richardphibel / rpms / rpm

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From 3669fecaba2858aeca44d1bfc265760611ea8834 Mon Sep 17 00:00:00 2001
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From: Jes Sorensen <jsorensen@fb.com>
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Date: Wed, 10 Jun 2020 12:30:54 -0400
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Subject: [PATCH 32/33] rpmsign: Add argument to specify algorithm for fsverity
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 signatures
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The argument --verity-algo can be used to specify the algorithm for
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the fsverity signatures. If nothing is specified, this will default to
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sha256. The available algorithms depend on libfsverity, currently
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sha256 and sha512 are supported.
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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 doc/rpmsign.8        |  3 +++
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 rpmsign.c            |  7 +++++++
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 sign/rpmgensig.c     | 22 ++++++++++++++++++++--
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 sign/rpmsignverity.c |  6 +++---
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 sign/rpmsignverity.h |  2 +-
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 5 files changed, 34 insertions(+), 6 deletions(-)
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diff --git a/doc/rpmsign.8 b/doc/rpmsign.8
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index a212746fe..5165e39f9 100644
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--- a/doc/rpmsign.8
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+++ b/doc/rpmsign.8
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@@ -55,6 +55,9 @@ Used with \fB--signfiles\fR, use file signing key \fIKey\fR.
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 \fB--certpath \fICERT\fB\fR
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 Used with \fB--signverity\fR, use file signing certificate \fICert\fR.
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 .TP
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+\fB--verityalgo \fIALG\fB\fR
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+Used with \fB--signverity\fR, to specify the signing algorithm. sha256 and sha512 are supported, with sha256 being the default if this argument is not specified. This can also be specified with the macro %_verity_algorithm
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+.TP
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 \fB--signfiles\fR
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 Sign package files. The macro \fB%_binary_filedigest_algorithm\fR must
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 be set to a supported algorithm before building the package. The
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diff --git a/rpmsign.c b/rpmsign.c
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index e43811e9f..12299379c 100644
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--- a/rpmsign.c
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+++ b/rpmsign.c
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@@ -25,6 +25,7 @@ static char * fileSigningKey = NULL;
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 #endif
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 #ifdef WITH_FSVERITY
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 static char * fileSigningCert = NULL;
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+static char * verityAlgorithm = NULL;
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 #endif
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 static struct rpmSignArgs sargs = {NULL, 0, 0};
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@@ -52,6 +53,9 @@ static struct poptOption signOptsTable[] = {
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     { "signverity", '\0', (POPT_ARG_VAL|POPT_ARGFLAG_OR),
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 	&sargs.signflags, RPMSIGN_FLAG_FSVERITY,
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 	N_("generate fsverity signatures for package(s) files"), NULL},
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+    { "verityalgo", '\0', POPT_ARG_STRING, &verityAlgorithm, 0,
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+	N_("algorithm to use for verity signatures, default sha256"),
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+	N_("<algorithm>") },
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     { "certpath", '\0', POPT_ARG_STRING, &fileSigningCert, 0,
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 	N_("use file signing cert <cert>"),
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 	N_("<cert>") },
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@@ -138,6 +142,9 @@ static int doSign(poptContext optCon, struct rpmSignArgs *sargs)
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     if (fileSigningCert) {
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 	rpmPushMacro(NULL, "_file_signing_cert", NULL, fileSigningCert, RMIL_GLOBAL);
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     }
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+    if (verityAlgorithm) {
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+	rpmPushMacro(NULL, "_verity_algorithm", NULL, verityAlgorithm, RMIL_GLOBAL);
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+    }
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 #endif
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     if (flags_sign_files(sargs->signflags)) {
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diff --git a/sign/rpmgensig.c b/sign/rpmgensig.c
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index 02cf0bc62..b3b02828a 100644
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--- a/sign/rpmgensig.c
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+++ b/sign/rpmgensig.c
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@@ -8,6 +8,10 @@
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 #include <sys/wait.h>
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 #include <popt.h>
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 #include <fcntl.h>
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+#include <fcntl.h>
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+#ifdef WITH_FSVERITY
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+#include <libfsverity.h>
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+#endif
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 #include <rpm/rpmlib.h>			/* RPMSIGTAG & related */
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 #include <rpm/rpmmacro.h>
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@@ -458,23 +462,37 @@ static rpmRC includeFileSignatures(Header *sigp, Header *hdrp)
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 static rpmRC includeVeritySignatures(FD_t fd, Header *sigp, Header *hdrp)
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 {
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 #ifdef WITH_FSVERITY
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-    rpmRC rc;
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+    rpmRC rc = RPMRC_OK;
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     char *key = rpmExpand("%{?_file_signing_key}", NULL);
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     char *keypass = rpmExpand("%{?_file_signing_key_password}", NULL);
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     char *cert = rpmExpand("%{?_file_signing_cert}", NULL);
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+    char *algorithm = rpmExpand("%{?_verity_algorithm}", NULL);
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+    uint16_t algo = 0;
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     if (rstreq(keypass, "")) {
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 	free(keypass);
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 	keypass = NULL;
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     }
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+    if (algorithm && strlen(algorithm) > 0) {
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+	    algo = libfsverity_find_hash_alg_by_name(algorithm);
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+	    rpmlog(RPMLOG_DEBUG, _("Searching for algorithm %s got %i\n"),
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+		   algorithm, algo);
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+	    if (!algo) {
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+		    rpmlog(RPMLOG_ERR, _("Unsupported fsverity algorithm %s\n"),
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+			   algorithm);
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+		    rc = RPMRC_FAIL;
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+		    goto out;
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+	    }
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+    }
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     if (key && cert) {
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-	rc = rpmSignVerity(fd, *sigp, *hdrp, key, keypass, cert);
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+	    rc = rpmSignVerity(fd, *sigp, *hdrp, key, keypass, cert, algo);
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     } else {
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 	rpmlog(RPMLOG_ERR, _("fsverity signatures requires a key and a cert\n"));
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 	rc = RPMRC_FAIL;
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     }
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+ out:
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     free(keypass);
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     free(key);
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     free(cert);
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diff --git a/sign/rpmsignverity.c b/sign/rpmsignverity.c
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index 55096e732..e6c830cdc 100644
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--- a/sign/rpmsignverity.c
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+++ b/sign/rpmsignverity.c
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@@ -95,7 +95,7 @@ static char *rpmVeritySignFile(rpmfi fi, size_t *sig_size, char *key,
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 }
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 rpmRC rpmSignVerity(FD_t fd, Header sigh, Header h, char *key,
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-		    char *keypass, char *cert)
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+		    char *keypass, char *cert, uint16_t algo)
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 {
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     int rc;
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     FD_t gzdi;
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@@ -111,7 +111,6 @@ rpmRC rpmSignVerity(FD_t fd, Header sigh, Header h, char *key,
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     char **signatures = NULL;
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     size_t sig_size;
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     int nr_files, idx;
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-    uint16_t algo;
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     uint32_t algo32;
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     Fseek(fd, 0, SEEK_SET);
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@@ -156,7 +155,8 @@ rpmRC rpmSignVerity(FD_t fd, Header sigh, Header h, char *key,
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     nr_files = rpmfiFC(hfi);
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     signatures = xcalloc(nr_files, sizeof(char *));
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-    algo = FS_VERITY_HASH_ALG_SHA256;
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+    if (!algo)
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+	    algo = FS_VERITY_HASH_ALG_SHA256;
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     rpmlog(RPMLOG_DEBUG, _("file count - header: %i, payload %i\n"),
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 	   nr_files, rpmfiFC(fi));
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diff --git a/sign/rpmsignverity.h b/sign/rpmsignverity.h
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index 69bbaf7f7..d869e8d8e 100644
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--- a/sign/rpmsignverity.h
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+++ b/sign/rpmsignverity.h
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@@ -27,7 +27,7 @@ extern "C" {
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  */
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 RPM_GNUC_INTERNAL
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 rpmRC rpmSignVerity(FD_t fd, Header sigh, Header h, char *key,
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-		    char *keypass, char *cert);
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+		    char *keypass, char *cert, uint16_t algo);
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 #ifdef _cplusplus
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 }
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-- 
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2.27.0
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