diff mbox series

[v1,1/4] secvar: ensure ESL buf size is at least what ESL header expects

Message ID 20210720160501.9850-1-nick.child@ibm.com
State Accepted
Headers show
Series [v1,1/4] secvar: ensure ESL buf size is at least what ESL header expects | expand

Commit Message

Nick Child July 20, 2021, 4:04 p.m. UTC 
From: Nick Child <nnac123@gmail.com>

commit ID: 8a31163a0271f11b4597bca4e803f559e38e3d24 from upstream.

Currently, `get_esl_cert` receives a data buffer containing an ESL and its
length. It is to return a data buffer of the certificate that is contained
inside the ESL. The ESL has header info that contains the certificates
`size`  and the size of the header (`sig_data_offset`). We use this
information to copy `size` bytes starting `sig_data_offset` bytes after the
given ESL buffer. Currently we are checking that the length of the ESL
buffer is at least `sig_data_offset` bytes but we are not checking that it
also has enough bytes to also contain `size` bytes of the certificate. This
becomes problematic if some data at the end of the ESL gets lost. Since the
ESL claims it has more than it actually does, this will lead to a buffer
over-read. What is even worse, is that this buffer over-read can go
unnoticed since the last 256 bytes of the ESL are usually the x509 2048 bit
signature so the extra garbage bytes that are copied will appear to be a
valid rsa signature.

To resolve this, this commit ensures that the ESL buffer length is large
enough to hold the data that it claims it contains.

Lastly, a new test case is added to test the described condition. It
includes a new test file `trimmedKEK.h` which contains a struct a valid KEK
auth file minus 5 bytes, therefore making it invalid.

Fixes: 87562bc5c1a6 ("secvar/backend: add edk2 derived key updates processing")
Signed-off-by: Nick Child <nick.child@ibm.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Nayna Jain <nayna@linux.ibm.com>
Tested-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
---

All patches have been cherry-picked off the upstream master branch.
The reason for backports being to fix current secvar processing behavior 
to bettrer match the intended behavior. See commit messages for a more 
elaborate explanation on backport importance. All commits also come with
a test case to show the specific bug they are fixing.

---

 libstb/secvar/backend/edk2-compat-process.c  |   6 +-
 libstb/secvar/test/data/trimmedKEK.h         | 161 +++++++++++++++++++
 libstb/secvar/test/secvar-test-edk2-compat.c |  16 ++
 3 files changed, 182 insertions(+), 1 deletion(-)
 create mode 100644 libstb/secvar/test/data/trimmedKEK.h
diff mbox series

Patch

diff --git a/libstb/secvar/backend/edk2-compat-process.c b/libstb/secvar/backend/edk2-compat-process.c
index 037c1b49..55b50d68 100644
--- a/libstb/secvar/backend/edk2-compat-process.c
+++ b/libstb/secvar/backend/edk2-compat-process.c
@@ -135,8 +135,12 @@  static int get_esl_cert(const char *buf, const size_t buflen, char **cert)
 	sig_data_offset = sizeof(EFI_SIGNATURE_LIST)
 			  + le32_to_cpu(list->SignatureHeaderSize)
 			  + 16 * sizeof(uint8_t);
-	if (sig_data_offset > buflen)
+
+	/* Ensure this ESL does not overflow the bounds of the buffer */
+	if (sig_data_offset + size > buflen) {
+		prlog(PR_ERR, "Number of bytes of ESL data is less than size specified\n");
 		return OPAL_PARAMETER;
+	}
 
 	*cert = zalloc(size);
 	if (!(*cert))
diff --git a/libstb/secvar/test/data/trimmedKEK.h b/libstb/secvar/test/data/trimmedKEK.h
new file mode 100644
index 00000000..6600d254
--- /dev/null
+++ b/libstb/secvar/test/data/trimmedKEK.h
@@ -0,0 +1,161 @@ 
+unsigned char trimmedKEK_auth[]  = {
+0xe4 ,0x07 ,0x09 ,0x0e ,0x0e ,0x22 ,0x2e ,0x00  ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
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+,0x8a ,0xa9 ,0x34 ,0x7d ,0x37 ,0x56 ,0x65 ,0xa7  ,0x30 ,0x82 ,0x05 ,0xb7 ,0x06 ,0x09 ,0x2a ,0x86
+,0x48 ,0x86 ,0xf7 ,0x0d ,0x01 ,0x07 ,0x02 ,0xa0  ,0x82 ,0x05 ,0xa8 ,0x30 ,0x82 ,0x05 ,0xa4 ,0x02
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+,0x52 ,0x42 ,0x60 ,0x97 ,0xb3 ,0x53 ,0xaa ,0xa4  ,0x4f ,0x98 ,0x7e ,0xa5 ,0x2a ,0xe1 ,0x52 ,0xfa
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+,0xee ,0x32 ,0xea ,0xd6 ,0x25 ,0xcf ,0x91 ,0x66  ,0x77 ,0x4c ,0xa1 ,0x0c ,0x6a ,0x7b ,0x6e ,0xb2
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+,0xa4 ,0xfc ,0xaa ,0x40 ,0x02 ,0x7c ,0x57 ,0xd9  ,0x73 ,0xc6 ,0xc0 ,0x59 ,0xcb ,0x47 ,0x71 ,0x07
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+,0xe0 ,0xb0 ,0x11 ,0x86 ,0x33 ,0x95 ,0xdf ,0x6e  ,0x9c ,0x3f ,0x0f ,0xc1 ,0x46 ,0x8c ,0x53 ,0x12
+,0xf1 ,0xd9 ,0xa8 ,0xee ,0x04 ,0xc5 ,0x71 ,0x52  ,0x22 ,0x13 ,0x0f ,0x91 ,0x0c ,0x73 ,0xca ,0x34
+,0xb1 ,0x36 ,0x5f ,0x8c ,0x2e ,0x0f ,0x3a ,0x04  ,0x42 ,0xfe ,0x45 ,0x82 ,0x29 ,0x56 ,0x5e ,0xe5
+,0x4c ,0xeb ,0x4b ,0xa6 ,0xe5 ,0xe0 ,0x1d ,0x74  ,0xc0 ,0x5a ,0x2f ,0x42 ,0xa5 ,0xf2 ,0x65 ,0xd5
+,0x4d ,0x3b ,0x22 ,0xd2 ,0x96 ,0x42 ,0xcf ,0xbd  ,0xd7 ,0x8b ,0x37 ,0x7a ,0xb6 ,0xd9 ,0xd4 ,0xd7
+,0x45 ,0x47 ,0x3b ,0x3c ,0xb3 ,0xd9 ,0x29 ,0x69  ,0x91 ,0x7d ,0x4c ,0x06 ,0xad ,0x6c ,0xea ,0x62
+,0xf1 ,0xf7 ,0xec ,0x67 ,0xae ,0xd5 ,0x43 ,0xd0  ,0xab ,0xb8 ,0xbf ,0xa4 ,0x28 ,0xd4 ,0x75 ,0xd2
+,0x3f ,0x53 ,0x5d ,0xa8 ,0x09 ,0x46 ,0x89 ,0x7f  ,0x84 ,0x36 ,0xad ,0x78 ,0x41 ,0x03 ,0xf4 ,0xc4
+,0x43 ,0x43 ,0xdc ,0x52 ,0xc6 ,0xff ,0xab ,0xd6  ,0x8c ,0x7f ,0xc0 ,0xab ,0x67 ,0x5b ,0x0b ,0xa9
+,0x6a ,0xd2 ,0x85 ,0x71 ,0x9f ,0xc2};
+
+unsigned int trimmedKEK_auth_len = 2518;
diff --git a/libstb/secvar/test/secvar-test-edk2-compat.c b/libstb/secvar/test/secvar-test-edk2-compat.c
index 8259ffa1..a769863b 100644
--- a/libstb/secvar/test/secvar-test-edk2-compat.c
+++ b/libstb/secvar/test/secvar-test-edk2-compat.c
@@ -12,6 +12,7 @@ 
 #include "./data/KEK.h"
 #include "./data/invalidkek.h"
 #include "./data/malformedkek.h"
+#include "./data/trimmedKEK.h"
 #include "./data/db.h"
 #include "./data/dbsigneddata.h"
 #include "./data/OldTSKEK.h"
@@ -196,6 +197,21 @@  int run_test()
 	tmp = find_secvar("db", 3, &variable_bank);
 	ASSERT(NULL != tmp);
 
+	/* Add trimmed KEK, .process(), should fail. */
+	printf("Add trimmed KEK\n");
+	tmp = new_secvar("KEK", 4, trimmedKEK_auth, trimmedKEK_auth_len, 0);
+	ASSERT(0 == edk2_compat_validate(tmp));
+	list_add_tail(&update_bank, &tmp->link);
+	ASSERT(1 == list_length(&update_bank));
+
+	rc = edk2_compat_process(&variable_bank, &update_bank);
+	ASSERT(OPAL_PARAMETER == rc);
+	ASSERT(5 == list_length(&variable_bank));
+	ASSERT(0 == list_length(&update_bank));
+	tmp = find_secvar("KEK", 4, &variable_bank);
+	ASSERT(NULL != tmp);
+	ASSERT(0 == tmp->data_size);
+
 	/* Add valid KEK, .process(), succeeds. */
 	printf("Add KEK");
 	tmp = new_secvar("KEK", 4, KEK_auth, KEK_auth_len, 0);