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/** \ingroup signature
* \file lib/signature.c
*/
#include "system.h"
#include <inttypes.h>
#include <netinet/in.h>
#include <rpm/rpmtypes.h>
#include <rpm/rpmstring.h>
#include <rpm/rpmfileutil.h>
#include <rpm/rpmlog.h>
#include <rpm/rpmmacro.h>
#include "lib/rpmlead.h"
#include "lib/header_internal.h"
#include "lib/signature.h"
#include "debug.h"
/**
* Print package size (debug purposes only)
* @param fd package file handle
* @param sigh signature header
*/
static void printSize(FD_t fd, Header sigh)
{
struct stat st;
int fdno = Fileno(fd);
size_t siglen = headerSizeof(sigh, HEADER_MAGIC_YES);
size_t pad = (8 - (siglen % 8)) % 8; /* 8-byte pad */
struct rpmtd_s sizetag;
rpm_loff_t datalen = 0;
/* Print package component sizes. */
if (headerGet(sigh, RPMSIGTAG_LONGSIZE, &sizetag, HEADERGET_DEFAULT)) {
rpm_loff_t *tsize = rpmtdGetUint64(&sizetag);
datalen = (tsize) ? *tsize : 0;
} else if (headerGet(sigh, RPMSIGTAG_SIZE, &sizetag, HEADERGET_DEFAULT)) {
rpm_off_t *tsize = rpmtdGetUint32(&sizetag);
datalen = (tsize) ? *tsize : 0;
}
rpmtdFreeData(&sizetag);
rpmlog(RPMLOG_DEBUG,
"Expected size: %12" PRIu64 \
" = lead(%d)+sigs(%zd)+pad(%zd)+data(%" PRIu64 ")\n",
RPMLEAD_SIZE+siglen+pad+datalen,
RPMLEAD_SIZE, siglen, pad, datalen);
if (fstat(fdno, &st) == 0) {
rpmlog(RPMLOG_DEBUG,
" Actual size: %12" PRIu64 "\n", (rpm_loff_t) st.st_size);
}
}
rpmRC rpmReadSignature(FD_t fd, Header * sighp, char ** msg)
{
char *buf = NULL;
struct hdrblob_s blob;
Header sigh = NULL;
rpmRC rc = RPMRC_FAIL; /* assume failure */
if (sighp)
*sighp = NULL;
if (hdrblobRead(fd, 1, 1, RPMTAG_HEADERSIGNATURES, &blob, &buf) != RPMRC_OK)
goto exit;
/* OK, blob looks sane, load the header. */
if (hdrblobImport(&blob, 0, &sigh, &buf) != RPMRC_OK)
goto exit;
printSize(fd, sigh);
rc = RPMRC_OK;
exit:
if (sighp && sigh && rc == RPMRC_OK)
*sighp = headerLink(sigh);
headerFree(sigh);
if (msg != NULL) {
*msg = buf;
} else {
free(buf);
}
return rc;
}
int rpmWriteSignature(FD_t fd, Header sigh)
{
static const uint8_t zeros[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
int sigSize, pad;
int rc;
rc = headerWrite(fd, sigh, HEADER_MAGIC_YES);
if (rc)
return rc;
sigSize = headerSizeof(sigh, HEADER_MAGIC_YES);
pad = (8 - (sigSize % 8)) % 8;
if (pad) {
if (Fwrite(zeros, sizeof(zeros[0]), pad, fd) != pad)
rc = 1;
}
rpmlog(RPMLOG_DEBUG, "Signature: size(%d)+pad(%d)\n", sigSize, pad);
return rc;
}
rpmRC rpmGenerateSignature(char *SHA256, char *SHA1, uint8_t *MD5,
rpm_loff_t size, rpm_loff_t payloadSize, FD_t fd)
{
Header sig = headerNew();
struct rpmtd_s td;
rpmRC rc = RPMRC_OK;
char *reservedSpace;
int spaceSize = 32; /* always reserve a bit of space */
int gpgSize = rpmExpandNumeric("%{__gpg_reserved_space}");
rpm_off_t size32 = size;
rpm_off_t payloadSize32 = payloadSize;
/* Prepare signature */
if (SHA256) {
rpmtdReset(&td);
td.tag = RPMSIGTAG_SHA256;
td.count = 1;
td.type = RPM_STRING_TYPE;
td.data = SHA256;
headerPut(sig, &td, HEADERPUT_DEFAULT);
}
if (SHA1) {
rpmtdReset(&td);
td.tag = RPMSIGTAG_SHA1;
td.count = 1;
td.type = RPM_STRING_TYPE;
td.data = SHA1;
headerPut(sig, &td, HEADERPUT_DEFAULT);
}
if (MD5) {
rpmtdReset(&td);
td.tag = RPMSIGTAG_MD5;
td.count = 16;
td.type = RPM_BIN_TYPE;
td.data = MD5;
headerPut(sig, &td, HEADERPUT_DEFAULT);
}
rpmtdReset(&td);
td.count = 1;
td.type = RPM_INT32_TYPE;
td.tag = RPMSIGTAG_PAYLOADSIZE;
td.data = &payloadSize32;
headerPut(sig, &td, HEADERPUT_DEFAULT);
td.tag = RPMSIGTAG_SIZE;
td.data = &size32;
headerPut(sig, &td, HEADERPUT_DEFAULT);
if (size >= UINT32_MAX || payloadSize >= UINT32_MAX) {
/*
* Put the 64bit size variants into the header, but
* modify spaceSize so that the resulting header has
* the same size. Note that this only works if all tags
* with a lower number than RPMSIGTAG_RESERVEDSPACE are
* already added and no tag with a higher number is
* added yet.
*/
rpm_loff_t p = payloadSize;
rpm_loff_t s = size;
int newsigSize, oldsigSize;
oldsigSize = headerSizeof(sig, HEADER_MAGIC_YES);
headerDel(sig, RPMSIGTAG_PAYLOADSIZE);
headerDel(sig, RPMSIGTAG_SIZE);
td.type = RPM_INT64_TYPE;
td.tag = RPMSIGTAG_LONGARCHIVESIZE;
td.data = &p;
headerPut(sig, &td, HEADERPUT_DEFAULT);
td.tag = RPMSIGTAG_LONGSIZE;
td.data = &s;
headerPut(sig, &td, HEADERPUT_DEFAULT);
newsigSize = headerSizeof(sig, HEADER_MAGIC_YES);
spaceSize -= newsigSize - oldsigSize;
}
if (gpgSize > 0)
spaceSize += gpgSize;
if (spaceSize > 0) {
reservedSpace = xcalloc(spaceSize, sizeof(char));
rpmtdReset(&td);
td.tag = RPMSIGTAG_RESERVEDSPACE;
td.count = spaceSize;
td.type = RPM_BIN_TYPE;
td.data = reservedSpace;
headerPut(sig, &td, HEADERPUT_DEFAULT);
free(reservedSpace);
}
/* Reallocate the signature into one contiguous region. */
sig = headerReload(sig, RPMTAG_HEADERSIGNATURES);
if (sig == NULL) { /* XXX can't happen */
rpmlog(RPMLOG_ERR, _("Unable to reload signature header.\n"));
rc = RPMRC_FAIL;
goto exit;
}
/* Write the signature section into the package. */
if (rpmWriteSignature(fd, sig)) {
rc = RPMRC_FAIL;
goto exit;
}
exit:
headerFree(sig);
return rc;
}
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