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Move common functions into common.c

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This commit is contained in:
M. Mert Yildiran 2022-06-08 01:47:04 +03:00
parent 21a560d56b
commit 694e4c555e
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GPG Key ID: D42ADB236521BF7A
7 changed files with 170 additions and 272 deletions
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145
tap/tlstapper/bpf/common.c Normal file
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@ -0,0 +1,145 @@
/*
Note: This file is licenced differently from the rest of the project
SPDX-License-Identifier: GPL-2.0
Copyright (C) UP9 Inc.
*/
#include "include/headers.h"
#include "include/util.h"
#include "include/maps.h"
#include "include/log.h"
#include "include/logger_messages.h"
static __always_inline int get_count_bytes(struct pt_regs *ctx, struct ssl_info* info, __u64 id) {
int returnValue = PT_REGS_RC(ctx);
if (info->count_ptr == NULL) {
// ssl_read and ssl_write return the number of bytes written/read
//
return returnValue;
}
// ssl_read_ex and ssl_write_ex return 1 for success
//
if (returnValue != 1) {
return 0;
}
// ssl_read_ex and ssl_write_ex write the number of bytes to an arg named *count
//
size_t countBytes;
long err = bpf_probe_read(&countBytes, sizeof(size_t), (void*) info->count_ptr);
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_BYTES_COUNT, id, err, 0l);
return 0;
}
return countBytes;
}
static __always_inline int add_address_to_chunk(struct pt_regs *ctx, struct tls_chunk* chunk, __u64 id, __u32 fd) {
__u32 pid = id >> 32;
__u64 key = (__u64) pid << 32 | fd;
struct fd_info *fdinfo = bpf_map_lookup_elem(&file_descriptor_to_ipv4, &key);
if (fdinfo == NULL) {
return 0;
}
int err = bpf_probe_read(chunk->address, sizeof(chunk->address), fdinfo->ipv4_addr);
chunk->flags |= (fdinfo->flags & FLAGS_IS_CLIENT_BIT);
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_FD_ADDRESS, id, err, 0l);
return 0;
}
return 1;
}
static __always_inline void send_chunk_part(struct pt_regs *ctx, __u8* buffer, __u64 id,
struct tls_chunk* chunk, int start, int end) {
size_t recorded = MIN(end - start, sizeof(chunk->data));
if (recorded <= 0) {
return;
}
chunk->recorded = recorded;
chunk->start = start;
// This ugly trick is for the ebpf verifier happiness
//
long err = 0;
if (chunk->recorded == sizeof(chunk->data)) {
err = bpf_probe_read(chunk->data, sizeof(chunk->data), buffer + start);
} else {
recorded &= (sizeof(chunk->data) - 1); // Buffer must be N^2
err = bpf_probe_read(chunk->data, recorded, buffer + start);
}
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_FROM_SSL_BUFFER, id, err, 0l);
return;
}
bpf_perf_event_output(ctx, &chunks_buffer, BPF_F_CURRENT_CPU, chunk, sizeof(struct tls_chunk));
}
static __always_inline void send_chunk(struct pt_regs *ctx, __u8* buffer, __u64 id, struct tls_chunk* chunk) {
// ebpf loops must be bounded at compile time, we can't use (i < chunk->len / CHUNK_SIZE)
//
// https://lwn.net/Articles/794934/
//
// However we want to run in kernel older than 5.3, hence we use "#pragma unroll" anyway
//
#pragma unroll
for (int i = 0; i < MAX_CHUNKS_PER_OPERATION; i++) {
if (chunk->len <= (CHUNK_SIZE * i)) {
break;
}
send_chunk_part(ctx, buffer, id, chunk, CHUNK_SIZE * i, chunk->len);
}
}
static __always_inline void output_ssl_chunk(struct pt_regs *ctx, struct ssl_info* info, int count_bytes, __u64 id, __u32 flags) {
if (count_bytes <= 0) {
return;
}
if (count_bytes > (CHUNK_SIZE * MAX_CHUNKS_PER_OPERATION)) {
log_error(ctx, LOG_ERROR_BUFFER_TOO_BIG, id, count_bytes, 0l);
return;
}
struct tls_chunk* chunk;
int zero = 0;
// If other thread, running on the same CPU get to this point at the same time like us (context switch)
// the data will be corrupted - protection may be added in the future
//
chunk = bpf_map_lookup_elem(&heap, &zero);
if (!chunk) {
log_error(ctx, LOG_ERROR_ALLOCATING_CHUNK, id, 0l, 0l);
return;
}
chunk->flags = flags;
chunk->pid = id >> 32;
chunk->tgid = id;
chunk->len = count_bytes;
chunk->fd = info->fd;
if (!add_address_to_chunk(ctx, chunk, id, chunk->fd)) {
// Without an address, we drop the chunk because there is not much to do with it in Go
//
return;
}
send_chunk(ctx, info->buffer, id, chunk);
}

138
tap/tlstapper/bpf/golang_uprobes.c
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@ -10,142 +10,17 @@ Copyright (C) UP9 Inc.
#include "include/log.h"
#include "include/logger_messages.h"
#include "include/pids.h"
#include "include/common.h"
static __always_inline int golang_get_count_bytes(struct pt_regs *ctx, struct ssl_info* info, __u64 id) {
size_t countBytes;
long err = bpf_probe_read(&countBytes, sizeof(size_t), (void*) info->count_ptr);
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_BYTES_COUNT, id, err, 0l);
return 0;
}
return countBytes;
}
static __always_inline int golang_add_address_to_chunk(struct pt_regs *ctx, struct tls_chunk* chunk, __u64 id, __u32 fd) {
__u32 pid = id >> 32;
__u64 key = (__u64) pid << 32 | fd;
// bpf_printk("[golang_add_address_to_chunk] file_descriptor_to_ipv4 key: %d", key);
struct fd_info *fdinfo = bpf_map_lookup_elem(&file_descriptor_to_ipv4, &key);
if (fdinfo == NULL) {
return 0;
}
int err = bpf_probe_read(chunk->address, sizeof(chunk->address), fdinfo->ipv4_addr);
chunk->flags |= (fdinfo->flags & FLAGS_IS_CLIENT_BIT);
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_FD_ADDRESS, id, err, 0l);
return 0;
}
return 1;
}
static __always_inline void golang_send_chunk_part(struct pt_regs *ctx, __u8* buffer, __u64 id,
struct tls_chunk* chunk, int start, int end) {
size_t recorded = MIN(end - start, sizeof(chunk->data));
if (recorded <= 0) {
return;
}
chunk->recorded = recorded;
chunk->start = start;
// This ugly trick is for the ebpf verifier happiness
//
long err = 0;
if (chunk->recorded == sizeof(chunk->data)) {
err = bpf_probe_read(chunk->data, sizeof(chunk->data), buffer + start);
} else {
recorded &= (sizeof(chunk->data) - 1); // Buffer must be N^2
err = bpf_probe_read(chunk->data, recorded, buffer + start);
}
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_FROM_SSL_BUFFER, id, err, 0l);
return;
}
// bpf_printk("[golang_send_chunk_part] perf_event");
bpf_perf_event_output(ctx, &chunks_buffer, BPF_F_CURRENT_CPU, chunk, sizeof(struct tls_chunk));
}
static __always_inline void golang_send_chunk(struct pt_regs *ctx, __u8* buffer, __u64 id, struct tls_chunk* chunk) {
// ebpf loops must be bounded at compile time, we can't use (i < chunk->len / CHUNK_SIZE)
//
// https://lwn.net/Articles/794934/
//
// However we want to run in kernel older than 5.3, hence we use "#pragma unroll" anyway
//
#pragma unroll
for (int i = 0; i < MAX_CHUNKS_PER_OPERATION; i++) {
if (chunk->len <= (CHUNK_SIZE * i)) {
break;
}
golang_send_chunk_part(ctx, buffer, id, chunk, CHUNK_SIZE * i, chunk->len);
}
}
static __always_inline void golang_output_ssl_chunk(struct pt_regs *ctx, struct ssl_info* info, __u64 id, __u32 flags) {
int countBytes = info->buffer_len;
// bpf_printk("countBytes: %d", countBytes);
if (countBytes <= 0) {
return;
}
if (countBytes > (CHUNK_SIZE * MAX_CHUNKS_PER_OPERATION)) {
log_error(ctx, LOG_ERROR_BUFFER_TOO_BIG, id, countBytes, 0l);
return;
}
struct tls_chunk* chunk;
int zero = 0;
// If other thread, running on the same CPU get to this point at the same time like us (context switch)
// the data will be corrupted - protection may be added in the future
//
chunk = bpf_map_lookup_elem(&heap, &zero);
if (!chunk) {
log_error(ctx, LOG_ERROR_ALLOCATING_CHUNK, id, 0l, 0l);
return;
}
chunk->flags = flags;
chunk->pid = id >> 32;
chunk->tgid = id;
chunk->len = countBytes;
chunk->fd = info->fd;
if (!golang_add_address_to_chunk(ctx, chunk, id, chunk->fd)) {
// bpf_printk("OOPS! Can't determine address.");
// Without an address, we drop the chunk because there is not much to do with it in Go
//
return;
}
golang_send_chunk(ctx, info->buffer, id, chunk);
}
SEC("uprobe/golang_crypto_tls_write")
static __always_inline int golang_crypto_tls_write_uprobe(struct pt_regs *ctx) {
// bpf_printk("called [golang_crypto_tls_write_uprobe]");
__u64 pid_tgid = bpf_get_current_pid_tgid();
__u64 pid = pid_tgid >> 32;
if (!should_tap(pid)) {
// bpf_printk("[golang_crypto_tls_write_uprobe] SHOULD NOT TAP");
return 0;
}
bpf_printk("[golang_crypto_tls_write_uprobe] ssl_write_context lookup key: %d", pid_tgid);
struct ssl_info *infoPtr = bpf_map_lookup_elem(&ssl_write_context, &pid_tgid);
struct ssl_info info = {};
@ -176,20 +51,16 @@ static __always_inline int golang_crypto_tls_write_uprobe(struct pt_regs *ctx) {
log_error(ctx, LOG_ERROR_PUTTING_SSL_CONTEXT, pid_tgid, err, 0l);
}
bpf_printk("[golang_crypto_tls_write_uprobe] reached output info.fd: %d", info.fd);
golang_output_ssl_chunk(ctx, &info, pid_tgid, 0);
output_ssl_chunk(ctx, &info, info.buffer_len, pid_tgid, 0);
return 0;
}
SEC("uprobe/golang_crypto_tls_read")
static __always_inline int golang_crypto_tls_read_uprobe(struct pt_regs *ctx) {
// bpf_printk("called [golang_crypto_tls_read_uprobe]");
__u64 pid_tgid = bpf_get_current_pid_tgid();
__u64 pid = pid_tgid >> 32;
if (!should_tap(pid)) {
// bpf_printk("[golang_crypto_tls_read_uprobe] SHOULD NOT TAP");
return 0;
}
@ -202,7 +73,6 @@ static __always_inline int golang_crypto_tls_read_uprobe(struct pt_regs *ctx) {
return 0;
}
bpf_printk("[golang_crypto_tls_read_uprobe] ssl_read_context lookup key: %d", pid_tgid);
struct ssl_info *infoPtr = bpf_map_lookup_elem(&ssl_read_context, &pid_tgid);
struct ssl_info info = {};
@ -233,9 +103,7 @@ static __always_inline int golang_crypto_tls_read_uprobe(struct pt_regs *ctx) {
log_error(ctx, LOG_ERROR_PUTTING_SSL_CONTEXT, pid_tgid, err, 0l);
}
bpf_printk("[golang_crypto_tls_read_uprobe] reached output info.fd: %d", info.fd);
golang_output_ssl_chunk(ctx, &info, pid_tgid, FLAGS_IS_READ_BIT);
output_ssl_chunk(ctx, &info, info.buffer_len, pid_tgid, FLAGS_IS_READ_BIT);
return 0;
}

16
tap/tlstapper/bpf/include/common.h Normal file
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@ -0,0 +1,16 @@
/*
Note: This file is licenced differently from the rest of the project
SPDX-License-Identifier: GPL-2.0
Copyright (C) UP9 Inc.
*/
#ifndef __COMMON__
#define __COMMON__
int get_count_bytes(struct pt_regs *ctx, struct ssl_info* info, __u64 id);
int add_address_to_chunk(struct pt_regs *ctx, struct tls_chunk* chunk, __u64 id, __u32 fd);
void send_chunk_part(struct pt_regs *ctx, __u8* buffer, __u64 id, struct tls_chunk* chunk, int start, int end);
void send_chunk(struct pt_regs *ctx, __u8* buffer, __u64 id, struct tls_chunk* chunk);
void output_ssl_chunk(struct pt_regs *ctx, struct ssl_info* info, int count_bytes, __u64 id, __u32 flags);
#endif /* __COMMON__ */

142
tap/tlstapper/bpf/openssl_uprobes.c
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@ -10,143 +10,9 @@ Copyright (C) UP9 Inc.
#include "include/log.h"
#include "include/logger_messages.h"
#include "include/pids.h"
#include "include/common.h"
static __always_inline int get_count_bytes(struct pt_regs *ctx, struct ssl_info* info, __u64 id) {
int returnValue = PT_REGS_RC(ctx);
if (info->count_ptr == NULL) {
// ssl_read and ssl_write return the number of bytes written/read
//
return returnValue;
}
// ssl_read_ex and ssl_write_ex return 1 for success
//
if (returnValue != 1) {
return 0;
}
// ssl_read_ex and ssl_write_ex write the number of bytes to an arg named *count
//
size_t countBytes;
long err = bpf_probe_read(&countBytes, sizeof(size_t), (void*) info->count_ptr);
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_BYTES_COUNT, id, err, 0l);
return 0;
}
return countBytes;
}
static __always_inline int add_address_to_chunk(struct pt_regs *ctx, struct tls_chunk* chunk, __u64 id, __u32 fd) {
__u32 pid = id >> 32;
__u64 key = (__u64) pid << 32 | fd;
struct fd_info *fdinfo = bpf_map_lookup_elem(&file_descriptor_to_ipv4, &key);
if (fdinfo == NULL) {
return 0;
}
int err = bpf_probe_read(chunk->address, sizeof(chunk->address), fdinfo->ipv4_addr);
chunk->flags |= (fdinfo->flags & FLAGS_IS_CLIENT_BIT);
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_FD_ADDRESS, id, err, 0l);
return 0;
}
return 1;
}
static __always_inline void send_chunk_part(struct pt_regs *ctx, __u8* buffer, __u64 id,
struct tls_chunk* chunk, int start, int end) {
size_t recorded = MIN(end - start, sizeof(chunk->data));
if (recorded <= 0) {
return;
}
chunk->recorded = recorded;
chunk->start = start;
// This ugly trick is for the ebpf verifier happiness
//
long err = 0;
if (chunk->recorded == sizeof(chunk->data)) {
err = bpf_probe_read(chunk->data, sizeof(chunk->data), buffer + start);
} else {
recorded &= (sizeof(chunk->data) - 1); // Buffer must be N^2
err = bpf_probe_read(chunk->data, recorded, buffer + start);
}
if (err != 0) {
log_error(ctx, LOG_ERROR_READING_FROM_SSL_BUFFER, id, err, 0l);
return;
}
bpf_perf_event_output(ctx, &chunks_buffer, BPF_F_CURRENT_CPU, chunk, sizeof(struct tls_chunk));
}
static __always_inline void send_chunk(struct pt_regs *ctx, __u8* buffer, __u64 id, struct tls_chunk* chunk) {
// ebpf loops must be bounded at compile time, we can't use (i < chunk->len / CHUNK_SIZE)
//
// https://lwn.net/Articles/794934/
//
// However we want to run in kernel older than 5.3, hence we use "#pragma unroll" anyway
//
#pragma unroll
for (int i = 0; i < MAX_CHUNKS_PER_OPERATION; i++) {
if (chunk->len <= (CHUNK_SIZE * i)) {
break;
}
send_chunk_part(ctx, buffer, id, chunk, CHUNK_SIZE * i, chunk->len);
}
}
static __always_inline void output_ssl_chunk(struct pt_regs *ctx, struct ssl_info* info, __u64 id, __u32 flags) {
int countBytes = get_count_bytes(ctx, info, id);
if (countBytes <= 0) {
return;
}
if (countBytes > (CHUNK_SIZE * MAX_CHUNKS_PER_OPERATION)) {
log_error(ctx, LOG_ERROR_BUFFER_TOO_BIG, id, countBytes, 0l);
return;
}
struct tls_chunk* chunk;
int zero = 0;
// If other thread, running on the same CPU get to this point at the same time like us (context switch)
// the data will be corrupted - protection may be added in the future
//
chunk = bpf_map_lookup_elem(&heap, &zero);
if (!chunk) {
log_error(ctx, LOG_ERROR_ALLOCATING_CHUNK, id, 0l, 0l);
return;
}
chunk->flags = flags;
chunk->pid = id >> 32;
chunk->tgid = id;
chunk->len = countBytes;
chunk->fd = info->fd;
if (!add_address_to_chunk(ctx, chunk, id, chunk->fd)) {
// Without an address, we drop the chunk because there is not much to do with it in Go
//
return;
}
send_chunk(ctx, info->buffer, id, chunk);
}
static __always_inline void ssl_uprobe(struct pt_regs *ctx, void* ssl, void* buffer, int num, struct bpf_map_def* map_fd, size_t *count_ptr) {
__u64 id = bpf_get_current_pid_tgid();
@ -223,8 +89,10 @@ static __always_inline void ssl_uretprobe(struct pt_regs *ctx, struct bpf_map_de
log_error(ctx, LOG_ERROR_MISSING_FILE_DESCRIPTOR, id, 0l, 0l);
return;
}
output_ssl_chunk(ctx, &info, id, flags);
int count_bytes = get_count_bytes(ctx, &info, id);
output_ssl_chunk(ctx, &info, count_bytes, id, flags);
}
SEC("uprobe/ssl_write")

1
tap/tlstapper/bpf/tls_tapper.c
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@ -13,6 +13,7 @@ Copyright (C) UP9 Inc.
// To avoid multiple .o files
//
#include "common.c"
#include "openssl_uprobes.c"
#include "golang_uprobes.c"
#include "fd_tracepoints.c"

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tap/tlstapper/tlstapper_bpfeb.o
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