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1 | /* |
2 | * Noise generation for PuTTY's cryptographic random number |
3 | * generator. |
4 | */ |
5 | |
6 | #include <windows.h> |
7 | #include <stdio.h> |
8 | |
9 | #include "putty.h" |
10 | #include "ssh.h" |
11 | |
12 | static char seedpath[2*MAX_PATH+10] = "\0"; |
13 | |
14 | /* |
15 | * Find the random seed file path and store it in `seedpath'. |
16 | */ |
17 | static void get_seedpath(void) { |
18 | HKEY rkey; |
19 | DWORD type, size; |
20 | |
21 | size = sizeof(seedpath); |
22 | |
23 | if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey)==ERROR_SUCCESS) { |
24 | int ret = RegQueryValueEx(rkey, "RandSeedFile", |
25 | 0, &type, seedpath, &size); |
26 | if (ret != ERROR_SUCCESS || type != REG_SZ) |
27 | seedpath[0] = '\0'; |
28 | RegCloseKey(rkey); |
29 | } else |
30 | seedpath[0] = '\0'; |
31 | |
32 | if (!seedpath[0]) { |
33 | int len, ret; |
34 | |
35 | len = GetEnvironmentVariable("HOMEDRIVE", seedpath, sizeof(seedpath)); |
36 | ret = GetEnvironmentVariable("HOMEPATH", seedpath+len, |
37 | sizeof(seedpath)-len); |
38 | if (ret == 0) { /* probably win95; store in \WINDOWS */ |
39 | GetWindowsDirectory(seedpath, sizeof(seedpath)); |
40 | len = strlen(seedpath); |
41 | } else |
42 | len += ret; |
43 | strcpy(seedpath+len, "\\PUTTY.RND"); |
44 | } |
45 | } |
46 | |
47 | /* |
48 | * This function is called once, at PuTTY startup, and will do some |
49 | * seriously silly things like listing directories and getting disk |
50 | * free space and a process snapshot. |
51 | */ |
52 | |
53 | void noise_get_heavy(void (*func) (void *, int)) { |
54 | HANDLE srch; |
55 | HANDLE seedf; |
56 | WIN32_FIND_DATA finddata; |
57 | char winpath[MAX_PATH+3]; |
58 | |
59 | GetWindowsDirectory(winpath, sizeof(winpath)); |
60 | strcat(winpath, "\\*"); |
61 | srch = FindFirstFile(winpath, &finddata); |
62 | if (srch != INVALID_HANDLE_VALUE) { |
63 | do { |
64 | func(&finddata, sizeof(finddata)); |
65 | } while (FindNextFile(srch, &finddata)); |
66 | FindClose(srch); |
67 | } |
68 | |
69 | if (!seedpath[0]) |
70 | get_seedpath(); |
71 | |
72 | seedf = CreateFile(seedpath, GENERIC_READ, |
73 | FILE_SHARE_READ | FILE_SHARE_WRITE, |
74 | NULL, OPEN_EXISTING, 0, NULL); |
75 | |
c1f5f956 |
76 | if (seedf != INVALID_HANDLE_VALUE) { |
374330e2 |
77 | while (1) { |
78 | char buf[1024]; |
79 | DWORD len; |
80 | |
81 | if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len) |
82 | func(buf, len); |
83 | else |
84 | break; |
85 | } |
86 | CloseHandle(seedf); |
87 | } |
88 | } |
89 | |
90 | void random_save_seed(void) { |
91 | HANDLE seedf; |
92 | |
93 | if (!seedpath[0]) |
94 | get_seedpath(); |
95 | |
96 | seedf = CreateFile(seedpath, GENERIC_WRITE, 0, |
97 | NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); |
98 | |
c1f5f956 |
99 | if (seedf != INVALID_HANDLE_VALUE) { |
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100 | int len; |
101 | DWORD lenwritten; |
102 | void *data; |
103 | |
104 | random_get_savedata(&data, &len); |
105 | WriteFile(seedf, data, len, &lenwritten, NULL); |
106 | CloseHandle(seedf); |
107 | } |
108 | } |
109 | |
110 | /* |
111 | * This function is called every time the random pool needs |
112 | * stirring, and will acquire the system time in all available |
113 | * forms and the battery status. |
114 | */ |
115 | void noise_get_light(void (*func) (void *, int)) { |
116 | SYSTEMTIME systime; |
117 | DWORD adjust[2]; |
118 | BOOL rubbish; |
119 | SYSTEM_POWER_STATUS pwrstat; |
120 | |
121 | GetSystemTime(&systime); |
122 | func(&systime, sizeof(systime)); |
123 | |
124 | GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish); |
125 | func(&adjust, sizeof(adjust)); |
126 | |
676c0556 |
127 | #ifndef WIN32S_COMPAT |
374330e2 |
128 | if (GetSystemPowerStatus(&pwrstat)) |
129 | func(&pwrstat, sizeof(pwrstat)); |
676c0556 |
130 | #endif |
374330e2 |
131 | } |
132 | |
133 | /* |
134 | * This function is called on every keypress or mouse move, and |
135 | * will add the current Windows time and performance monitor |
136 | * counter to the noise pool. It gets the scan code or mouse |
137 | * position passed in. |
138 | */ |
139 | void noise_ultralight(DWORD data) { |
140 | DWORD wintime; |
141 | LARGE_INTEGER perftime; |
142 | |
143 | random_add_noise(&data, sizeof(DWORD)); |
144 | |
145 | wintime = GetTickCount(); |
146 | random_add_noise(&wintime, sizeof(DWORD)); |
147 | |
148 | if (QueryPerformanceCounter(&perftime)) |
149 | random_add_noise(&perftime, sizeof(perftime)); |
150 | } |