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
|
#include "crypto.hh"
#include "globals.hh"
#include "nar-info.hh"
namespace nix {
NarInfo::NarInfo(const std::string & s, const std::string & whence)
{
auto corrupt = [&]() {
throw Error("NAR info file ‘%1%’ is corrupt");
};
auto parseHashField = [&](const string & s) {
string::size_type colon = s.find(':');
if (colon == string::npos) corrupt();
HashType ht = parseHashType(string(s, 0, colon));
if (ht == htUnknown) corrupt();
return parseHash16or32(ht, string(s, colon + 1));
};
size_t pos = 0;
while (pos < s.size()) {
size_t colon = s.find(':', pos);
if (colon == std::string::npos) corrupt();
std::string name(s, pos, colon - pos);
size_t eol = s.find('\n', colon + 2);
if (eol == std::string::npos) corrupt();
std::string value(s, colon + 2, eol - colon - 2);
if (name == "StorePath") {
if (!isStorePath(value)) corrupt();
path = value;
}
else if (name == "URL")
url = value;
else if (name == "Compression")
compression = value;
else if (name == "FileHash")
fileHash = parseHashField(value);
else if (name == "FileSize") {
if (!string2Int(value, fileSize)) corrupt();
}
else if (name == "NarHash")
narHash = parseHashField(value);
else if (name == "NarSize") {
if (!string2Int(value, narSize)) corrupt();
}
else if (name == "References") {
auto refs = tokenizeString<Strings>(value, " ");
if (!references.empty()) corrupt();
for (auto & r : refs) {
auto r2 = settings.nixStore + "/" + r;
if (!isStorePath(r2)) corrupt();
references.insert(r2);
}
}
else if (name == "Deriver") {
auto p = settings.nixStore + "/" + value;
if (!isStorePath(p)) corrupt();
deriver = p;
}
else if (name == "System")
system = value;
else if (name == "Sig")
sig = value;
pos = eol + 1;
}
if (compression == "") compression = "bzip2";
if (path.empty() || url.empty()) corrupt();
}
std::string NarInfo::to_string() const
{
std::string res;
res += "StorePath: " + path + "\n";
res += "URL: " + url + "\n";
assert(compression != "");
res += "Compression: " + compression + "\n";
assert(fileHash.type == htSHA256);
res += "FileHash: sha256:" + printHash32(fileHash) + "\n";
res += "FileSize: " + std::to_string(fileSize) + "\n";
assert(narHash.type == htSHA256);
res += "NarHash: sha256:" + printHash32(narHash) + "\n";
res += "NarSize: " + std::to_string(narSize) + "\n";
res += "References: " + concatStringsSep(" ", shortRefs()) + "\n";
if (!deriver.empty())
res += "Deriver: " + baseNameOf(deriver) + "\n";
if (!system.empty())
res += "System: " + system + "\n";
if (!sig.empty())
res += "Sig: " + sig + "\n";
return res;
}
std::string NarInfo::fingerprint() const
{
return
"1;" + path + ";"
+ printHashType(narHash.type) + ":" + printHash32(narHash) + ";"
+ std::to_string(narSize) + ";"
+ concatStringsSep(",", references);
}
Strings NarInfo::shortRefs() const
{
Strings refs;
for (auto & r : references)
refs.push_back(baseNameOf(r));
return refs;
}
void NarInfo::sign(const SecretKey & secretKey)
{
sig = secretKey.signDetached(fingerprint());
}
bool NarInfo::checkSignature(const PublicKeys & publicKeys) const
{
return sig != "" && verifyDetached(fingerprint(), sig, publicKeys);
}
}
|
