user.c
3.83 KB
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
/* GNU mailutils - a suite of utilities for electronic mail
Copyright (C) 1999, 2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "pop3d.h"
int
pop3d_user (const char *arg)
{
char *buf, pass[POP_MAXCMDLEN], *tmp, *cmd;
int status;
int lockit = 1;
struct mu_auth_data *auth_data;
if (state != AUTHORIZATION)
return ERR_WRONG_STATE;
if ((strlen (arg) == 0) || (strchr (arg, ' ') != NULL))
return ERR_BAD_ARGS;
pop3d_outf ("+OK\r\n");
fflush (ofile);
buf = pop3d_readline (ifile);
cmd = pop3d_cmd (buf);
tmp = pop3d_args (buf);
if (strlen (tmp) > POP_MAXCMDLEN)
{
free (cmd);
free (tmp);
return ERR_TOO_LONG;
}
else
{
strncpy (pass, tmp, POP_MAXCMDLEN);
/* strncpy () is lame, make sure the string is null terminated. */
pass[POP_MAXCMDLEN - 1] = '\0';
free (tmp);
}
if (strcasecmp (cmd, "PASS") == 0)
{
int rc;
free (cmd);
#ifdef _USE_APOP
/* Check to see if they have an APOP password. If so, refuse USER/PASS */
tmp = pop3d_apopuser (arg);
if (tmp != NULL)
{
syslog (LOG_INFO, "APOP user %s tried to log in with USER", arg);
free (tmp);
return ERR_BAD_LOGIN;
}
#endif
auth_data = mu_get_auth_by_name (arg);
if (auth_data == NULL)
{
syslog (LOG_INFO, "User '%s': nonexistent", arg);
return ERR_BAD_LOGIN;
}
rc = mu_authenticate (auth_data, pass);
openlog ("gnu-pop3d", LOG_PID, log_facility);
if (rc)
{
syslog (LOG_INFO, "User '%s': authentication failed", arg);
mu_auth_data_free (auth_data);
return ERR_BAD_LOGIN;
}
}
else if (strcasecmp (cmd, "QUIT") == 0)
{
syslog (LOG_INFO, "Possible probe of account '%s'", arg);
free (cmd);
return pop3d_quit (pass);
}
else
{
free (cmd);
return ERR_BAD_CMD;
}
if (auth_data->change_uid)
setuid (auth_data->uid);
if ((status = mailbox_create (&mbox, auth_data->mailbox)) != 0
|| (status = mailbox_open (mbox, MU_STREAM_RDWR)) != 0)
{
mailbox_destroy (&mbox);
/* For non existent mailbox, we fake. */
if (status == ENOENT)
{
if (mailbox_create (&mbox, "/dev/null") != 0
|| mailbox_open (mbox, MU_STREAM_READ) != 0)
{
state = AUTHORIZATION;
mu_auth_data_free (auth_data);
return ERR_UNKNOWN;
}
}
else
{
state = AUTHORIZATION;
mu_auth_data_free (auth_data);
return ERR_MBOX_LOCK;
}
lockit = 0; /* Do not attempt to lock /dev/null ! */
}
if (lockit && pop3d_lock ())
{
mailbox_close (mbox);
mailbox_destroy (&mbox);
mu_auth_data_free (auth_data);
state = AUTHORIZATION;
return ERR_MBOX_LOCK;
}
username = strdup (auth_data->name);
if (username == NULL)
pop3d_abquit (ERR_NO_MEM);
state = TRANSACTION;
mu_auth_data_free (auth_data);
pop3d_outf ("+OK opened mailbox for %s\r\n", username);
/* mailbox name */
{
url_t url = NULL;
size_t total = 0;
mailbox_get_url (mbox, &url);
mailbox_messages_count (mbox, &total);
syslog (LOG_INFO, "User '%s' logged in with mailbox '%s' (%d msgs)",
username, url_to_string (url), total);
}
return OK;
}