rpmRC headerCheck(rpmts ts, const void * uh, size_t uc, char ** msg)
{
rpmRC rc = RPMRC_FAIL;
rpmVSFlags vsflags = rpmtsVSFlags(ts);
rpmKeyring keyring = rpmtsGetKeyring(ts, 1);
struct hdrblob_s blob;
if (hdrblobInit(uh, uc, 0, 0, &blob, msg) == RPMRC_OK) {
rpmswEnter(rpmtsOp(ts, RPMTS_OP_DIGEST), 0);
rc = headerSigVerify(keyring, vsflags, &blob, msg);
rpmswExit(rpmtsOp(ts, RPMTS_OP_DIGEST), uc);
if (rc == RPMRC_NOTFOUND && msg != NULL && *msg == NULL)
rasprintf(msg, "Header sanity check: OK");
}
rpmKeyringFree(keyring);
return rc;
}
static rpmRC headerVerify(rpmKeyring keyring, rpmVSFlags vsflags,
const void * uh, size_t uc, char ** msg)
{
char *buf = NULL;
int32_t * ei = (int32_t *) uh;
int32_t il = ntohl(ei[0]);
int32_t dl = ntohl(ei[1]);
entryInfo pe = (entryInfo) &ei[2];
int32_t pvlen = sizeof(il) + sizeof(dl) + (il * sizeof(*pe)) + dl;
unsigned char * dataStart = (unsigned char *) (pe + il);
struct indexEntry_s entry;
struct entryInfo_s info;
int32_t ril = 0;
unsigned char * regionEnd = NULL;
rpmRC rc = RPMRC_FAIL; /* assume failure */
/* Is the blob the right size? */
if (uc > 0 && pvlen != uc) {
rasprintf(&buf, _("blob size(%d): BAD, 8 + 16 * il(%d) + dl(%d)\n"),
(int)uc, (int)il, (int)dl);
goto exit;
}
memset(&entry, 0, sizeof(entry));
memset(&info, 0, sizeof(info));
/* Check (and convert) the 1st tag element. */
if (headerVerifyInfo(1, dl, pe, &entry.info, 0) != -1) {
rasprintf(&buf, _("tag[%d]: BAD, tag %d type %d offset %d count %d\n"),
0, entry.info.tag, entry.info.type,
entry.info.offset, entry.info.count);
goto exit;
}
/* Is there an immutable header region tag? */
if (!(entry.info.tag == RPMTAG_HEADERIMMUTABLE
&& entry.info.type == RPM_BIN_TYPE
&& entry.info.count == REGION_TAG_COUNT))
{
rc = RPMRC_NOTFOUND;
goto exit;
}
/* Is the trailer within the data area? */
if (entry.info.offset + REGION_TAG_COUNT > dl) {
rasprintf(&buf,
_("region offset: BAD, tag %d type %d offset %d count %d\n"),
entry.info.tag, entry.info.type,
entry.info.offset, entry.info.count);
goto exit;
}
/* Is there an immutable header region tag trailer? */
regionEnd = dataStart + entry.info.offset;
(void) memcpy(&info, regionEnd, REGION_TAG_COUNT);
regionEnd += REGION_TAG_COUNT;
if (headerVerifyInfo(1, dl, &info, &entry.info, 1) != -1 ||
!(entry.info.tag == RPMTAG_HEADERIMMUTABLE
&& entry.info.type == RPM_BIN_TYPE
&& entry.info.count == REGION_TAG_COUNT))
{
rasprintf(&buf,
_("region trailer: BAD, tag %d type %d offset %d count %d\n"),
entry.info.tag, entry.info.type,
entry.info.offset, entry.info.count);
goto exit;
}
memset(&info, 0, sizeof(info));
/* Is the no. of tags in the region less than the total no. of tags? */
ril = entry.info.offset/sizeof(*pe);
if ((entry.info.offset % sizeof(*pe)) || ril > il) {
rasprintf(&buf, _("region size: BAD, ril(%d) > il(%d)\n"), ril, il);
goto exit;
}
/* Verify header-only digest/signature if there is one we can use. */
rc = headerSigVerify(keyring, vsflags,
il, dl, ril, (regionEnd - dataStart),
pe, dataStart, &buf);
exit:
/* If no header-only digest/signature, then do simple sanity check. */
if (rc == RPMRC_NOTFOUND) {
int xx = headerVerifyInfo(ril-1, dl, pe+1, &entry.info, 0);
if (xx != -1) {
rasprintf(&buf,
_("tag[%d]: BAD, tag %d type %d offset %d count %d\n"),
xx+1, entry.info.tag, entry.info.type,
entry.info.offset, entry.info.count);
rc = RPMRC_FAIL;
} else {
rasprintf(&buf, "Header sanity check: OK\n");
rc = RPMRC_OK;
}
}
if (msg)
*msg = buf;
else
free(buf);
return rc;
}