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
|
#include "lix/libexpr/flake/flake.hh"
#include "lix/libutil/fmt.hh"
#include "lix/libutil/logging.hh"
#include "lix/libutil/json.hh"
#include "lix/libutil/users.hh"
#include "lix/libfetchers/fetch-settings.hh"
namespace nix::flake {
// setting name -> setting value -> allow or ignore.
typedef std::map<std::string, std::map<std::string, bool>> TrustedList;
Path trustedListPath()
{
return getDataDir() + "/nix/trusted-settings.json";
}
static TrustedList readTrustedList()
{
auto path = trustedListPath();
if (!pathExists(path)) return {};
auto json = json::parse(readFile(path), "trusted flake settings");
return json;
}
static void writeTrustedList(const TrustedList & trustedList)
{
auto path = trustedListPath();
createDirs(dirOf(path));
writeFile(path, JSON(trustedList).dump());
}
static bool batchAskForSetting(
bool & negativeTrustOverride,
TrustedList & trustedList,
std::map<std::string, std::string> & untrustedSettings)
{
std::string warning("The following settings require your decision:");
for (const auto & [name, valueS] : untrustedSettings) {
// FIXME: filter ANSI escapes, newlines, \r, etc.
warning += fmt("\n- %s = %s", name, valueS);
}
printWarning("%s", warning);
auto reply = logger
->ask(
fmt("Do you want to allow configuration settings to be applied?\nThis may allow the "
"flake to gain root, see the nix.conf manual page (" ANSI_BOLD "y" ANSI_NORMAL
"es for now/" ANSI_BOLD "A" ANSI_NORMAL "llow always/" ANSI_BOLD "n" ANSI_NORMAL
"o/" ANSI_BOLD "N" ANSI_NORMAL "o to all) ")
)
.value_or('n');
if (reply == 'N') {
printWarning("Rejecting all untrusted nix.conf entries");
printTaggedWarning(
"you can set '%s' to '%b' to automatically reject configuration options supplied by "
"flakes",
"accept-flake-config",
false
);
negativeTrustOverride = true;
return false;
}
if (reply == 'y' || reply == 'A') {
auto alwaysAllow = reply == 'A';
for (const auto & [name, valueS] : untrustedSettings) {
if (alwaysAllow) {
trustedList[name][valueS] = true;
}
globalConfig.set(name, valueS);
}
if (alwaysAllow) {
writeTrustedList(trustedList);
}
return true;
} else {
printTaggedWarning(
"you can set '%s' to '%b' to automatically reject configuration options supplied "
"by flakes",
"accept-flake-config",
false
);
}
auto didTrustedListChange = false;
for (const auto & [name, valueS] : untrustedSettings) {
auto individualReply = logger
->ask(
fmt("Do you want to allow setting '%s = %s'? (" ANSI_BOLD
"y" ANSI_NORMAL "es for now/" ANSI_BOLD "A" ANSI_NORMAL
"llow always/" ANSI_BOLD "n" ANSI_NORMAL "o for now) ",
name,
valueS)
)
.value_or('n');
if (individualReply == 'y' || individualReply == 'A') {
if (individualReply == 'A') {
trustedList[name][valueS] = true;
didTrustedListChange = true;
}
globalConfig.set(name, valueS);
}
}
if (didTrustedListChange) {
writeTrustedList(trustedList);
}
return false;
}
void ConfigFile::apply()
{
std::set<std::string> whitelist{"bash-prompt", "bash-prompt-prefix", "bash-prompt-suffix", "flake-registry", "commit-lockfile-summary"};
// Allows to ignore all subsequent settings from this file.
bool negativeTrustOverride = false;
std::map<std::string, std::string> untrustedSettings;
TrustedList trustedList = readTrustedList();
for (auto & [name, value] : settings) {
auto baseName = name.starts_with("extra-") ? std::string(name, 6) : name;
// FIXME: Move into libutil/config.cc.
std::string valueS;
if (auto* s = std::get_if<std::string>(&value))
valueS = *s;
else if (auto* n = std::get_if<int64_t>(&value))
valueS = fmt("%d", *n);
else if (auto* b = std::get_if<Explicit<bool>>(&value))
valueS = b->t ? "true" : "false";
else if (auto ss = std::get_if<std::vector<std::string>>(&value))
valueS = concatStringsSep(" ", *ss); // FIXME: evil
else
assert(false);
bool trusted = whitelist.count(baseName);
if (!trusted) {
switch (nix::fetchSettings.acceptFlakeConfig.get()) {
case AcceptFlakeConfig::True: {
trusted = true;
break;
}
case AcceptFlakeConfig::Ask: {
auto tlname = get(trustedList, name);
if (auto saved = tlname ? get(*tlname, valueS) : nullptr) {
trusted = *saved;
printInfo("Using saved setting for '%s = %s' from ~/.local/share/nix/trusted-settings.json.", name, valueS);
} else {
untrustedSettings[name] = valueS;
}
break;
}
case AcceptFlakeConfig::False: {
trusted = false;
break;
};
}
}
if (trusted) {
debug("accepting trusted flake configuration setting '%s'", name);
globalConfig.set(name, valueS);
} else {
printTaggedWarning(
"ignoring untrusted flake configuration setting '%s', pass '%s' to trust it (may "
"allow the flake to gain root, see the nix.conf manual page)",
name,
"--accept-flake-config"
);
}
}
if (!untrustedSettings.empty()) {
batchAskForSetting(negativeTrustOverride, trustedList, untrustedSettings);
}
}
}
|