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signing: delay gpgme_init() until latest possible moment 

In the default configuration, we can enter the signing code but still
have nothing to do with GPGME- for example, if database signatures are
optional but none are present. Delay initialization of GPGME until we
know there is a signature file present or we were passed base64-encoded
data.

This also makes debugging with valgrind a lot easier as you don't have
to deal with all the GPGME error noise because their code leaks like a
sieve.

Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Dan McGee 2011-10-03 10:52:16 -05:00
parent 61c6ae01b3
commit 2a18171afa
1 changed files with 27 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
lib/libalpm/signing.c
View File

@ -370,7 +370,7 @@ int _alpm_gpgme_checksig(alpm_handle_t *handle, const char *path,
const char *base64_sig, alpm_siglist_t *siglist)
{
int ret = -1, sigcount;
gpgme_error_t err;
gpgme_error_t err = 0;
gpgme_ctx_t ctx;
gpgme_data_t filedata, sigdata;
gpgme_verify_result_t verify_result;
@ -394,9 +394,27 @@ int _alpm_gpgme_checksig(alpm_handle_t *handle, const char *path,
_alpm_access(handle, NULL, sigpath, R_OK);
}
/* does the file we are verifying exist? */
file = fopen(path, "rb");
if(file == NULL) {
handle->pm_errno = ALPM_ERR_NOT_A_FILE;
goto error;
}
/* does the sig file exist (if we didn't get the data directly)? */
if(!base64_sig) {
sigfile = fopen(sigpath, "rb");
if(sigfile == NULL) {
_alpm_log(handle, ALPM_LOG_DEBUG, "sig path %s could not be opened\n",
sigpath);
handle->pm_errno = ALPM_ERR_SIG_MISSING;
goto error;
}
}
if(init_gpgme(handle)) {
/* pm_errno was set in gpgme_init() */
return -1;
goto error;
}
_alpm_log(handle, ALPM_LOG_DEBUG, "checking signature for %s\n", path);
@ -409,11 +427,6 @@ int _alpm_gpgme_checksig(alpm_handle_t *handle, const char *path,
CHECK_ERR();
/* create our necessary data objects to verify the signature */
file = fopen(path, "rb");
if(file == NULL) {
handle->pm_errno = ALPM_ERR_NOT_A_FILE;
goto error;
}
err = gpgme_data_new_from_stream(&filedata, file);
CHECK_ERR();
@ -425,19 +438,12 @@ int _alpm_gpgme_checksig(alpm_handle_t *handle, const char *path,
&decoded_sigdata, &data_len);
if(decode_ret) {
handle->pm_errno = ALPM_ERR_SIG_INVALID;
goto error;
goto gpg_error;
}
err = gpgme_data_new_from_mem(&sigdata,
(char *)decoded_sigdata, data_len, 0);
} else {
/* file-based, it is on disk */
sigfile = fopen(sigpath, "rb");
if(sigfile == NULL) {
_alpm_log(handle, ALPM_LOG_DEBUG, "sig path %s could not be opened\n",
sigpath);
handle->pm_errno = ALPM_ERR_SIG_MISSING;
goto error;
}
err = gpgme_data_new_from_stream(&sigdata, sigfile);
}
CHECK_ERR();
@ -450,14 +456,14 @@ int _alpm_gpgme_checksig(alpm_handle_t *handle, const char *path,
if(!verify_result || !verify_result->signatures) {
_alpm_log(handle, ALPM_LOG_DEBUG, "no signatures returned\n");
handle->pm_errno = ALPM_ERR_SIG_MISSING;
goto error;
goto gpg_error;
}
for(gpgsig = verify_result->signatures, sigcount = 0;
gpgsig; gpgsig = gpgsig->next, sigcount++);
_alpm_log(handle, ALPM_LOG_DEBUG, "%d signatures returned\n", sigcount);
CALLOC(siglist->results, sigcount, sizeof(alpm_sigresult_t),
handle->pm_errno = ALPM_ERR_MEMORY; goto error);
handle->pm_errno = ALPM_ERR_MEMORY; goto gpg_error);
siglist->count = sigcount;
for(gpgsig = verify_result->signatures, sigcount = 0; gpgsig;
@ -488,7 +494,7 @@ int _alpm_gpgme_checksig(alpm_handle_t *handle, const char *path,
err = GPG_ERR_NO_ERROR;
/* we dupe the fpr in this case since we have no key to point at */
STRDUP(result->key.fingerprint, gpgsig->fpr,
handle->pm_errno = ALPM_ERR_MEMORY; goto error);
handle->pm_errno = ALPM_ERR_MEMORY; goto gpg_error);
} else {
CHECK_ERR();
if(key->uids) {
@ -555,10 +561,12 @@ int _alpm_gpgme_checksig(alpm_handle_t *handle, const char *path,
ret = 0;
error:
gpg_error:
gpgme_data_release(sigdata);
gpgme_data_release(filedata);
gpgme_release(ctx);
error:
if(sigfile) {
fclose(sigfile);
}