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annotate fuzz.h @ 1780:b5aedadc0008

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fuzzing - Set postauth user to root since that's what it runs as
author Matt Johnston <matt@ucc.asn.au>
date Tue, 17 Nov 2020 19:28:11 +0800
parents 36d4c027cba7
children a6da10ac64b5
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1 #ifndef DROPBEAR_FUZZ_H
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2 #define DROPBEAR_FUZZ_H
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3
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4 #include "config.h"
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5
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6 #if DROPBEAR_FUZZ
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7
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8 #include "includes.h"
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9 #include "buffer.h"
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10 #include "algo.h"
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11 #include "netio.h"
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12 #include "fuzz-wrapfd.h"
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14 // once per process
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15 void fuzz_common_setup(void);
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16 void fuzz_svr_setup(void);
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17 void fuzz_cli_setup(void);
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18
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19 // constructor attribute so it runs before main(), including
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20 // in non-fuzzing mode.
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21 void fuzz_early_setup(void) __attribute__((constructor));
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22
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23 // must be called once per fuzz iteration.
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24 // returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE
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25 int fuzz_set_input(const uint8_t *Data, size_t Size);
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26
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27 int fuzz_run_server(const uint8_t *Data, size_t Size, int skip_kexmaths, int authdone);
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28 int fuzz_run_client(const uint8_t *Data, size_t Size, int skip_kexmaths);
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29 const void* fuzz_get_algo(const algo_type *algos, const char* name);
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30
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31 // fuzzer functions that intrude into general code
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32 void fuzz_kex_fakealgos(void);
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33 int fuzz_checkpubkey_line(buffer* line, int line_num, char* filename,
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34 const char* algo, unsigned int algolen,
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35 const unsigned char* keyblob, unsigned int keybloblen);
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36 extern const char * const * fuzz_signkey_names;
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37 void fuzz_seed(const unsigned char* dat, unsigned int len);
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38
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39 typedef void(*connect_callback)(int result, int sock, void* data, const char* errstring);
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40 struct dropbear_progress_connection *fuzz_connect_remote(const char* remotehost, const char* remoteport,
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41 connect_callback cb, void* cb_data,
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42 const char* bind_address, const char* bind_port);
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43
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44 // helpers
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45 void fuzz_get_socket_address(int fd, char **local_host, char **local_port,
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46 char **remote_host, char **remote_port, int host_lookup);
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47 void fuzz_fake_send_kexdh_reply(void);
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48 int fuzz_spawn_command(int *ret_writefd, int *ret_readfd, int *ret_errfd, pid_t *ret_pid);
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49 void fuzz_dump(const unsigned char* data, size_t len);
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50
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51 // fake IO wrappers
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52 #ifndef FUZZ_SKIP_WRAP
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53 #define select(nfds, readfds, writefds, exceptfds, timeout) \
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54 wrapfd_select(nfds, readfds, writefds, exceptfds, timeout)
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55 #define write(fd, buf, count) wrapfd_write(fd, buf, count)
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56 #define read(fd, buf, count) wrapfd_read(fd, buf, count)
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57 #define close(fd) wrapfd_close(fd)
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58 #endif // FUZZ_SKIP_WRAP
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59
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60 struct dropbear_fuzz_options {
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61 int fuzzing;
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62
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63 // fuzzing input
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64 buffer *input;
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65 struct dropbear_cipher recv_cipher;
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66 struct dropbear_hash recv_mac;
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67 int wrapfds;
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68
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69 // whether to skip slow bignum maths
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70 int skip_kexmaths;
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71
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72 // dropbear_exit() jumps back
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73 int do_jmp;
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74 sigjmp_buf jmp;
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75
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76 // write out decrypted session data to this FD if it's set
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77 // flag - this needs to be set manually in cli-main.c etc
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78 int dumping;
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79 // the file descriptor
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80 int recv_dumpfd;
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81
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82 // avoid filling fuzzing logs, this points to /dev/null
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83 FILE *fake_stderr;
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84 };
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85
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86 extern struct dropbear_fuzz_options fuzz;
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87
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88 /* guard for when fuzz.h is included by fuzz-common.c */
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89 #ifndef FUZZ_NO_REPLACE_STDERR
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90
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91 /* This is a bodge but seems to work.
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92 glibc stdio.h has the comment
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93 "C89/C99 say they're macros. Make them happy." */
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94 /* OS X has it as a macro */
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95 #ifdef stderr
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96 #undef stderr
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97 #endif
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98 #define stderr (fuzz.fake_stderr)
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99
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100 #endif /* FUZZ_NO_REPLACE_STDERR */
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101
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102 struct passwd* fuzz_getpwuid(uid_t uid);
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103 struct passwd* fuzz_getpwnam(const char *login);
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104 /* guard for when fuzz.h is included by fuzz-common.c */
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105 #ifndef FUZZ_NO_REPLACE_GETPW
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106 #define getpwnam(x) fuzz_getpwnam(x)
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107 #define getpwuid(x) fuzz_getpwuid(x)
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108 #endif // FUZZ_NO_REPLACE_GETPW
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109
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110 #endif // DROPBEAR_FUZZ
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111
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112 #endif /* DROPBEAR_FUZZ_H */