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Fix a read of uninitialized memory in next_token() of hba.c, spotted via
valgrind: a buffer passed to strncmp() had to be NUL-terminated. Original report and patch from Dennis Bjorkland, some cleanup by Andrew Dunstan, and finally some editorializing from Neil Conway.
This commit is contained in:
Neil Conway
parent
4c29e21578
commit
9e218af7ed
@ -10,7 +10,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.119 2003/12/25 03:44:04 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.120 2004/02/02 16:58:30 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -37,12 +37,23 @@
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#include "storage/fd.h"
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#define IDENT_USERNAME_MAX 512
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/* Max size of username ident server can return */
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#define IDENT_USERNAME_MAX 512
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/* Standard TCP port number for Ident service. Assigned by IANA */
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#define IDENT_PORT 113
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/* Name of the config file */
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#define CONF_FILE "pg_hba.conf"
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/* Name of the usermap file */
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#define USERMAP_FILE "pg_ident.conf"
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/* This is used to separate values in multi-valued column strings */
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#define MULTI_VALUE_SEP "\001"
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#define MAX_TOKEN 256
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/*
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* These variables hold the pre-parsed contents of the hba and ident
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* configuration files. Each is a list of sublists, one sublist for
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@ -80,19 +91,19 @@ pg_isblank(const char c)
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/*
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* Grab one token out of fp. Tokens are strings of non-blank
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* characters bounded by blank characters, beginning of line, and
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* end of line. Blank means space or tab. Return the token as
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* *buf. Leave file positioned to character immediately after the
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* token or EOF, whichever comes first. If no more tokens on line,
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* return null string as *buf and position file to beginning of
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* next line or EOF, whichever comes first. Allow spaces in quoted
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* strings. Terminate on unquoted commas. Handle comments. Treat
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* unquoted keywords that might be user names or database names
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* specially, by appending a newline to them.
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* Grab one token out of fp. Tokens are strings of non-blank
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* characters bounded by blank characters, beginning of line, and
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* end of line. Blank means space or tab. Return the token as
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* *buf. Leave file positioned at the character immediately after the
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* token or EOF, whichever comes first. If no more tokens on line,
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* return empty string as *buf and position the file to the beginning
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* of the next line or EOF, whichever comes first. Allow spaces in
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* quoted strings. Terminate on unquoted commas. Handle
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* comments. Treat unquoted keywords that might be user names or
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* database names specially, by appending a newline to them.
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*/
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void
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next_token(FILE *fp, char *buf, const int bufsz)
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static void
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next_token(FILE *fp, char *buf, int bufsz)
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{
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int c;
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char *start_buf = buf;
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@ -101,88 +112,89 @@ next_token(FILE *fp, char *buf, const int bufsz)
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bool was_quote = false;
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bool saw_quote = false;
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Assert(end_buf > start_buf);
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/* Move over initial whitespace and commas */
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while ((c = getc(fp)) != EOF && (pg_isblank(c) || c == ','))
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;
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if (c != EOF && c != '\n')
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if (c == EOF || c == '\n')
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{
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/*
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* Build a token in buf of next characters up to EOF, EOL,
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* unquoted comma, or unquoted whitespace.
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*/
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while (c != EOF && c != '\n' &&
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(!pg_isblank(c) || in_quote == true))
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*buf = '\0';
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return;
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}
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/*
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* Build a token in buf of next characters up to EOF, EOL,
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* unquoted comma, or unquoted whitespace.
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*/
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while (c != EOF && c != '\n' &&
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(!pg_isblank(c) || in_quote == true))
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{
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/* skip comments to EOL */
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if (c == '#' && !in_quote)
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{
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/* skip comments to EOL */
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if (c == '#' && !in_quote)
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{
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while ((c = getc(fp)) != EOF && c != '\n')
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;
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/* If only comment, consume EOL too; return EOL */
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if (c != EOF && buf == start_buf)
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c = getc(fp);
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break;
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}
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if (buf >= end_buf)
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{
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ereport(LOG,
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(errcode(ERRCODE_CONFIG_FILE_ERROR),
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errmsg("authentication file token too long, skipping: \"%s\"",
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buf)));
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/* Discard remainder of line */
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while ((c = getc(fp)) != EOF && c != '\n')
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;
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buf[0] = '\0';
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break;
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}
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if (c != '"' || (c == '"' && was_quote))
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*buf++ = c;
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/* We pass back the comma so the caller knows there is more */
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if ((pg_isblank(c) || c == ',') && !in_quote)
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break;
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/* Literal double-quote is two double-quotes */
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if (in_quote && c == '"')
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was_quote = !was_quote;
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else
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was_quote = false;
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if (c == '"')
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{
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in_quote = !in_quote;
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saw_quote = true;
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}
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c = getc(fp);
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while ((c = getc(fp)) != EOF && c != '\n')
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;
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/* If only comment, consume EOL too; return EOL */
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if (c != EOF && buf == start_buf)
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c = getc(fp);
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break;
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}
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/*
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* Put back the char right after the token (critical in case it is
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* EOL, since we need to detect end-of-line at next call).
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*/
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if (c != EOF)
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ungetc(c, fp);
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if (buf >= end_buf)
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{
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ereport(LOG,
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(errcode(ERRCODE_CONFIG_FILE_ERROR),
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errmsg("authentication file token too long, skipping: \"%s\"",
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buf)));
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/* Discard remainder of line */
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while ((c = getc(fp)) != EOF && c != '\n')
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;
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buf[0] = '\0';
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break;
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}
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if (c != '"' || (c == '"' && was_quote))
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*buf++ = c;
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/* We pass back the comma so the caller knows there is more */
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if ((pg_isblank(c) || c == ',') && !in_quote)
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break;
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/* Literal double-quote is two double-quotes */
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if (in_quote && c == '"')
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was_quote = !was_quote;
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else
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was_quote = false;
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if (c == '"')
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{
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in_quote = !in_quote;
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saw_quote = true;
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}
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c = getc(fp);
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}
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if ( !saw_quote &&
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(
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strncmp(start_buf,"all",3) == 0 ||
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strncmp(start_buf,"sameuser",8) == 0 ||
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strncmp(start_buf,"samegroup",9) == 0
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)
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)
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{
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/* append newline to a magical keyword */
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*buf++ = '\n';
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}
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/*
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* Put back the char right after the token (critical in case it is
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* EOL, since we need to detect end-of-line at next call).
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*/
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if (c != EOF)
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ungetc(c, fp);
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*buf = '\0';
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if (!saw_quote &&
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(strcmp(start_buf, "all") == 0 ||
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strcmp(start_buf, "sameuser") == 0 ||
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strcmp(start_buf, "samegroup") == 0))
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{
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/* append newline to a magical keyword */
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*buf++ = '\n';
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*buf = '\0';
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}
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}
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/*
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@ -4,7 +4,7 @@
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* Interface to hba.c
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*
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*
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* $PostgreSQL: pgsql/src/include/libpq/hba.h,v 1.34 2003/11/29 22:41:03 pgsql Exp $
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* $PostgreSQL: pgsql/src/include/libpq/hba.h,v 1.35 2004/02/02 16:58:30 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -17,15 +17,6 @@
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#include "nodes/pg_list.h"
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#define CONF_FILE "pg_hba.conf"
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/* Name of the config file */
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#define USERMAP_FILE "pg_ident.conf"
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/* Name of the usermap file */
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#define IDENT_PORT 113
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/* Standard TCP port number for Ident service. Assigned by IANA */
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typedef enum UserAuth
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{
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uaReject,
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@ -43,9 +34,6 @@ typedef enum UserAuth
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typedef struct Port hbaPort;
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#define MAX_TOKEN 256
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extern void next_token(FILE *fp, char *buf, const int bufsz);
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extern List **get_user_line(const char *user);
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extern void load_hba(void);
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extern void load_ident(void);
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