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| 1 | + |
| 2 | +typedef unsigned long size_t; |
| 3 | +#define STDIN_FILENO (0) |
| 4 | + |
| 5 | +size_t strlen(const char *s); |
| 6 | + |
| 7 | +void send(int fd, const void *buf, size_t bufLen, int d); |
| 8 | +void recv(int fd, void *buf, size_t bufLen, int d); |
| 9 | +void read(int fd, void *buf, size_t bufLen); |
| 10 | + |
| 11 | +void LogonUserA(int a, int b, const char *password, int d, int e, int f); |
| 12 | + |
| 13 | +int val(); |
| 14 | + |
| 15 | +void test_send(const char *password1, const char *password2, const char *password_hash, const char *message) |
| 16 | +{ |
| 17 | + { |
| 18 | + LogonUserA(val(), val(), password1, val(), val(), val()); // proof `password1` is plaintext |
| 19 | + |
| 20 | + send(val(), password1, strlen(password1), val()); // BAD: `password1` is sent plaintext (certainly) |
| 21 | + } |
| 22 | + |
| 23 | + { |
| 24 | + send(val(), password2, strlen(password2), val()); // BAD: `password2` is sent plaintext (probably) |
| 25 | + } |
| 26 | + |
| 27 | + { |
| 28 | + send(val(), password_hash, strlen(password_hash), val()); // GOOD: `password_hash` is sent encrypted |
| 29 | + } |
| 30 | + |
| 31 | + { |
| 32 | + send(val(), message, strlen(message), val()); // GOOD: `message` is not a password |
| 33 | + } |
| 34 | +} |
| 35 | + |
| 36 | +void test_receive() |
| 37 | +{ |
| 38 | + { |
| 39 | + char password[256]; |
| 40 | + |
| 41 | + recv(val(), password, 256, val()); // BAD: `password` is received plaintext (certainly) |
| 42 | + |
| 43 | + LogonUserA(val(), val(), password, val(), val(), val()); // (proof `password` is plaintext) |
| 44 | + } |
| 45 | + |
| 46 | + { |
| 47 | + char password[256]; |
| 48 | + |
| 49 | + recv(val(), password, 256, val()); // BAD: `password` is received plaintext (probably) |
| 50 | + } |
| 51 | + |
| 52 | + { |
| 53 | + char password_hash[256]; |
| 54 | + |
| 55 | + recv(val(), password_hash, 256, val()); // GOOD: `password` is received encrypted |
| 56 | + } |
| 57 | + |
| 58 | + { |
| 59 | + char message[256]; |
| 60 | + |
| 61 | + recv(val(), message, 256, val()); // GOOD: `message` is not a password |
| 62 | + } |
| 63 | +} |
| 64 | + |
| 65 | +void test_dataflow(const char *password1) |
| 66 | +{ |
| 67 | + { |
| 68 | + const char *ptr = password1; |
| 69 | + |
| 70 | + send(val(), ptr, strlen(ptr), val()); // BAD: `password` is sent plaintext |
| 71 | + } |
| 72 | + |
| 73 | + { |
| 74 | + char password[256]; |
| 75 | + char *ptr = password; |
| 76 | + |
| 77 | + recv(val(), ptr, 256, val()); // BAD: `password` is received plaintext |
| 78 | + } |
| 79 | + |
| 80 | + { |
| 81 | + char buffer[256]; |
| 82 | + |
| 83 | + recv(val(), buffer, 256, val()); // BAD: `password` is received plaintext [NOT DETECTED] |
| 84 | + |
| 85 | + char *password = buffer; |
| 86 | + } |
| 87 | +} |
| 88 | + |
| 89 | +void test_read() |
| 90 | +{ |
| 91 | + { |
| 92 | + char password[256]; |
| 93 | + int fd = val(); |
| 94 | + |
| 95 | + read(fd, password, 256); // BAD: `password` is received plaintext |
| 96 | + } |
| 97 | + |
| 98 | + { |
| 99 | + char password[256]; |
| 100 | + int fd = STDIN_FILENO; |
| 101 | + |
| 102 | + read(fd, password, 256); // GOOD: `password` is received from stdin, not a network socket |
| 103 | + } |
| 104 | +} |
| 105 | + |
| 106 | +void my_recv(char *buffer, size_t bufferSize) |
| 107 | +{ |
| 108 | + recv(val(), buffer, bufferSize, val()); |
| 109 | +} |
| 110 | + |
| 111 | +const char *id(const char *buffer) |
| 112 | +{ |
| 113 | + return buffer; |
| 114 | +} |
| 115 | + |
| 116 | +char *global_password; |
| 117 | + |
| 118 | +char *get_global_str() |
| 119 | +{ |
| 120 | + return global_password; |
| 121 | +} |
| 122 | + |
| 123 | +void test_interprocedural(const char *password1) |
| 124 | +{ |
| 125 | + { |
| 126 | + char password[256]; |
| 127 | + |
| 128 | + my_recv(password, 256); // BAD: `password` is received plaintext [detected on line 108] |
| 129 | + } |
| 130 | + |
| 131 | + { |
| 132 | + const char *ptr = id(password1); |
| 133 | + |
| 134 | + send(val(), ptr, strlen(ptr), val()); // BAD: `password1` is sent plaintext |
| 135 | + } |
| 136 | + |
| 137 | + { |
| 138 | + char *data = get_global_str(); |
| 139 | + |
| 140 | + send(val(), data, strlen(data), val()); // BAD: `global_password` is sent plaintext |
| 141 | + } |
| 142 | +} |
| 143 | + |
| 144 | +char *strncpy(char *s1, const char *s2, size_t n); |
| 145 | + |
| 146 | +void test_taint(const char *password) |
| 147 | +{ |
| 148 | + { |
| 149 | + char buffer[16]; |
| 150 | + |
| 151 | + strncpy(buffer, password, 16); |
| 152 | + buffer[15] = 0; |
| 153 | + send(val(), buffer, 16, val()); // BAD: `password` is (partially) sent plaintext |
| 154 | + } |
| 155 | +} |
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