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![Junio C Hamano](/assets/img/avatar_default.png)
The function used to take an integer flag to specify where the output should go, but these days we supply a strbuf to receive it. Signed-off-by: Junio C Hamano <gitster@pobox.com>
141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include "strbuf.h"
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#include "gpg-interface.h"
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#include "sigchain.h"
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static char *configured_signing_key;
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static const char *gpg_program = "gpg";
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void set_signing_key(const char *key)
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{
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free(configured_signing_key);
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configured_signing_key = xstrdup(key);
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}
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int git_gpg_config(const char *var, const char *value, void *cb)
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{
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if (!strcmp(var, "user.signingkey")) {
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set_signing_key(value);
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}
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if (!strcmp(var, "gpg.program")) {
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if (!value)
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return config_error_nonbool(var);
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gpg_program = xstrdup(value);
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}
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return 0;
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}
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const char *get_signing_key(void)
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{
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if (configured_signing_key)
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return configured_signing_key;
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return git_committer_info(IDENT_ERROR_ON_NO_NAME|IDENT_NO_DATE);
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}
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/*
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* Create a detached signature for the contents of "buffer" and append
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* it after "signature"; "buffer" and "signature" can be the same
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* strbuf instance, which would cause the detached signature appended
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* at the end.
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*/
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int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key)
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{
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struct child_process gpg;
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const char *args[4];
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ssize_t len;
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size_t i, j, bottom;
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memset(&gpg, 0, sizeof(gpg));
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gpg.argv = args;
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gpg.in = -1;
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gpg.out = -1;
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args[0] = gpg_program;
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args[1] = "-bsau";
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args[2] = signing_key;
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args[3] = NULL;
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if (start_command(&gpg))
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return error(_("could not run gpg."));
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/*
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* When the username signingkey is bad, program could be terminated
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* because gpg exits without reading and then write gets SIGPIPE.
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*/
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sigchain_push(SIGPIPE, SIG_IGN);
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if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
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close(gpg.in);
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close(gpg.out);
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finish_command(&gpg);
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return error(_("gpg did not accept the data"));
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}
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close(gpg.in);
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bottom = signature->len;
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len = strbuf_read(signature, gpg.out, 1024);
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close(gpg.out);
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sigchain_pop(SIGPIPE);
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if (finish_command(&gpg) || !len || len < 0)
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return error(_("gpg failed to sign the data"));
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/* Strip CR from the line endings, in case we are on Windows. */
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for (i = j = bottom; i < signature->len; i++)
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if (signature->buf[i] != '\r') {
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if (i != j)
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signature->buf[j] = signature->buf[i];
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j++;
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}
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strbuf_setlen(signature, j);
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return 0;
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}
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/*
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* Run "gpg" to see if the payload matches the detached signature.
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* gpg_output, when set, receives the diagnostic output from GPG.
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*/
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int verify_signed_buffer(const char *payload, size_t payload_size,
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const char *signature, size_t signature_size,
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struct strbuf *gpg_output)
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{
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struct child_process gpg;
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const char *args_gpg[] = {NULL, "--verify", "FILE", "-", NULL};
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char path[PATH_MAX];
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int fd, ret;
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args_gpg[0] = gpg_program;
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fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX");
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if (fd < 0)
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return error("could not create temporary file '%s': %s",
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path, strerror(errno));
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if (write_in_full(fd, signature, signature_size) < 0)
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return error("failed writing detached signature to '%s': %s",
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path, strerror(errno));
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close(fd);
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memset(&gpg, 0, sizeof(gpg));
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gpg.argv = args_gpg;
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gpg.in = -1;
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if (gpg_output)
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gpg.err = -1;
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args_gpg[2] = path;
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if (start_command(&gpg)) {
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unlink(path);
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return error("could not run gpg.");
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}
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write_in_full(gpg.in, payload, payload_size);
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close(gpg.in);
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if (gpg_output)
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strbuf_read(gpg_output, gpg.err, 0);
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ret = finish_command(&gpg);
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unlink_or_warn(path);
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return ret;
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}
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