summaryrefslogtreecommitdiffhomepage
path: root/src/ldso/pe_get_framework_runtime_data.c
blob: 366e5235e8c4f5cd1675728470a3738ff835c2af (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
/*****************************************************************************/
/*  pemagination: a (virtual) tour into portable bits and executable bytes   */
/*  Copyright (C) 2013--2017  Z. Gilboa                                      */
/*  Released under GPLv2 and GPLv3; see COPYING.PEMAGINE.                    */
/*****************************************************************************/

#include <psxtypes/psxtypes.h>
#include <pemagine/pemagine.h>
#include "pe_os.h"

struct pe_framework_cmdline {
	struct pe_guid_str_utf16	guid;
	wchar16_t			space1;
	wchar16_t			rarg[2];
	wchar16_t			space2;
	wchar16_t			addr[2*__SIZEOF_POINTER__];
	wchar16_t			null;
};

static int32_t pe_hex_utf16_to_uint32(
	const wchar16_t	hex_key_utf16[8],
	uint32_t *	key)
{
	int		i;
	unsigned char	uch[8];
	unsigned char	ubytes[4];
	uint32_t *	key_ret;

	/* input validation */
	for (i=0; i<8; i++)
		if (!((hex_key_utf16[i] >= 'a') && (hex_key_utf16[i] <= 'f')))
			if (!((hex_key_utf16[i] >= 'A') && (hex_key_utf16[i] <= 'F')))
				if (!((hex_key_utf16[i] >= '0') && (hex_key_utf16[i] <= '9')))
					return OS_STATUS_INVALID_PARAMETER;

	/* intermediate step: little endian byte order */
	uch[0] = (unsigned char)hex_key_utf16[6];
	uch[1] = (unsigned char)hex_key_utf16[7];
	uch[2] = (unsigned char)hex_key_utf16[4];
	uch[3] = (unsigned char)hex_key_utf16[5];
	uch[4] = (unsigned char)hex_key_utf16[2];
	uch[5] = (unsigned char)hex_key_utf16[3];
	uch[6] = (unsigned char)hex_key_utf16[0];
	uch[7] = (unsigned char)hex_key_utf16[1];

	for (i=0; i<8; i++) {
		/* 'a' > 'A' > '0' */
		if (uch[i] >= 'a')
			uch[i] -= ('a' - 0x0a);
		else if (uch[i] >= 'A')
			uch[i] -= ('A' - 0x0a);
		else
			uch[i] -= '0';
	}

	ubytes[0] = uch[0] * 0x10 + uch[1];
	ubytes[1] = uch[2] * 0x10 + uch[3];
	ubytes[2] = uch[4] * 0x10 + uch[5];
	ubytes[3] = uch[6] * 0x10 + uch[7];

	key_ret = (uint32_t *)ubytes;
	*key = *key_ret;

	return OS_STATUS_SUCCESS;
}

static int32_t pe_hex_utf16_to_uint16(
	const wchar16_t hex_key_utf16[4],
	uint16_t *	key)
{
	int32_t		status;
	uint32_t	dword_key;
	wchar16_t	hex_buf[8] = {'0','0','0','0'};

	hex_buf[4] = hex_key_utf16[0];
	hex_buf[5] = hex_key_utf16[1];
	hex_buf[6] = hex_key_utf16[2];
	hex_buf[7] = hex_key_utf16[3];

	if ((status = pe_hex_utf16_to_uint32(hex_buf,&dword_key)))
		return status;

	*key = (uint16_t)dword_key;

	return OS_STATUS_SUCCESS;
}

static int32_t pe_hex_utf16_to_uint64(
	const wchar16_t	hex_key_utf16[16],
	uint64_t *	key)
{
	int32_t		status;
	uint32_t	x64_key[2];
	uint64_t *	key_ret;

	if ((status = pe_hex_utf16_to_uint32(
			&hex_key_utf16[0],
			&x64_key[1])))
		return status;

	if ((status = pe_hex_utf16_to_uint32(
			&hex_key_utf16[8],
			&x64_key[0])))
		return status;

	key_ret = (uint64_t *)x64_key;
	*key    = *key_ret;

	return OS_STATUS_SUCCESS;
}


static int32_t pe_hex_utf16_to_uintptr(
	const wchar16_t	hex_key_utf16[],
	uintptr_t *	key)
{
	(void)pe_hex_utf16_to_uint32;
	(void)pe_hex_utf16_to_uint64;

	#if (__SIZEOF_POINTER__ == 4)
		return pe_hex_utf16_to_uint32(hex_key_utf16,key);
	#elif (__SIZEOF_POINTER__ == 8)
		return pe_hex_utf16_to_uint64(hex_key_utf16,key);
	#endif
}

static int32_t pe_string_to_guid_utf16(
	const struct pe_guid_str_utf16 *guid_str,
	struct pe_guid *		guid)
{
	int32_t			status;
	uint16_t		key;
	const wchar16_t *	wch;

	if ((guid_str->lbrace != '{')
			|| (guid_str->rbrace != '}')
			|| (guid_str->dash1 != '-')
			|| (guid_str->dash2 != '-')
			|| (guid_str->dash3 != '-')
			|| (guid_str->dash4 != '-'))
		return OS_STATUS_INVALID_PARAMETER;

	wch = &(guid_str->group5[0]);

	if ((status = pe_hex_utf16_to_uint32(
			guid_str->group1,
			&guid->data1)))
		return status;

	if ((status = pe_hex_utf16_to_uint16(
			guid_str->group2,
			&guid->data2)))
		return status;

	if ((status = pe_hex_utf16_to_uint16(
			guid_str->group3,
			&guid->data3)))
		return status;

	if ((status = pe_hex_utf16_to_uint16(
			guid_str->group4,
			&key)))
		return status;

	guid->data4[0] = key >> 8;
	guid->data4[1] = key % 0x100;

	if ((status = pe_hex_utf16_to_uint16(
			&(wch[0]),
			&key)))
		return status;

	guid->data4[2] = key >> 8;
	guid->data4[3] = key % 0x100;

	if ((status = pe_hex_utf16_to_uint16(
			&(wch[4]),
			&key)))
		return status;

	guid->data4[4] = key >> 8;
	guid->data4[5] = key % 0x100;

	if ((status = pe_hex_utf16_to_uint16(
			&(wch[8]),
			&key)))
		return status;

	guid->data4[6] = key >> 8;
	guid->data4[7] = key % 0x100;

	return OS_STATUS_SUCCESS;
}

static int32_t pe_guid_compare(
	const struct pe_guid *	pguid_dst,
	const struct pe_guid *	pguid_src)
{
	const uint32_t *	dst;
	const uint32_t *	src;

	dst = &pguid_dst->data1;
	src = &pguid_src->data1;

	if ((dst[0] == src[0])
			&& (dst[1] == src[1])
			&& (dst[2] == src[2])
			&& (dst[3] == src[3]))
		return OS_STATUS_SUCCESS;

	return OS_STATUS_NO_MATCH;
}

int32_t pe_get_framework_runtime_data(
	struct pe_framework_runtime_data **	rtdata,
	const wchar16_t *			cmdline,
	const struct pe_guid *			abi)
{
	int32_t					status;
	struct pe_framework_runtime_data *	prtdata;
	struct pe_framework_cmdline *		fcmdline;
	struct pe_guid				guid;
	uintptr_t				address;
	uintptr_t				buffer;
	void *					hntdll;
	os_zw_read_virtual_memory *		zw_read_virtual_memory;

	/* init */
	if (!(hntdll = pe_get_ntdll_module_handle()))
		return OS_STATUS_INTERNAL_ERROR;

	if (!(zw_read_virtual_memory = (os_zw_read_virtual_memory *)pe_get_procedure_address(
			hntdll,"ZwReadVirtualMemory")))
		return OS_STATUS_INTERNAL_ERROR;

	/* framework cmdline */
	if (!(fcmdline = (struct pe_framework_cmdline *)cmdline))
		return OS_STATUS_INVALID_PARAMETER;

	/* framework cmdline: conformance */
	if (fcmdline->null)
		return OS_STATUS_INVALID_PARAMETER;

	/* framework cmdline: rarg */
	if ((fcmdline->space1 != ' ')
			|| (fcmdline->space2  != ' ')
			|| (fcmdline->rarg[0] != '-')
			|| (fcmdline->rarg[1] != 'r'))
		return OS_STATUS_INVALID_PARAMETER;

	/* framework cmdline: address */
	if ((status = pe_hex_utf16_to_uintptr(
			fcmdline->addr,
			&address)))
		return status;

	/* framework cmdline: guid */
	if ((status = pe_string_to_guid_utf16(
			&fcmdline->guid,
			&guid)))
		return status;

	/* framework cmdline: abi */
	if ((status = pe_guid_compare(&guid,abi)))
		return status;

	/* address: alignment */
	if (address & 0xFFF)
		return OS_STATUS_INVALID_ADDRESS;

	/* address is aligned at page boundary */
	if ((status = zw_read_virtual_memory(
			OS_CURRENT_PROCESS_HANDLE,
			(void *)address,
			(char *)&buffer,
			sizeof(buffer),
			0)))
		return status;

	/* rtdata */
	prtdata = (struct pe_framework_runtime_data *)address;

	/* rtdata: abi */
	if (pe_guid_compare(&prtdata->abi,abi))
		return OS_STATUS_CONTEXT_MISMATCH;

	/* yay */
	*rtdata = prtdata;

	return OS_STATUS_SUCCESS;
}