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15e17067ee
frr/0006-cve-2022-26126.patch
Michal Ruprich 38e840d2af Fix for CVE-2022-16126
2022-04-11 12:00:54 +02:00

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From ac3133450de12ba86c051265fc0f1b12bc57b40c Mon Sep 17 00:00:00 2001
From: whichbug <whichbug@github.com>
Date: Thu, 10 Feb 2022 22:49:41 -0500
Subject: [PATCH] isisd: fix #10505 using base64 encoding
Using base64 instead of the raw string to encode
the binary data.
Signed-off-by: whichbug <whichbug@github.com>
---
isisd/isis_nb_notifications.c | 16 +--
lib/base64.c | 193 ++++++++++++++++++++++++++++++++++
lib/base64.h | 45 ++++++++
lib/subdir.am | 2 +
lib/yang_wrappers.c | 59 +++++++++++
lib/yang_wrappers.h | 7 ++
6 files changed, 314 insertions(+), 8 deletions(-)
create mode 100644 lib/base64.c
create mode 100644 lib/base64.h
diff --git a/isisd/isis_nb_notifications.c b/isisd/isis_nb_notifications.c
index f219632acf7..fd7b1b3159a 100644
--- a/isisd/isis_nb_notifications.c
+++ b/isisd/isis_nb_notifications.c
@@ -245,7 +245,7 @@ void isis_notif_max_area_addr_mismatch(const struct isis_circuit *circuit,
data = yang_data_new_uint8(xpath_arg, max_area_addrs);
listnode_add(arguments, data);
snprintf(xpath_arg, sizeof(xpath_arg), "%s/raw-pdu", xpath);
- data = yang_data_new(xpath_arg, raw_pdu);
+ data = yang_data_new_binary(xpath_arg, raw_pdu, raw_pdu_len);
listnode_add(arguments, data);
hook_call(isis_hook_max_area_addr_mismatch, circuit, max_area_addrs,
@@ -270,7 +270,7 @@ void isis_notif_authentication_type_failure(const struct isis_circuit *circuit,
notif_prep_instance_hdr(xpath, area, "default", arguments);
notif_prepr_iface_hdr(xpath, circuit, arguments);
snprintf(xpath_arg, sizeof(xpath_arg), "%s/raw-pdu", xpath);
- data = yang_data_new(xpath_arg, raw_pdu);
+ data = yang_data_new_binary(xpath_arg, raw_pdu, raw_pdu_len);
listnode_add(arguments, data);
hook_call(isis_hook_authentication_type_failure, circuit, raw_pdu,
@@ -294,7 +294,7 @@ void isis_notif_authentication_failure(const struct isis_circuit *circuit,
notif_prep_instance_hdr(xpath, area, "default", arguments);
notif_prepr_iface_hdr(xpath, circuit, arguments);
snprintf(xpath_arg, sizeof(xpath_arg), "%s/raw-pdu", xpath);
- data = yang_data_new(xpath_arg, raw_pdu);
+ data = yang_data_new_binary(xpath_arg, raw_pdu, raw_pdu_len);
listnode_add(arguments, data);
hook_call(isis_hook_authentication_failure, circuit, raw_pdu,
@@ -361,7 +361,7 @@ void isis_notif_reject_adjacency(const struct isis_circuit *circuit,
data = yang_data_new_string(xpath_arg, reason);
listnode_add(arguments, data);
snprintf(xpath_arg, sizeof(xpath_arg), "%s/raw-pdu", xpath);
- data = yang_data_new(xpath_arg, raw_pdu);
+ data = yang_data_new_binary(xpath_arg, raw_pdu, raw_pdu_len);
listnode_add(arguments, data);
hook_call(isis_hook_reject_adjacency, circuit, raw_pdu, raw_pdu_len);
@@ -384,7 +384,7 @@ void isis_notif_area_mismatch(const struct isis_circuit *circuit,
notif_prep_instance_hdr(xpath, area, "default", arguments);
notif_prepr_iface_hdr(xpath, circuit, arguments);
snprintf(xpath_arg, sizeof(xpath_arg), "%s/raw-pdu", xpath);
- data = yang_data_new(xpath_arg, raw_pdu);
+ data = yang_data_new_binary(xpath_arg, raw_pdu, raw_pdu_len);
listnode_add(arguments, data);
hook_call(isis_hook_area_mismatch, circuit, raw_pdu, raw_pdu_len);
@@ -467,7 +467,7 @@ void isis_notif_id_len_mismatch(const struct isis_circuit *circuit,
data = yang_data_new_uint8(xpath_arg, rcv_id_len);
listnode_add(arguments, data);
snprintf(xpath_arg, sizeof(xpath_arg), "%s/raw-pdu", xpath);
- data = yang_data_new(xpath_arg, raw_pdu);
+ data = yang_data_new_binary(xpath_arg, raw_pdu, raw_pdu_len);
listnode_add(arguments, data);
hook_call(isis_hook_id_len_mismatch, circuit, rcv_id_len, raw_pdu,
@@ -495,7 +495,7 @@ void isis_notif_version_skew(const struct isis_circuit *circuit,
data = yang_data_new_uint8(xpath_arg, version);
listnode_add(arguments, data);
snprintf(xpath_arg, sizeof(xpath_arg), "%s/raw-pdu", xpath);
- data = yang_data_new(xpath_arg, raw_pdu);
+ data = yang_data_new_binary(xpath_arg, raw_pdu, raw_pdu_len);
listnode_add(arguments, data);
hook_call(isis_hook_version_skew, circuit, version, raw_pdu,
@@ -525,7 +525,7 @@ void isis_notif_lsp_error(const struct isis_circuit *circuit,
data = yang_data_new_string(xpath_arg, rawlspid_print(lsp_id));
listnode_add(arguments, data);
snprintf(xpath_arg, sizeof(xpath_arg), "%s/raw-pdu", xpath);
- data = yang_data_new(xpath_arg, raw_pdu);
+ data = yang_data_new_binary(xpath_arg, raw_pdu, raw_pdu_len);
listnode_add(arguments, data);
/* ignore offset and tlv_type which cannot be set properly */
diff --git a/lib/base64.c b/lib/base64.c
new file mode 100644
index 00000000000..e3f238969b3
--- /dev/null
+++ b/lib/base64.c
@@ -0,0 +1,193 @@
+/*
+ * This is part of the libb64 project, and has been placed in the public domain.
+ * For details, see http://sourceforge.net/projects/libb64
+ */
+
+#include "base64.h"
+
+static const int CHARS_PER_LINE = 72;
+static const char *ENCODING =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+void base64_init_encodestate(struct base64_encodestate *state_in)
+{
+ state_in->step = step_A;
+ state_in->result = 0;
+ state_in->stepcount = 0;
+}
+
+char base64_encode_value(char value_in)
+{
+ if (value_in > 63)
+ return '=';
+ return ENCODING[(int)value_in];
+}
+
+int base64_encode_block(const char *plaintext_in, int length_in, char *code_out,
+ struct base64_encodestate *state_in)
+{
+ const char *plainchar = plaintext_in;
+ const char *const plaintextend = plaintext_in + length_in;
+ char *codechar = code_out;
+ char result;
+ char fragment;
+
+ result = state_in->result;
+
+ switch (state_in->step) {
+ while (1) {
+ case step_A:
+ if (plainchar == plaintextend) {
+ state_in->result = result;
+ state_in->step = step_A;
+ return codechar - code_out;
+ }
+ fragment = *plainchar++;
+ result = (fragment & 0x0fc) >> 2;
+ *codechar++ = base64_encode_value(result);
+ result = (fragment & 0x003) << 4;
+ /* fall through */
+ case step_B:
+ if (plainchar == plaintextend) {
+ state_in->result = result;
+ state_in->step = step_B;
+ return codechar - code_out;
+ }
+ fragment = *plainchar++;
+ result |= (fragment & 0x0f0) >> 4;
+ *codechar++ = base64_encode_value(result);
+ result = (fragment & 0x00f) << 2;
+ /* fall through */
+ case step_C:
+ if (plainchar == plaintextend) {
+ state_in->result = result;
+ state_in->step = step_C;
+ return codechar - code_out;
+ }
+ fragment = *plainchar++;
+ result |= (fragment & 0x0c0) >> 6;
+ *codechar++ = base64_encode_value(result);
+ result = (fragment & 0x03f) >> 0;
+ *codechar++ = base64_encode_value(result);
+
+ ++(state_in->stepcount);
+ if (state_in->stepcount == CHARS_PER_LINE/4) {
+ *codechar++ = '\n';
+ state_in->stepcount = 0;
+ }
+ }
+ }
+ /* control should not reach here */
+ return codechar - code_out;
+}
+
+int base64_encode_blockend(char *code_out, struct base64_encodestate *state_in)
+{
+ char *codechar = code_out;
+
+ switch (state_in->step) {
+ case step_B:
+ *codechar++ = base64_encode_value(state_in->result);
+ *codechar++ = '=';
+ *codechar++ = '=';
+ break;
+ case step_C:
+ *codechar++ = base64_encode_value(state_in->result);
+ *codechar++ = '=';
+ break;
+ case step_A:
+ break;
+ }
+ *codechar++ = '\n';
+
+ return codechar - code_out;
+}
+
+
+signed char base64_decode_value(signed char value_in)
+{
+ static const signed char decoding[] = {
+ 62, -1, -1, -1, 63, 52, 53, 54,
+ 55, 56, 57, 58, 59, 60, 61, -1,
+ -1, -1, -2, -1, -1, -1, 0, 1,
+ 2, 3, 4, 5, 6, 7, 8, 9,
+ 10, 11, 12, 13, 14, 15, 16, 17,
+ 18, 19, 20, 21, 22, 23, 24, 25,
+ -1, -1, -1, -1, -1, -1, 26, 27,
+ 28, 29, 30, 31, 32, 33, 34, 35,
+ 36, 37, 38, 39, 40, 41, 42, 43,
+ 44, 45, 46, 47, 48, 49, 50, 51
+ };
+ value_in -= 43;
+ if (value_in < 0 || value_in >= 80)
+ return -1;
+ return decoding[(int)value_in];
+}
+
+void base64_init_decodestate(struct base64_decodestate *state_in)
+{
+ state_in->step = step_a;
+ state_in->plainchar = 0;
+}
+
+int base64_decode_block(const char *code_in, int length_in, char *plaintext_out,
+ struct base64_decodestate *state_in)
+{
+ const char *codec = code_in;
+ char *plainc = plaintext_out;
+ signed char fragmt;
+
+ *plainc = state_in->plainchar;
+
+ switch (state_in->step) {
+ while (1) {
+ case step_a:
+ do {
+ if (codec == code_in+length_in) {
+ state_in->step = step_a;
+ state_in->plainchar = *plainc;
+ return plainc - plaintext_out;
+ }
+ fragmt = base64_decode_value(*codec++);
+ } while (fragmt < 0);
+ *plainc = (fragmt & 0x03f) << 2;
+ /* fall through */
+ case step_b:
+ do {
+ if (codec == code_in+length_in) {
+ state_in->step = step_b;
+ state_in->plainchar = *plainc;
+ return plainc - plaintext_out;
+ }
+ fragmt = base64_decode_value(*codec++);
+ } while (fragmt < 0);
+ *plainc++ |= (fragmt & 0x030) >> 4;
+ *plainc = (fragmt & 0x00f) << 4;
+ /* fall through */
+ case step_c:
+ do {
+ if (codec == code_in+length_in) {
+ state_in->step = step_c;
+ state_in->plainchar = *plainc;
+ return plainc - plaintext_out;
+ }
+ fragmt = base64_decode_value(*codec++);
+ } while (fragmt < 0);
+ *plainc++ |= (fragmt & 0x03c) >> 2;
+ *plainc = (fragmt & 0x003) << 6;
+ /* fall through */
+ case step_d:
+ do {
+ if (codec == code_in+length_in) {
+ state_in->step = step_d;
+ state_in->plainchar = *plainc;
+ return plainc - plaintext_out;
+ }
+ fragmt = base64_decode_value(*codec++);
+ } while (fragmt < 0);
+ *plainc++ |= (fragmt & 0x03f);
+ }
+ }
+ /* control should not reach here */
+ return plainc - plaintext_out;
+}
diff --git a/lib/base64.h b/lib/base64.h
new file mode 100644
index 00000000000..3dc1559aa48
--- /dev/null
+++ b/lib/base64.h
@@ -0,0 +1,45 @@
+/*
+ * This is part of the libb64 project, and has been placed in the public domain.
+ * For details, see http://sourceforge.net/projects/libb64
+ */
+
+#ifndef _BASE64_H_
+#define _BASE64_H_
+
+enum base64_encodestep {
+ step_A, step_B, step_C
+};
+
+struct base64_encodestate {
+ enum base64_encodestep step;
+ char result;
+ int stepcount;
+};
+
+void base64_init_encodestate(struct base64_encodestate *state_in);
+
+char base64_encode_value(char value_in);
+
+int base64_encode_block(const char *plaintext_in, int length_in, char *code_out,
+ struct base64_encodestate *state_in);
+
+int base64_encode_blockend(char *code_out, struct base64_encodestate *state_in);
+
+
+enum base64_decodestep {
+ step_a, step_b, step_c, step_d
+};
+
+struct base64_decodestate {
+ enum base64_decodestep step;
+ char plainchar;
+};
+
+void base64_init_decodestate(struct base64_decodestate *state_in);
+
+signed char base64_decode_value(signed char value_in);
+
+int base64_decode_block(const char *code_in, int length_in, char *plaintext_out,
+ struct base64_decodestate *state_in);
+
+#endif /* _BASE64_H_ */
diff --git a/lib/subdir.am b/lib/subdir.am
index 648ab7f14a1..f8f82f2766f 100644
--- a/lib/subdir.am
+++ b/lib/subdir.am
@@ -8,6 +8,7 @@ lib_libfrr_la_LIBADD = $(LIBCAP) $(UNWIND_LIBS) $(LIBYANG_LIBS) $(LUA_LIB) $(UST
lib_libfrr_la_SOURCES = \
lib/agg_table.c \
lib/atomlist.c \
+ lib/base64.c \
lib/bfd.c \
lib/buffer.c \
lib/checksum.c \
@@ -177,6 +178,7 @@ clippy_scan += \
pkginclude_HEADERS += \
lib/agg_table.h \
lib/atomlist.h \
+ lib/base64.h \
lib/bfd.h \
lib/bitfield.h \
lib/buffer.h \
diff --git a/lib/yang_wrappers.c b/lib/yang_wrappers.c
index 85aa003db72..bee76c6e0f5 100644
--- a/lib/yang_wrappers.c
+++ b/lib/yang_wrappers.c
@@ -19,6 +19,7 @@
#include <zebra.h>
+#include "base64.h"
#include "log.h"
#include "lib_errors.h"
#include "northbound.h"
@@ -676,6 +677,64 @@ void yang_get_default_string_buf(char *buf, size_t size, const char *xpath_fmt,
xpath);
}
+/*
+ * Primitive type: binary.
+ */
+struct yang_data *yang_data_new_binary(const char *xpath, const char *value,
+ size_t len)
+{
+ char *value_str;
+ struct base64_encodestate s;
+ int cnt;
+ char *c;
+ struct yang_data *data;
+
+ value_str = (char *)malloc(len * 2);
+ base64_init_encodestate(&s);
+ cnt = base64_encode_block(value, len, value_str, &s);
+ c = value_str + cnt;
+ cnt = base64_encode_blockend(c, &s);
+ c += cnt;
+ *c = 0;
+ data = yang_data_new(xpath, value_str);
+ free(value_str);
+ return data;
+}
+
+size_t yang_dnode_get_binary_buf(char *buf, size_t size,
+ const struct lyd_node *dnode,
+ const char *xpath_fmt, ...)
+{
+ const char *canon;
+ size_t cannon_len;
+ size_t decode_len;
+ size_t ret_len;
+ size_t cnt;
+ char *value_str;
+ struct base64_decodestate s;
+
+ canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+ cannon_len = strlen(canon);
+ decode_len = cannon_len;
+ value_str = (char *)malloc(decode_len);
+ base64_init_decodestate(&s);
+ cnt = base64_decode_block(canon, cannon_len, value_str, &s);
+
+ ret_len = size > cnt ? cnt : size;
+ memcpy(buf, value_str, ret_len);
+ if (size < cnt) {
+ char xpath[XPATH_MAXLEN];
+
+ yang_dnode_get_path(dnode, xpath, sizeof(xpath));
+ flog_warn(EC_LIB_YANG_DATA_TRUNCATED,
+ "%s: value was truncated [xpath %s]", __func__,
+ xpath);
+ }
+ free(value_str);
+ return ret_len;
+}
+
+
/*
* Primitive type: empty.
*/
diff --git a/lib/yang_wrappers.h b/lib/yang_wrappers.h
index d781dfb1e42..56b314876f2 100644
--- a/lib/yang_wrappers.h
+++ b/lib/yang_wrappers.h
@@ -118,6 +118,13 @@ extern const char *yang_get_default_string(const char *xpath_fmt, ...);
extern void yang_get_default_string_buf(char *buf, size_t size,
const char *xpath_fmt, ...);
+/* binary */
+extern struct yang_data *yang_data_new_binary(const char *xpath,
+ const char *value, size_t len);
+extern size_t yang_dnode_get_binary_buf(char *buf, size_t size,
+ const struct lyd_node *dnode,
+ const char *xpath_fmt, ...);
+
/* empty */
extern struct yang_data *yang_data_new_empty(const char *xpath);
extern bool yang_dnode_get_empty(const struct lyd_node *dnode,
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