summaryrefslogtreecommitdiffstats
path: root/src/providers/krb5/krb5_utils.c
blob: 489030af8f9e4adcaccbfbcab2f87eac92a63b80 (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
/*
    SSSD

    Kerberos 5 Backend Module -- Utilities

    Authors:
        Sumit Bose <sbose@redhat.com>

    Copyright (C) 2009 Red Hat

    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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stdlib.h>

#include "providers/krb5/krb5_utils.h"
#include "providers/krb5/krb5_auth.h"
#include "util/util.h"

char *expand_ccname_template(TALLOC_CTX *mem_ctx, struct krb5child_req *kr,
                             const char *template)
{
    char *copy;
    char *p;
    char *n;
    char *result = NULL;
    const char *dummy;

    if (template == NULL) {
        DEBUG(1, ("Missing template.\n"));
        return NULL;
    }

    copy = talloc_strdup(mem_ctx, template);
    if (copy == NULL) {
        DEBUG(1, ("talloc_strdup failed.\n"));
        return NULL;
    }

    result = talloc_strdup(mem_ctx, "");
    if (result == NULL) {
        DEBUG(1, ("talloc_strdup failed.\n"));
        return NULL;
    }

    p = copy;
    while ( (n = strchr(p, '%')) != NULL) {
        *n = '\0';
        n++;
        if ( *n == '\0' ) {
            DEBUG(1, ("format error, single %% at the end of the template.\n"));
            return NULL;
        }

        switch( *n ) {
            case 'u':
                if (kr->pd->user == NULL) {
                    DEBUG(1, ("Cannot expand user name template "
                              "because user name is empty.\n"));
                    return NULL;
                }
                result = talloc_asprintf_append(result, "%s%s", p,
                                                kr->pd->user);
                break;
            case 'U':
                if (kr->pd->pw_uid <= 0) {
                    DEBUG(1, ("Cannot expand uid template "
                              "because uid is invalid.\n"));
                    return NULL;
                }
                result = talloc_asprintf_append(result, "%s%d", p,
                                                kr->pd->pw_uid);
                break;
            case 'p':
                if (kr->pd->upn == NULL) {
                    DEBUG(1, ("Cannot expand user principle name template "
                              "because upn is empty.\n"));
                    return NULL;
                }
                result = talloc_asprintf_append(result, "%s%s", p, kr->pd->upn);
                break;
            case '%':
                result = talloc_asprintf_append(result, "%s%%", p);
                break;
            case 'r':
                dummy = dp_opt_get_string(kr->krb5_ctx->opts, KRB5_REALM);
                if (dummy == NULL) {
                    DEBUG(1, ("Missing kerberos realm.\n"));
                    return NULL;
                }
                result = talloc_asprintf_append(result, "%s%s", p, dummy);
                break;
            case 'h':
                if (kr->homedir == NULL) {
                    DEBUG(1, ("Cannot expand home directory template "
                              "because the path is not available.\n"));
                    return NULL;
                }
                result = talloc_asprintf_append(result, "%s%s", p, kr->homedir);
                break;
            case 'd':
                dummy = dp_opt_get_string(kr->krb5_ctx->opts, KRB5_CCACHEDIR);
                if (dummy == NULL) {
                    DEBUG(1, ("Missing credential cache directory.\n"));
                    return NULL;
                }
                result = talloc_asprintf_append(result, "%s%s", p, dummy);
                break;
            case 'P':
                if (kr->pd->cli_pid == 0) {
                    DEBUG(1, ("Cannot expand PID template "
                              "because PID is not available.\n"));
                    return NULL;
                }
                result = talloc_asprintf_append(result, "%s%d", p,
                                                kr->pd->cli_pid);
                break;
            default:
                DEBUG(1, ("format error, unknown template [%%%c].\n", *n));
                return NULL;
        }

        if (result == NULL) {
            DEBUG(1, ("talloc_asprintf_append failed.\n"));
            return NULL;
        }

        p = n + 1;
    }

    result = talloc_asprintf_append(result, "%s", p);

    return result;
}