From 7da1e826ccb08fdd404524146736b3f12a473e31 Mon Sep 17 00:00:00 2001

From: chantra <chantr4@gmail.com>

Date: Mon, 31 Jan 2022 14:42:25 -0800

Subject: [PATCH 10/30] [rpm2extents] Make rpmkeys support reading metadata

 from transcoded footer

If the file is seekable and is a transcoded file, read signature validation from transcoded file tail metadata

---

 lib/rpmchecksig.c    | 112 ++++++++++++++++++++++++++++++++++++++++++-

 tests/rpm2extents.at |  34 ++++++++++++-

 2 files changed, 144 insertions(+), 2 deletions(-)

diff --git a/lib/rpmchecksig.c b/lib/rpmchecksig.c

index fcdbb424f..6164d012c 100644

--- a/lib/rpmchecksig.c

+++ b/lib/rpmchecksig.c

@@ -24,6 +24,11 @@

 #include "debug.h"

+/* magic value at end of file (64 bits) that indicates this is a transcoded

+ * rpm.

+ */

+#define MAGIC 3472329499408095051

+

 int _print_pkts = 0;

 static int doImport(rpmts ts, const char *fn, char *buf, ssize_t blen)

@@ -220,6 +225,107 @@ exit:

     return rc;

 }

+static rpmRC isTranscodedRpm(FD_t fd) {

+    rpmRC rc = RPMRC_NOTFOUND;

+    rpm_loff_t current;

+    uint64_t magic;

+    size_t len;

+

+    // If the file is not seekable, we cannot detect whether or not it is transcoded.

+    if(Fseek(fd, 0, SEEK_CUR) < 0) {

+        return RPMRC_FAIL;

+    }

+    current = Ftell(fd);

+

+    if(Fseek(fd, -(sizeof(magic)), SEEK_END) < 0) {

+	rpmlog(RPMLOG_ERR, _("isTranscodedRpm: failed to seek for magic\n"));

+	rc = RPMRC_FAIL;

+	goto exit;

+    }

+    len = sizeof(magic);

+    if (Fread(&magic, len, 1, fd) != len) {

+	rpmlog(RPMLOG_ERR, _("isTranscodedRpm: unable to read magic\n"));

+	rc = RPMRC_FAIL;

+	goto exit;

+    }

+    if (magic != MAGIC) {

+	rpmlog(RPMLOG_DEBUG, _("isTranscodedRpm: not transcoded\n"));

+	rc = RPMRC_NOTFOUND;

+	goto exit;

+    }

+    rc = RPMRC_OK;

+exit:

+    if (Fseek(fd, current, SEEK_SET) < 0) {

+	rpmlog(RPMLOG_ERR, _("isTranscodedRpm: unable to seek back to original location\n"));

+    }

+    return rc;

+}

+

+static int rpmpkgVerifySigsTranscoded(FD_t fd){

+    rpm_loff_t current;

+    uint64_t magic;

+    rpm_loff_t offset;

+    int32_t rc;

+    size_t len;

+    uint64_t content_len;

+    char *content = NULL;

+

+    current = Ftell(fd);

+

+    if(Fseek(fd, -(sizeof(magic) + 3 * sizeof(offset) ), SEEK_END) < 0) {

+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: failed to seek for offset\n"));

+	rc = -1;

+	goto exit;

+    }

+

+    len = sizeof(offset);

+    if (Fread(&offset, len, 1, fd) != len) {

+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to read Signature Verification offset\n"));

+	rc = -1;

+	goto exit;

+    }

+

+    if(Fseek(fd,  offset, SEEK_SET) < 0) {

+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to seek signature verification offset\n"));

+	rc = -1;

+	goto exit;

+    }

+    len = sizeof(rc);

+    if (Fread(&rc, len, 1, fd) != len) {

+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to read Signature Verification RC\n"));

+	rc = -1;

+	goto exit;

+    }

+

+    len = sizeof(content_len);

+    if (Fread(&content_len, len, 1, fd) != len) {

+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to read signature content length\n"));

+	goto exit;

+    }

+

+    content = malloc(content_len + 1);

+    if(content == NULL) {

+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to allocate memory to read signature content\n"));

+	goto exit;

+    }

+    content[content_len] = 0;

+    if (Fread(content, content_len, 1, fd) != content_len) {

+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: Failed to read signature content\n"));

+	goto exit;

+    }

+

+    rpmlog(RPMLOG_NOTICE, "%s", content);

+exit:

+    if(content){

+	free(content);

+    }

+    if (Fseek(fd, current, SEEK_SET) < 0) {

+	rpmlog(RPMLOG_ERR, _("rpmpkgVerifySigsTranscoded: unable to seek back to original location\n"));

+    }

+    return rc;

+

+}

+

 static int rpmpkgVerifySigs(rpmKeyring keyring, int vfylevel, rpmVSFlags flags,

 			   FD_t fd, const char *fn)

 {

@@ -229,10 +335,14 @@ static int rpmpkgVerifySigs(rpmKeyring keyring, int vfylevel, rpmVSFlags flags,

 			    .verbose = rpmIsVerbose(),

     };

     int rc;

-    struct rpmvs_s *vs = rpmvsCreate(vfylevel, flags, keyring);

     rpmlog(RPMLOG_NOTICE, "%s:%s", fn, vd.verbose ? "\n" : "");

+    if(isTranscodedRpm(fd) == RPMRC_OK){

+	return rpmpkgVerifySigsTranscoded(fd);

+    }

+    struct rpmvs_s *vs = rpmvsCreate(vfylevel, flags, keyring);

+

     rc = rpmpkgRead(vs, fd, NULL, NULL, &msg;;

     if (rc)

diff --git a/tests/rpm2extents.at b/tests/rpm2extents.at

index baea987e4..18accfc75 100644

--- a/tests/rpm2extents.at

+++ b/tests/rpm2extents.at

@@ -29,7 +29,7 @@ AT_CHECK([runroot_other cat /data/RPMS/hello-2.0-1.x86_64.rpm | runroot_other rp

 [ignore])

 AT_CLEANUP

-# Check that tailer writes checksig return code and content.

+# Check that transcoder writes checksig return code and content.

 #

 AT_SETUP([rpm2extents signature])

 AT_KEYWORDS([rpm2extents digest signature])

@@ -62,3 +62,35 @@ RPMSignOutput Content     Header V4 RSA/SHA256 Signature, key ID 1964c5fc: OK

 ],

 [])

 AT_CLEANUP

+

+AT_SETUP([rpm2extents signature verification])

+AT_KEYWORDS([rpm2extents digest signature])

+AT_CHECK([

+RPMDB_INIT

+

+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

+runroot rpmkeys -Kv /tmp/hello-2.0-1.x86_64-signed.rpm; echo $?

+runroot rpmkeys --import /data/keys/rpm.org-rsa-2048-test.pub

+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

+runroot rpmkeys -Kv /tmp/hello-2.0-1.x86_64-signed.rpm; echo $?

+],

+[0],

+[/tmp/hello-2.0-1.x86_64-signed.rpm:

+    Header V4 RSA/SHA256 Signature, key ID 1964c5fc: NOKEY

+    Header SHA256 digest: OK

+    Header SHA1 digest: OK

+    Payload SHA256 digest: OK

+    V4 RSA/SHA256 Signature, key ID 1964c5fc: NOKEY

+    MD5 digest: OK

+1

+/tmp/hello-2.0-1.x86_64-signed.rpm:

+    Header V4 RSA/SHA256 Signature, key ID 1964c5fc: OK

+    Header SHA256 digest: OK

+    Header SHA1 digest: OK

+    Payload SHA256 digest: OK

+    V4 RSA/SHA256 Signature, key ID 1964c5fc: OK

+    MD5 digest: OK

+0

+],

+[])

+AT_CLEANUP

-- 

2.35.1