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From 7da1e826ccb08fdd404524146736b3f12a473e31 Mon Sep 17 00:00:00 2001
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From: chantra <chantr4@gmail.com>
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Date: Mon, 31 Jan 2022 14:42:25 -0800
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Subject: [PATCH 10/30] [rpm2extents] Make rpmkeys support reading metadata
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 from transcoded footer
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If the file is seekable and is a transcoded file, read signature validation from transcoded file tail metadata
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---
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 lib/rpmchecksig.c    | 112 ++++++++++++++++++++++++++++++++++++++++++-
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 tests/rpm2extents.at |  34 ++++++++++++-
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 2 files changed, 144 insertions(+), 2 deletions(-)
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diff --git a/lib/rpmchecksig.c b/lib/rpmchecksig.c
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index fcdbb424f..6164d012c 100644
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--- a/lib/rpmchecksig.c
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+++ b/lib/rpmchecksig.c
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@@ -24,6 +24,11 @@
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 #include "debug.h"
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+/* magic value at end of file (64 bits) that indicates this is a transcoded
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+ * rpm.
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+ */
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+#define MAGIC 3472329499408095051
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+
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 static int doImport(rpmts ts, const char *fn, char *buf, ssize_t blen)
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 {
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     char const * const pgpmark = "-----BEGIN PGP ";
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@@ -220,6 +225,107 @@ exit:
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     return rc;
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 }
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+static rpmRC isTranscodedRpm(FD_t fd) {
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+    rpmRC rc = RPMRC_NOTFOUND;
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+    rpm_loff_t current;
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+    uint64_t magic;
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+    size_t len;
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+
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+    // If the file is not seekable, we cannot detect whether or not it is transcoded.
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+    if(Fseek(fd, 0, SEEK_CUR) < 0) {
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+        return RPMRC_FAIL;
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+    }
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+    current = Ftell(fd);
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+
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+    if(Fseek(fd, -(sizeof(magic)), SEEK_END) < 0) {
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+	rpmlog(RPMLOG_ERR, _("isTranscodedRpm: failed to seek for magic\n"));
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+	rc = RPMRC_FAIL;
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+	goto exit;
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+    }
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+    len = sizeof(magic);
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+    if (Fread(&magic, len, 1, fd) != len) {
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+	rpmlog(RPMLOG_ERR, _("isTranscodedRpm: unable to read magic\n"));
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+	rc = RPMRC_FAIL;
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+	goto exit;
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+    }
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+    if (magic != MAGIC) {
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+	rpmlog(RPMLOG_DEBUG, _("isTranscodedRpm: not transcoded\n"));
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+	rc = RPMRC_NOTFOUND;
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+	goto exit;
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+    }
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+    rc = RPMRC_OK;
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+exit:
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+    if (Fseek(fd, current, SEEK_SET) < 0) {
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+	rpmlog(RPMLOG_ERR, _("isTranscodedRpm: unable to seek back to original location\n"));
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+    }
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+    return rc;
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+}
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+
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+static int rpmpkgVerifySigsTranscoded(FD_t fd){
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+    rpm_loff_t current;
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+    uint64_t magic;
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+    rpm_loff_t offset;
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+    int32_t rc;
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+    size_t len;
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+    uint64_t content_len;
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+    char *content = NULL;
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+
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+    current = Ftell(fd);
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+
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+    if(Fseek(fd, -(sizeof(magic) + 3 * sizeof(offset) ), SEEK_END) < 0) {
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+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: failed to seek for offset\n"));
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+	rc = -1;
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+	goto exit;
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+    }
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+
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+    len = sizeof(offset);
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+    if (Fread(&offset, len, 1, fd) != len) {
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+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to read Signature Verification offset\n"));
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+	rc = -1;
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+	goto exit;
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+    }
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+
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+    if(Fseek(fd,  offset, SEEK_SET) < 0) {
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+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to seek signature verification offset\n"));
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+	rc = -1;
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+	goto exit;
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+    }
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+    len = sizeof(rc);
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+    if (Fread(&rc, len, 1, fd) != len) {
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+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to read Signature Verification RC\n"));
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+	rc = -1;
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+	goto exit;
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+    }
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+
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+    len = sizeof(content_len);
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+    if (Fread(&content_len, len, 1, fd) != len) {
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+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to read signature content length\n"));
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+	goto exit;
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+    }
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+
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+    content = malloc(content_len + 1);
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+    if(content == NULL) {
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+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to allocate memory to read signature content\n"));
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+	goto exit;
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+    }
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+    content[content_len] = 0;
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+    if (Fread(content, content_len, 1, fd) != content_len) {
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+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to read signature content\n"));
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+	goto exit;
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+    }
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+
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+    rpmlog(RPMLOG_NOTICE, "%s", content);
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+exit:
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+    if(content){
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+	free(content);
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+    }
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+    if (Fseek(fd, current, SEEK_SET) < 0) {
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+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: unable to seek back to original location\n"));
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+    }
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+    return rc;
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+
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+}
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+
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 static int rpmpkgVerifySigs(rpmKeyring keyring, int vfylevel, rpmVSFlags flags,
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 			   FD_t fd, const char *fn)
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 {
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@@ -229,10 +335,14 @@ static int rpmpkgVerifySigs(rpmKeyring keyring, int vfylevel, rpmVSFlags flags,
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 			    .verbose = rpmIsVerbose(),
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     };
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     int rc;
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-    struct rpmvs_s *vs = rpmvsCreate(vfylevel, flags, keyring);
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     rpmlog(RPMLOG_NOTICE, "%s:%s", fn, vd.verbose ? "\n" : "");
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+    if(isTranscodedRpm(fd) == RPMRC_OK){
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+	return rpmpkgVerifySigsTranscoded(fd);
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+    }
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+    struct rpmvs_s *vs = rpmvsCreate(vfylevel, flags, keyring);
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+
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     rc = rpmpkgRead(vs, fd, NULL, NULL, &msg;;
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     if (rc)
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diff --git a/tests/rpm2extents.at b/tests/rpm2extents.at
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index baea987e4..18accfc75 100644
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--- a/tests/rpm2extents.at
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+++ b/tests/rpm2extents.at
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@@ -29,7 +29,7 @@ AT_CHECK([runroot_other cat /data/RPMS/hello-2.0-1.x86_64.rpm | runroot_other rp
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 [ignore])
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 AT_CLEANUP
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-# Check that tailer writes checksig return code and content.
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+# Check that transcoder writes checksig return code and content.
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 #
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 AT_SETUP([rpm2extents signature])
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 AT_KEYWORDS([rpm2extents digest signature])
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@@ -62,3 +62,35 @@ RPMSignOutput Content     Header V4 RSA/SHA256 Signature, key ID 1964c5fc: OK
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 ],
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 [])
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 AT_CLEANUP
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+
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+AT_SETUP([rpm2extents signature verification])
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+AT_KEYWORDS([rpm2extents digest signature])
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+AT_CHECK([
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+RPMDB_INIT
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+
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+runroot_other cat /data/RPMS/hello-2.0-1.x86_64-signed.rpm | runroot_other rpm2extents SHA256 > ${RPMTEST}/tmp/hello-2.0-1.x86_64-signed.rpm 2> /dev/null
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+runroot rpmkeys -Kv /tmp/hello-2.0-1.x86_64-signed.rpm; echo $?
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+runroot rpmkeys --import /data/keys/rpm.org-rsa-2048-test.pub
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+runroot_other cat /data/RPMS/hello-2.0-1.x86_64-signed.rpm | runroot_other rpm2extents SHA256 > ${RPMTEST}/tmp/hello-2.0-1.x86_64-signed.rpm
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+runroot rpmkeys -Kv /tmp/hello-2.0-1.x86_64-signed.rpm; echo $?
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+],
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+[0],
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+[/tmp/hello-2.0-1.x86_64-signed.rpm:
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+    Header V4 RSA/SHA256 Signature, key ID 1964c5fc: NOKEY
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+    Header SHA256 digest: OK
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+    Header SHA1 digest: OK
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+    Payload SHA256 digest: OK
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+    V4 RSA/SHA256 Signature, key ID 1964c5fc: NOKEY
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+    MD5 digest: OK
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+1
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+/tmp/hello-2.0-1.x86_64-signed.rpm:
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+    Header V4 RSA/SHA256 Signature, key ID 1964c5fc: OK
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+    Header SHA256 digest: OK
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+    Header SHA1 digest: OK
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+    Payload SHA256 digest: OK
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+    V4 RSA/SHA256 Signature, key ID 1964c5fc: OK
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+    MD5 digest: OK
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+0
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+],
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+[])
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+AT_CLEANUP
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-- 
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2.35.1
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