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我正在尝试将用户添加到 Berkeley db 数据库中以进行 vsftpd 的 PAM 身份验证。该数据库最初是由 db_load 实用程序从用户名和密码的文本文件创建的。

db_load -T -t hash -f vusers.txt vsftpd-virtual-user.db

这些用户的 PAM 身份验证工作正常。我编写了将用户添加到该数据库的 c++ 应用程序。

  int ret = -1;
  char *description = "user5";
  char *pass = "password5";

// Database open omitted for clarity
  Dbt data(pass, strlen(pass) + 1);
  Dbt key(description, strlen(description) + 1);

  ret = db.put(NULL, &key, &data, DB_NOOVERWRITE);

操作成功通过,但 PAM 无法识别新添加的用户。我检查了数据库的内容,发现最初添加的数据与我的应用程序添加的数据不同:它包含一些在用户名和密码后面尾随的二进制数据。PAM db 数据格式是什么?如何解决问题?

这是添加新主菜之前的 db_dump 输出

bash-4.2$ db_dump -d a /etc/vsftpd_virtual-users.db
In-memory DB structure:
hash: 0x90000 (open called, read-only)
meta_pgno: 0
h_ffactor: 0
h_nelem: 2
h_hash: 0xb770bb00
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
page 0: hash metadata: LSN [0][1]: level 0
        magic: 0x61561
        version: 9
        pagesize: 4096
        type: 8
        metaflags 0
        keys: 0 records: 0
        free list: 0
        last_pgno: 2
        flags: 0
        uid: d 0 8e 0 7 8 0 0 9d 2b 10 be 8a 11 0 0 0 0 0 0
        max_bucket: 1
        high_mask: 0x1
        low_mask:  0
        ffactor: 0
        nelem: 2
        h_charkey: 0x5e688dd1
        spare points: 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
page 1: hash: LSN [0][1]: level 0
        prev:    0 next:    0 entries:    2 offset: 4085
        [000] 4091 len:   4 data: usr2
        [001] 4085 len:   5 data: pass2
page 2: hash: LSN [0][1]: level 0
        prev:    0 next:    0 entries:    2 offset: 4085
        [000] 4091 len:   4 data: usr1
        [001] 4085 len:   5 data: pass1

在添加了“user5”和“pass5”的新主菜之后

bash-4.2$ db_dump -d a 1vsftpd_virtual-users.db 
In-memory DB structure:
hash: 0x90000 (open called, read-only)
meta_pgno: 0
h_ffactor: 0
h_nelem: 3
h_hash: 0xb7675b00
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
page 0: hash metadata: LSN [0][1]: level 0
        magic: 0x61561
        version: 9
        pagesize: 4096
        type: 8
        metaflags 0
        keys: 0 records: 0
        free list: 0
        last_pgno: 2
        flags: 0
        uid: d 0 8e 0 7 8 0 0 9d 2b 10 be 8a 11 0 0 0 0 0 0
        max_bucket: 1
        high_mask: 0x1
        low_mask:  0
        ffactor: 0
        nelem: 3
        h_charkey: 0x5e688dd1
        spare points: 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
page 1: hash: LSN [0][1]: level 0
        prev:    0 next:    0 entries:    2 offset: 4085
        [000] 4091 len:   4 data: usr2
        [001] 4085 len:   5 data: pass2
page 2: hash: LSN [0][1]: level 0
        prev:    0 next:    0 entries:    4 offset: 4072
        [000] 4091 len:   4 data: usr1
        [001] 4085 len:   5 data: pass1
        [002] 4079 len:   5 data: 0x750x730x720x3500
        [003] 4072 len:   6 data: 0x700x610x730x730x3500
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