536 lines
13 KiB
C
536 lines
13 KiB
C
/** \ingroup signature
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* \file lib/signature.c
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*/
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#include "system.h"
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#include <inttypes.h>
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#include <netinet/in.h>
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#include <rpm/rpmtypes.h>
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#include <rpm/rpmstring.h>
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#include <rpm/rpmfileutil.h>
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#include <rpm/rpmlog.h>
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#include <rpm/rpmkeyring.h>
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#include "lib/rpmlead.h"
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#include "lib/signature.h"
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#include "lib/header_internal.h"
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#include "debug.h"
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/* Dumb wrapper around headerPut() for signature header */
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static int sighdrPut(Header h, rpmTagVal tag, rpmTagType type,
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rpm_data_t p, rpm_count_t c)
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{
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struct rpmtd_s sigtd;
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rpmtdReset(&sigtd);
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sigtd.tag = tag;
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sigtd.type = type;
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sigtd.data = p;
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sigtd.count = c;
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return headerPut(h, &sigtd, HEADERPUT_DEFAULT);
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}
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/**
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* Print package size.
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* @todo rpmio: use fdSize rather than fstat(2) to get file size.
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* @param fd package file handle
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* @param siglen signature header size
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* @param pad signature padding
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* @param datalen length of header+payload
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* @return rpmRC return code
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*/
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static inline rpmRC printSize(FD_t fd, size_t siglen, size_t pad, rpm_loff_t datalen)
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{
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struct stat st;
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int fdno = Fileno(fd);
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if (fstat(fdno, &st) < 0)
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return RPMRC_FAIL;
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rpmlog(RPMLOG_DEBUG,
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"Expected size: %12" PRIu64 \
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" = lead(%d)+sigs(%zd)+pad(%zd)+data(%" PRIu64 ")\n",
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RPMLEAD_SIZE+siglen+pad+datalen,
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RPMLEAD_SIZE, siglen, pad, datalen);
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rpmlog(RPMLOG_DEBUG,
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" Actual size: %12" PRIu64 "\n", (rpm_loff_t) st.st_size);
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return RPMRC_OK;
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}
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rpmRC rpmReadSignature(FD_t fd, Header * sighp, sigType sig_type, char ** msg)
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{
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char *buf = NULL;
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int32_t block[4];
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int32_t il;
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int32_t dl;
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int32_t * ei = NULL;
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entryInfo pe;
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unsigned int nb, uc;
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int32_t ril = 0;
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struct indexEntry_s entry;
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struct entryInfo_s info;
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unsigned char * dataStart;
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unsigned char * dataEnd = NULL;
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Header sigh = NULL;
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rpmRC rc = RPMRC_FAIL; /* assume failure */
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int xx;
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int i;
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if (sighp)
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*sighp = NULL;
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if (sig_type != RPMSIGTYPE_HEADERSIG)
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goto exit;
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memset(block, 0, sizeof(block));
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if ((xx = Fread(block, 1, sizeof(block), fd)) != sizeof(block)) {
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rasprintf(&buf, _("sigh size(%d): BAD, read returned %d\n"),
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(int)sizeof(block), xx);
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goto exit;
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}
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if (memcmp(block, rpm_header_magic, sizeof(rpm_header_magic))) {
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rasprintf(&buf, _("sigh magic: BAD\n"));
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goto exit;
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}
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il = ntohl(block[2]);
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if (il < 0 || il > 32) {
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rasprintf(&buf,
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_("sigh tags: BAD, no. of tags(%d) out of range\n"), il);
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goto exit;
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}
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dl = ntohl(block[3]);
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if (dl < 0 || dl > 8192) {
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rasprintf(&buf,
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_("sigh data: BAD, no. of bytes(%d) out of range\n"), dl);
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goto exit;
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}
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memset(&entry, 0, sizeof(entry));
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memset(&info, 0, sizeof(info));
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nb = (il * sizeof(struct entryInfo_s)) + dl;
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uc = sizeof(il) + sizeof(dl) + nb;
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ei = xmalloc(uc);
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ei[0] = block[2];
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ei[1] = block[3];
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pe = (entryInfo) &ei[2];
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dataStart = (unsigned char *) (pe + il);
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if ((xx = Fread(pe, 1, nb, fd)) != nb) {
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rasprintf(&buf,
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_("sigh blob(%d): BAD, read returned %d\n"), (int)nb, xx);
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goto exit;
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}
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/* Check (and convert) the 1st tag element. */
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xx = headerVerifyInfo(1, dl, pe, &entry.info, 0);
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if (xx != -1) {
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rasprintf(&buf, _("tag[%d]: BAD, tag %d type %d offset %d count %d\n"),
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0, entry.info.tag, entry.info.type,
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entry.info.offset, entry.info.count);
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goto exit;
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}
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/* Is there an immutable header region tag? */
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if (entry.info.tag == RPMTAG_HEADERSIGNATURES
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&& entry.info.type == RPM_BIN_TYPE
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&& entry.info.count == REGION_TAG_COUNT)
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{
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/* Is the trailer within the data area? */
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if (entry.info.offset + REGION_TAG_COUNT > dl) {
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rasprintf(&buf,
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_("region offset: BAD, tag %d type %d offset %d count %d\n"),
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entry.info.tag, entry.info.type,
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entry.info.offset, entry.info.count);
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goto exit;
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}
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/* Is there an immutable header region tag trailer? */
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dataEnd = dataStart + entry.info.offset;
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(void) memcpy(&info, dataEnd, REGION_TAG_COUNT);
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/* XXX Really old packages have HEADER_IMAGE, not HEADER_SIGNATURES. */
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if (info.tag == htonl(RPMTAG_HEADERIMAGE)) {
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rpmTagVal stag = htonl(RPMTAG_HEADERSIGNATURES);
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info.tag = stag;
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memcpy(dataEnd, &stag, sizeof(stag));
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}
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dataEnd += REGION_TAG_COUNT;
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xx = headerVerifyInfo(1, dl, &info, &entry.info, 1);
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if (xx != -1 ||
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!((entry.info.tag == RPMTAG_HEADERSIGNATURES || entry.info.tag == RPMTAG_HEADERIMAGE)
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&& entry.info.type == RPM_BIN_TYPE
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&& entry.info.count == REGION_TAG_COUNT))
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{
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rasprintf(&buf,
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_("region trailer: BAD, tag %d type %d offset %d count %d\n"),
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entry.info.tag, entry.info.type,
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entry.info.offset, entry.info.count);
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goto exit;
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}
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memset(&info, 0, sizeof(info));
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/* Is the no. of tags in the region less than the total no. of tags? */
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ril = entry.info.offset/sizeof(*pe);
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if ((entry.info.offset % sizeof(*pe)) || ril > il) {
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rasprintf(&buf, _("region size: BAD, ril(%d) > il(%d)\n"), ril, il);
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goto exit;
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}
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}
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/* Sanity check signature tags */
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memset(&info, 0, sizeof(info));
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for (i = 1; i < il; i++) {
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xx = headerVerifyInfo(1, dl, pe+i, &entry.info, 0);
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if (xx != -1) {
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rasprintf(&buf,
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_("sigh tag[%d]: BAD, tag %d type %d offset %d count %d\n"),
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i, entry.info.tag, entry.info.type,
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entry.info.offset, entry.info.count);
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goto exit;
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}
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}
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/* OK, blob looks sane, load the header. */
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sigh = headerImport(ei, uc, 0);
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if (sigh == NULL) {
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rasprintf(&buf, _("sigh load: BAD\n"));
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goto exit;
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}
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{ size_t sigSize = headerSizeof(sigh, HEADER_MAGIC_YES);
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size_t pad = (8 - (sigSize % 8)) % 8; /* 8-byte pad */
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ssize_t trc;
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struct rpmtd_s sizetag;
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rpm_loff_t archSize = 0;
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/* Position at beginning of header. */
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if (pad && (trc = Fread(block, 1, pad, fd)) != pad) {
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rasprintf(&buf,
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_("sigh pad(%zd): BAD, read %zd bytes\n"), pad, trc);
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goto exit;
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}
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/* Print package component sizes. */
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if (headerGet(sigh, RPMSIGTAG_LONGSIZE, &sizetag, HEADERGET_DEFAULT)) {
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rpm_loff_t *tsize = rpmtdGetUint64(&sizetag);
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archSize = (tsize) ? *tsize : 0;
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} else if (headerGet(sigh, RPMSIGTAG_SIZE, &sizetag, HEADERGET_DEFAULT)) {
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rpm_off_t *tsize = rpmtdGetUint32(&sizetag);
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archSize = (tsize) ? *tsize : 0;
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}
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rpmtdFreeData(&sizetag);
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rc = printSize(fd, sigSize, pad, archSize);
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if (rc != RPMRC_OK) {
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rasprintf(&buf,
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_("sigh sigSize(%zd): BAD, fstat(2) failed\n"), sigSize);
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goto exit;
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}
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}
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ei = NULL; /* XXX will be freed with header */
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exit:
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if (sighp && sigh && rc == RPMRC_OK)
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*sighp = headerLink(sigh);
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headerFree(sigh);
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free(ei);
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if (msg != NULL) {
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*msg = buf;
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} else {
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free(buf);
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}
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return rc;
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}
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int rpmWriteSignature(FD_t fd, Header sigh)
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{
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static uint8_t buf[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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int sigSize, pad;
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int rc;
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rc = headerWrite(fd, sigh, HEADER_MAGIC_YES);
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if (rc)
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return rc;
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sigSize = headerSizeof(sigh, HEADER_MAGIC_YES);
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pad = (8 - (sigSize % 8)) % 8;
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if (pad) {
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if (Fwrite(buf, sizeof(buf[0]), pad, fd) != pad)
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rc = 1;
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}
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rpmlog(RPMLOG_DEBUG, "Signature: size(%d)+pad(%d)\n", sigSize, pad);
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return rc;
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}
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Header rpmNewSignature(void)
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{
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Header sigh = headerNew();
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return sigh;
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}
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Header rpmFreeSignature(Header sigh)
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{
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return headerFree(sigh);
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}
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static int makeHDRDigest(Header sigh, const char * file, rpmTagVal sigTag)
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{
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Header h = NULL;
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FD_t fd = NULL;
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char * SHA1 = NULL;
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int ret = -1; /* assume failure. */
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switch (sigTag) {
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case RPMSIGTAG_SHA1:
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fd = Fopen(file, "r.fdio");
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if (fd == NULL || Ferror(fd))
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goto exit;
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h = headerRead(fd, HEADER_MAGIC_YES);
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if (h == NULL)
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goto exit;
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if (headerIsEntry(h, RPMTAG_HEADERIMMUTABLE)) {
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DIGEST_CTX ctx;
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struct rpmtd_s utd;
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if (!headerGet(h, RPMTAG_HEADERIMMUTABLE, &utd, HEADERGET_DEFAULT)
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|| utd.data == NULL)
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{
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rpmlog(RPMLOG_ERR,
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_("Immutable header region could not be read. "
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"Corrupted package?\n"));
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goto exit;
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}
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ctx = rpmDigestInit(PGPHASHALGO_SHA1, RPMDIGEST_NONE);
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(void) rpmDigestUpdate(ctx, rpm_header_magic, sizeof(rpm_header_magic));
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(void) rpmDigestUpdate(ctx, utd.data, utd.count);
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(void) rpmDigestFinal(ctx, (void **)&SHA1, NULL, 1);
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rpmtdFreeData(&utd);
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} else {
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rpmlog(RPMLOG_ERR, _("Cannot sign RPM v3 packages\n"));
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goto exit;
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}
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if (SHA1 == NULL)
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goto exit;
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if (!sighdrPut(sigh, RPMSIGTAG_SHA1, RPM_STRING_TYPE, SHA1, 1))
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goto exit;
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ret = 0;
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break;
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default:
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break;
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}
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exit:
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free(SHA1);
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headerFree(h);
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if (fd != NULL) (void) Fclose(fd);
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return ret;
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}
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int rpmGenDigest(Header sigh, const char * file, rpmTagVal sigTag)
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{
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struct stat st;
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uint8_t * pkt = NULL;
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size_t pktlen;
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int ret = -1; /* assume failure. */
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switch (sigTag) {
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case RPMSIGTAG_SIZE: {
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rpm_off_t size;
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if (stat(file, &st) != 0)
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break;
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size = st.st_size;
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if (!sighdrPut(sigh, sigTag, RPM_INT32_TYPE, &size, 1))
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break;
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ret = 0;
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} break;
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case RPMSIGTAG_LONGSIZE: {
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rpm_loff_t size;
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if (stat(file, &st) != 0)
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break;
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size = st.st_size;
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if (!sighdrPut(sigh, sigTag, RPM_INT64_TYPE, &size, 1))
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break;
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ret = 0;
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} break;
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case RPMSIGTAG_MD5:
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pktlen = 16;
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pkt = xcalloc(pktlen, sizeof(*pkt));
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if (rpmDoDigest(PGPHASHALGO_MD5, file, 0, pkt, NULL)
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|| !sighdrPut(sigh, sigTag, RPM_BIN_TYPE, pkt, pktlen))
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break;
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ret = 0;
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break;
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case RPMSIGTAG_SHA1:
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ret = makeHDRDigest(sigh, file, sigTag);
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break;
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default:
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break;
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}
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free(pkt);
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return ret;
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}
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static const char * rpmSigString(rpmRC res)
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{
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const char * str;
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switch (res) {
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case RPMRC_OK: str = "OK"; break;
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case RPMRC_FAIL: str = "BAD"; break;
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case RPMRC_NOKEY: str = "NOKEY"; break;
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case RPMRC_NOTTRUSTED: str = "NOTRUSTED"; break;
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default:
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case RPMRC_NOTFOUND: str = "UNKNOWN"; break;
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}
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return str;
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}
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static rpmRC
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verifyMD5Digest(rpmtd sigtd, DIGEST_CTX md5ctx, char **msg)
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{
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rpmRC res = RPMRC_FAIL; /* assume failure */
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uint8_t * md5sum = NULL;
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size_t md5len = 0;
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char *md5;
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const char *title = _("MD5 digest:");
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*msg = NULL;
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DIGEST_CTX ctx = rpmDigestDup(md5ctx);
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if (ctx == NULL) {
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rasprintf(msg, "%s %s\n", title, rpmSigString(res));
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goto exit;
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}
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(void) rpmDigestFinal(ctx, (void **)&md5sum, &md5len, 0);
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md5 = pgpHexStr(md5sum, md5len);
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if (md5len != sigtd->count || memcmp(md5sum, sigtd->data, md5len)) {
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char *hex = rpmtdFormat(sigtd, RPMTD_FORMAT_STRING, NULL);
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rasprintf(msg, "%s %s Expected(%s) != (%s)\n", title,
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rpmSigString(res), hex, md5);
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free(hex);
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} else {
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res = RPMRC_OK;
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rasprintf(msg, "%s %s (%s)\n", title, rpmSigString(res), md5);
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}
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free(md5);
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exit:
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md5sum = _free(md5sum);
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return res;
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}
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/**
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* Verify header immutable region SHA1 digest.
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* @retval msg verbose success/failure text
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* @param sha1ctx
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* @return RPMRC_OK on success
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*/
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static rpmRC
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verifySHA1Digest(rpmtd sigtd, DIGEST_CTX sha1ctx, char **msg)
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{
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rpmRC res = RPMRC_FAIL; /* assume failure */
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char * SHA1 = NULL;
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const char *title = _("Header SHA1 digest:");
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const char *sig = sigtd->data;
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*msg = NULL;
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DIGEST_CTX ctx = rpmDigestDup(sha1ctx);
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if (ctx == NULL) {
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rasprintf(msg, "%s %s\n", title, rpmSigString(res));
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goto exit;
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}
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(void) rpmDigestFinal(ctx, (void **)&SHA1, NULL, 1);
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if (SHA1 == NULL || !rstreq(SHA1, sig)) {
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rasprintf(msg, "%s %s Expected(%s) != (%s)\n", title,
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rpmSigString(res), sig, SHA1 ? SHA1 : "(nil)");
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} else {
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res = RPMRC_OK;
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rasprintf(msg, "%s %s (%s)\n", title, rpmSigString(res), SHA1);
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}
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exit:
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SHA1 = _free(SHA1);
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return res;
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}
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/**
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* Verify DSA/RSA signature.
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* @param keyring pubkey keyring
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* @param sig OpenPGP signature parameters
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* @param hashctx digest context
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* @param isHdr header-only signature?
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* @retval msg verbose success/failure text
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* @return RPMRC_OK on success
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*/
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static rpmRC
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verifySignature(rpmKeyring keyring, pgpDigParams sig, DIGEST_CTX hashctx,
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int isHdr, char **msg)
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{
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rpmRC res = rpmKeyringVerifySig(keyring, sig, hashctx);
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char *sigid = pgpIdentItem(sig);
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rasprintf(msg, "%s%s: %s\n", isHdr ? _("Header ") : "", sigid,
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rpmSigString(res));
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free(sigid);
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return res;
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}
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rpmRC
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rpmVerifySignature(rpmKeyring keyring, rpmtd sigtd, pgpDigParams sig,
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DIGEST_CTX ctx, char ** result)
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{
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rpmRC res = RPMRC_NOTFOUND;
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char *msg = NULL;
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int hdrsig = 0;
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if (sigtd->data == NULL || sigtd->count <= 0 || ctx == NULL)
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goto exit;
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switch (sigtd->tag) {
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case RPMSIGTAG_MD5:
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res = verifyMD5Digest(sigtd, ctx, &msg);
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break;
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case RPMSIGTAG_SHA1:
|
|
res = verifySHA1Digest(sigtd, ctx, &msg);
|
|
break;
|
|
case RPMSIGTAG_RSA:
|
|
case RPMSIGTAG_DSA:
|
|
hdrsig = 1;
|
|
/* fallthrough */
|
|
case RPMSIGTAG_PGP5: /* XXX legacy */
|
|
case RPMSIGTAG_PGP:
|
|
case RPMSIGTAG_GPG:
|
|
if (sig != NULL)
|
|
res = verifySignature(keyring, sig, ctx, hdrsig, &msg);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
exit:
|
|
if (res == RPMRC_NOTFOUND) {
|
|
rasprintf(&msg,
|
|
_("Verify signature: BAD PARAMETERS (%d %p %d %p %p)\n"),
|
|
sigtd->tag, sigtd->data, sigtd->count, ctx, sig);
|
|
res = RPMRC_FAIL;
|
|
}
|
|
|
|
if (result) {
|
|
*result = msg;
|
|
} else {
|
|
free(msg);
|
|
}
|
|
return res;
|
|
}
|