Mercurial > dropbear

annotate fuzz/fuzz-wrapfd.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 1b160ed94749
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #define FUZZ_SKIP_WRAP 1
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2 #include "includes.h"
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3 #include "fuzz-wrapfd.h"
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4
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5 #include "dbutil.h"
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6
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7 #include "fuzz.h"
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8
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9 #define IOWRAP_MAXFD (FD_SETSIZE-1)
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10 static const int MAX_RANDOM_IN = 50000;
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11 static const double CHANCE_CLOSE = 1.0 / 600;
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12 static const double CHANCE_INTR = 1.0 / 900;
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13 static const double CHANCE_READ1 = 0.96;
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14 static const double CHANCE_READ2 = 0.5;
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15 static const double CHANCE_WRITE1 = 0.96;
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16 static const double CHANCE_WRITE2 = 0.5;
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17
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18 struct fdwrap {
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19 enum wrapfd_mode mode;
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20 int closein;
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21 int closeout;
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22 };
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23
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24 static struct fdwrap wrap_fds[IOWRAP_MAXFD+1] = {{UNUSED, 0, 0}};
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25 static int wrapfd_maxfd = -1;
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26 static unsigned short rand_state[3];
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27 static buffer *input_buf;
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28 static int devnull_fd = -1;
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29
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30 static void wrapfd_remove(int fd);
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31
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32 void wrapfd_setup(buffer *buf) {
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33 TRACE(("wrapfd_setup"))
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34
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35 // clean old ones
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36 int i;
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37 for (i = 0; i <= wrapfd_maxfd; i++) {
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38 if (wrap_fds[i].mode != UNUSED) {
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39 wrapfd_remove(i);
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40 }
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41 }
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42 wrapfd_maxfd = -1;
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43
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44 memset(rand_state, 0x0, sizeof(rand_state));
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45 wrapfd_setseed(50);
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46 input_buf = buf;
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47 }
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48
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49 void wrapfd_setseed(uint32_t seed) {
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50 memcpy(rand_state, &seed, sizeof(seed));
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51 nrand48(rand_state);
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52 }
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53
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54 int wrapfd_new_fuzzinput() {
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55 if (devnull_fd == -1) {
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56 devnull_fd = open("/dev/null", O_RDONLY);
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57 assert(devnull_fd != -1);
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58 }
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59
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60 int fd = dup(devnull_fd);
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61 assert(fd != -1);
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62 assert(wrap_fds[fd].mode == UNUSED);
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63 wrap_fds[fd].mode = COMMONBUF;
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64 wrap_fds[fd].closein = 0;
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65 wrap_fds[fd].closeout = 0;
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66 wrapfd_maxfd = MAX(fd, wrapfd_maxfd);
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67
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68 return fd;
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69 }
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70
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71 int wrapfd_new_dummy() {
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72 if (devnull_fd == -1) {
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73 devnull_fd = open("/dev/null", O_RDONLY);
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74 assert(devnull_fd != -1);
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75 }
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76
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77 int fd = dup(devnull_fd);
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78 if (fd == -1) {
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79 return -1;
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80 }
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81 if (fd > IOWRAP_MAXFD) {
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82 close(fd);
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83 errno = EMFILE;
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84 return -1;
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85 }
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86 assert(wrap_fds[fd].mode == UNUSED);
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87 wrap_fds[fd].mode = DUMMY;
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88 wrap_fds[fd].closein = 0;
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89 wrap_fds[fd].closeout = 0;
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90 wrapfd_maxfd = MAX(fd, wrapfd_maxfd);
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91
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92 return fd;
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93 }
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94
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95
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96 static void wrapfd_remove(int fd) {
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97 TRACE(("wrapfd_remove %d", fd))
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98 assert(fd >= 0);
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99 assert(fd <= IOWRAP_MAXFD);
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100 assert(wrap_fds[fd].mode != UNUSED);
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101 wrap_fds[fd].mode = UNUSED;
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102 close(fd);
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103 }
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104
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105 int wrapfd_close(int fd) {
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106 if (fd >= 0 && fd <= IOWRAP_MAXFD && wrap_fds[fd].mode != UNUSED) {
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107 wrapfd_remove(fd);
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108 return 0;
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109 } else {
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110 return close(fd);
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111 }
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112 }
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113
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114 int wrapfd_read(int fd, void *out, size_t count) {
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115 size_t maxread;
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116
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117 if (!fuzz.wrapfds) {
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118 return read(fd, out, count);
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119 }
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120
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121 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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122 /* XXX - assertion failure? */
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123 TRACE(("Bad read descriptor %d\n", fd))
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124 errno = EBADF;
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125 return -1;
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126 }
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127
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128 assert(count != 0);
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129
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130 if (wrap_fds[fd].closein || erand48(rand_state) < CHANCE_CLOSE) {
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131 wrap_fds[fd].closein = 1;
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132 errno = ECONNRESET;
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133 return -1;
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134 }
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135
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136 if (erand48(rand_state) < CHANCE_INTR) {
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137 errno = EINTR;
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138 return -1;
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139 }
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parents:
diff changeset
140
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Matt Johnston <matt@ucc.asn.au>
parents: 1756
diff changeset
141 if (input_buf && wrap_fds[fd].mode == COMMONBUF) {
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
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parents: 1596
diff changeset
142 maxread = MIN(input_buf->len - input_buf->pos, count);
1559
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diff changeset
143 /* returns 0 if buf is EOF, as intended */
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diff changeset
144 if (maxread > 0) {
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parents: 1356
diff changeset
145 maxread = nrand48(rand_state) % maxread + 1;
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diff changeset
146 }
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
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diff changeset
147 memcpy(out, buf_getptr(input_buf, maxread), maxread);
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
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diff changeset
148 buf_incrpos(input_buf, maxread);
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149 return maxread;
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parents:
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150 }
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parents:
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151
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diff changeset
152 // return fixed output, of random length
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153 maxread = MIN(MAX_RANDOM_IN, count);
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154 maxread = nrand48(rand_state) % maxread + 1;
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parents:
diff changeset
155 memset(out, 0xef, maxread);
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parents:
diff changeset
156 return maxread;
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parents:
diff changeset
157 }
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parents:
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158
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
159 int wrapfd_write(int fd, const void* in, size_t count) {
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
160 unsigned const volatile char* volin = in;
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parents:
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161 unsigned int i;
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162
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parents: 1356
diff changeset
163 if (!fuzz.wrapfds) {
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parents: 1356
diff changeset
164 return write(fd, in, count);
08f4fa4dc6a0 closer to working
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parents: 1356
diff changeset
165 }
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diff changeset
166
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diff changeset
167 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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diff changeset
168 /* XXX - assertion failure? */
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parents:
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169 TRACE(("Bad read descriptor %d\n", fd))
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parents:
diff changeset
170 errno = EBADF;
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parents:
diff changeset
171 return -1;
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parents:
diff changeset
172 }
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parents:
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173
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parents:
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174 assert(count != 0);
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175
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diff changeset
176 /* force read to exercise sanitisers */
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parents:
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177 for (i = 0; i < count; i++) {
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parents:
diff changeset
178 (void)volin[i];
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parents:
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179 }
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parents:
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180
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Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
181 if (wrap_fds[fd].closeout || erand48(rand_state) < CHANCE_CLOSE) {
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
182 wrap_fds[fd].closeout = 1;
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Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
183 errno = ECONNRESET;
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diff changeset
184 return -1;
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185 }
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parents:
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186
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parents:
diff changeset
187 if (erand48(rand_state) < CHANCE_INTR) {
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parents:
diff changeset
188 errno = EINTR;
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parents:
diff changeset
189 return -1;
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parents:
diff changeset
190 }
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parents:
diff changeset
191
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 return nrand48(rand_state) % (count+1);
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parents:
diff changeset
193 }
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parents:
diff changeset
194
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parents:
diff changeset
195 int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
1357
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parents: 1356
diff changeset
196 fd_set *exceptfds, struct timeval *timeout) {
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diff changeset
197 int i, nset, sel;
1356
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parents:
diff changeset
198 int ret = 0;
1528
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Matt Johnston <matt@ucc.asn.au>
parents: 1382
diff changeset
199 int fdlist[IOWRAP_MAXFD+1];
b9e4fd5a0e72 compile fixes
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parents: 1382
diff changeset
200
1357
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parents: 1356
diff changeset
201 if (!fuzz.wrapfds) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
202 return select(nfds, readfds, writefds, exceptfds, timeout);
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
203 }
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diff changeset
204
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diff changeset
205 assert(nfds <= IOWRAP_MAXFD+1);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206
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parents:
diff changeset
207 if (erand48(rand_state) < CHANCE_INTR) {
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parents:
diff changeset
208 errno = EINTR;
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parents:
diff changeset
209 return -1;
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parents:
diff changeset
210 }
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
211
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92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
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diff changeset
212 /* read */
1357
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diff changeset
213 if (readfds != NULL && erand48(rand_state) < CHANCE_READ1) {
1356
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parents:
diff changeset
214 for (i = 0, nset = 0; i < nfds; i++) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 if (FD_ISSET(i, readfds)) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 assert(wrap_fds[i].mode != UNUSED);
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parents:
diff changeset
217 fdlist[nset] = i;
1357
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parents: 1356
diff changeset
218 nset++;
1356
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parents:
diff changeset
219 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 }
1596
60fceff95858 workaround memory sanitizer FD_ZERO false positives
Matt Johnston <matt@ucc.asn.au>
parents: 1587
diff changeset
221 DROPBEAR_FD_ZERO(readfds);
1356
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 if (nset > 0) {
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
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parents: 1528
diff changeset
224 /* set one */
1357
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parents: 1356
diff changeset
225 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
226 FD_SET(sel, readfds);
1356
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parents:
diff changeset
227 ret++;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 if (erand48(rand_state) < CHANCE_READ2) {
1357
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Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
230 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
231 if (!FD_ISSET(sel, readfds)) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
232 FD_SET(sel, readfds);
1356
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 ret++;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1528
diff changeset
239 /* write */
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
240 if (writefds != NULL && erand48(rand_state) < CHANCE_WRITE1) {
1356
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 for (i = 0, nset = 0; i < nfds; i++) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 if (FD_ISSET(i, writefds)) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 assert(wrap_fds[i].mode != UNUSED);
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 fdlist[nset] = i;
1357
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parents: 1356
diff changeset
245 nset++;
1356
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parents:
diff changeset
246 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 }
1596
60fceff95858 workaround memory sanitizer FD_ZERO false positives
Matt Johnston <matt@ucc.asn.au>
parents: 1587
diff changeset
248 DROPBEAR_FD_ZERO(writefds);
1356
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parents:
diff changeset
249
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
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parents: 1528
diff changeset
250 /* set one */
1356
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 if (nset > 0) {
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
252 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
253 FD_SET(sel, writefds);
1356
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 ret++;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 if (erand48(rand_state) < CHANCE_WRITE2) {
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
257 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
258 if (!FD_ISSET(sel, writefds)) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
259 FD_SET(sel, writefds);
1356
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parents:
diff changeset
260 ret++;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 return ret;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 }
1357
08f4fa4dc6a0 closer to working
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parents: 1356
diff changeset
267
1791
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
268 int fuzz_kill(pid_t pid, int sig) {
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
269 if (fuzz.fuzzing) {
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
270 TRACE(("fuzz_kill ignoring pid %d signal %d", (pid), sig))
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
271 if (sig >= 0) {
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
272 return 0;
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
273 } else {
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
274 errno = EINVAL;
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
275 return -1;
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
276 }
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
277 }
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
278 return kill(pid, sig);
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
279 }