mirror of
https://github.com/git/git.git
synced 2024-12-14 04:18:16 +08:00
6794898198
This commit refactors the use of verify_signed_buffer() outside of gpg-interface.c to use check_signature() instead. It also turns verify_signed_buffer() into a file-local function since it's now only invoked internally by check_signature(). There were previously two globally scoped functions used in different parts of Git to perform GPG signature verification: verify_signed_buffer() and check_signature(). Now only check_signature() is used. The verify_signed_buffer() function doesn't guard against duplicate signatures as described by Michał Górny [1]. Instead it only ensures a non-erroneous exit code from GPG and the presence of at least one GOODSIG status field. This stands in contrast with check_signature() that returns an error if more than one signature is encountered. The lower degree of verification makes the use of verify_signed_buffer() problematic if callers don't parse and validate the various parts of the GPG status message themselves. And processing these messages seems like a task that should be reserved to gpg-interface.c with the function check_signature(). Furthermore, the use of verify_signed_buffer() makes it difficult to introduce new functionality that relies on the content of the GPG status lines. Now all operations that does signature verification share a single entry point to gpg-interface.c. This makes it easier to propagate changed or additional functionality in GPG signature verification to all parts of Git, without having odd edge-cases that don't perform the same degree of verification. [1] https://dev.gentoo.org/~mgorny/articles/attack-on-git-signature-verification.html Signed-off-by: Hans Jerry Illikainen <hji@dyntopia.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
#ifndef GPG_INTERFACE_H
|
|
#define GPG_INTERFACE_H
|
|
|
|
struct strbuf;
|
|
|
|
#define GPG_VERIFY_VERBOSE 1
|
|
#define GPG_VERIFY_RAW 2
|
|
#define GPG_VERIFY_OMIT_STATUS 4
|
|
|
|
enum signature_trust_level {
|
|
TRUST_UNDEFINED,
|
|
TRUST_NEVER,
|
|
TRUST_MARGINAL,
|
|
TRUST_FULLY,
|
|
TRUST_ULTIMATE,
|
|
};
|
|
|
|
struct signature_check {
|
|
char *payload;
|
|
char *gpg_output;
|
|
char *gpg_status;
|
|
|
|
/*
|
|
* possible "result":
|
|
* 0 (not checked)
|
|
* N (checked but no further result)
|
|
* G (good)
|
|
* B (bad)
|
|
*/
|
|
char result;
|
|
char *signer;
|
|
char *key;
|
|
char *fingerprint;
|
|
char *primary_key_fingerprint;
|
|
enum signature_trust_level trust_level;
|
|
};
|
|
|
|
void signature_check_clear(struct signature_check *sigc);
|
|
|
|
/*
|
|
* Look at GPG signed content (e.g. a signed tag object), whose
|
|
* payload is followed by a detached signature on it. Return the
|
|
* offset where the embedded detached signature begins, or the end of
|
|
* the data when there is no such signature.
|
|
*/
|
|
size_t parse_signature(const char *buf, size_t size);
|
|
|
|
/*
|
|
* Create a detached signature for the contents of "buffer" and append
|
|
* it after "signature"; "buffer" and "signature" can be the same
|
|
* strbuf instance, which would cause the detached signature appended
|
|
* at the end.
|
|
*/
|
|
int sign_buffer(struct strbuf *buffer, struct strbuf *signature,
|
|
const char *signing_key);
|
|
|
|
int git_gpg_config(const char *, const char *, void *);
|
|
void set_signing_key(const char *);
|
|
const char *get_signing_key(void);
|
|
int check_signature(const char *payload, size_t plen,
|
|
const char *signature, size_t slen,
|
|
struct signature_check *sigc);
|
|
void print_signature_buffer(const struct signature_check *sigc,
|
|
unsigned flags);
|
|
|
|
#endif
|