  */
37 int sshsig_signb(struct sshkey *key, const char *hashalg,
38  const char *sk_provider, const char *sk_pin, const struct sshbuf *message,
39  const char *sig_namespace, struct sshbuf **out,
40  sshsig_signer *signer, void *signer_ctx);
41 
42 /*
43  * Verifies that a detached signature is valid and optionally returns key
44  * used to sign via argument.
45  * Returns 0 on success or a negative SSH_ERR_* error code on failure.
46  */
47 int sshsig_verifyb(struct sshbuf *signature,
48  const struct sshbuf *message, const char *sig_namespace,
49  struct sshkey **sign_keyp, struct sshkey_sig_details **sig_details);
50 
51 /* File/FD-oriented API */
52 
53 /*
54  * Creates a detached SSH signature for a given file.
55  * Returns 0 on success or a negative SSH_ERR_* error code on failure.
56  * out is populated with the detached signature, or NULL on failure.
57  */
58 int sshsig_sign_fd(struct sshkey *key, const char *hashalg,
59  const char *sk_provider, const char *sk_pin,
60  int fd, const char *sig_namespace,
61  struct sshbuf **out, sshsig_signer *signer, void *signer_ctx);
62 
63 /*
64  * Verifies that a detached signature over a file is valid and optionally
65  * returns key used to sign via argument.
66  * Returns 0 on success or a negative SSH_ERR_* error code on failure.
67  */
68 int sshsig_verify_fd(struct sshbuf *signature, int fd,
69  const char *sig_namespace, struct sshkey **sign_keyp,
70  struct sshkey_sig_details **sig_details);
71 
72 /* Utility functions */
73 
74 /*
75  * Return a base64 encoded "ASCII armoured" version of a raw signature.
76  */
77 int sshsig_armor(const struct sshbuf *blob, struct sshbuf **out);
78 
79 /*
80  * Decode a base64 encoded armoured signature to a raw signature.
81  */
82 int sshsig_dearmor(struct sshbuf *sig, struct sshbuf **out);
83 
84 /*
85  * Checks whether a particular key/principal/namespace is permitted by
86  * an allowed_keys file. Returns 0 on success.
87  */
88 int sshsig_check_allowed_keys(const char *path, const struct sshkey *sign_key,
89  const char *principal, const char *ns);
90 
91 /* Parse zero or more allowed_keys signature options */
92 struct sshsigopt *sshsigopt_parse(const char *opts,
93  const char *path, u_long linenum, const char **errstrp);
94 
95 /* Free signature options */
96 void sshsigopt_free(struct sshsigopt *opts);
97 
98 /* Get public key from signature */
99 int sshsig_get_pubkey(struct sshbuf *signature, struct sshkey **pubkey);
100 
101 /* Find principal in allowed_keys file, given a sshkey. Returns
102  * 0 on success.
103  */
104 int sshsig_find_principals(const char *path, const struct sshkey *sign_key,
105  char **principal);
106 
107 #endif /* SSHSIG_H */