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
|
// Include Files /*{{{*/
#include <config.h>
#include <apt-pkg/acquire.h>
#include <apt-pkg/acquire-item.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/strutl.h>
#include <apt-private/private-output.h>
#include <apt-private/private-download.h>
#include <fstream>
#include <string>
#include <vector>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <fcntl.h>
#include <sys/vfs.h>
#include <sys/statvfs.h>
#include <errno.h>
#include <apti18n.h>
/*}}}*/
bool CheckDropPrivsMustBeDisabled(pkgAcquire &Fetcher) /*{{{*/
{
// no need/possibility to drop privs
if(getuid() != 0)
return true;
// the user does not want to drop privs
std::string SandboxUser = _config->Find("APT::Sandbox::User");
if (SandboxUser.empty())
return true;
struct passwd const * const pw = getpwnam(SandboxUser.c_str());
if (pw == NULL)
return true;
if (seteuid(pw->pw_uid) != 0)
return _error->Errno("seteuid", "seteuid %u failed", pw->pw_uid);
bool res = true;
// check if we can write to destfile
for (pkgAcquire::ItemIterator I = Fetcher.ItemsBegin();
I != Fetcher.ItemsEnd() && res == true; ++I)
{
if ((*I)->DestFile.empty())
continue;
// we assume that an existing (partial) file means that we have sufficient rights
if (RealFileExists((*I)->DestFile))
continue;
int fd = open((*I)->DestFile.c_str(), O_CREAT | O_EXCL | O_RDWR, 0600);
if (fd < 0)
{
res = false;
std::string msg;
strprintf(msg, _("Can't drop privileges for downloading as file '%s' couldn't be accessed by user '%s'."),
(*I)->DestFile.c_str(), SandboxUser.c_str());
std::cerr << "W: " << msg << std::endl;
_config->Set("APT::Sandbox::User", "");
break;
}
unlink((*I)->DestFile.c_str());
close(fd);
}
if (seteuid(0) != 0)
return _error->Errno("seteuid", "seteuid %u failed", 0);
return res;
}
/*}}}*/
// CheckAuth - check if each download comes form a trusted source /*{{{*/
bool CheckAuth(pkgAcquire& Fetcher, bool const PromptUser)
{
std::vector<std::string> UntrustedList;
for (pkgAcquire::ItemIterator I = Fetcher.ItemsBegin(); I < Fetcher.ItemsEnd(); ++I)
if (!(*I)->IsTrusted())
UntrustedList.push_back((*I)->ShortDesc());
if (UntrustedList.empty())
return true;
return AuthPrompt(UntrustedList, PromptUser);
}
bool AuthPrompt(std::vector<std::string> const &UntrustedList, bool const PromptUser)
{
ShowList(c2out,_("WARNING: The following packages cannot be authenticated!"), UntrustedList,
[](std::string const&) { return true; },
[](std::string const&str) { return str; },
[](std::string const&) { return ""; });
if (_config->FindB("APT::Get::AllowUnauthenticated",false) == true)
{
c2out << _("Authentication warning overridden.\n");
return true;
}
if (PromptUser == false)
return _error->Error(_("Some packages could not be authenticated"));
if (_config->FindI("quiet",0) < 2
&& _config->FindB("APT::Get::Assume-Yes",false) == false)
{
c2out << _("Install these packages without verification?") << std::flush;
if (!YnPrompt(false))
return _error->Error(_("Some packages could not be authenticated"));
return true;
}
else if (_config->FindB("APT::Get::Force-Yes",false) == true)
return true;
return _error->Error(_("There are problems and -y was used without --force-yes"));
}
/*}}}*/
bool AcquireRun(pkgAcquire &Fetcher, int const PulseInterval, bool * const Failure, bool * const TransientNetworkFailure)/*{{{*/
{
pkgAcquire::RunResult res;
if(PulseInterval > 0)
res = Fetcher.Run(PulseInterval);
else
res = Fetcher.Run();
if (res == pkgAcquire::Failed)
return false;
for (pkgAcquire::ItemIterator I = Fetcher.ItemsBegin();
I != Fetcher.ItemsEnd(); ++I)
{
if ((*I)->Status == pkgAcquire::Item::StatDone &&
(*I)->Complete == true)
continue;
if (TransientNetworkFailure != NULL && (*I)->Status == pkgAcquire::Item::StatIdle)
{
*TransientNetworkFailure = true;
continue;
}
::URI uri((*I)->DescURI());
uri.User.clear();
uri.Password.clear();
std::string descUri = std::string(uri);
_error->Error(_("Failed to fetch %s %s\n"), descUri.c_str(),
(*I)->ErrorText.c_str());
if (Failure != NULL)
*Failure = true;
}
return true;
}
/*}}}*/
bool CheckFreeSpaceBeforeDownload(std::string const &Dir, unsigned long long FetchBytes)/*{{{*/
{
uint32_t const RAMFS_MAGIC = 0x858458f6;
/* Check for enough free space, but only if we are actually going to
download */
if (_config->FindB("APT::Get::Print-URIs", false) == true ||
_config->FindB("APT::Get::Download", true) == false)
return true;
struct statvfs Buf;
if (statvfs(Dir.c_str(),&Buf) != 0) {
if (errno == EOVERFLOW)
return _error->WarningE("statvfs",_("Couldn't determine free space in %s"),
Dir.c_str());
else
return _error->Errno("statvfs",_("Couldn't determine free space in %s"),
Dir.c_str());
}
else
{
unsigned long long const FreeBlocks = _config->Find("APT::Sandbox::User").empty() ? Buf.f_bfree : Buf.f_bavail;
if (FreeBlocks < (FetchBytes / Buf.f_bsize))
{
struct statfs Stat;
if (statfs(Dir.c_str(),&Stat) != 0
#if HAVE_STRUCT_STATFS_F_TYPE
|| Stat.f_type != RAMFS_MAGIC
#endif
)
return _error->Error(_("You don't have enough free space in %s."),
Dir.c_str());
}
}
return true;
}
/*}}}*/
|
